diff options
| author | Yong Zhang <yong.zhang@windriver.com> | 2011-08-16 09:54:54 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2011-09-21 17:53:44 +0200 |
| commit | 1eec6cd08b4feb72a73aff468ab72bdd21e1dc61 (patch) | |
| tree | 70278d81550236b2dc57ddb52b3fc3380fe0c5d9 /arch/mips/kernel/scall64-n32.S | |
| parent | b8ecf341f1b7ca7bf3cb80c48cbbae33b79947d0 (diff) | |
MIPS: Compat: Use 32-bit wrapper for compat_sys_futex.
We can't trust userspace to pass signed-extend arguments. Not correctly
sign-extended arguments to futex-wait result in architecturally undefined
operation of 32-bit arithmetic instructions.
For example, if 'val' is too big and bit-31 is 1, the caller may enter
endless loop at:
futex_wait_setup()
{
...
if (uval != val) {
queue_unlock(q, *hb);
ret = -EWOULDBLOCK;
...
}
Signed-off-by: Yong Zhang <yong.zhang@windriver.com>
To: linux-mips@linux-mips.org
To: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/2714/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/scall64-n32.S')
| -rw-r--r-- | arch/mips/kernel/scall64-n32.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S index f9296e894e46..6de1f598346e 100644 --- a/arch/mips/kernel/scall64-n32.S +++ b/arch/mips/kernel/scall64-n32.S @@ -315,7 +315,7 @@ EXPORT(sysn32_call_table) PTR sys_fremovexattr PTR sys_tkill PTR sys_ni_syscall - PTR compat_sys_futex + PTR sys_32_futex PTR compat_sys_sched_setaffinity /* 6195 */ PTR compat_sys_sched_getaffinity PTR sys_cacheflush |