linux-kernel - [ 015/117] tilegx: enable SYSCALL

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Message-Id: <20120528031204.950186515@decadent.org.uk>
Date:	Mon, 28 May 2012 04:12:17 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Chris Metcalf <cmetcalf@...era.com>
Subject: [ 015/117] tilegx: enable SYSCALL_WRAPPERS support

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Metcalf <cmetcalf@...era.com>

commit e6d9668e119af44ae5bcd5f1197174531458afe3 upstream.

Some discussion with the glibc mailing lists revealed that this was
necessary for 64-bit platforms with MIPS-like sign-extension rules
for 32-bit values.  The original symptom was that passing (uid_t)-1 to
setreuid() was failing in programs linked -pthread because of the "setxid"
mechanism for passing setxid-type function arguments to the syscall code.
SYSCALL_WRAPPERS handles ensuring that all syscall arguments end up with
proper sign-extension and is thus the appropriate fix for this problem.

On other platforms (s390, powerpc, sparc64, and mips) this was fixed
in 2.6.28.6.  The general issue is tracked as CVE-2009-0029.

Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/tile/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 96033e2..74239dd 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -11,6 +11,7 @@ config TILE
 	select GENERIC_IRQ_PROBE
 	select GENERIC_PENDING_IRQ if SMP
 	select GENERIC_IRQ_SHOW
+	select HAVE_SYSCALL_WRAPPERS if TILEGX
 	select SYS_HYPERVISOR
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG

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