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authorYong Zhang <yong.zhang@windriver.com>2011-08-16 09:54:54 +0800
committerRalf Baechle <ralf@linux-mips.org>2011-09-21 17:53:44 +0200
commit1eec6cd08b4feb72a73aff468ab72bdd21e1dc61 (patch)
tree70278d81550236b2dc57ddb52b3fc3380fe0c5d9 /arch/mips/kernel/linux32.c
parentb8ecf341f1b7ca7bf3cb80c48cbbae33b79947d0 (diff)
downloadop-kernel-dev-1eec6cd08b4feb72a73aff468ab72bdd21e1dc61.zip
op-kernel-dev-1eec6cd08b4feb72a73aff468ab72bdd21e1dc61.tar.gz
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/linux32.c')
-rw-r--r--arch/mips/kernel/linux32.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 876a75c..922a554 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -349,3 +349,10 @@ SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags,
return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4),
dfd, pathname);
}
+
+SYSCALL_DEFINE6(32_futex, u32 __user *, uaddr, int, op, u32, val,
+ struct compat_timespec __user *, utime, u32 __user *, uaddr2,
+ u32, val3)
+{
+ return compat_sys_futex(uaddr, op, val, utime, uaddr2, val3);
+}
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