Re: Google Chrome generates many audit type 1326 messages

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On Thu, 2016-12-29 at 01:52 +0200, Alchemist wrote:
> 2016-12-28 14:44 GMT+02:00 Patrick O'Callaghan <pocallaghan@xxxxxxxxx>:
> 
> > On Tue, 2016-12-27 at 21:17 +0200, Alchemist wrote:
> > > 2016-12-27 21:00 GMT+02:00 Patrick O'Callaghan <pocallaghan@xxxxxxxxx>:
> > > 
> > > > On Tue, 2016-12-27 at 08:48 -0500, Tom Horsley wrote:
> > > > > On Tue, 27 Dec 2016 13:35:09 +0000
> > > > > Patrick O'Callaghan wrote:
> > > > > 
> > > > > > b) can be turned off?
> > > > > 
> > > > > Edit grub.cfg and put audit=0 on the kernel command line.
> > > > > Disable the auditd service.
> > > > > No more audit messages from anything :-).
> > > > 
> > > > Wasn't really the question. I want to know what it's telling me before
> > > > I decide whether to turn it off.
> > > > 
> > > > 
> > > > 
> > > 
> > > http://billauer.co.il/blog/2015/08/linux-google-chrome-aw-snap-seccomp/
> > 
> > Thanks, I had used ausearch to confirm these are SECCOMP errors, i.e.
> > problems with Chrome sandboxing (which apparently have been around for
> > a long time). However the URL above recommends just running Chrome
> > without the sandbox, which a) isn't a solution and b) is no longer
> > supported.
> > 
> > Now that I know what it is, I can just ignore the audit errors.
> > 
> > 
> 
> Yes, or you may add something like
> 
> -a exclude,always -F msgtype=1326
> or
> -a exclude,always -F exe=/opt/google/chrome/chrome
> 
> to /etc/audit/audit.rules
> systemctl restart auditd

systemctl doesn't work for this. You have to run "service restart auditd"

> see man auditctl
> 
> Because depending on Your Chrome usage, it could flood logs and make
> difficult to search something truly important.

I've tried the second version (excluding the executable) but I'm still getting floods of audit messages:

$ sudo auditctl exclude exe="/opt/google/chrome/chrome"
$ journal -e
Dec 29 11:53:42 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:53:42 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:53:51 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:53:51 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:00 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:00 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:09 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:09 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:20 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:20 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:27 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:27 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

Dec 29 11:54:39 bree audit[4208]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4208 comm="chrome" exe="/opt/google/chrome/chrome" sig=0 arch=c000003e syscall=2 compat=0 ip=0x7f6

etc. etc.

The audit documentation is not helpful. Any ideas?

poc
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