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authorJames Morris <jmorris@namei.org>2011-03-08 10:55:06 +1100
committerJames Morris <jmorris@namei.org>2011-03-08 10:55:06 +1100
commit1cc26bada9f6807814806db2f0d78792eecdac71 (patch)
tree5509b5139db04af6c13db0a580c84116a4a54039 /security
parenteae61f3c829439f8f9121b5cd48a14be04df451f (diff)
parent214d93b02c4fe93638ad268613c9702a81ed9192 (diff)
Merge branch 'master'; commit 'v2.6.38-rc7' into next
Diffstat (limited to 'security')
-rw-r--r--security/apparmor/include/file.h3
-rw-r--r--security/apparmor/include/match.h3
-rw-r--r--security/keys/Makefile4
-rw-r--r--security/keys/compat.c17
-rw-r--r--security/keys/encrypted.c (renamed from security/keys/encrypted_defined.c)2
-rw-r--r--security/keys/encrypted.h (renamed from security/keys/encrypted_defined.h)0
-rw-r--r--security/keys/gc.c14
-rw-r--r--security/keys/internal.h32
-rw-r--r--security/keys/key.c328
-rw-r--r--security/keys/keyctl.c355
-rw-r--r--security/keys/keyring.c326
-rw-r--r--security/keys/permission.c33
-rw-r--r--security/keys/proc.c17
-rw-r--r--security/keys/process_keys.c135
-rw-r--r--security/keys/request_key.c166
-rw-r--r--security/keys/request_key_auth.c62
-rw-r--r--security/keys/trusted.c (renamed from security/keys/trusted_defined.c)54
-rw-r--r--security/keys/trusted.h (renamed from security/keys/trusted_defined.h)0
-rw-r--r--security/keys/user_defined.c32
-rw-r--r--security/security.c5
-rw-r--r--security/selinux/hooks.c6
-rw-r--r--security/selinux/include/avc.h1
-rw-r--r--security/selinux/ss/conditional.c2
-rw-r--r--security/selinux/ss/policydb.c4
24 files changed, 930 insertions, 671 deletions
diff --git a/security/apparmor/include/file.h b/security/apparmor/include/file.h
index be36feabb16a..ab8c6d87f758 100644
--- a/security/apparmor/include/file.h
+++ b/security/apparmor/include/file.h
@@ -15,12 +15,11 @@
#ifndef __AA_FILE_H
#define __AA_FILE_H
-#include <linux/path.h>
-
#include "domain.h"
#include "match.h"
struct aa_profile;
+struct path;
/*
* We use MAY_EXEC, MAY_WRITE, MAY_READ, MAY_APPEND and the following flags
diff --git a/security/apparmor/include/match.h b/security/apparmor/include/match.h
index 734a6d35112c..a4a863997bd5 100644
--- a/security/apparmor/include/match.h
+++ b/security/apparmor/include/match.h
@@ -15,6 +15,7 @@
#ifndef __AA_MATCH_H
#define __AA_MATCH_H
+#include <linux/kref.h>
#include <linux/workqueue.h>
#define DFA_NOMATCH 0
@@ -27,7 +28,7 @@
* The format used for transition tables is based on the GNU flex table
* file format (--tables-file option; see Table File Format in the flex
* info pages and the flex sources for documentation). The magic number
- * used in the header is 0x1B5E783D insted of 0xF13C57B1 though, because
+ * used in the header is 0x1B5E783D instead of 0xF13C57B1 though, because
* the YY_ID_CHK (check) and YY_ID_DEF (default) tables are used
* slightly differently (see the apparmor-parser package).
*/
diff --git a/security/keys/Makefile b/security/keys/Makefile
index 6c941050f573..1bf090a885fe 100644
--- a/security/keys/Makefile
+++ b/security/keys/Makefile
@@ -13,8 +13,8 @@ obj-y := \
request_key_auth.o \
user_defined.o
-obj-$(CONFIG_TRUSTED_KEYS) += trusted_defined.o
-obj-$(CONFIG_ENCRYPTED_KEYS) += encrypted_defined.o
+obj-$(CONFIG_TRUSTED_KEYS) += trusted.o
+obj-$(CONFIG_ENCRYPTED_KEYS) += encrypted.o
obj-$(CONFIG_KEYS_COMPAT) += compat.o
obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_SYSCTL) += sysctl.o
diff --git a/security/keys/compat.c b/security/keys/compat.c
index 792c0a611a6d..07a5f35e3970 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -1,4 +1,4 @@
-/* compat.c: 32-bit compatibility syscall for 64-bit systems
+/* 32-bit compatibility syscall for 64-bit systems
*
* Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
@@ -14,13 +14,13 @@
#include <linux/compat.h>
#include "internal.h"
-/*****************************************************************************/
/*
- * the key control system call, 32-bit compatibility version for 64-bit archs
- * - this should only be called if the 64-bit arch uses weird pointers in
- * 32-bit mode or doesn't guarantee that the top 32-bits of the argument
- * registers on taking a 32-bit syscall are zero
- * - if you can, you should call sys_keyctl directly
+ * The key control system call, 32-bit compatibility version for 64-bit archs
+ *
+ * This should only be called if the 64-bit arch uses weird pointers in 32-bit
+ * mode or doesn't guarantee that the top 32-bits of the argument registers on
+ * taking a 32-bit syscall are zero. If you can, you should call sys_keyctl()
+ * directly.
*/
asmlinkage long compat_sys_keyctl(u32 option,
u32 arg2, u32 arg3, u32 arg4, u32 arg5)
@@ -88,5 +88,4 @@ asmlinkage long compat_sys_keyctl(u32 option,
default:
return -EOPNOTSUPP;
}
-
-} /* end compat_sys_keyctl() */
+}
diff --git a/security/keys/encrypted_defined.c b/security/keys/encrypted.c
index 32d27c858388..9e7e4ce3fae8 100644
--- a/security/keys/encrypted_defined.c
+++ b/security/keys/encrypted.c
@@ -30,7 +30,7 @@
#include <crypto/sha.h>
#include <crypto/aes.h>
-#include "encrypted_defined.h"
+#include "encrypted.h"
static const char KEY_TRUSTED_PREFIX[] = "trusted:";
static const char KEY_USER_PREFIX[] = "user:";
diff --git a/security/keys/encrypted_defined.h b/security/keys/encrypted.h
index cef5e2f2b7d1..cef5e2f2b7d1 100644
--- a/security/keys/encrypted_defined.h
+++ b/security/keys/encrypted.h
diff --git a/security/keys/gc.c b/security/keys/gc.c
index a46e825cbf02..89df6b5f203c 100644
--- a/security/keys/gc.c
+++ b/security/keys/gc.c
@@ -32,8 +32,8 @@ static time_t key_gc_next_run = LONG_MAX;
static time_t key_gc_new_timer;
/*
- * Schedule a garbage collection run
- * - precision isn't particularly important
+ * Schedule a garbage collection run.
+ * - time precision isn't particularly important
*/
void key_schedule_gc(time_t gc_at)
{
@@ -61,8 +61,9 @@ static void key_gc_timer_func(unsigned long data)
}
/*
- * Garbage collect pointers from a keyring
- * - return true if we altered the keyring
+ * Garbage collect pointers from a keyring.
+ *
+ * Return true if we altered the keyring.
*/
static bool key_gc_keyring(struct key *keyring, time_t limit)
__releases(key_serial_lock)
@@ -107,9 +108,8 @@ do_gc:
}
/*
- * Garbage collector for keys
- * - this involves scanning the keyrings for dead, expired and revoked keys
- * that have overstayed their welcome
+ * Garbage collector for keys. This involves scanning the keyrings for dead,
+ * expired and revoked keys that have overstayed their welcome
*/
static void key_garbage_collector(struct work_struct *work)
{
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 56a133d8f37d..a52aa7c88b41 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -1,4 +1,4 @@
-/* internal.h: authentication token and access key management internal defs
+/* Authentication token and access key management internal defs
*
* Copyright (C) 2003-5, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
@@ -35,10 +35,12 @@ extern struct key_type key_type_user;
/*****************************************************************************/
/*
- * keep track of keys for a user
- * - this needs to be separate to user_struct to avoid a refcount-loop
- * (user_struct pins some keyrings which pin this struct)
- * - this also keeps track of keys under request from userspace for this UID
+ * Keep track of keys for a user.
+ *
+ * This needs to be separate to user_struct to avoid a refcount-loop
+ * (user_struct pins some keyrings which pin this struct).
+ *
+ * We also keep track of keys under request from userspace for this UID here.
*/
struct key_user {
struct rb_node node;
@@ -62,7 +64,7 @@ extern struct key_user *key_user_lookup(uid_t uid,
extern void key_user_put(struct key_user *user);
/*
- * key quota limits
+ * Key quota limits.
* - root has its own separate limits to everyone else
*/
extern unsigned key_quota_root_maxkeys;
@@ -85,13 +87,13 @@ extern void key_type_put(struct key_type *ktype);
extern int __key_link_begin(struct key *keyring,
const struct key_type *type,
const char *description,
- struct keyring_list **_prealloc);
+ unsigned long *_prealloc);
extern int __key_link_check_live_key(struct key *keyring, struct key *key);
extern void __key_link(struct key *keyring, struct key *key,
- struct keyring_list **_prealloc);
+ unsigned long *_prealloc);
extern void __key_link_end(struct key *keyring,
struct key_type *type,
- struct keyring_list *prealloc);
+ unsigned long prealloc);
extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
const struct key_type *type,
@@ -146,13 +148,13 @@ extern unsigned key_gc_delay;
extern void keyring_gc(struct key *keyring, time_t limit);
extern void key_schedule_gc(time_t expiry_at);
-/*
- * check to see whether permission is granted to use a key in the desired way
- */
extern int key_task_permission(const key_ref_t key_ref,
const struct cred *cred,
key_perm_t perm);
+/*
+ * Check to see whether permission is granted to use a key in the desired way.
+ */
static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
{
return key_task_permission(key_ref, current_cred(), perm);
@@ -168,7 +170,7 @@ static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
#define KEY_ALL 0x3f /* all the above permissions */
/*
- * request_key authorisation
+ * Authorisation record for request_key().
*/
struct request_key_auth {
struct key *target_key;
@@ -188,7 +190,7 @@ extern struct key *request_key_auth_new(struct key *target,
extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
/*
- * keyctl functions
+ * keyctl() functions
*/
extern long keyctl_get_keyring_ID(key_serial_t, int);
extern long keyctl_join_session_keyring(const char __user *);
@@ -214,7 +216,7 @@ extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
extern long keyctl_session_to_parent(void);
/*
- * debugging key validation
+ * Debugging key validation
*/
#ifdef KEY_DEBUGGING
extern void __key_check(const struct key *);
diff --git a/security/keys/key.c b/security/keys/key.c
index c1eac8084ade..1c2d43dc5107 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -39,10 +39,10 @@ static DECLARE_RWSEM(key_types_sem);
static void key_cleanup(struct work_struct *work);
static DECLARE_WORK(key_cleanup_task, key_cleanup);
-/* we serialise key instantiation and link */
+/* We serialise key instantiation and link */
DEFINE_MUTEX(key_construction_mutex);
-/* any key who's type gets unegistered will be re-typed to this */
+/* Any key who's type gets unegistered will be re-typed to this */
static struct key_type key_type_dead = {
.name = "dead",
};
@@ -56,10 +56,9 @@ void __key_check(const struct key *key)
}
#endif
-/*****************************************************************************/
/*
- * get the key quota record for a user, allocating a new record if one doesn't
- * already exist
+ * Get the key quota record for a user, allocating a new record if one doesn't
+ * already exist.
*/
struct key_user *key_user_lookup(uid_t uid, struct user_namespace *user_ns)
{
@@ -67,7 +66,7 @@ struct key_user *key_user_lookup(uid_t uid, struct user_namespace *user_ns)
struct rb_node *parent = NULL;
struct rb_node **p;
- try_again:
+try_again:
p = &key_user_tree.rb_node;
spin_lock(&key_user_lock);
@@ -124,18 +123,16 @@ struct key_user *key_user_lookup(uid_t uid, struct user_namespace *user_ns)
goto out;
/* okay - we found a user record for this UID */
- found:
+found:
atomic_inc(&user->usage);
spin_unlock(&key_user_lock);
kfree(candidate);
- out:
+out:
return user;
+}
-} /* end key_user_lookup() */
-
-/*****************************************************************************/
/*
- * dispose of a user structure
+ * Dispose of a user structure
*/
void key_user_put(struct key_user *user)
{
@@ -146,14 +143,11 @@ void key_user_put(struct key_user *user)
kfree(user);
}
+}
-} /* end key_user_put() */
-
-/*****************************************************************************/
/*
- * assign a key the next unique serial number
- * - these are assigned randomly to avoid security issues through covert
- * channel problems
+ * Allocate a serial number for a key. These are assigned randomly to avoid
+ * security issues through covert channel problems.
