tree 81feb3cc66d49cfd89b0b26f067bbb52e164d0d8
parent a6e995ad7409403c5bbd6fe8f666a280e086bb22
author Heiko Carstens <heiko.carstens@de.ibm.com> 1253720995 +0200
committer Linus Torvalds <torvalds@linux-foundation.org> 1253722865 -0700

fs: change sys_truncate length parameter type

For this system call user space passes a signed long length parameter,
while the kernel side takes an unsigned long parameter and converts it
later to signed long again.

This has led to bugs in compat wrappers see e.g.  dd90bbd5 "powerpc: Add
compat_sys_truncate".  The s390 compat wrapper for this functions is
broken as well since it also performs zero extension instead of sign
extension for the length parameter.

In addition if hpa comes up with an automated way of generating
compat wrappers it would generate a wrong one here.

So change the length parameter from unsigned long to long.

Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>