linux-stable.git/include/asm-generic/uaccess.h, branch linux-3.12.y

asm-generic: make copy_from_user() zero the destination properly

2016-09-29T09:14:35+00:00

commit 2545e5da080b4839dd859e3b09343a884f6ab0e3 upstream.

... in all cases, including the failing access_ok()

Note that some architectures using asm-generic/uaccess.h have
__copy_from_user() not zeroing the tail on failure halfway
through.  This variant works either way.

Signed-off-by: Al Viro 
Signed-off-by: Jiri Slaby

asm-generic: make get_user() clear the destination on errors

2016-09-29T09:14:31+00:00

commit 9ad18b75c2f6e4a78ce204e79f37781f8815c0fa upstream.

both for access_ok() failures and for faults halfway through

Signed-off-by: Al Viro 
Signed-off-by: Jiri Slaby

asm-generic: uaccess s/might_sleep/might_fault/

2013-05-28T07:41:05+00:00

The only reason uaccess routines might sleep
is if they fault. Make this explicit.

Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Peter Zijlstra 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/1369577426-26721-1-git-send-email-mst@redhat.com
Signed-off-by: Ingo Molnar

asm-generic: uaccess: Allow arches to over-ride __{get,put}_user_fn()

2013-02-11T14:30:32+00:00

As of now these default to calling the arch provided __copy_{to,from}_user()
routines which being general purpose (w.r.t buffer alignment and lengths)
would lead to alignment checks in generated code (for arches which don't
support unaligned load/stores).

Given that in this case we already know that data involved is "unit"
sized and aligned, using the vanilla copy backend is a bit wasteful.

This change thus allows arches to over-ride the aforementioned routines.

Signed-off-by: Vineet Gupta 
Acked-by: Arnd Bergmann

asm-generic headers: uaccess.h to conditionally define segment_eq()

2013-02-11T14:30:31+00:00

This is because mm_segment_t is exported by arch code, while seqment_eq
assumes it will have .seg element.

Acked-by: Arnd Bergmann 
Signed-off-by: Vineet Gupta

fix default __strnlen_user macro

2011-10-06T23:47:12+00:00

The existing __strnlen_user macro simply resolved to strnlen. However, the
count returned by strnlen_user should include the NULL byte. This patch
fixes the __strnlen_user macro to include the NULL byte in the count.

Signed-off-by: Mark Salter 
Acked-by: Arnd Bergmann

asm-generic headers: add arch-specific __strnlen_user calling in uaccess.h

2011-03-17T01:19:05+00:00

This patch changes the implementation of strnlen_user in include/asm-generic/uaccess.h.
Originally, it calls strlen() function directly, which may not correctly handle the access of
user space in most mmu-enabled architectures.
New __strnlen_user is added for using as an architecture specific function.

Signed-off-by: Guan Xuetao 
Reviewed-by: Arnd Bergmann

asm-generic: uaccess: fix up local access_ok() usage

2009-06-19T12:58:08+00:00

There's no reason that I can see to use the short __access_ok() form
directly when the access_ok() is clearer in intent and for most people,
expands to the same C code (i.e. always specify the first field -- access
type).  Not all no-mmu systems lack memory protection, so the read/write
could feasibly be checked.

Signed-off-by: Mike Frysinger 
Signed-off-by: Arnd Bergmann

asm-generic: uaccess: add missing access_ok() check to strnlen_user()

2009-06-19T12:58:07+00:00

The strnlen_user() function was missing a access_ok() check on the pointer
given.  We've had cases on Blackfin systems where test programs caused
kernel crashes here because userspace passed up a NULL/-1 pointer and the
kernel gladly attempted to run strlen() on it.

Signed-off-by: Mike Frysinger 
Signed-off-by: Arnd Bergmann

asm-generic: add a generic uaccess.h

2009-06-11T19:02:50+00:00

Based on discussions with Michal Simek and code
from m68knommu and h8300, this version of uaccess.h
should be usable by most architectures, by overriding
some parts of it.

Simple NOMMU architectures can use it out of
the box, but a minimal __access_ok() should be
added there as well.

Cc: Michal Simek 
Signed-off-by: Arnd Bergmann