compat: factor out compat_rw_copy_check_uvector from compat_do_readv_writev
authorJeff Moyer <jmoyer@redhat.com>
Wed, 26 May 2010 21:44:25 +0000 (14:44 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 27 May 2010 16:12:53 +0000 (09:12 -0700)
commitb83733639a494d5f42fa00a2506563fbd2d3015d
tree5aea71a7b0da140d839cc6109091350e1fbc8868
parent5b530fc18324602e1ecb70cd280c2194b2656a5e
compat: factor out compat_rw_copy_check_uvector from compat_do_readv_writev

It was reported in http://lkml.org/lkml/2010/3/8/309 that 32 bit readv and
writev AIO operations were not functioning properly.  It turns out that
the code to convert the 32bit io vectors to 64 bits was never written.
The results of that can be pretty bad, but in my testing, it mostly ended
up in generating EFAULT as we walked off the list of I/O vectors provided.

This patch set fixes the problem in my environment.  are greatly
appreciated.

This patch:

Factor out code that will be used by both compat_do_readv_writev and the
compat aio submission code paths.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Reported-by: Michael Tokarev <mjt@tls.msk.ru>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: <stable@kernel.org> [2.6.35.1]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/compat.c
include/linux/compat.h