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authorJames Morris <jmorris@redhat.com>2005-07-28 01:07:37 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-28 08:39:02 -0700
commitf5c1d5b2aaf9a98f15a6dcdfbba1f494d0aaae52 (patch)
treee896d0b6b9f561c9d124fa81efd261518ccbddf4 /security/selinux/ss/services.c
parente1699f508ab5098de4b258268fa8913db38d9d35 (diff)
[PATCH] SELinux: default labeling of MLS field
Implement kernel labeling of the MLS (multilevel security) field of security contexts for files which have no existing MLS field. This is to enable upgrades of a system from non-MLS to MLS without performing a full filesystem relabel including all of the mountpoints, which would be quite painful for users. With this patch, with MLS enabled, if a file has no MLS field, the kernel internally adds an MLS field to the in-core inode (but not to the on-disk file). This MLS field added is the default for the superblock, allowing per-mountpoint control over the values via fixed policy or mount options. This patch has been tested by enabling MLS without relabeling its filesystem, and seems to be working correctly. Signed-off-by: James Morris <jmorris@redhat.com> Signed-off-by: Stephen Smalley <sds@epoch.ncsc.mil> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security/selinux/ss/services.c')
-rw-r--r--security/selinux/ss/services.c55
1 files changed, 42 insertions, 13 deletions
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 922bb45054aa..014120474e69 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -601,18 +601,7 @@ out:
}
-/**
- * security_context_to_sid - Obtain a SID for a given security context.
- * @scontext: security context
- * @scontext_len: length in bytes
- * @sid: security identifier, SID
- *
- * Obtains a SID associated with the security context that
- * has the string representation specified by @scontext.
- * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
- * memory is available, or 0 on success.
- */
-int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
+static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid)
{
char *scontext2;
struct context context;
@@ -703,7 +692,7 @@ int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
context.type = typdatum->value;
- rc = mls_context_to_sid(oldc, &p, &context);
+ rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid);
if (rc)
goto out_unlock;
@@ -727,6 +716,46 @@ out:
return rc;
}
+/**
+ * security_context_to_sid - Obtain a SID for a given security context.
+ * @scontext: security context
+ * @scontext_len: length in bytes
+ * @sid: security identifier, SID
+ *
+ * Obtains a SID associated with the security context that
+ * has the string representation specified by @scontext.
+ * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
+ * memory is available, or 0 on success.
+ */
+int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
+{
+ return security_context_to_sid_core(scontext, scontext_len,
+ sid, SECSID_NULL);
+}
+
+/**
+ * security_context_to_sid_default - Obtain a SID for a given security context,
+ * falling back to specified default if needed.
+ *
+ * @scontext: security context
+ * @scontext_len: length in bytes
+ * @sid: security identifier, SID
+ * @def_sid: default SID to assign on errror
+ *
+ * Obtains a SID associated with the security context that
+ * has the string representation specified by @scontext.
+ * The default SID is passed to the MLS layer to be used to allow
+ * kernel labeling of the MLS field if the MLS field is not present
+ * (for upgrading to MLS without full relabel).
+ * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
+ * memory is available, or 0 on success.
+ */
+int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid)
+{
+ return security_context_to_sid_core(scontext, scontext_len,
+ sid, def_sid);
+}
+
static int compute_sid_handle_invalid_context(
struct context *scontext,
struct context *tcontext,

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