MIPS: syscall: Fix AUDIT value for O32 processes on MIPS64

On MIPS64, O32 processes set both TIF_32BIT_ADDR and
TIF_32BIT_REGS so the previous condition treated O32 applications
as N32 when evaluating seccomp filters. Fix the condition to check
both TIF_32BIT_{REGS, ADDR} for the N32 AUDIT flag.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: http://patchwork.linux-mips.org/patch/7480/
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: James Hogan <james.hogan@imgtec.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index 17960fe7a8ce..cdf68b33bd65 100644
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -131,10 +131,12 @@ static inline int syscall_get_arch(void)
 {
         int arch = EM_MIPS;
 #ifdef CONFIG_64BIT
-        if (!test_thread_flag(TIF_32BIT_REGS))
+        if (!test_thread_flag(TIF_32BIT_REGS)) {
                 arch |= __AUDIT_ARCH_64BIT;
-        if (test_thread_flag(TIF_32BIT_ADDR))
-                arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32;
+                /* N32 sets only TIF_32BIT_ADDR */
+                if (test_thread_flag(TIF_32BIT_ADDR))
+                        arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32;
+        }
 #endif
 #if defined(__LITTLE_ENDIAN)
         arch |=  __AUDIT_ARCH_LE;