kernel.git/arch/arm/include/asm/uaccess.h, branch linux-3.2.y

ARM: 8051/1: put_user: fix possible data corruption in put_user

2014-07-11T12:33:36Z

commit 537094b64b229bf3ad146042f83e74cf6abe59df upstream. According to arm procedure call standart r2 register is call-cloberred. So after the result of x expression was put into r2 any following function call in p may overwrite r2. To fix this, the result of p expression must be saved to the temporary variable before the assigment x expression to __r2. Signed-off-by: Andrey Ryabinin Reviewed-by: Nicolas Pitre Signed-off-by: Russell King Signed-off-by: Ben Hutchings

ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS

2014-01-03T04:33:35Z

commit 8404663f81d212918ff85f493649a7991209fa04 upstream. The {get,put}_user macros don't perform range checking on the provided __user address when !CPU_HAS_DOMAINS. This patch reworks the out-of-line assembly accessors to check the user address against a specified limit, returning -EFAULT if is is out of range. [will: changed get_user register allocation to match put_user] [rmk: fixed building on older ARM architectures] Reported-by: Catalin Marinas Signed-off-by: Will Deacon Signed-off-by: Russell King [bwh: Backported to 3.2: TUSER() was called T()] Signed-off-by: Ben Hutchings

ARM: 6384/1: Remove the domain switching on ARMv6k/v7 CPUs

2010-11-04T15:44:31Z

This patch removes the domain switching functionality via the set_fs and __switch_to functions on cores that have a TLS register. Currently, the ioremap and vmalloc areas share the same level 1 page tables and therefore have the same domain (DOMAIN_KERNEL). When the kernel domain is modified from Client to Manager (via the __set_fs or in the __switch_to function), the XN (eXecute Never) bit is overridden and newer CPUs can speculatively prefetch the ioremap'ed memory. Linux performs the kernel domain switching to allow user-specific functions (copy_to/from_user, get/put_user etc.) to access kernel memory. In order for these functions to work with the kernel domain set to Client, the patch modifies the LDRT/STRT and related instructions to the LDR/STR ones. The user pages access rights are also modified for kernel read-only access rather than read/write so that the copy-on-write mechanism still works. CPU_USE_DOMAINS gets disabled only if the hardware has a TLS register (CPU_32v6K is defined) since writing the TLS value to the high vectors page isn't possible. The user addresses passed to the kernel are checked by the access_ok() function so that they do not point to the kernel space. Tested-by: Anton Vorontsov Cc: Tony Lindgren Signed-off-by: Catalin Marinas Signed-off-by: Russell King

ARM: fix build error in arch/arm/kernel/process.c

2010-04-21T07:45:21Z

/tmp/ccJ3ssZW.s: Assembler messages: /tmp/ccJ3ssZW.s:1952: Error: can't resolve `.text' {.text section} - `.LFB1077' This is caused because: .section .data .section .text .section .text .previous does not return us to the .text section, but the .data section; this makes use of .previous dangerous if the ordering of previous sections is not known. Fix up the other users of .previous; .pushsection and .popsection are a safer pairing to use than .section and .previous. Signed-off-by: Russell King

Thumb-2: Implement the unified arch/arm/lib functions

2009-07-24T11:32:57Z

This patch adds the ARM/Thumb-2 unified support for the arch/arm/lib/* files. Signed-off-by: Catalin Marinas

[ARM] allow for alternative __copy_to_user/__clear_user implementations

2009-05-30T02:34:45Z

This allows for optional alternative implementations of __copy_to_user and __clear_user, with a possible runtime fallback to the standard version when the alternative provides no gain over that standard version. This is done by making the standard __copy_to_user into a weak alias for the symbol __copy_to_user_std. Same thing for __clear_user. Those two functions are particularly good candidates to have alternative implementations for, since they rely on the STRT instruction which has lower performances than STM instructions on some CPU cores such as the ARM1176 and Marvell Feroceon. Signed-off-by: Nicolas Pitre

[ARM] Remove linux/sched.h from asm/cacheflush.h and asm/uaccess.h

2008-11-29T18:49:55Z

... and fix those drivers that were incorrectly relying upon that include. Signed-off-by: Russell King

[ARM] remove memzero()

2008-11-27T12:37:59Z

As suggested by Andrew Morton, remove memzero() - it's not supported on other architectures so use of it is a potential build breaking bug. Since the compiler optimizes memset(x,0,n) to __memzero() perfectly well, we don't miss out on the underlying benefits of memzero(). Signed-off-by: Russell King

[ARM] 5230/1: Replace post-indexed LDRT/STRT in uaccess.h

2008-09-01T11:06:35Z

The post-index immediate value is optional if it is 0 and this patch removes it. The reason is to allow such instructions to compile to Thumb-2 where only pre-indexed LDRT/STRT instructions are allowed. Signed-off-by: Catalin Marinas Signed-off-by: Russell King

[ARM] move include/asm-arm to arch/arm/include/asm

2008-08-02T20:32:35Z

Move platform independent header files to arch/arm/include/asm, leaving those in asm/arch* and asm/plat* alone. Signed-off-by: Russell King