linux-kernel - Re: 2.6.31-rc2: BUG: unable to handle kernel NULL pointer dereference

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 20 Jul 2009 21:23:54 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Parag Warudkar <parag.warudkar@...il.com>,
	linux-kernel@...r.kernel.org, sds@...ho.nsa.gov, jmorris@...ei.org,
	eparis@...isplace.org
Subject: Re: 2.6.31-rc2: BUG: unable to handle kernel NULL pointer
 dereference

Am Sonntag, den 12.07.2009, 22:26 +0200 schrieb Jiri Slaby:
> On 07/12/2009 07:30 PM, Parag Warudkar wrote:
> > static void selinux_write_opts(struct seq_file *m,
> > 1012                                struct security_mnt_opts *opts)
> > 1013 {
> > 1014         int i;
> > 1015         char *prefix;
> > 1016
> > 1017         for (i = 0; i < opts->num_mnt_opts; i++) {
> > 1018                 char *has_comma;
> > 1019
> > 1020                 if (opts->mnt_opts[i])
> > 1021                         has_comma = strchr(opts->mnt_opts[i], ',');
> >                                          ^^^^^^^^^^^^^^^^^^^^^^^^^
> > And that is a NULL pointer dereference - but we just checked for
> > opts->mnt_opts[i] for not NULL. 
> 
> Note, that there is not a NULL dereference. It dereferences 0x40 which
> came in as %rdi. Looks like somebody assigned garbage in there.
> 
> Or a single bit mem error. Is memtest OK with this machine?
Yes it ran fine for one cycle (about 2:15 hours).

Maybe memory in acpi S3 is not so stable? Is this possible?

> 
> What warning tainted the kernel before this oops is still interesting...

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/