fs/compat: fix lookup_dcookie() parameter handling
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Wed, 29 Jan 2014 22:05:46 +0000 (14:05 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 30 Jan 2014 00:22:40 +0000 (16:22 -0800)
commitd8d14bd09cddbaf0168d61af638455a26bd027ff
tree7f52af4737d5435e87a25e767d04de33223fccc5
parentdfd948e32af2e7b28bcd7a490c0a30d4b8df2a36
fs/compat: fix lookup_dcookie() parameter handling

Commit d5dc77bfeeab ("consolidate compat lookup_dcookie()") coverted all
architectures to the new compat_sys_lookup_dcookie() syscall.

The "len" paramater of the new compat syscall must have the type
compat_size_t in order to enforce zero extension for architectures where
the ABI requires that the caller of a function performed zero and/or
sign extension to 64 bit of all parameters.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <stable@vger.kernel.org> [v3.10+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/dcookies.c
include/linux/compat.h