tilegx: enable SYSCALL_WRAPPERS support

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@tilera.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 7c9d2d425d6f2d6de67281af4f0f292748b68035..6cb83191ecc09ae9ee91cf22a4d72c123a09e8e6 100644 (file)
--- 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