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authorLinus Torvalds <torvalds@linux-foundation.org>2020-08-04 14:20:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-04 14:20:26 -0700
commitfd76a74d940ae3d6b8b2395cd12914630c7e1739 (patch)
tree6ebff780642f5db3039ee5385c2dbb5c21b7a144 /kernel/audit.c
parent49e917deeb81e263bcdb4b20e61ca18111995ffe (diff)
parentb43870c74f3fdf0cd06bf5f1b7a5ed70a2cd4ed2 (diff)
Merge tag 'audit-pr-20200803' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
Pull audit updates from Paul Moore: "Aside from some smaller bug fixes, here are the highlights: - add a new backlog wait metric to the audit status message, this is intended to help admins determine how long processes have been waiting for the audit backlog queue to clear - generate audit records for nftables configuration changes - generate CWD audit records for for the relevant LSM audit records" * tag 'audit-pr-20200803' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit: audit: report audit wait metric in audit status reply audit: purge audit_log_string from the intra-kernel audit API audit: issue CWD record to accompany LSM_AUDIT_DATA_* records audit: use the proper gfp flags in the audit_log_nfcfg() calls audit: remove unused !CONFIG_AUDITSYSCALL __audit_inode* stubs audit: add gfp parameter to audit_log_nfcfg audit: log nftables configuration change events audit: Use struct_size() helper in alloc_chunk
Diffstat (limited to 'kernel/audit.c')
-rw-r--r--kernel/audit.c39
1 files changed, 27 insertions, 12 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 4e8082eb7516..7efaece534a9 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -136,6 +136,11 @@ u32 audit_sig_sid = 0;
*/
static atomic_t audit_lost = ATOMIC_INIT(0);
+/* Monotonically increasing sum of time the kernel has spent
+ * waiting while the backlog limit is exceeded.
+ */
+static atomic_t audit_backlog_wait_time_actual = ATOMIC_INIT(0);
+
/* Hash for inode-based rules */
struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
@@ -1201,17 +1206,18 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_GET: {
struct audit_status s;
memset(&s, 0, sizeof(s));
- s.enabled = audit_enabled;
- s.failure = audit_failure;
+ s.enabled = audit_enabled;
+ s.failure = audit_failure;
/* NOTE: use pid_vnr() so the PID is relative to the current
* namespace */
- s.pid = auditd_pid_vnr();
- s.rate_limit = audit_rate_limit;
- s.backlog_limit = audit_backlog_limit;
- s.lost = atomic_read(&audit_lost);
- s.backlog = skb_queue_len(&audit_queue);
- s.feature_bitmap = AUDIT_FEATURE_BITMAP_ALL;
- s.backlog_wait_time = audit_backlog_wait_time;
+ s.pid = auditd_pid_vnr();
+ s.rate_limit = audit_rate_limit;
+ s.backlog_limit = audit_backlog_limit;
+ s.lost = atomic_read(&audit_lost);
+ s.backlog = skb_queue_len(&audit_queue);
+ s.feature_bitmap = AUDIT_FEATURE_BITMAP_ALL;
+ s.backlog_wait_time = audit_backlog_wait_time;
+ s.backlog_wait_time_actual = atomic_read(&audit_backlog_wait_time_actual);
audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
break;
}
@@ -1315,6 +1321,12 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
audit_log_config_change("lost", 0, lost, 1);
return lost;
}
+ if (s.mask == AUDIT_STATUS_BACKLOG_WAIT_TIME_ACTUAL) {
+ u32 actual = atomic_xchg(&audit_backlog_wait_time_actual, 0);
+
+ audit_log_config_change("backlog_wait_time_actual", 0, actual, 1);
+ return actual;
+ }
break;
}
case AUDIT_GET_FEATURE:
@@ -1826,12 +1838,15 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
/* sleep if we are allowed and we haven't exhausted our
* backlog wait limit */
if (gfpflags_allow_blocking(gfp_mask) && (stime > 0)) {
+ long rtime = stime;
+
DECLARE_WAITQUEUE(wait, current);
add_wait_queue_exclusive(&audit_backlog_wait,
&wait);
set_current_state(TASK_UNINTERRUPTIBLE);
- stime = schedule_timeout(stime);
+ stime = schedule_timeout(rtime);
+ atomic_add(rtime - stime, &audit_backlog_wait_time_actual);
remove_wait_queue(&audit_backlog_wait, &wait);
} else {
if (audit_rate_check() && printk_ratelimit())
@@ -2079,13 +2094,13 @@ void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
/* We will allow 11 spaces for ' (deleted)' to be appended */
pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
if (!pathname) {
- audit_log_string(ab, "<no_memory>");
+ audit_log_format(ab, "\"<no_memory>\"");
return;
}
p = d_path(path, pathname, PATH_MAX+11);
if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
/* FIXME: can we save some information here? */
- audit_log_string(ab, "<too_long>");
+ audit_log_format(ab, "\"<too_long>\"");
} else
audit_log_untrustedstring(ab, p);
kfree(pathname);

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