Mario Lorenz wrote:
> All out of a sudden, our production web server crashes every other day.
> It was running fine on 2.0.35 for a long time, but script kiddies forced the
> upgrade to 2.0.38 and later to 2.0.39pre1 for the IP stack vulnerability to
> be patched.
>
> I was able to capture the ooopses as appended. Machine was rock solid and
> needed a hard reboot though.
>
> It is a Pentium 166, BusLogic SCSI, software RAID 1.
> Kernel is 2.0.38 plus .39pre1 plus the OpenWall noexec-
> stack (.38-ow4). The stack trace seem to point to the TCPIP layer, so
> we might be talking about some new DoS vulnerability here, since the problems
> started all out of the sudden.
I don't expect that many people will be looking at 2.0.3x bug reports
with knocking 2.4 into shape but you might want to try this patch.
Failing that, try enabling the IS_SKB(skb) check in sock_wfree()
(and possibly other places)to see if that sheds any more light on
things.
Paul.
--- linux-2.0.38/net/core/sock.c~ Mon Jul 24 14:25:11 2000
+++ linux-2.0.38/net/core/sock.c Mon Jul 24 14:30:31 2000
@@ -73,6 +73,7 @@
* Michael Pall : SO_ERROR returns positive errno again
* Elliot Poger : Added support for SO_BINDTODEVICE.
* Russell King : Add #ifdef CONFIG_INET to SO_BINDTODEVICE
+ * Paul Gortmaker : No write_space callback on dead socket.
*
* To Fix:
*
@@ -475,7 +476,8 @@
if (sk)
{
/* In case it might be waiting for more memory. */
- sk->write_space(sk);
+ if (!sk->dead)
+ sk->write_space(sk);
atomic_sub(s, &sk->wmem_alloc);
}
}
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This archive was generated by hypermail 2b29 : Tue Jul 25 2000 - 04:41:10 EDT