linux-stable.git/include/asm-generic/uaccess.h, branch linux-4.1.y

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

2016-10-03T01:12:56+00:00

[ Upstream commit 9ad18b75c2f6e4a78ce204e79f37781f8815c0fa ]

both for access_ok() failures and for faults halfway through

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro 
Signed-off-by: Sasha Levin

asm-generic: {get,put}_user ptr argument evaluate only 1 time

2016-10-03T01:12:48+00:00

[ Upstream commit a02613a4ba679eacec8251976d02809d533fa717 ]

Current implemantation ptr argument evaluate 2 times.
It'll be an unexpected result.

Changes v5:
Remove unnecessary const.
Changes v4:
Temporary pointer type change to const void*
Changes v3:
Some build error fix.
Changes v2:
Argument x protect.

Signed-off-by: Yoshinori Sato 
Signed-off-by: Sasha Levin

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

2016-10-03T00:32:37+00:00

[ Upstream commit 2545e5da080b4839dd859e3b09343a884f6ab0e3 ]

... 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.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro 
Signed-off-by: Sasha Levin

asm-generic: uaccess: Spelling s/a ny/any/

2014-01-02T09:45:23+00:00

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Jiri Kosina

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