This is a note to let you know that I have just added a patch titled audit: printk USER_AVC messages when audit isn't enabled to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/l... If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.11.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From: Tyler Hicks <tyhicks(a)canonical.com&gt; Date: Thu, 25 Jul 2013 18:02:55 -0700 Subject: audit: printk USER_AVC messages when audit isn't enabled commit 0868a5e150bc4c47e7a003367cd755811eb41e0b upstream. When the audit=1 kernel parameter is absent and auditd is not running, AUDIT_USER_AVC messages are being silently discarded. AUDIT_USER_AVC messages should be sent to userspace using printk(), as mentioned in the commit message of 4a4cd633 ("AUDIT: Optimise the audit-disabled case for discarding user messages"). When audit_enabled is 0, audit_receive_msg() discards all user messages except for AUDIT_USER_AVC messages. However, audit_log_common_recv_msg() refuses to allocate an audit_buffer if audit_enabled is 0. The fix is to special case AUDIT_USER_AVC messages in both functions. It looks like commit 50397bd1 ("[AUDIT] clean up audit_receive_msg()") introduced this bug. Signed-off-by: Tyler Hicks <tyhicks(a)canonical.com&gt; Cc: Al Viro <viro(a)zeniv.linux.org.uk&gt; Cc: Eric Paris <eparis(a)redhat.com&gt; Cc: linux-audit(a)redhat.com Acked-by: Kees Cook <keescook(a)chromium.org&gt; Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com&gt; Signed-off-by: Eric Paris <eparis(a)redhat.com&gt; Signed-off-by: Luis Henriques <luis.henriques(a)canonical.com&gt; --- kernel/audit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/audit.c b/kernel/audit.c index 7b0e23a..f5dc4b5 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -613,7 +613,7 @@ static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type) int rc = 0; uid_t uid = from_kuid(&init_user_ns, current_uid()); - if (!audit_enabled) { + if (!audit_enabled && msg_type != AUDIT_USER_AVC) { *ab = NULL; return rc; } -- 1.8.3.2