*/
static inline void key_alloc_serial(struct key *key)
{
@@ -211,18 +205,36 @@ serial_exists:
if (key->serial < xkey->serial)
goto attempt_insertion;
}
+}
-} /* end key_alloc_serial() */
-
-/*****************************************************************************/
-/*
- * allocate a key of the specified type
- * - update the user's quota to reflect the existence of the key
- * - called from a key-type operation with key_types_sem read-locked by
- * key_create_or_update()
- * - this prevents unregistration of the key type
- * - upon return the key is as yet uninstantiated; the caller needs to either
- * instantiate the key or discard it before returning
+/**
+ * key_alloc - Allocate a key of the specified type.
+ * @type: The type of key to allocate.
+ * @desc: The key description to allow the key to be searched out.
+ * @uid: The owner of the new key.
+ * @gid: The group ID for the new key's group permissions.
+ * @cred: The credentials specifying UID namespace.
+ * @perm: The permissions mask of the new key.
+ * @flags: Flags specifying quota properties.
+ *
+ * Allocate a key of the specified type with the attributes given. The key is
+ * returned in an uninstantiated state and the caller needs to instantiate the
+ * key before returning.
+ *
+ * The user's key count quota is updated to reflect the creation of the key and
+ * the user's key data quota has the default for the key type reserved. The
+ * instantiation function should amend this as necessary. If insufficient
+ * quota is available, -EDQUOT will be returned.
+ *
+ * The LSM security modules can prevent a key being created, in which case
+ * -EACCES will be returned.
+ *
+ * Returns a pointer to the new key if successful and an error code otherwise.
+ *
+ * Note that the caller needs to ensure the key type isn't uninstantiated.
+ * Internally this can be done by locking key_types_sem. Externally, this can
+ * be done by either never unregistering the key type, or making sure
+ * key_alloc() calls don't race with module unloading.
*/
struct key *key_alloc(struct key_type *type, const char *desc,
uid_t uid, gid_t gid, const struct cred *cred,
@@ -344,14 +356,19 @@ no_quota:
key_user_put(user);
key = ERR_PTR(-EDQUOT);
goto error;
-
-} /* end key_alloc() */
-
+}
EXPORT_SYMBOL(key_alloc);
-/*****************************************************************************/
-/*
- * reserve an amount of quota for the key's payload
+/**
+ * key_payload_reserve - Adjust data quota reservation for the key's payload
+ * @key: The key to make the reservation for.
+ * @datalen: The amount of data payload the caller now wants.
+ *
+ * Adjust the amount of the owning user's key data quota that a key reserves.
+ * If the amount is increased, then -EDQUOT may be returned if there isn't
+ * enough free quota available.
+ *
+ * If successful, 0 is returned.
*/
int key_payload_reserve(struct key *key, size_t datalen)
{
@@ -384,22 +401,21 @@ int key_payload_reserve(struct key *key, size_t datalen)
key->datalen = datalen;
return ret;
-
-} /* end key_payload_reserve() */
-
+}
EXPORT_SYMBOL(key_payload_reserve);
-/*****************************************************************************/
/*
- * instantiate a key and link it into the target keyring atomically
- * - called with the target keyring's semaphore writelocked
+ * Instantiate a key and link it into the target keyring atomically. Must be
+ * called with the target keyring's semaphore writelocked. The target key's
+ * semaphore need not be locked as instantiation is serialised by
+ * key_construction_mutex.
*/
static int __key_instantiate_and_link(struct key *key,
const void *data,
size_t datalen,
struct key *keyring,
struct key *authkey,
- struct keyring_list **_prealloc)
+ unsigned long *_prealloc)
{
int ret, awaken;
@@ -441,12 +457,23 @@ static int __key_instantiate_and_link(struct key *key,
wake_up_bit(&key->flags, KEY_FLAG_USER_CONSTRUCT);
return ret;
+}
-} /* end __key_instantiate_and_link() */
-
-/*****************************************************************************/
-/*
- * instantiate a key and link it into the target keyring atomically
+/**
+ * key_instantiate_and_link - Instantiate a key and link it into the keyring.
+ * @key: The key to instantiate.
+ * @data: The data to use to instantiate the keyring.
+ * @datalen: The length of @data.
+ * @keyring: Keyring to create a link in on success (or NULL).
+ * @authkey: The authorisation token permitting instantiation.
+ *
+ * Instantiate a key that's in the uninstantiated state using the provided data
+ * and, if successful, link it in to the destination keyring if one is
+ * supplied.
+ *
+ * If successful, 0 is returned, the authorisation token is revoked and anyone
+ * waiting for the key is woken up. If the key was already instantiated,
+ * -EBUSY will be returned.
*/
int key_instantiate_and_link(struct key *key,
const void *data,
@@ -454,7 +481,7 @@ int key_instantiate_and_link(struct key *key,
struct key *keyring,
struct key *authkey)
{
- struct keyring_list *prealloc;
+ unsigned long prealloc;
int ret;
if (keyring) {
@@ -471,21 +498,35 @@ int key_instantiate_and_link(struct key *key,
__key_link_end(keyring, key->type, prealloc);
return ret;
-
-} /* end key_instantiate_and_link() */
+}
EXPORT_SYMBOL(key_instantiate_and_link);
-/*****************************************************************************/
-/*
- * negatively instantiate a key and link it into the target keyring atomically
+/**
+ * key_negate_and_link - Negatively instantiate a key and link it into the keyring.
+ * @key: The key to instantiate.
+ * @timeout: The timeout on the negative key.
+ * @keyring: Keyring to create a link in on success (or NULL).
+ * @authkey: The authorisation token permitting instantiation.
+ *
+ * Negatively instantiate a key that's in the uninstantiated state and, if
+ * successful, set its timeout and link it in to the destination keyring if one
+ * is supplied. The key and any links to the key will be automatically garbage
+ * collected after the timeout expires.
+ *
+ * Negative keys are used to rate limit repeated request_key() calls by causing
+ * them to return -ENOKEY until the negative key expires.
+ *
+ * If successful, 0 is returned, the authorisation token is revoked and anyone
+ * waiting for the key is woken up. If the key was already instantiated,
+ * -EBUSY will be returned.
*/
int key_negate_and_link(struct key *key,
unsigned timeout,
struct key *keyring,
struct key *authkey)
{
- struct keyring_list *prealloc;
+ unsigned long prealloc;
struct timespec now;
int ret, awaken, link_ret = 0;
@@ -535,22 +576,23 @@ int key_negate_and_link(struct key *key,
wake_up_bit(&key->flags, KEY_FLAG_USER_CONSTRUCT);
return ret == 0 ? link_ret : ret;
-
-} /* end key_negate_and_link() */
+}
EXPORT_SYMBOL(key_negate_and_link);
-/*****************************************************************************/
/*
- * do cleaning up in process context so that we don't have to disable
- * interrupts all over the place
+ * Garbage collect keys in process context so that we don't have to disable
+ * interrupts all over the place.
+ *
+ * key_put() schedules this rather than trying to do the cleanup itself, which
+ * means key_put() doesn't have to sleep.
*/
static void key_cleanup(struct work_struct *work)
{
struct rb_node *_n;
struct key *key;
- go_again:
+go_again:
/* look for a dead key in the tree */
spin_lock(&key_serial_lock);
@@ -564,7 +606,7 @@ static void key_cleanup(struct work_struct *work)
spin_unlock(&key_serial_lock);
return;
- found_dead_key:
+found_dead_key:
/* we found a dead key - once we've removed it from the tree, we can
* drop the lock */
rb_erase(&key->serial_node, &key_serial_tree);
@@ -601,14 +643,15 @@ static void key_cleanup(struct work_struct *work)
/* there may, of course, be more than one key to destroy */
goto go_again;
+}
-} /* end key_cleanup() */
-
-/*****************************************************************************/
-/*
- * dispose of a reference to a key
- * - when all the references are gone, we schedule the cleanup task to come and
- * pull it out of the tree in definite process context
+/**
+ * key_put - Discard a reference to a key.
+ * @key: The key to discard a reference from.
+ *
+ * Discard a reference to a key, and when all the references are gone, we
+ * schedule the cleanup task to come and pull it out of the tree in process
+ * context at some later time.
*/
void key_put(struct key *key)
{
@@ -618,14 +661,11 @@ void key_put(struct key *key)
if (atomic_dec_and_test(&key->usage))
schedule_work(&key_cleanup_task);
}
-
-} /* end key_put() */
-
+}
EXPORT_SYMBOL(key_put);
-/*****************************************************************************/
/*
- * find a key by its serial number
+ * Find a key by its serial number.
*/
struct key *key_lookup(key_serial_t id)
{
@@ -647,11 +687,11 @@ struct key *key_lookup(key_serial_t id)
goto found;
}
- not_found:
+not_found:
key = ERR_PTR(-ENOKEY);
goto error;
- found:
+found:
/* pretend it doesn't exist if it is awaiting deletion */
if (atomic_read(&key->usage) == 0)
goto not_found;
@@ -661,16 +701,16 @@ struct key *key_lookup(key_serial_t id)
*/
atomic_inc(&key->usage);
- error:
+error:
spin_unlock(&key_serial_lock);
return key;
+}
-} /* end key_lookup() */
-
-/*****************************************************************************/
/*
- * find and lock the specified key type against removal
- * - we return with the sem readlocked
+ * Find and lock the specified key type against removal.
+ *
+ * We return with the sem read-locked if successful. If the type wasn't
+ * available -ENOKEY is returned instead.
*/
struct key_type *key_type_lookup(const char *type)
{
@@ -688,26 +728,23 @@ struct key_type *key_type_lookup(const char *type)
up_read(&key_types_sem);
ktype = ERR_PTR(-ENOKEY);
- found_kernel_type:
+found_kernel_type:
return ktype;
+}
-} /* end key_type_lookup() */
-
-/*****************************************************************************/
/*
- * unlock a key type
+ * Unlock a key type locked by key_type_lookup().
*/
void key_type_put(struct key_type *ktype)
{
up_read(&key_types_sem);
+}
-} /* end key_type_put() */
-
-/*****************************************************************************/
/*
- * attempt to update an existing key
- * - the key has an incremented refcount
- * - we need to put the key if we get an error
+ * Attempt to update an existing key.
+ *
+ * The key is given to us with an incremented refcount that we need to discard
+ * if we get an error.
*/
static inline key_ref_t __key_update(key_ref_t key_ref,
const void *payload, size_t plen)
@@ -742,13 +779,32 @@ error:
key_put(key);
key_ref = ERR_PTR(ret);
goto out;
+}
-} /* end __key_update() */
-
-/*****************************************************************************/
-/*
- * search the specified keyring for a key of the same description; if one is
- * found, update it, otherwise add a new one
+/**
+ * key_create_or_update - Update or create and instantiate a key.
+ * @keyring_ref: A pointer to the destination keyring with possession flag.
+ * @type: The type of key.
+ * @description: The searchable description for the key.
+ * @payload: The data to use to instantiate or update the key.
+ * @plen: The length of @payload.
+ * @perm: The permissions mask for a new key.
+ * @flags: The quota flags for a new key.
+ *
+ * Search the destination keyring for a key of the same description and if one
+ * is found, update it, otherwise create and instantiate a new one and create a
+ * link to it from that keyring.
+ *
+ * If perm is KEY_PERM_UNDEF then an appropriate key permissions mask will be
+ * concocted.
+ *
+ * Returns a pointer to the new key if successful, -ENODEV if the key type
+ * wasn't available, -ENOTDIR if the keyring wasn't a keyring, -EACCES if the
+ * caller isn't permitted to modify the keyring or the LSM did not permit
+ * creation of the key.
+ *
+ * On success, the possession flag from the keyring ref will be tacked on to
+ * the key ref before it is returned.
*/
key_ref_t key_create_or_update(key_ref_t keyring_ref,
const char *type,
@@ -758,7 +814,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
key_perm_t perm,
unsigned long flags)
{
- struct keyring_list *prealloc;
+ unsigned long prealloc;
const struct cred *cred = current_cred();
struct key_type *ktype;
struct key *keyring, *key = NULL;
@@ -855,14 +911,21 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
key_ref = __key_update(key_ref, payload, plen);
goto error;
-
-} /* end key_create_or_update() */
-
+}
EXPORT_SYMBOL(key_create_or_update);
-/*****************************************************************************/
-/*
- * update a key
+/**
+ * key_update - Update a key's contents.
+ * @key_ref: The pointer (plus possession flag) to the key.
+ * @payload: The data to be used to update the key.
+ * @plen: The length of @payload.
+ *
+ * Attempt to update the contents of a key with the given payload data. The
+ * caller must be granted Write permission on the key. Negative keys can be
+ * instantiated by this method.
+ *
+ * Returns 0 on success, -EACCES if not permitted and -EOPNOTSUPP if the key
+ * type does not support updating. The key type may return other errors.
*/
int key_update(key_ref_t key_ref, const void *payload, size_t plen)
{
@@ -891,14 +954,17 @@ int key_update(key_ref_t key_ref, const void *payload, size_t plen)
error:
return ret;
-
-} /* end key_update() */
-
+}
EXPORT_SYMBOL(key_update);
-/*****************************************************************************/
-/*
- * revoke a key
+/**
+ * key_revoke - Revoke a key.
+ * @key: The key to be revoked.
+ *
+ * Mark a key as being revoked and ask the type to free up its resources. The
+ * revocation timeout is set and the key and all its links will be
+ * automatically garbage collected after key_gc_delay amount of time if they
+ * are not manually dealt with first.
*/
void key_revoke(struct key *key)
{
@@ -926,14 +992,16 @@ void key_revoke(struct key *key)
}
up_write(&key->sem);
-
-} /* end key_revoke() */
-
+}
EXPORT_SYMBOL(key_revoke);
-/*****************************************************************************/
-/*
- * register a type of key
+/**
+ * register_key_type - Register a type of key.
+ * @ktype: The new key type.
+ *
+ * Register a new key type.
+ *
+ * Returns 0 on success or -EEXIST if a type of this name already exists.
*/
int register_key_type(struct key_type *ktype)
{
@@ -953,17 +1021,19 @@ int register_key_type(struct key_type *ktype)
list_add(&ktype->link, &key_types_list);
ret = 0;
- out:
+out:
up_write(&key_types_sem);
return ret;
-
-} /* end register_key_type() */
-
+}
EXPORT_SYMBOL(register_key_type);
-/*****************************************************************************/
-/*
- * unregister a type of key
+/**
+ * unregister_key_type - Unregister a type of key.
+ * @ktype: The key type.
+ *
+ * Unregister a key type and mark all the extant keys of this type as dead.
+ * Those keys of this type are then destroyed to get rid of their payloads and
+ * they and their links will be garbage collected as soon as possible.
*/
void unregister_key_type(struct key_type *ktype)
{
@@ -1010,14 +1080,11 @@ void unregister_key_type(struct key_type *ktype)
up_write(&key_types_sem);
key_schedule_gc(0);
-
-} /* end unregister_key_type() */
-
+}
EXPORT_SYMBOL(unregister_key_type);
-/*****************************************************************************/
/*
- * initialise the key management stuff
+ * Initialise the key management state.
*/
void __init key_init(void)
{
@@ -1037,5 +1104,4 @@ void __init key_init(void)
rb_insert_color(&root_key_user.node,
&key_user_tree);
-
-} /* end key_init() */
+}
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 60924f6a52db..31a0fd8189f1 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1,4 +1,4 @@
-/* keyctl.c: userspace keyctl operations
+/* Userspace key control operations
*
* Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
@@ -31,28 +31,24 @@ static int key_get_type_from_user(char *type,
int ret;
ret = strncpy_from_user(type, _type, len);
-
if (ret < 0)
return ret;
-
if (ret == 0 || ret >= len)
return -EINVAL;
-
if (type[0] == '.')
return -EPERM;
-
type[len - 1] = '\0';
-
return 0;
}
-/*****************************************************************************/
/*
- * extract the description of a new key from userspace and either add it as a
- * new key to the specified keyring or update a matching key in that keyring
- * - the keyring must be writable
- * - returns the new key's serial number
- * - implements add_key()
+ * Extract the description of a new key from userspace and either add it as a
+ * new key to the specified keyring or update a matching key in that keyring.
+ *
+ * The keyring must be writable so that we can attach the key to it.
+ *
+ * If successful, the new key's serial number is returned, otherwise an error
+ * code is returned.
*/
SYSCALL_DEFINE5(add_key, const char __user *, _type,
const char __user *, _description,
@@ -132,19 +128,20 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
kfree(description);
error:
return ret;
+}
-} /* end sys_add_key() */
-
-/*****************************************************************************/
/*
- * search the process keyrings for a matching key
- * - nested keyrings may also be searched if they have Search permission
- * - if a key is found, it will be attached to the destination keyring if
- * there's one specified
- * - /sbin/request-key will be invoked if _callout_info is non-NULL
- * - the _callout_info string will be passed to /sbin/request-key
- * - if the _callout_info string is empty, it will be rendered as "-"
- * - implements request_key()
+ * Search the process keyrings and keyring trees linked from those for a
+ * matching key. Keyrings must have appropriate Search permission to be
+ * searched.
+ *
+ * If a key is found, it will be attached to the destination keyring if there's
+ * one specified and the serial number of the key will be returned.
+ *
+ * If no key is found, /sbin/request-key will be invoked if _callout_info is
+ * non-NULL in an attempt to create a key. The _callout_info string will be
+ * passed to /sbin/request-key to aid with completing the request. If the
+ * _callout_info string is "" then it will be changed to "-".
*/
SYSCALL_DEFINE4(request_key, const char __user *, _type,
const char __user *, _description,
@@ -222,14 +219,14 @@ error2:
kfree(description);
error:
return ret;
+}
-} /* end sys_request_key() */
-
-/*****************************************************************************/
/*
- * get the ID of the specified process keyring
- * - the keyring must have search permission to be found
- * - implements keyctl(KEYCTL_GET_KEYRING_ID)
+ * Get the ID of the specified process keyring.
+ *
+ * The requested keyring must have search permission to be found.
+ *
+ * If successful, the ID of the requested keyring will be returned.
*/
long keyctl_get_keyring_ID(key_serial_t id, int create)
{
@@ -248,13 +245,17 @@ long keyctl_get_keyring_ID(key_serial_t id, int create)
key_ref_put(key_ref);
error:
return ret;
+}
-} /* end keyctl_get_keyring_ID() */
-
-/*****************************************************************************/
/*
- * join the session keyring
- * - implements keyctl(KEYCTL_JOIN_SESSION_KEYRING)
+ * Join a (named) session keyring.
+ *
+ * Create and join an anonymous session keyring or join a named session
+ * keyring, creating it if necessary. A named session keyring must have Search
+ * permission for it to be joined. Session keyrings without this permit will
+ * be skipped over.
+ *
+ * If successful, the ID of the joined session keyring will be returned.
*/
long keyctl_join_session_keyring(const char __user *_name)
{
@@ -277,14 +278,17 @@ long keyctl_join_session_keyring(const char __user *_name)
error:
return ret;
+}
-} /* end keyctl_join_session_keyring() */
-
-/*****************************************************************************/
/*
- * update a key's data payload
- * - the key must be writable
- * - implements keyctl(KEYCTL_UPDATE)
+ * Update a key's data payload from the given data.
+ *
+ * The key must grant the caller Write permission and the key type must support
+ * updating for this to work. A negative key can be positively instantiated
+ * with this call.
+ *
+ * If successful, 0 will be returned. If the key type does not support
+ * updating, then -EOPNOTSUPP will be returned.
*/
long keyctl_update_key(key_serial_t id,
const void __user *_payload,
@@ -326,14 +330,17 @@ error2:
kfree(payload);
error:
return ret;
+}
-} /* end keyctl_update_key() */
-
-/*****************************************************************************/
/*
- * revoke a key
- * - the key must be writable
- * - implements keyctl(KEYCTL_REVOKE)
+ * Revoke a key.
+ *
+ * The key must be grant the caller Write or Setattr permission for this to
+ * work. The key type should give up its quota claim when revoked. The key
+ * and any links to the key will be automatically garbage collected after a
+ * certain amount of time (/proc/sys/kernel/keys/gc_delay).
+ *
+ * If successful, 0 is returned.
*/
long keyctl_revoke_key(key_serial_t id)
{
@@ -358,14 +365,14 @@ long keyctl_revoke_key(key_serial_t id)
key_ref_put(key_ref);
error:
return ret;
+}
-} /* end keyctl_revoke_key() */
-
-/*****************************************************************************/
/*
- * clear the specified process keyring
- * - the keyring must be writable
- * - implements keyctl(KEYCTL_CLEAR)
+ * Clear the specified keyring, creating an empty process keyring if one of the
+ * special keyring IDs is used.
+ *
+ * The keyring must grant the caller Write permission for this to work. If
+ * successful, 0 will be returned.
*/
long keyctl_keyring_clear(key_serial_t ringid)
{
@@ -383,15 +390,18 @@ long keyctl_keyring_clear(key_serial_t ringid)
key_ref_put(keyring_ref);
error:
return ret;
+}
-} /* end keyctl_keyring_clear() */
-
-/*****************************************************************************/
/*
- * link a key into a keyring
- * - the keyring must be writable
- * - the key must be linkable
- * - implements keyctl(KEYCTL_LINK)
+ * Create a link from a keyring to a key if there's no matching key in the
+ * keyring, otherwise replace the link to the matching key with a link to the
+ * new key.
+ *
+ * The key must grant the caller Link permission and the the keyring must grant
+ * the caller Write permission. Furthermore, if an additional link is created,
+ * the keyring's quota will be extended.
+ *
+ * If successful, 0 will be returned.
*/
long keyctl_keyring_link(key_serial_t id, key_serial_t ringid)
{
@@ -417,15 +427,16 @@ error2:
key_ref_put(keyring_ref);
error:
return ret;
+}
-} /* end keyctl_keyring_link() */
-
-/*****************************************************************************/
/*
- * unlink the first attachment of a key from a keyring
- * - the keyring must be writable
- * - we don't need any permissions on the key
- * - implements keyctl(KEYCTL_UNLINK)
+ * Unlink a key from a keyring.
+ *
+ * The keyring must grant the caller Write permission for this to work; the key
+ * itself need not grant the caller anything. If the last link to a key is
+ * removed then that key will be scheduled for destruction.
+ *
+ * If successful, 0 will be returned.
*/
long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid)
{
@@ -451,19 +462,20 @@ error2:
key_ref_put(keyring_ref);
error:
return ret;
+}
-} /* end keyctl_keyring_unlink() */
-
-/*****************************************************************************/
/*
- * describe a user key
- * - the key must have view permission
- * - if there's a buffer, we place up to buflen bytes of data into it
- * - unless there's an error, we return the amount of description available,
- * irrespective of how much we may have copied
- * - the description is formatted thus:
+ * Return a description of a key to userspace.
+ *
+ * The key must grant the caller View permission for this to work.
+ *
+ * If there's a buffer, we place up to buflen bytes of data into it formatted
+ * in the following way:
+ *
* type;uid;gid;perm;description<NUL>
- * - implements keyctl(KEYCTL_DESCRIBE)
+ *
+ * If successful, we return the amount of description available, irrespective
+ * of how much we may have copied into the buffer.
*/
long keyctl_describe_key(key_serial_t keyid,
char __user *buffer,
@@ -531,18 +543,17 @@ error2:
key_ref_put(key_ref);
error:
return ret;
+}
-} /* end keyctl_describe_key() */
-
-/*****************************************************************************/
/*
- * search the specified keyring for a matching key
- * - the start keyring must be searchable
- * - nested keyrings may also be searched if they are searchable
- * - only keys with search permission may be found
- * - if a key is found, it will be attached to the destination keyring if
- * there's one specified
- * - implements keyctl(KEYCTL_SEARCH)
+ * Search the specified keyring and any keyrings it links to for a matching
+ * key. Only keyrings that grant the caller Search permission will be searched
+ * (this includes the starting keyring). Only keys with Search permission can
+ * be found.
+ *
+ * If successful, the found key will be linked to the destination keyring if
+ * supplied and the key has Link permission, and the found key ID will be
+ * returned.
*/
long keyctl_keyring_search(key_serial_t ringid,
const char __user *_type,
@@ -626,18 +637,17 @@ error2:
kfree(description);
error:
return ret;
+}
-} /* end keyctl_keyring_search() */
-
-/*****************************************************************************/
/*
- * read a user key's payload
- * - the keyring must be readable or the key must be searchable from the
- * process's keyrings
- * - if there's a buffer, we place up to buflen bytes of data into it
- * - unless there's an error, we return the amount of data in the key,
- * irrespective of how much we may have copied
- * - implements keyctl(KEYCTL_READ)
+ * Read a key's payload.
+ *
+ * The key must either grant the caller Read permission, or it must grant the
+ * caller Search permission when searched for from the process keyrings.
+ *
+ * If successful, we place up to buflen bytes of data into the buffer, if one
+ * is provided, and return the amount of data that is available in the key,
+ * irrespective of how much we copied into the buffer.
