From: Tyler Hicks Date: Fri, 26 Jul 2013 01:02:55 +0000 (-0700) Subject: audit: printk USER_AVC messages when audit isn't enabled X-Git-Url: https://git.stricted.de/?p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git;a=commitdiff_plain;h=b1427212a66869dde67ab630a400bf69fce5dbc0 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 Cc: Al Viro Cc: Eric Paris Cc: linux-audit@redhat.com Acked-by: Kees Cook Signed-off-by: Richard Guy Briggs Signed-off-by: Eric Paris Signed-off-by: Greg Kroah-Hartman --- diff --git a/kernel/audit.c b/kernel/audit.c index 7b0e23a740ce..f5dc4b5db72e 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; }