9:43 p.m.
hi, Paul:
we got one kernel panic on 4.9 kernel
[16237.397896] [2018:10:09 23:06:55]audit: audit_pid=20802 reset
[16238.098916] [2018:10:09 23:06:57]Unable to handle kernel NULL pointer
dereference at virtual address 00000280
audit_sock is set to NULL in kauditd_send_skb, but later we are access it
again in audit_replace caused this panic.
is there patch for such SW issue on 4.9 kernel ?
static int audit_replace(pid_t pid)
{
struct sk_buff *skb = audit_make_reply(0, 0, AUDIT_REPLACE, 0, 0,
&pid, sizeof(pid));
if (!skb)
return -ENOMEM;
return netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
}
Br
kassey
11:15 p.m.
On October 11, 2018 10:44:01 PM Kassey Li <kasseyli(a)outlook.com> wrote:
hi, Paul:
we got one kernel panic on 4.9 kernel
[16237.397896] [2018:10:09 23:06:55]audit: audit_pid=20802 reset
[16238.098916] [2018:10:09 23:06:57]Unable to handle kernel NULL pointer
dereference at virtual address 00000280
audit_sock is set to NULL in kauditd_send_skb, but later we are access it
again in audit_replace caused this panic.
is there patch for such SW issue on 4.9 kernel ?
static int audit_replace(pid_t pid)
{
struct sk_buff *skb = audit_make_reply(0, 0, AUDIT_REPLACE, 0, 0,
&pid, sizeof(pid));
if (!skb)
return -ENOMEM;
return netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
}
Hi.
Have you been able to reproduce this problem on a recent kernel? Unfortunately there have
been some major changes to that area of the code since v4.9 and it is very likely that we
have fixed this issue in the current upstream kernel.
--
paul moore
www.paul-moore.com
2:33 a.m.
hi, Paul:
it is hard to running on upstream kernel on my hardware.
I checked the kernel log that we can see that we are trying to send the sock to task
20802, but it was killed already.
is there any suggest that we can pick up some patches to backport to 4.9 to try ?
[16222.577350] [2018:10:09 23:06:41]init: Service 'logd' (pid 20802) killed by
signal 11
[16237.397867] [2018:10:09 23:06:55]audit: netlink_unicast sending to audit_pid=20802
returned error: -111
-000|netlink_unicast(
| [X20] ssk = 0x0,
| [X21] skb = 0xFFFFFFC0989D5600,
| [X24] portid = 20802,
| [X19] nonblock = 0)
Kassey Li
________________________________
From: Paul Moore <paul(a)paul-moore.com>
Sent: October 12, 2018 12:15 PM
To: Kassey Li; Linux-audit(a)redhat.com
Subject: Re: 4.9 kernel panic in netlink unicast because audit replace passing audit sock
as NULL
On October 11, 2018 10:44:01 PM Kassey Li <kasseyli(a)outlook.com> wrote:
hi, Paul:
we got one kernel panic on 4.9 kernel
[16237.397896] [2018:10:09 23:06:55]audit: audit_pid=20802 reset
[16238.098916] [2018:10:09 23:06:57]Unable to handle kernel NULL pointer
dereference at virtual address 00000280
audit_sock is set to NULL in kauditd_send_skb, but later we are access it
again in audit_replace caused this panic.
is there patch for such SW issue on 4.9 kernel ?
static int audit_replace(pid_t pid)
{
struct sk_buff *skb = audit_make_reply(0, 0, AUDIT_REPLACE, 0, 0,
&pid, sizeof(pid));
if (!skb)
return -ENOMEM;
return netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
}
Hi.
Have you been able to reproduce this problem on a recent kernel? Unfortunately there have
been some major changes to that area of the code since v4.9 and it is very likely that we
have fixed this issue in the current upstream kernel.
--
paul moore
www.paul-moore.com<http://www.paul-moore.com>
10:57 a.m.
On Fri, Oct 12, 2018 at 3:33 AM Kassey Li <kasseyli(a)outlook.com> wrote:
hi, Paul:
it is hard to running on upstream kernel on my hardware.
I checked the kernel log that we can see that we are trying to send the sock to task
20802, but it was killed already.
is there any suggest that we can pick up some patches to backport to 4.9 to try ?
There have been numerous patches which could be applicable to your
problem, starting in v4.10 through v4.15. Since this is an old kernel
from an upstream community perspective I would suggest reaching out to
your Linux distribution's support channels to see if they can help
you. If that is not an option, you can see all of the audit patches
from the audit team in the audit kernel repo broken down by release at
the following location:
* git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit.git
* https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit.git
... patches for Linux vX.Y can be found in branches stable-X.Y.
--
paul moore
www.paul-moore.com
2261
days inactive
2262
days old
linux-audit@lists.linux-audit.osci.io
3 comments
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Paul Moore