compat: factor out compat_rw_copy_check_uvector from compat_do_readv_writev

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commit b83733639a upstream.

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

...

This commit is contained in:

Jeff Moyer 2010-05-26 14:44:25 -07:00 • committed by Greg Kroah-Hartman

parent d3eac299ed

commit fed3ff43e1

2 changed files with 81 additions and 53 deletions

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130

fs/compat.c

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4

include/linux/compat.h

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