*/
long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
{
@@ -688,15 +698,22 @@ error2:
key_put(key);
error:
return ret;
+}
-} /* end keyctl_read_key() */
-
-/*****************************************************************************/
/*
- * change the ownership of a key
- * - the keyring owned by the changer
- * - if the uid or gid is -1, then that parameter is not changed
- * - implements keyctl(KEYCTL_CHOWN)
+ * Change the ownership of a key
+ *
+ * The key must grant the caller Setattr permission for this to work, though
+ * the key need not be fully instantiated yet. For the UID to be changed, or
+ * for the GID to be changed to a group the caller is not a member of, the
+ * caller must have sysadmin capability. If either uid or gid is -1 then that
+ * attribute is not changed.
+ *
+ * If the UID is to be changed, the new user must have sufficient quota to
+ * accept the key. The quota deduction will be removed from the old user to
+ * the new user should the attribute be changed.
+ *
+ * If successful, 0 will be returned.
*/
long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid)
{
@@ -796,14 +813,14 @@ quota_overrun:
zapowner = newowner;
ret = -EDQUOT;
goto error_put;
+}
-} /* end keyctl_chown_key() */
-
-/*****************************************************************************/
/*
- * change the permission mask on a key
- * - the keyring owned by the changer
- * - implements keyctl(KEYCTL_SETPERM)
+ * Change the permission mask on a key.
+ *
+ * The key must grant the caller Setattr permission for this to work, though
+ * the key need not be fully instantiated yet. If the caller does not have
+ * sysadmin capability, it may only change the permission on keys that it owns.
*/
long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
{
@@ -838,11 +855,11 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
key_put(key);
error:
return ret;
-
-} /* end keyctl_setperm_key() */
+}
/*
- * get the destination keyring for instantiation
+ * Get the destination keyring for instantiation and check that the caller has
+ * Write permission on it.
*/
static long get_instantiation_keyring(key_serial_t ringid,
struct request_key_auth *rka,
@@ -879,7 +896,7 @@ static long get_instantiation_keyring(key_serial_t ringid,
}
/*
- * change the request_key authorisation key on the current process
+ * Change the request_key authorisation key on the current process.
*/
static int keyctl_change_reqkey_auth(struct key *key)
{
@@ -895,10 +912,14 @@ static int keyctl_change_reqkey_auth(struct key *key)
return commit_creds(new);
}
-/*****************************************************************************/
/*
- * instantiate the key with the specified payload, and, if one is given, link
- * the key into the keyring
+ * Instantiate a key with the specified payload and link the key into the
+ * destination keyring if one is given.
+ *
+ * The caller must have the appropriate instantiation permit set for this to
+ * work (see keyctl_assume_authority). No other permissions are required.
+ *
+ * If successful, 0 will be returned.
*/
long keyctl_instantiate_key(key_serial_t id,
const void __user *_payload,
@@ -973,13 +994,22 @@ error2:
vfree(payload);
error:
return ret;
+}
-} /* end keyctl_instantiate_key() */
-
-/*****************************************************************************/
/*
- * negatively instantiate the key with the given timeout (in seconds), and, if
- * one is given, link the key into the keyring
+ * Negatively instantiate the key with the given timeout (in seconds) and link
+ * the key into the destination keyring if one is given.
+ *
+ * The caller must have the appropriate instantiation permit set for this to
+ * work (see keyctl_assume_authority). No other permissions are required.
+ *
+ * The key and any links to the key will be automatically garbage collected
+ * after the timeout expires.
+ *
+ * Negative keys are used to rate limit repeated request_key() calls by causing
+ * them to return -ENOKEY until the negative key expires.
+ *
+ * If successful, 0 will be returned.
*/
long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
{
@@ -1020,13 +1050,14 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
error:
return ret;
+}
-} /* end keyctl_negate_key() */
-
-/*****************************************************************************/
/*
- * set the default keyring in which request_key() will cache keys
- * - return the old setting
+ * Read or set the default keyring in which request_key() will cache keys and
+ * return the old setting.
+ *
+ * If a process keyring is specified then this will be created if it doesn't
+ * yet exist. The old setting will be returned if successful.
*/
long keyctl_set_reqkey_keyring(int reqkey_defl)
{
@@ -1079,12 +1110,19 @@ set:
error:
abort_creds(new);
return ret;
+}
-} /* end keyctl_set_reqkey_keyring() */
-
-/*****************************************************************************/
/*
- * set or clear the timeout for a key
+ * Set or clear the timeout on a key.
+ *
+ * Either the key must grant the caller Setattr permission or else the caller
+ * must hold an instantiation authorisation token for the key.
+ *
+ * The timeout is either 0 to clear the timeout, or a number of seconds from
+ * the current time. The key and any links to the key will be automatically
+ * garbage collected after the timeout expires.
+ *
+ * If successful, 0 is returned.
*/
long keyctl_set_timeout(key_serial_t id, unsigned timeout)
{
@@ -1136,12 +1174,24 @@ okay:
ret = 0;
error:
return ret;
+}
-} /* end keyctl_set_timeout() */
-
-/*****************************************************************************/
/*
- * assume the authority to instantiate the specified key
+ * Assume (or clear) the authority to instantiate the specified key.
+ *
+ * This sets the authoritative token currently in force for key instantiation.
+ * This must be done for a key to be instantiated. It has the effect of making
+ * available all the keys from the caller of the request_key() that created a
+ * key to request_key() calls made by the caller of this function.
+ *
+ * The caller must have the instantiation key in their process keyrings with a
+ * Search permission grant available to the caller.
+ *
+ * If the ID given is 0, then the setting will be cleared and 0 returned.
+ *
+ * If the ID given has a matching an authorisation key, then that key will be
+ * set and its ID will be returned. The authorisation key can be read to get
+ * the callout information passed to request_key().
*/
long keyctl_assume_authority(key_serial_t id)
{
@@ -1178,16 +1228,17 @@ long keyctl_assume_authority(key_serial_t id)
ret = authkey->serial;
error:
return ret;
-
-} /* end keyctl_assume_authority() */
+}
/*
- * get the security label of a key
- * - the key must grant us view permission
- * - if there's a buffer, we place up to buflen bytes of data into it
- * - unless there's an error, we return the amount of information available,
- * irrespective of how much we may have copied (including the terminal NUL)
- * - implements keyctl(KEYCTL_GET_SECURITY)
+ * Get a key's the LSM security label.
+ *
+ * The key must grant the caller View permission for this to work.
+ *
+ * If there's a buffer, then up to buflen bytes of data will be placed into it.
+ *
+ * If successful, the amount of information available will be returned,
+ * irrespective of how much was copied (including the terminal NUL).
*/
long keyctl_get_security(key_serial_t keyid,
char __user *buffer,
@@ -1242,10 +1293,16 @@ long keyctl_get_security(key_serial_t keyid,
}
/*
- * attempt to install the calling process's session keyring on the process's
- * parent process
- * - the keyring must exist and must grant us LINK permission
- * - implements keyctl(KEYCTL_SESSION_TO_PARENT)
+ * Attempt to install the calling process's session keyring on the process's
+ * parent process.
+ *
+ * The keyring must exist and must grant the caller LINK permission, and the
+ * parent process must be single-threaded and must have the same effective
+ * ownership as this process and mustn't be SUID/SGID.
+ *
+ * The keyring will be emplaced on the parent when it next resumes userspace.
+ *
+ * If successful, 0 will be returned.
*/
long keyctl_session_to_parent(void)
{
@@ -1348,9 +1405,8 @@ error_keyring:
#endif /* !TIF_NOTIFY_RESUME */
}
-/*****************************************************************************/
/*
- * the key control system call
+ * The key control system call
*/
SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3,
unsigned long, arg4, unsigned long, arg5)
@@ -1439,5 +1495,4 @@ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3,
default:
return -EOPNOTSUPP;
}
-
-} /* end sys_keyctl() */
+}
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index d37f713e73ce..5620f084dede 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -25,14 +25,16 @@
(keyring)->payload.subscriptions, \
rwsem_is_locked((struct rw_semaphore *)&(keyring)->sem)))
+#define KEY_LINK_FIXQUOTA 1UL
+
/*
- * when plumbing the depths of the key tree, this sets a hard limit set on how
- * deep we're willing to go
+ * When plumbing the depths of the key tree, this sets a hard limit
+ * set on how deep we're willing to go.
*/
#define KEYRING_SEARCH_MAX_DEPTH 6
/*
- * we keep all named keyrings in a hash to speed looking them up
+ * We keep all named keyrings in a hash to speed looking them up.
*/
#define KEYRING_NAME_HASH_SIZE (1 << 5)
@@ -50,7 +52,9 @@ static inline unsigned keyring_hash(const char *desc)
}
/*
- * the keyring type definition
+ * The keyring key type definition. Keyrings are simply keys of this type and
+ * can be treated as ordinary keys in addition to having their own special
+ * operations.
*/
static int keyring_instantiate(struct key *keyring,
const void *data, size_t datalen);
@@ -71,19 +75,17 @@ struct key_type key_type_keyring = {
.describe = keyring_describe,
.read = keyring_read,
};
-
EXPORT_SYMBOL(key_type_keyring);
/*
- * semaphore to serialise link/link calls to prevent two link calls in parallel
- * introducing a cycle
+ * Semaphore to serialise link/link calls to prevent two link calls in parallel
+ * introducing a cycle.
*/
static DECLARE_RWSEM(keyring_serialise_link_sem);
-/*****************************************************************************/
/*
- * publish the name of a keyring so that it can be found by name (if it has
- * one)
+ * Publish the name of a keyring so that it can be found by name (if it has
+ * one).
*/
static void keyring_publish_name(struct key *keyring)
{
@@ -102,13 +104,12 @@ static void keyring_publish_name(struct key *keyring)
write_unlock(&keyring_name_lock);
}
+}
-} /* end keyring_publish_name() */
-
-/*****************************************************************************/
/*
- * initialise a keyring
- * - we object if we were given any data
+ * Initialise a keyring.
+ *
+ * Returns 0 on success, -EINVAL if given any data.
*/
static int keyring_instantiate(struct key *keyring,
const void *data, size_t datalen)
@@ -123,23 +124,20 @@ static int keyring_instantiate(struct key *keyring,
}
return ret;
+}
-} /* end keyring_instantiate() */
-
-/*****************************************************************************/
/*
- * match keyrings on their name
+ * Match keyrings on their name
*/
static int keyring_match(const struct key *keyring, const void *description)
{
return keyring->description &&
strcmp(keyring->description, description) == 0;
+}
-} /* end keyring_match() */
-
-/*****************************************************************************/
/*
- * dispose of the data dangling from the corpse of a keyring
+ * Clean up a keyring when it is destroyed. Unpublish its name if it had one
+ * and dispose of its data.
*/
static void keyring_destroy(struct key *keyring)
{
@@ -164,12 +162,10 @@ static void keyring_destroy(struct key *keyring)
key_put(klist->keys[loop]);
kfree(klist);
}
+}
-} /* end keyring_destroy() */
-
-/*****************************************************************************/
/*
- * describe the keyring
+ * Describe a keyring for /proc.
*/
static void keyring_describe(const struct key *keyring, struct seq_file *m)
{
@@ -187,13 +183,12 @@ static void keyring_describe(const struct key *keyring, struct seq_file *m)
else
seq_puts(m, ": empty");
rcu_read_unlock();
+}
-} /* end keyring_describe() */
-
-/*****************************************************************************/
/*
- * read a list of key IDs from the keyring's contents
- * - the keyring's semaphore is read-locked
+ * Read a list of key IDs from the keyring's contents in binary form
+ *
+ * The keyring's semaphore is read-locked by the caller.
*/
static long keyring_read(const struct key *keyring,
char __user *buffer, size_t buflen)
@@ -241,12 +236,10 @@ static long keyring_read(const struct key *keyring,
error:
return ret;
+}
-} /* end keyring_read() */
-
-/*****************************************************************************/
/*
- * allocate a keyring and link into the destination keyring
+ * Allocate a keyring and link into the destination keyring.
*/
struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
const struct cred *cred, unsigned long flags,
@@ -269,20 +262,42 @@ struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
}
return keyring;
+}
-} /* end keyring_alloc() */
-
-/*****************************************************************************/
-/*
- * search the supplied keyring tree for a key that matches the criterion
- * - perform a breadth-then-depth search up to the prescribed limit
- * - we only find keys on which we have search permission
- * - we use the supplied match function to see if the description (or other
- * feature of interest) matches
- * - we rely on RCU to prevent the keyring lists from disappearing on us
- * - we return -EAGAIN if we didn't find any matching key
- * - we return -ENOKEY if we only found negative matching keys
- * - we propagate the possession attribute from the keyring ref to the key ref
+/**
+ * keyring_search_aux - Search a keyring tree for a key matching some criteria
+ * @keyring_ref: A pointer to the keyring with possession indicator.
