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TITLE:
Linux Kernel 32bit/64bit System Call Security Bypass Weaknesses

SECUNIA ADVISORY ID:
SA34084

VERIFY ADVISORY:
http://secunia.com/advisories/34084/

DESCRIPTION:
Two weaknesses have been reported in the Linux Kernel, which can be
exploited by malicious, local users to bypass certain security
restrictions.

1) An implementation error within the "PR_SET_SECCOMP" feature can be
exploited to invoke certain restricted system calls by e.g. switching
a 32bit process to 64bit mode and using the "syscall" instruction or
using the interrupt 80h in a 64bit process.

2) An implementation error within the "audit_syscall_entry()"
function can be exploited to bypass the auditing by e.g. switching a
32bit process to 64bit mode and using the "syscall" instruction or
using the interrupt 80h in a 64bit process.

SOLUTION:
Fixed in the GIT repository.

PROVIDED AND/OR DISCOVERED BY:
1) Chris Evans
2) Roland McGrath

ORIGINAL ADVISORY:
1) http://scary.beasts.org/security/CESA-2009-004.html
2)
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ccbe495caa5e604b04d5a31d7459a6f6a76a756c

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