kernel.git/arch/sparc/lib/usercopy.c, branch linux-3.7.y

lib: Sparc's strncpy_from_user is generic enough, move under lib/

2012-05-24T20:12:28Z

To use this, an architecture simply needs to: 1) Provide a user_addr_max() implementation via asm/uaccess.h 2) Add "select GENERIC_STRNCPY_FROM_USER" to their arch Kcnfig 3) Remove the existing strncpy_from_user() implementation and symbol exports their architecture had. Signed-off-by: David S. Miller Acked-by: David Howells

kernel: Move REPEAT_BYTE definition into linux/kernel.h

2012-05-24T20:10:05Z

And make sure that everything using it explicitly includes that header file. Signed-off-by: David S. Miller

sparc: Increase portability of strncpy_from_user() implementation.

2012-05-24T20:04:24Z

Hide details of maximum user address calculation in a new asm/uaccess.h interface named user_addr_max(). Provide little-endian implementation in find_zero(), which should work but can probably be improved. Abstrace alignment check behind IS_UNALIGNED() macro. Kill double-semicolon, noticed by David Howells. Signed-off-by: David S. Miller

sparc: Optimize strncpy_from_user() zero byte search.

2012-05-24T02:20:20Z

Compute a mask that will only have 0x80 in the bytes which had a zero in them. The formula is: ~(((x & 0x7f7f7f7f) + 0x7f7f7f7f) | x | 0x7f7f7f7f) In the inner word iteration, we have to compute the "x | 0x7f7f7f7f" part, so we can reuse that in the above calculation. Once we have this mask, we perform divide and conquer to find the highest 0x80 location. Signed-off-by: David S. Miller

sparc: Add full proper error handling to strncpy_from_user().

2012-05-23T06:32:27Z

Linus removed the end-of-address-space hackery from fs/namei.c:do_getname() so we really have to validate these edge conditions and cannot cheat any more (as x86 used to as well). Move to a common C implementation like x86 did. And if both src and dst are sufficiently aligned we'll do word at a time copies and checks as well. Signed-off-by: David S. Miller

sparc: Use __builtin_object_size() to validate the buffer size for copy_from_user()

2009-12-11T07:05:23Z

This mirrors x86 commit 9f0cf4adb6aa0bfccf675c938124e68f7f06349d (x86: Use __builtin_object_size() to validate the buffer size for copy_from_user()) Signed-off-by: David S. Miller