+ * @cred: The credentials to use for permissions checks.
+ * @type: The type of key to search for.
+ * @description: Parameter for @match.
+ * @match: Function to rule on whether or not a key is the one required.
+ *
+ * Search the supplied keyring tree for a key that matches the criteria given.
+ * The root keyring and any linked keyrings must grant Search permission to the
+ * caller to be searchable and keys can only be found if they too grant Search
+ * to the caller. The possession flag on the root keyring pointer controls use
+ * of the possessor bits in permissions checking of the entire tree. In
+ * addition, the LSM gets to forbid keyring searches and key matches.
+ *
+ * The search is performed as a breadth-then-depth search up to the prescribed
+ * limit (KEYRING_SEARCH_MAX_DEPTH).
+ *
+ * Keys are matched to the type provided and are then filtered by the match
+ * function, which is given the description to use in any way it sees fit. The
+ * match function may use any attributes of a key that it wishes to to
+ * determine the match. Normally the match function from the key type would be
+ * used.
+ *
+ * RCU is used to prevent the keyring key lists from disappearing without the
+ * need to take lots of locks.
+ *
+ * Returns a pointer to the found key and increments the key usage count if
+ * successful; -EAGAIN if no matching keys were found, or if expired or revoked
+ * keys were found; -ENOKEY if only negative keys were found; -ENOTDIR if the
+ * specified keyring wasn't a keyring.
+ *
+ * In the case of a successful return, the possession attribute from
+ * @keyring_ref is propagated to the returned key reference.
*/
key_ref_t keyring_search_aux(key_ref_t keyring_ref,
const struct cred *cred,
@@ -444,17 +459,16 @@ error_2:
rcu_read_unlock();
error:
return key_ref;
+}
-} /* end keyring_search_aux() */
-
-/*****************************************************************************/
-/*
- * search the supplied keyring tree for a key that matches the criterion
- * - perform a breadth-then-depth search up to the prescribed limit
- * - we only find keys on which we have search permission
- * - we readlock the keyrings as we search down the tree
- * - we return -EAGAIN if we didn't find any matching key
- * - we return -ENOKEY if we only found negative matching keys
+/**
+ * keyring_search - Search the supplied keyring tree for a matching key
+ * @keyring: The root of the keyring tree to be searched.
+ * @type: The type of keyring we want to find.
+ * @description: The name of the keyring we want to find.
+ *
+ * As keyring_search_aux() above, but using the current task's credentials and
+ * type's default matching function.
*/
key_ref_t keyring_search(key_ref_t keyring,
struct key_type *type,
@@ -465,16 +479,23 @@ key_ref_t keyring_search(key_ref_t keyring,
return keyring_search_aux(keyring, current->cred,
type, description, type->match);
-
-} /* end keyring_search() */
-
+}
EXPORT_SYMBOL(keyring_search);
-/*****************************************************************************/
/*
- * search the given keyring only (no recursion)
- * - keyring must be locked by caller
- * - caller must guarantee that the keyring is a keyring
+ * Search the given keyring only (no recursion).
+ *
+ * The caller must guarantee that the keyring is a keyring and that the
+ * permission is granted to search the keyring as no check is made here.
+ *
+ * RCU is used to make it unnecessary to lock the keyring key list here.
+ *
+ * Returns a pointer to the found key with usage count incremented if
+ * successful and returns -ENOKEY if not found. Revoked keys and keys not
+ * providing the requested permission are skipped over.
+ *
+ * If successful, the possession indicator is propagated from the keyring ref
+ * to the returned key reference.
*/
key_ref_t __keyring_search_one(key_ref_t keyring_ref,
const struct key_type *ktype,
@@ -514,14 +535,18 @@ found:
atomic_inc(&key->usage);
rcu_read_unlock();
return make_key_ref(key, possessed);
+}
-} /* end __keyring_search_one() */
-
-/*****************************************************************************/
/*
- * find a keyring with the specified name
- * - all named keyrings are searched
- * - normally only finds keyrings with search permission for the current process
+ * Find a keyring with the specified name.
+ *
+ * All named keyrings in the current user namespace are searched, provided they
+ * grant Search permission directly to the caller (unless this check is
+ * skipped). Keyrings whose usage points have reached zero or who have been
+ * revoked are skipped.
+ *
+ * Returns a pointer to the keyring with the keyring's refcount having being
+ * incremented on success. -ENOKEY is returned if a key could not be found.
*/
struct key *find_keyring_by_name(const char *name, bool skip_perm_check)
{
@@ -569,15 +594,14 @@ struct key *find_keyring_by_name(const char *name, bool skip_perm_check)
out:
read_unlock(&keyring_name_lock);
return keyring;
+}
-} /* end find_keyring_by_name() */
-
-/*****************************************************************************/
/*
- * see if a cycle will will be created by inserting acyclic tree B in acyclic
- * tree A at the topmost level (ie: as a direct child of A)
- * - since we are adding B to A at the top level, checking for cycles should
- * just be a matter of seeing if node A is somewhere in tree B
+ * See if a cycle will will be created by inserting acyclic tree B in acyclic
+ * tree A at the topmost level (ie: as a direct child of A).
+ *
+ * Since we are adding B to A at the top level, checking for cycles should just
+ * be a matter of seeing if node A is somewhere in tree B.
*/
static int keyring_detect_cycle(struct key *A, struct key *B)
{
@@ -657,11 +681,10 @@ too_deep:
cycle_detected:
ret = -EDEADLK;
goto error;
-
-} /* end keyring_detect_cycle() */
+}
/*
- * dispose of a keyring list after the RCU grace period, freeing the unlinked
+ * Dispose of a keyring list after the RCU grace period, freeing the unlinked
* key
*/
static void keyring_unlink_rcu_disposal(struct rcu_head *rcu)
@@ -675,14 +698,14 @@ static void keyring_unlink_rcu_disposal(struct rcu_head *rcu)
}
/*
- * preallocate memory so that a key can be linked into to a keyring
+ * Preallocate memory so that a key can be linked into to a keyring.
*/
int __key_link_begin(struct key *keyring, const struct key_type *type,
- const char *description,
- struct keyring_list **_prealloc)
+ const char *description, unsigned long *_prealloc)
__acquires(&keyring->sem)
{
struct keyring_list *klist, *nklist;
+ unsigned long prealloc;
unsigned max;
size_t size;
int loop, ret;
@@ -725,6 +748,7 @@ int __key_link_begin(struct key *keyring, const struct key_type *type,
/* note replacement slot */
klist->delkey = nklist->delkey = loop;
+ prealloc = (unsigned long)nklist;
goto done;
}
}
@@ -739,6 +763,7 @@ int __key_link_begin(struct key *keyring, const struct key_type *type,
if (klist && klist->nkeys < klist->maxkeys) {
/* there's sufficient slack space to append directly */
nklist = NULL;
+ prealloc = KEY_LINK_FIXQUOTA;
} else {
/* grow the key list */
max = 4;
@@ -773,8 +798,9 @@ int __key_link_begin(struct key *keyring, const struct key_type *type,
nklist->keys[nklist->delkey] = NULL;
}
+ prealloc = (unsigned long)nklist | KEY_LINK_FIXQUOTA;
done:
- *_prealloc = nklist;
+ *_prealloc = prealloc;
kleave(" = 0");
return 0;
@@ -792,10 +818,10 @@ error_krsem:
}
/*
- * check already instantiated keys aren't going to be a problem
- * - the caller must have called __key_link_begin()
- * - don't need to call this for keys that were created since __key_link_begin()
- * was called
+ * Check already instantiated keys aren't going to be a problem.
+ *
+ * The caller must have called __key_link_begin(). Don't need to call this for
+ * keys that were created since __key_link_begin() was called.
*/
int __key_link_check_live_key(struct key *keyring, struct key *key)
{
@@ -807,17 +833,20 @@ int __key_link_check_live_key(struct key *keyring, struct key *key)
}
/*
- * link a key into to a keyring
- * - must be called with __key_link_begin() having being called
- * - discard already extant link to matching key if there is one
+ * Link a key into to a keyring.
+ *
+ * Must be called with __key_link_begin() having being called. Discards any
+ * already extant link to matching key if there is one, so that each keyring
+ * holds at most one link to any given key of a particular type+description
+ * combination.
*/
void __key_link(struct key *keyring, struct key *key,
- struct keyring_list **_prealloc)
+ unsigned long *_prealloc)
{
struct keyring_list *klist, *nklist;
- nklist = *_prealloc;
- *_prealloc = NULL;
+ nklist = (struct keyring_list *)(*_prealloc & ~KEY_LINK_FIXQUOTA);
+ *_prealloc = 0;
kenter("%d,%d,%p", keyring->serial, key->serial, nklist);
@@ -852,34 +881,54 @@ void __key_link(struct key *keyring, struct key *key,
}
/*
- * finish linking a key into to a keyring
- * - must be called with __key_link_begin() having being called
+ * Finish linking a key into to a keyring.
+ *
+ * Must be called with __key_link_begin() having being called.
*/
void __key_link_end(struct key *keyring, struct key_type *type,
- struct keyring_list *prealloc)
+ unsigned long prealloc)
__releases(&keyring->sem)
{
BUG_ON(type == NULL);
BUG_ON(type->name == NULL);
- kenter("%d,%s,%p", keyring->serial, type->name, prealloc);
+ kenter("%d,%s,%lx", keyring->serial, type->name, prealloc);
if (type == &key_type_keyring)
up_write(&keyring_serialise_link_sem);
if (prealloc) {
- kfree(prealloc);
- key_payload_reserve(keyring,
- keyring->datalen - KEYQUOTA_LINK_BYTES);
+ if (prealloc & KEY_LINK_FIXQUOTA)
+ key_payload_reserve(keyring,
+ keyring->datalen -
+ KEYQUOTA_LINK_BYTES);
+ kfree((struct keyring_list *)(prealloc & ~KEY_LINK_FIXQUOTA));
}
up_write(&keyring->sem);
}
-/*
- * link a key to a keyring
+/**
+ * key_link - Link a key to a keyring
+ * @keyring: The keyring to make the link in.
+ * @key: The key to link to.
+ *
+ * Make a link in a keyring to a key, such that the keyring holds a reference
+ * on that key and the key can potentially be found by searching that keyring.
+ *
+ * This function will write-lock the keyring's semaphore and will consume some
+ * of the user's key data quota to hold the link.
+ *
+ * Returns 0 if successful, -ENOTDIR if the keyring isn't a keyring,
+ * -EKEYREVOKED if the keyring has been revoked, -ENFILE if the keyring is
+ * full, -EDQUOT if there is insufficient key data quota remaining to add
+ * another link or -ENOMEM if there's insufficient memory.
+ *
+ * It is assumed that the caller has checked that it is permitted for a link to
+ * be made (the keyring should have Write permission and the key Link
+ * permission).
*/
int key_link(struct key *keyring, struct key *key)
{
- struct keyring_list *prealloc;
+ unsigned long prealloc;
int ret;
key_check(keyring);
@@ -895,12 +944,24 @@ int key_link(struct key *keyring, struct key *key)
return ret;
}
-
EXPORT_SYMBOL(key_link);
-/*****************************************************************************/
-/*
- * unlink the first link to a key from a keyring
+/**
+ * key_unlink - Unlink the first link to a key from a keyring.
+ * @keyring: The keyring to remove the link from.
+ * @key: The key the link is to.
+ *
+ * Remove a link from a keyring to a key.
+ *
+ * This function will write-lock the keyring's semaphore.
+ *
+ * Returns 0 if successful, -ENOTDIR if the keyring isn't a keyring, -ENOENT if
+ * the key isn't linked to by the keyring or -ENOMEM if there's insufficient
+ * memory.
+ *
+ * It is assumed that the caller has checked that it is permitted for a link to
+ * be removed (the keyring should have Write permission; no permissions are
+ * required on the key).
*/
int key_unlink(struct key *keyring, struct key *key)
{
@@ -968,15 +1029,12 @@ nomem:
ret = -ENOMEM;
up_write(&keyring->sem);
goto error;
-
-} /* end key_unlink() */
-
+}
EXPORT_SYMBOL(key_unlink);
-/*****************************************************************************/
/*
- * dispose of a keyring list after the RCU grace period, releasing the keys it
- * links to
+ * Dispose of a keyring list after the RCU grace period, releasing the keys it
+ * links to.
*/
static void keyring_clear_rcu_disposal(struct rcu_head *rcu)
{
@@ -989,13 +1047,15 @@ static void keyring_clear_rcu_disposal(struct rcu_head *rcu)
key_put(klist->keys[loop]);
kfree(klist);
+}
-} /* end keyring_clear_rcu_disposal() */
-
-/*****************************************************************************/
-/*
- * clear the specified process keyring
- * - implements keyctl(KEYCTL_CLEAR)
+/**
+ * keyring_clear - Clear a keyring
+ * @keyring: The keyring to clear.
+ *
+ * Clear the contents of the specified keyring.
+ *
+ * Returns 0 if successful or -ENOTDIR if the keyring isn't a keyring.
*/
int keyring_clear(struct key *keyring)
{
@@ -1027,15 +1087,13 @@ int keyring_clear(struct key *keyring)
}
return ret;
-
-} /* end keyring_clear() */
-
+}
EXPORT_SYMBOL(keyring_clear);
-/*****************************************************************************/
/*
- * dispose of the links from a revoked keyring
- * - called with the key sem write-locked
+ * Dispose of the links from a revoked keyring.
+ *
+ * This is called with the key sem write-locked.
*/
static void keyring_revoke(struct key *keyring)
{
@@ -1050,11 +1108,10 @@ static void keyring_revoke(struct key *keyring)
rcu_assign_pointer(keyring->payload.subscriptions, NULL);
call_rcu(&klist->rcu, keyring_clear_rcu_disposal);
}
-
-} /* end keyring_revoke() */
+}
/*
- * Determine whether a key is dead
+ * Determine whether a key is dead.
*/
static bool key_is_dead(struct key *key, time_t limit)
{
@@ -1063,7 +1120,12 @@ static bool key_is_dead(struct key *key, time_t limit)
}
/*
- * Collect garbage from the contents of a keyring
+ * Collect garbage from the contents of a keyring, replacing the old list with
+ * a new one with the pointers all shuffled down.
+ *
+ * Dead keys are classed as oned that are flagged as being dead or are revoked,
+ * expired or negative keys that were revoked or expired before the specified
+ * limit.
*/
void keyring_gc(struct key *keyring, time_t limit)
{
diff --git a/security/keys/permission.c b/security/keys/permission.c
index 28645502cd0d..c35b5229e3cd 100644
--- a/security/keys/permission.c
+++ b/security/keys/permission.c
@@ -1,4 +1,4 @@
-/* permission.c: key permission determination
+/* Key permission checking
*
* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
@@ -13,18 +13,19 @@
#include <linux/security.h>
#include "internal.h"
-/*****************************************************************************/
/**
* key_task_permission - Check a key can be used
- * @key_ref: The key to check
- * @cred: The credentials to use
- * @perm: The permissions to check for
+ * @key_ref: The key to check.
+ * @cred: The credentials to use.
+ * @perm: The permissions to check for.
*
* Check to see whether permission is granted to use a key in the desired way,
* but permit the security modules to override.
*
- * The caller must hold either a ref on cred or must hold the RCU readlock or a
- * spinlock.
+ * The caller must hold either a ref on cred or must hold the RCU readlock.
+ *
+ * Returns 0 if successful, -EACCES if access is denied based on the
+ * permissions bits or the LSM check.
*/
int key_task_permission(const key_ref_t key_ref, const struct cred *cred,
key_perm_t perm)
@@ -79,14 +80,16 @@ use_these_perms:
/* let LSM be the final arbiter */
return security_key_permission(key_ref, cred, perm);
-
-} /* end key_task_permission() */
-
+}
EXPORT_SYMBOL(key_task_permission);
-/*****************************************************************************/
-/*
- * validate a key
+/**
+ * key_validate - Validate a key.
+ * @key: The key to be validated.
+ *
+ * Check that a key is valid, returning 0 if the key is okay, -EKEYREVOKED if
+ * the key's type has been removed or if the key has been revoked or
+ * -EKEYEXPIRED if the key has expired.
*/
int key_validate(struct key *key)
{
@@ -111,7 +114,5 @@ int key_validate(struct key *key)
error:
return ret;
-
-} /* end key_validate() */
-
+}
EXPORT_SYMBOL(key_validate);
diff --git a/security/keys/proc.c b/security/keys/proc.c
index 70373966816e..525cf8a29cdd 100644
--- a/security/keys/proc.c
+++ b/security/keys/proc.c
@@ -1,4 +1,4 @@
-/* proc.c: proc files for key database enumeration
+/* procfs files for key database enumeration
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
@@ -60,9 +60,8 @@ static const struct file_operations proc_key_users_fops = {
.release = seq_release,
};
-/*****************************************************************************/
/*
- * declare the /proc files
+ * Declare the /proc files.
*/
static int __init key_proc_init(void)
{
@@ -79,14 +78,13 @@ static int __init key_proc_init(void)
panic("Cannot create /proc/key-users\n");
return 0;
-
-} /* end key_proc_init() */
+}
__initcall(key_proc_init);
-/*****************************************************************************/
/*
- * implement "/proc/keys" to provides a list of the keys on the system
+ * Implement "/proc/keys" to provide a list of the keys on the system that
+ * grant View permission to the caller.
*/
#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
@@ -293,9 +291,9 @@ static struct rb_node *key_user_first(struct rb_root *r)
return __key_user_next(n);
}
-/*****************************************************************************/
/*
- * implement "/proc/key-users" to provides a list of the key users
+ * Implement "/proc/key-users" to provides a list of the key users and their
+ * quotas.
*/
static int proc_key_users_open(struct inode *inode, struct file *file)
{
@@ -351,5 +349,4 @@ static int proc_key_users_show(struct seq_file *m, void *v)
maxbytes);
return 0;
-
}
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 504bdd2452bd..930634e45149 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -1,4 +1,4 @@
-/* Management of a process's keyrings
+/* Manage a process's keyrings
*
* Copyright (C) 2004-2005, 2008 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
@@ -21,13 +21,13 @@
#include <asm/uaccess.h>
#include "internal.h"
-/* session keyring create vs join semaphore */
+/* Session keyring create vs join semaphore */
static DEFINE_MUTEX(key_session_mutex);
-/* user keyring creation semaphore */
+/* User keyring creation semaphore */
static DEFINE_MUTEX(key_user_keyring_mutex);
-/* the root user's tracking struct */
+/* The root user's tracking struct */
struct key_user root_key_user = {
.usage = ATOMIC_INIT(3),
.cons_lock = __MUTEX_INITIALIZER(root_key_user.cons_lock),
@@ -38,9 +38,8 @@ struct key_user root_key_user = {
.user_ns = &init_user_ns,
};
-/*****************************************************************************/
/*
- * install user and user session keyrings for a particular UID
+ * Install the user and user session keyrings for the current process's UID.
*/
int install_user_keyrings(void)
{
@@ -122,7 +121,8 @@ error:
}
/*
- * install a fresh thread keyring directly to new credentials
+ * Install a fresh thread keyring directly to new credentials. This keyring is
+ * allowed to overrun the quota.
*/
int install_thread_keyring_to_cred(struct cred *new)
{
@@ -138,7 +138,7 @@ int install_thread_keyring_to_cred(struct cred *new)
}
/*
- * install a fresh thread keyring, discarding the old one
+ * Install a fresh thread keyring, discarding the old one.
*/
static int install_thread_keyring(void)
{
@@ -161,9 +161,10 @@ static int install_thread_keyring(void)
}
/*
- * install a process keyring directly to a credentials struct
- * - returns -EEXIST if there was already a process keyring, 0 if one installed,
- * and other -ve on any other error
+ * Install a process keyring directly to a credentials struct.
+ *
+ * Returns -EEXIST if there was already a process keyring, 0 if one installed,
+ * and other value on any other error
*/
int install_process_keyring_to_cred(struct cred *new)
{
@@ -192,8 +193,11 @@ int install_process_keyring_to_cred(struct cred *new)
}
/*
- * make sure a process keyring is installed
- * - we
+ * Make sure a process keyring is installed for the current process. The
+ * existing process keyring is not replaced.
+ *
+ * Returns 0 if there is a process keyring by the end of this function, some
+ * error otherwise.
*/
static int install_process_keyring(void)
{
@@ -214,7 +218,7 @@ static int install_process_keyring(void)
}
/*
- * install a session keyring directly to a credentials struct
+ * Install a session keyring directly to a credentials struct.
*/
int install_session_keyring_to_cred(struct cred *cred, struct key *keyring)
{
@@ -254,8 +258,8 @@ int install_session_keyring_to_cred(struct cred *cred, struct key *keyring)
}
/*
- * install a session keyring, discarding the old one
- * - if a keyring is not supplied, an empty one is invented
+ * Install a session keyring, discarding the old one. If a keyring is not
+ * supplied, an empty one is invented.
*/
static int install_session_keyring(struct key *keyring)
{
@@ -275,9 +279,8 @@ static int install_session_keyring(struct key *keyring)
return commit_creds(new);
}
-/*****************************************************************************/
/*
- * the filesystem user ID changed
+ * Handle the fsuid changing.
*/
void key_fsuid_changed(struct task_struct *tsk)
{
@@ -288,12 +291,10 @@ void key_fsuid_changed(struct task_struct *tsk)
tsk->cred->thread_keyring->uid = tsk->cred->fsuid;
up_write(&tsk->cred->thread_keyring->sem);
}
+}
-} /* end key_fsuid_changed() */
-
-/*****************************************************************************/
/*
- * the filesystem group ID changed
+ * Handle the fsgid changing.
*/
void key_fsgid_changed(struct task_struct *tsk)
{
@@ -304,16 +305,28 @@ void key_fsgid_changed(struct task_struct *tsk)
tsk->cred->thread_keyring->gid = tsk->cred->fsgid;
up_write(&tsk->cred->thread_keyring->sem);
}
+}
-} /* end key_fsgid_changed() */
-
-/*****************************************************************************/
/*
- * search only my process keyrings for the first matching key
- * - we use the supplied match function to see if the description (or other
- * feature of interest) matches
- * - we return -EAGAIN if we didn't find any matching key
- * - we return -ENOKEY if we found only negative matching keys
+ * Search the process keyrings attached to the supplied cred for the first
+ * matching key.
+ *
+ * The search criteria are the type and the match function. The description is
+ * given to the match function as a parameter, but doesn't otherwise influence
+ * the search. Typically the match function will compare the description
+ * parameter to the key's description.
+ *
+ * This can only search keyrings that grant Search permission to the supplied
+ * credentials. Keyrings linked to searched keyrings will also be searched if
+ * they grant Search permission too. Keys can only be found if they grant
+ * Search permission to the credentials.
+ *
+ * Returns a pointer to the key with the key usage count incremented if
+ * successful, -EAGAIN if we didn't find any matching key or -ENOKEY if we only
+ * matched negative keys.
+ *
+ * In the case of a successful return, the possession attribute is set on the
+ * returned key reference.
*/
key_ref_t search_my_process_keyrings(struct key_type *type,
const void *description,
@@ -428,13 +441,13 @@ found:
return key_ref;
}
-/*****************************************************************************/
/*
- * search the process keyrings for the first matching key
- * - we use the supplied match function to see if the description (or other
- * feature of interest) matches
- * - we return -EAGAIN if we didn't find any matching key
- * - we return -ENOKEY if we found only negative matching keys
+ * Search the process keyrings attached to the supplied cred for the first
+ * matching key in the manner of search_my_process_keyrings(), but also search
+ * the keys attached to the assumed authorisation key using its credentials if
+ * one is available.
+ *
+ * Return same as search_my_process_keyrings().
*/
key_ref_t search_process_keyrings(struct key_type *type,
const void *description,
@@ -489,24 +502,33 @@ key_ref_t search_process_keyrings(struct key_type *type,
found:
return key_ref;
+}
-} /* end search_process_keyrings() */
-
-/*****************************************************************************/
/*
- * see if the key we're looking at is the target key
+ * See if the key we're looking at is the target key.
*/
int lookup_user_key_possessed(const struct key *key, const void *target)
{
return key == target;
+}
-} /* end lookup_user_key_possessed() */
-
-/*****************************************************************************/
/*
- * lookup a key given a key ID from userspace with a given permissions mask
- * - don't create special keyrings unless so requested
- * - partially constructed keys aren't found unless requested
+ * Look up a key ID given us by userspace with a given permissions mask to get
+ * the key it refers to.
+ *
+ * Flags can be passed to request that special keyrings be created if referred
+ * to directly, to permit partially constructed keys to be found and to skip
+ * validity and permission checks on the found key.
+ *
+ * Returns a pointer to the key with an incremented usage count if successful;
+ * -EINVAL if the key ID is invalid; -ENOKEY if the key ID does not correspond
+ * to a key or the best found key was a negative key; -EKEYREVOKED or
+ * -EKEYEXPIRED if the best found key was revoked or expired; -EACCES if the
+ * found key doesn't grant the requested permit or the LSM denied access to it;
+ * or -ENOMEM if a special keyring couldn't be created.
+ *
+ * In the case of a successful return, the possession attribute is set on the
+ * returned key reference.
*/
key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
key_perm_t perm)
@@ -711,15 +733,18 @@ invalid_key:
reget_creds:
put_cred(cred);
goto try_again;
+}
-} /* end lookup_user_key() */
-
-/*****************************************************************************/
/*
- * join the named keyring as the session keyring if possible, or attempt to
- * create a new one of that name if not
- * - if the name is NULL, an empty anonymous keyring is installed instead
- * - named session keyring joining is done with a semaphore held
+ * Join the named keyring as the session keyring if possible else attempt to
+ * create a new one of that name and join that.
+ *
+ * If the name is NULL, an empty anonymous keyring will be installed as the
+ * session keyring.
+ *
+ * Named session keyrings are joined with a semaphore held to prevent the
+ * keyrings from going away whilst the attempt is made to going them and also
+ * to prevent a race in creating compatible session keyrings.
*/
long join_session_keyring(const char *name)
{
@@ -791,8 +816,8 @@ error:
}
/*
- * Replace a process's session keyring when that process resumes userspace on
- * behalf of one of its children
+ * Replace a process's session keyring on behalf of one of its children when
+ * the target process is about to resume userspace execution.
*/
void key_replace_session_keyring(void)
{
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 0ea52d25a6bd..a3dc0d460def 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -39,8 +39,14 @@ static int key_wait_bit_intr(void *flags)
return signal_pending(current) ? -ERESTARTSYS : 0;
}
-/*
- * call to complete the construction of a key
+/**
+ * complete_request_key - Complete the construction of a key.
+ * @cons: The key construction record.
+ * @error: The success or failute of the construction.
+ *
+ * Complete the attempt to construct a key. The key will be negated
+ * if an error is indicated. The authorisation key will be revoked
+ * unconditionally.
*/
void complete_request_key(struct key_construction *cons, int error)
{
@@ -58,23 +64,33 @@ void complete_request_key(struct key_construction *cons, int error)
}
EXPORT_SYMBOL(complete_request_key);
+/*
+ * Initialise a usermode helper that is going to have a specific session
+ * keyring.
+ *
+ * This is called in context of freshly forked kthread before kernel_execve(),
+ * so we can simply install the desired session_keyring at this point.
+ */
static int umh_keys_init(struct subprocess_info *info)
{
struct cred *cred = (struct cred*)current_cred();
struct key *keyring = info->data;
- /*
- * This is called in context of freshly forked kthread before
- * kernel_execve(), we can just change our ->session_keyring.
- */
+
return install_session_keyring_to_cred(cred, keyring);
}
+/*
+ * Clean up a usermode helper with session keyring.
+ */
static void umh_keys_cleanup(struct subprocess_info *info)
{
struct key *keyring = info->data;
key_put(keyring);
}
+/*
+ * Call a usermode helper with a specific session keyring.
+ */
static int call_usermodehelper_keys(char *path, char **argv, char **envp,
struct key *session_keyring, enum umh_wait wait)
{
@@ -91,7 +107,7 @@ static int call_usermodehelper_keys(char *path, char **argv, char **envp,
}
/*
- * request userspace finish the construction of a key
+ * Request userspace finish the construction of a key
* - execute "/sbin/request-key <op> <key> <uid> <gid> <keyring> <keyring> <keyring>"
*/
static int call_sbin_request_key(struct key_construction *cons,
@@ -198,8 +214,9 @@ error_alloc:
}
/*
- * call out to userspace for key construction
- * - we ignore program failure and go on key status instead
+ * Call out to userspace for key construction.
+ *
+ * Program failure is ignored in favour of key status.
*/
static int construct_key(struct key *key, const void *callout_info,
size_t callout_len, void *aux,
@@ -246,9 +263,10 @@ static int construct_key(struct key *key, const void *callout_info,
}
/*
- * get the appropriate destination keyring for the request
- * - we return whatever keyring we select with an extra reference upon it which
- * the caller must release
+ * Get the appropriate destination keyring for the request.
+ *
+ * The keyring selected is returned with an extra reference upon it which the
+ * caller must release.
*/
static void construct_get_dest_keyring(struct key **_dest_keyring)
{
@@ -321,9 +339,11 @@ static void construct_get_dest_keyring(struct key **_dest_keyring)
}
/*
- * allocate a new key in under-construction state and attempt to link it in to
- * the requested place
- * - may return a key that's already under construction instead
+ * Allocate a new key in under-construction state and attempt to link it in to
+ * the requested keyring.
+ *
+ * May return a key that's already under construction instead if there was a
+ * race between two thread calling request_key().
*/
static int construct_alloc_key(struct key_type *type,
const char *description,
@@ -332,8 +352,8 @@ static int construct_alloc_key(struct key_type *type,
struct key_user *user,
struct key **_key)
{
- struct keyring_list *prealloc;
const struct cred *cred = current_cred();
+ unsigned long prealloc;
struct key *key;
key_ref_t key_ref;
int ret;
@@ -414,7 +434,7 @@ alloc_failed:
}
/*
- * commence key construction
+ * Commence key construction.
*/
static struct key *construct_key_and_link(struct key_type *type,
const char *description,
@@ -465,12 +485,32 @@ construction_failed:
return ERR_PTR(ret);
}
-/*
- * request a key
- * - search the process's keyrings
- * - check the list of keys being created or updated
- * - call out to userspace for a key if supplementary info was provided
- * - cache the key in an appropriate keyring
+/**
+ * request_key_and_link - Request a key and cache it in a keyring.
+ * @type: The type of key we want.
+ * @description: The searchable description of the key.
+ * @callout_info: The data to pass to the instantiation upcall (or NULL).
+ * @callout_len: The length of callout_info.
+ * @aux: Auxiliary data for the upcall.
+ * @dest_keyring: Where to cache the key.
+ * @flags: Flags to key_alloc().
+ *
+ * A key matching the specified criteria is searched for in the process's
+ * keyrings and returned with its usage count incremented if found. Otherwise,
+ * if callout_info is not NULL, a key will be allocated and some service
+ * (probably in userspace) will be asked to instantiate it.
+ *
+ * If successfully found or created, the key will be linked to the destination
+ * keyring if one is provided.
+ *
+ * Returns a pointer to the key if successful; -EACCES, -ENOKEY, -EKEYREVOKED
+ * or -EKEYEXPIRED if an inaccessible, negative, revoked or expired key was
+ * found; -ENOKEY if no key was found and no @callout_info was given; -EDQUOT
+ * if insufficient key quota was available to create a new key; or -ENOMEM if
+ * insufficient memory was available.
+ *
+ * If the returned key was created, then it may still be under construction,
+ * and wait_for_key_construction() should be used to wait for that to complete.
*/
struct key *request_key_and_link(struct key_type *type,
const char *description,
@@ -524,8 +564,16 @@ error:
return key;
}
-/*
- * wait for construction of a key to complete
+/**
+ * wait_for_key_construction - Wait for construction of a key to complete
+ * @key: The key being waited for.
+ * @intr: Whether to wait interruptibly.
+ *
+ * Wait for a key to finish being constructed.
+ *
+ * Returns 0 if successful; -ERESTARTSYS if the wait was interrupted; -ENOKEY
+ * if the key was negated; or -EKEYREVOKED or -EKEYEXPIRED if the key was
+ * revoked or expired.
*/
int wait_for_key_construction(struct key *key, bool intr)
{
@@ -542,12 +590,19 @@ int wait_for_key_construction(struct key *key, bool intr)
}
EXPORT_SYMBOL(wait_for_key_construction);
-/*
- * request a key
- * - search the process's keyrings
- * - check the list of keys being created or updated
- * - call out to userspace for a key if supplementary info was provided
- * - waits uninterruptible for creation to complete
+/**
+ * request_key - Request a key and wait for construction
+ * @type: Type of key.
+ * @description: The searchable description of the key.
+ * @callout_info: The data to pass to the instantiation upcall (or NULL).
+ *
+ * As for request_key_and_link() except that it does not add the returned key
+ * to a keyring if found, new keys are always allocated in the user's quota,
+ * the callout_info must be a NUL-terminated string and no auxiliary data can
+ * be passed.
+ *
+ * Furthermore, it then works as wait_for_key_construction() to wait for the
+ * completion of keys undergoing construction with a non-interruptible wait.
*/
struct key *request_key(struct key_type *type,
const char *description,
@@ -572,12 +627,19 @@ struct key *request_key(struct key_type *type,
}
EXPORT_SYMBOL(request_key);
-/*
- * request a key with auxiliary data for the upcaller
- * - search the process's keyrings
- * - check the list of keys being created or updated
- * - call out to userspace for a key if supplementary info was provided
- * - waits uninterruptible for creation to complete
+/**
+ * request_key_with_auxdata - Request a key with auxiliary data for the upcaller
+ * @type: The type of key we want.
+ * @description: The searchable description of the key.
+ * @callout_info: The data to pass to the instantiation upcall (or NULL).
+ * @callout_len: The length of callout_info.
+ * @aux: Auxiliary data for the upcall.
+ *
+ * As for request_key_and_link() except that it does not add the returned key
+ * to a keyring if found and new keys are always allocated in the user's quota.
+ *
+ * Furthermore, it then works as wait_for_key_construction() to wait for the
+ * completion of keys undergoing construction with a non-interruptible wait.
*/
struct key *request_key_with_auxdata(struct key_type *type,
const char *description,
@@ -602,10 +664,18 @@ struct key *request_key_with_auxdata(struct key_type *type,
EXPORT_SYMBOL(request_key_with_auxdata);
/*
- * request a key (allow async construction)
- * - search the process's keyrings
- * - check the list of keys being created or updated
- * - call out to userspace for a key if supplementary info was provided
+ * request_key_async - Request a key (allow async construction)
+ * @type: Type of key.
+ * @description: The searchable description of the key.
+ * @callout_info: The data to pass to the instantiation upcall (or NULL).
+ * @callout_len: The length of callout_info.
+ *
+ * As for request_key_and_link() except that it does not add the returned key
+ * to a keyring if found, new keys are always allocated in the user's quota and
+ * no auxiliary data can be passed.
+ *
+ * The caller should call wait_for_key_construction() to wait for the
+ * completion of the returned key if it is still undergoing construction.
*/
struct key *request_key_async(struct key_type *type,
const char *description,
@@ -620,9 +690,17 @@ EXPORT_SYMBOL(request_key_async);
/*
* request a key with auxiliary data for the upcaller (allow async construction)
- * - search the process's keyrings
- * - check the list of keys being created or updated
- * - call out to userspace for a key if supplementary info was provided
+ * @type: Type of key.
+ * @description: The searchable description of the key.
+ * @callout_info: The data to pass to the instantiation upcall (or NULL).
+ * @callout_len: The length of callout_info.
+ * @aux: Auxiliary data for the upcall.
+ *
+ * As for request_key_and_link() except that it does not add the returned key
+ * to a keyring if found and new keys are always allocated in the user's quota.
+ *
+ * The caller should call wait_for_key_construction() to wait for the
+ * completion of the returned key if it is still undergoing construction.
*/
struct key *request_key_async_with_auxdata(struct key_type *type,
const char *description,
diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index 86747151ee5b..68164031a74e 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -1,4 +1,4 @@
-/* request_key_auth.c: request key authorisation controlling key def
+/* Request key authorisation token key definition.
*
* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
@@ -26,7 +26,7 @@ static void request_key_auth_destroy(struct key *);
static long request_key_auth_read(const struct key *, char __user *, size_t);
/*
- * the request-key authorisation key type definition
+ * The request-key authorisation key type definition.
*/
struct key_type key_type_request_key_auth = {
.name = ".request_key_auth",
@@ -38,9 +38,8 @@ struct key_type key_type_request_key_auth = {
.read = request_key_auth_read,
};
-/*****************************************************************************/
/*
- * instantiate a request-key authorisation key
+ * Instantiate a request-key authorisation key.
*/
static int request_key_auth_instantiate(struct key *key,
const void *data,
@@ -48,12 +47,10 @@ static int request_key_auth_instantiate(struct key *key,
{
key->payload.data = (struct request_key_auth *) data;
return 0;
+}
-} /* end request_key_auth_instantiate() */
-
-/*****************************************************************************/
/*
- * reading a request-key authorisation key retrieves the callout information
+ * Describe an authorisation token.
*/
static void request_key_auth_describe(const struct key *key,
struct seq_file *m)
@@ -63,12 +60,10 @@ static void request_key_auth_describe(const struct key *key,
seq_puts(m, "key:");
seq_puts(m, key->description);
seq_printf(m, " pid:%d ci:%zu", rka->pid, rka->callout_len);
+}
-} /* end request_key_auth_describe() */
-
-/*****************************************************************************/
/*
- * read the callout_info data
+ * Read the callout_info data (retrieves the callout information).
