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Old 03-24-2009, 09:58 AM
dann frazier
Default Bug#521016: llseek regression introduced by syscall wrapping

Package: linux-2.6
Version: 2.6.26-13lenny2
Severity: critical

Note - this bug affects upstream 2.6.29 as well, but I believe the
Debian 2.6.28 packages are ok (the mips-specific changes for
CVE-2009-0029 happened later).

----- Forwarded message from dann frazier <dannf@dannf.org> -----

Date: Mon, 23 Mar 2009 21:01:32 -0600
From: dann frazier <dannf@dannf.org>
To: linux-mips@linux-mips.org
Subject: syscall wrapper changes cause llseek failure

I had a report today of a possible regression caused by the syscall
wrapper changes. On a pristine 64-bit 2.6.29-rc8 kernel, llseek seems
to always return -EINVAL. This was noticed on one of the Debian
infrastructure machines where, after an upgrade, e2fsck began failing
with errors like:

Error reading block 524290 (Invalid argument) while getting next inode
from scan. Ignore error<y>?

I believe this is due to the syswrapper changes because its easy to
reproduce with Debian's 2.6.26 patched w/ the syswrapper changes, but
goes away if we back the syswrapper changes back out.

I compared strace output between a working and failing kernel:

no syscall wrappers:
_llseek(3, 2147491840, [2147491840], SEEK_SET) = 0
_llseek(3, 2147524608, [2147524608], SEEK_SET) = 0

syscall wrappers:
_llseek(3, 2147491840, 0x7fa5d7f0, SEEK_SET) = -1 EINVAL (Invalid argument)
_llseek(3, 2147491840, 0x7fa5d6d0, SEEK_SET) = -1 EINVAL (Invalid argument)

config is available here;

dann frazier

----- End forwarded message -----

dann frazier

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