linux-kernel - [PATCH 2/6][RFC] audit: add arch field to seccomp event log

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Message-Id: <7f3959e9f2c971e91d63287518beb30aff56d917.1393974970.git.rgb@redhat.com>
Date:	Wed,  5 Mar 2014 16:27:03 -0500
From:	Richard Guy Briggs <rgb@...hat.com>
To:	linux-audit@...hat.com, linux-kernel@...r.kernel.org
Cc:	Richard Guy Briggs <rgb@...hat.com>, eparis@...hat.com,
	sgrubb@...hat.com, oleg@...hat.com,
	linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
	linux-ia64@...r.kernel.org, microblaze-uclinux@...e.uq.edu.au,
	linux-mips@...ux-mips.org, linux@...nrisc.net,
	linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-arch@...r.kernel.org
Subject: [PATCH 2/6][RFC] audit: add arch field to seccomp event log

The AUDIT_SECCOMP record looks something like this:

type=SECCOMP msg=audit(1373478171.953:32775): auid=4325 uid=4325 gid=4325 ses=1 subj=unconfined_u:unconfined_r:unconfined_t:s0 pid=12381 comm="test" sig=31 syscall=231 compat=0 ip=0x39ea8bca89 code=0x0

In order to determine what syscall 231 maps to, we need to have the arch= field right before it.

To see the event, compile this test.c program:

=====
int main(void)
{
        return seccomp_load(seccomp_init(SCMP_ACT_KILL));
}
=====

gcc -g test.c -o test -lseccomp

After running the program, find the record by:  ausearch --start recent -m SECCOMP -i

Signed-off-by: Richard Guy Briggs <rgb@...hat.com>

---
 kernel/auditsc.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 3bc12d2..7317f46 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -67,6 +67,7 @@
 #include <linux/binfmts.h>
 #include <linux/highmem.h>
 #include <linux/syscalls.h>
+#include <asm/syscall.h>
 #include <linux/capability.h>
 #include <linux/fs_struct.h>
 #include <linux/compat.h>
@@ -2415,6 +2416,8 @@ void __audit_seccomp(unsigned long syscall, long signr, int code)
 		return;
 	audit_log_task(ab);
 	audit_log_format(ab, " sig=%ld", signr);
+	audit_log_format(ab, " arch=%x",
+			 syscall_get_arch(current, task_pt_regs(current)));
 	audit_log_format(ab, " syscall=%ld", syscall);
 	audit_log_format(ab, " compat=%d", is_compat_task());
 	audit_log_format(ab, " ip=0x%lx", KSTK_EIP(current));
-- 
1.7.1

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