From: Jan Beulich <JBeulich@novell.com>
Date: Mon, 26 Oct 2009 15:20:29 +0000 (+0000)
Subject: x86-64: Fix register leak in 32-bit syscall audting
X-Git-Tag: v2.6.27.39~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91d5ee32e8562dbb2cb801e85d15f39a81849147;p=pandora-kernel.git

x86-64: Fix register leak in 32-bit syscall audting

commit 81766741fe1eee3884219e8daaf03f466f2ed52f upstream.

Restoring %ebp after the call to audit_syscall_exit() is not
only unnecessary (because the register didn't get clobbered),
but in the sysenter case wasn't even doing the right thing: It
loaded %ebp from a location below the top of stack (RBP <
ARGOFFSET), i.e. arbitrary kernel data got passed back to user
mode in the register.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Roland McGrath <roland@redhat.com>
LKML-Reference: <4AE5CC4D020000780001BD13@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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