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authorDmitry V. Levin <ldv@altlinux.org>2017-08-05 22:00:50 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2017-08-06 20:48:27 +0200
commitfbb77611e95d3d5b2af86a59754a3130877cb667 (patch)
tree026bc121b112736776c5de03463ce52fa4424280 /kernel/signal.c
parentMerge tag 'media/v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mc... (diff)
downloadlinux-fbb77611e95d3d5b2af86a59754a3130877cb667.tar.xz
linux-fbb77611e95d3d5b2af86a59754a3130877cb667.zip
Fix compat_sys_sigpending breakage
The latest change of compat_sys_sigpending in commit 8f13621abced ("sigpending(): move compat to native") has broken it in two ways. First, it tries to write 4 bytes more than userspace expects: sizeof(old_sigset_t) == sizeof(long) == 8 instead of sizeof(compat_old_sigset_t) == sizeof(u32) == 4. Second, on big endian architectures these bytes are being written in the wrong order. This bug was found by strace test suite. Reported-by: Anatoly Pugachev <matorola@gmail.com> Inspired-by: Eugene Syromyatnikov <evgsyr@gmail.com> Fixes: 8f13621abced ("sigpending(): move compat to native") Signed-off-by: Dmitry V. Levin <ldv@altlinux.org> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--kernel/signal.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index caed9133ae52..7e33f8c583e6 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3303,12 +3303,15 @@ SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, set)
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set32)
{
+#ifdef __BIG_ENDIAN
sigset_t set;
- int err = do_sigpending(&set, sizeof(old_sigset_t));
- if (err == 0)
- if (copy_to_user(set32, &set, sizeof(old_sigset_t)))
- err = -EFAULT;
+ int err = do_sigpending(&set, sizeof(set.sig[0]));
+ if (!err)
+ err = put_user(set.sig[0], set32);
return err;
+#else
+ return sys_rt_sigpending((sigset_t __user *)set32, sizeof(*set32));
+#endif
}
#endif