* - the key's semaphore is read-locked
*/
static long request_key_auth_read(const struct key *key,
@@ -91,13 +86,12 @@ static long request_key_auth_read(const struct key *key,
}
return ret;
+}
-} /* end request_key_auth_read() */
-
-/*****************************************************************************/
/*
- * handle revocation of an authorisation token key
- * - called with the key sem write-locked
+ * Handle revocation of an authorisation token key.
+ *
+ * Called with the key sem write-locked.
*/
static void request_key_auth_revoke(struct key *key)
{
@@ -109,12 +103,10 @@ static void request_key_auth_revoke(struct key *key)
put_cred(rka->cred);
rka->cred = NULL;
}
+}
-} /* end request_key_auth_revoke() */
-
-/*****************************************************************************/
/*
- * destroy an instantiation authorisation token key
+ * Destroy an instantiation authorisation token key.
*/
static void request_key_auth_destroy(struct key *key)
{
@@ -131,13 +123,11 @@ static void request_key_auth_destroy(struct key *key)
key_put(rka->dest_keyring);
kfree(rka->callout_info);
kfree(rka);
+}
-} /* end request_key_auth_destroy() */
-
-/*****************************************************************************/
/*
- * create an authorisation token for /sbin/request-key or whoever to gain
- * access to the caller's security data
+ * Create an authorisation token for /sbin/request-key or whoever to gain
+ * access to the caller's security data.
*/
struct key *request_key_auth_new(struct key *target, const void *callout_info,
size_t callout_len, struct key *dest_keyring)
@@ -228,12 +218,10 @@ error_alloc:
kfree(rka);
kleave("= %d", ret);
return ERR_PTR(ret);
+}
-} /* end request_key_auth_new() */
-
-/*****************************************************************************/
/*
- * see if an authorisation key is associated with a particular key
+ * See if an authorisation key is associated with a particular key.
*/
static int key_get_instantiation_authkey_match(const struct key *key,
const void *_id)
@@ -242,16 +230,11 @@ static int key_get_instantiation_authkey_match(const struct key *key,
key_serial_t id = (key_serial_t)(unsigned long) _id;
return rka->target_key->serial == id;
+}
-} /* end key_get_instantiation_authkey_match() */
-
-/*****************************************************************************/
/*
- * get the authorisation key for instantiation of a specific key if attached to
- * the current process's keyrings
- * - this key is inserted into a keyring and that is set as /sbin/request-key's
- * session keyring
- * - a target_id of zero specifies any valid token
+ * Search the current process's keyrings for the authorisation key for
+ * instantiation of a key.
*/
struct key *key_get_instantiation_authkey(key_serial_t target_id)
{
@@ -278,5 +261,4 @@ struct key *key_get_instantiation_authkey(key_serial_t target_id)
error:
return authkey;
-
-} /* end key_get_instantiation_authkey() */
+}
diff --git a/security/keys/trusted_defined.c b/security/keys/trusted.c
index 975e9f29a52c..83fc92e297cd 100644
--- a/security/keys/trusted_defined.c
+++ b/security/keys/trusted.c
@@ -29,7 +29,7 @@
#include <linux/tpm.h>
#include <linux/tpm_command.h>
-#include "trusted_defined.h"
+#include "trusted.h"
static const char hmac_alg[] = "hmac(sha1)";
static const char hash_alg[] = "sha1";
@@ -101,11 +101,13 @@ static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
if (dlen == 0)
break;
data = va_arg(argp, unsigned char *);
- if (data == NULL)
- return -EINVAL;
+ if (data == NULL) {
+ ret = -EINVAL;
+ break;
+ }
ret = crypto_shash_update(&sdesc->shash, data, dlen);
if (ret < 0)
- goto out;
+ break;
}
va_end(argp);
if (!ret)
@@ -146,14 +148,17 @@ static int TSS_authhmac(unsigned char *digest, const unsigned char *key,
if (dlen == 0)
break;
data = va_arg(argp, unsigned char *);
- ret = crypto_shash_update(&sdesc->shash, data, dlen);
- if (ret < 0) {
- va_end(argp);
- goto out;
+ if (!data) {
+ ret = -EINVAL;
+ break;
}
+ ret = crypto_shash_update(&sdesc->shash, data, dlen);
+ if (ret < 0)
+ break;
}
va_end(argp);
- ret = crypto_shash_final(&sdesc->shash, paramdigest);
+ if (!ret)
+ ret = crypto_shash_final(&sdesc->shash, paramdigest);
if (!ret)
ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE,
paramdigest, TPM_NONCE_SIZE, h1,
@@ -222,13 +227,12 @@ static int TSS_checkhmac1(unsigned char *buffer,
break;
dpos = va_arg(argp, unsigned int);
ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen);
- if (ret < 0) {
- va_end(argp);
- goto out;
- }
+ if (ret < 0)
+ break;
}
va_end(argp);
- ret = crypto_shash_final(&sdesc->shash, paramdigest);
+ if (!ret)
+ ret = crypto_shash_final(&sdesc->shash, paramdigest);
if (ret < 0)
goto out;
@@ -316,13 +320,12 @@ static int TSS_checkhmac2(unsigned char *buffer,
break;
dpos = va_arg(argp, unsigned int);
ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen);
- if (ret < 0) {
- va_end(argp);
- goto out;
- }
+ if (ret < 0)
+ break;
}
va_end(argp);
- ret = crypto_shash_final(&sdesc->shash, paramdigest);
+ if (!ret)
+ ret = crypto_shash_final(&sdesc->shash, paramdigest);
if (ret < 0)
goto out;
@@ -511,7 +514,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
/* get session for sealing key */
ret = osap(tb, &sess, keyauth, keytype, keyhandle);
if (ret < 0)
- return ret;
+ goto out;
dump_sess(&sess);
/* calculate encrypted authorization value */
@@ -519,11 +522,11 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
memcpy(td->xorwork + SHA1_DIGEST_SIZE, sess.enonce, SHA1_DIGEST_SIZE);
ret = TSS_sha1(td->xorwork, SHA1_DIGEST_SIZE * 2, td->xorhash);
if (ret < 0)
- return ret;
+ goto out;
ret = tpm_get_random(tb, td->nonceodd, TPM_NONCE_SIZE);
if (ret < 0)
- return ret;
+ goto out;
ordinal = htonl(TPM_ORD_SEAL);
datsize = htonl(datalen);
pcrsize = htonl(pcrinfosize);
@@ -552,7 +555,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
&datsize, datalen, data, 0, 0);
}
if (ret < 0)
- return ret;
+ goto out;
/* build and send the TPM request packet */
INIT_BUF(tb);
@@ -572,7 +575,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE);
if (ret < 0)
- return ret;
+ goto out;
/* calculate the size of the returned Blob */
sealinfosize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t));
@@ -591,6 +594,8 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize);
*bloblen = storedsize;
}
+out:
+ kfree(td);
return ret;
}
@@ -1027,6 +1032,7 @@ static int trusted_update(struct key *key, const void *data, size_t datalen)
ret = datablob_parse(datablob, new_p, new_o);
if (ret != Opt_update) {
ret = -EINVAL;
+ kfree(new_p);
goto out;
}
/* copy old key values, and reseal with new pcrs */
diff --git a/security/keys/trusted_defined.h b/security/keys/trusted.h
index 3249fbd2b653..3249fbd2b653 100644
--- a/security/keys/trusted_defined.h
+++ b/security/keys/trusted.h
diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index e9aa07929656..02807fb16340 100644
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -35,7 +35,6 @@ struct key_type key_type_user = {
EXPORT_SYMBOL_GPL(key_type_user);
-/*****************************************************************************/
/*
* instantiate a user defined key
*/
@@ -65,12 +64,10 @@ int user_instantiate(struct key *key, const void *data, size_t datalen)
error:
return ret;
-
-} /* end user_instantiate() */
+}
EXPORT_SYMBOL_GPL(user_instantiate);
-/*****************************************************************************/
/*
* dispose of the old data from an updated user defined key
*/
@@ -81,10 +78,8 @@ static void user_update_rcu_disposal(struct rcu_head *rcu)
upayload = container_of(rcu, struct user_key_payload, rcu);
kfree(upayload);
+}
-} /* end user_update_rcu_disposal() */
-
-/*****************************************************************************/
/*
* update a user defined key
* - the key's semaphore is write-locked
@@ -123,24 +118,20 @@ int user_update(struct key *key, const void *data, size_t datalen)
error:
return ret;
-
-} /* end user_update() */
+}
EXPORT_SYMBOL_GPL(user_update);
-/*****************************************************************************/
/*
* match users on their name
*/
int user_match(const struct key *key, const void *description)
{
return strcmp(key->description, description) == 0;
-
-} /* end user_match() */
+}
EXPORT_SYMBOL_GPL(user_match);
-/*****************************************************************************/
/*
* dispose of the links from a revoked keyring
* - called with the key sem write-locked
@@ -156,12 +147,10 @@ void user_revoke(struct key *key)
rcu_assign_pointer(key->payload.data, NULL);
call_rcu(&upayload->rcu, user_update_rcu_disposal);
}
-
-} /* end user_revoke() */
+}
EXPORT_SYMBOL(user_revoke);
-/*****************************************************************************/
/*
* dispose of the data dangling from the corpse of a user key
*/
@@ -170,12 +159,10 @@ void user_destroy(struct key *key)
struct user_key_payload *upayload = key->payload.data;
kfree(upayload);
-
-} /* end user_destroy() */
+}
EXPORT_SYMBOL_GPL(user_destroy);
-/*****************************************************************************/
/*
* describe the user key
*/
@@ -184,12 +171,10 @@ void user_describe(const struct key *key, struct seq_file *m)
seq_puts(m, key->description);
seq_printf(m, ": %u", key->datalen);
-
-} /* end user_describe() */
+}
EXPORT_SYMBOL_GPL(user_describe);
-/*****************************************************************************/
/*
* read the key data
* - the key's semaphore is read-locked
@@ -213,7 +198,6 @@ long user_read(const struct key *key, char __user *buffer, size_t buflen)
}
return ret;
-
-} /* end user_read() */
+}
EXPORT_SYMBOL_GPL(user_read);
diff --git a/security/security.c b/security/security.c
index b84a89dd59c6..1a4993b11446 100644
--- a/security/security.c
+++ b/security/security.c
@@ -154,10 +154,9 @@ int security_capset(struct cred *new, const struct cred *old,
effective, inheritable, permitted);
}
-int security_capable(int cap)
+int security_capable(const struct cred *cred, int cap)
{
- return security_ops->capable(current, current_cred(), cap,
- SECURITY_CAP_AUDIT);
+ return security_ops->capable(current, cred, cap, SECURITY_CAP_AUDIT);
}
int security_real_capable(struct task_struct *tsk, int cap)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index e276eb468536..c8d699270687 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3198,7 +3198,11 @@ static void selinux_cred_free(struct cred *cred)
{
struct task_security_struct *tsec = cred->security;
- BUG_ON((unsigned long) cred->security < PAGE_SIZE);
+ /*
+ * cred->security == NULL if security_cred_alloc_blank() or
+ * security_prepare_creds() returned an error.
+ */
+ BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE);
cred->security = (void *) 0x7UL;
kfree(tsec);
}
diff --git a/security/selinux/include/avc.h b/security/selinux/include/avc.h
index e94e82f73818..5615081b73ec 100644
--- a/security/selinux/include/avc.h
+++ b/security/selinux/include/avc.h
@@ -15,7 +15,6 @@
#include <linux/audit.h>
#include <linux/lsm_audit.h>
#include <linux/in6.h>
-#include <linux/path.h>
#include <asm/system.h>
#include "flask.h"
#include "av_permissions.h"
diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c
index c3f845cbcd48..a53373207fb4 100644
--- a/security/selinux/ss/conditional.c
+++ b/security/selinux/ss/conditional.c
@@ -178,7 +178,7 @@ int cond_init_bool_indexes(struct policydb *p)
p->bool_val_to_struct = (struct cond_bool_datum **)
kmalloc(p->p_bools.nprim * sizeof(struct cond_bool_datum *), GFP_KERNEL);
if (!p->bool_val_to_struct)
- return -1;
+ return -ENOMEM;
return 0;
}
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index be9de3872837..57363562f0f8 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -501,8 +501,8 @@ static int policydb_index(struct policydb *p)
if (rc)
goto out;
- rc = -ENOMEM;
- if (cond_init_bool_indexes(p))
+ rc = cond_init_bool_indexes(p);
+ if (rc)
goto out;
for (i = 0; i < SYM_NUM; i++) {

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