user/sven/linux.git/include/asm-generic/uaccess.h, branch stable/3.2.y

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

2016-11-20T01:01:38Z

commit 9ad18b75c2f6e4a78ce204e79f37781f8815c0fa upstream. both for access_ok() failures and for faults halfway through Signed-off-by: Al Viro [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings

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

2016-11-20T01:01:37Z

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 [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings

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

2011-03-17T01:19:05Z

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

2009-06-19T12:58:08Z

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()

2009-06-19T12:58:07Z

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

2009-06-11T19:02:50Z

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

asm-generic: rename page.h and uaccess.h

2009-06-11T19:02:17Z

The current asm-generic/page.h only contains the get_order function, and asm-generic/uaccess.h only implements unaligned accesses. This renames the file to getorder.h and uaccess-unaligned.h to make room for new page.h and uaccess.h file that will be usable by all simple (e.g. nommu) architectures. Signed-off-by: Remis Lima Baima Signed-off-by: Arnd Bergmann

[UACCESS]: Fix typo in generic __get_user_unaligned().

2004-08-27T06:45:44Z

Signed-off-by: David S. Miller

[PATCH] Fix copying of unaligned data across user/kernel boundary

2004-08-27T03:43:14Z

32 bit compatibility code sometimes needs to copy unaligned data across kernel/user boundary and currently there is no architecture independent API to do it. (1) Introduce new APIs __{get,put}_user_unaligned. These APIs are necessary because the optimal way to copy unaligned data across kernel/user boundary is different on different architectures. Some architectures don't even care about alignment. On some __put_user is faster than __copy_to_user for small sizes. (2) Optimize __{get,put}_user_unaligned for ia64, x86-64, s390, ppc64. (3) Fix compat_filldir64() which is broken on big-endian machines Thanks to Arnd Bergmann for his help. Signed-off-by: Gordon Jin Signed-off-by: Arun Sharma Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds