linux-kernel - [PATCH 3.12 028/107] compat: fix sys_fanotify

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Message-Id: <20140211184748.999010873@linuxfoundation.org>
Date:	Tue, 11 Feb 2014 11:04:54 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Heiko Carstens <heiko.carstens@...ibm.com>,
	Andreas Krebbel <krebbel@...ux.vnet.ibm.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	"David S. Miller" <davem@...emloft.net>,
	Al Viro <viro@...IV.linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...hat.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3.12 028/107] compat: fix sys_fanotify_mark

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Heiko Carstens <heiko.carstens@...ibm.com>

commit 592f6b842f64e416c7598a1b97c649b34241e22d upstream.

Commit 91c2e0bcae72 ("unify compat fanotify_mark(2), switch to
COMPAT_SYSCALL_DEFINE") added a new unified compat fanotify_mark syscall
to be used by all architectures.

Unfortunately the unified version merges the split mask parameter in a
wrong way: the lower and higher word got swapped.

This was discovered with glibc's tst-fanotify test case.

Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
Reported-by: Andreas Krebbel <krebbel@...ux.vnet.ibm.com>
Cc: "James E.J. Bottomley" <jejb@...isc-linux.org>
Acked-by: "David S. Miller" <davem@...emloft.net>
Acked-by: Al Viro <viro@...IV.linux.org.uk>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/notify/fanotify/fanotify_user.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -888,9 +888,9 @@ COMPAT_SYSCALL_DEFINE6(fanotify_mark,
 {
 	return sys_fanotify_mark(fanotify_fd, flags,
 #ifdef __BIG_ENDIAN
-				((__u64)mask1 << 32) | mask0,
-#else
 				((__u64)mask0 << 32) | mask1,
+#else
+				((__u64)mask1 << 32) | mask0,
 #endif
 				 dfd, pathname);
 }

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