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arm64: Fix __range_ok macro

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Without this, the following scenario is incorrectly determined
to be invalid.

addr 0x7f_ffffe000 size 8192 addr_limit 0x80_00000000

This behavior was observed while trying to vmsplice the stack
as part of a CRIU dump of a process on a system started with the
norandmaps kernel parameter.

Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit 31b1e940c5)
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Christopher Covington
2014-03-19 16:29:37 +00:00
committed by Mark Brown
parent 1af7205a96
commit edd5429275
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/include/asm/uaccess.h
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@@ -83,7 +83,7 @@ static inline void set_fs(mm_segment_t fs)
* Returns 1 if the range is valid, 0 otherwise.
*
* This is equivalent to the following test:
* (u65)addr + (u65)size < (u65)current->addr_limit
* (u65)addr + (u65)size <= current->addr_limit
*
* This needs 65-bit arithmetic.
*/
@@ -91,7 +91,7 @@ static inline void set_fs(mm_segment_t fs)
({ \
unsigned long flag, roksum; \
__chk_user_ptr(addr); \
asm("adds %1, %1, %3; ccmp %1, %4, #2, cc; cset %0, cc" \
asm("adds %1, %1, %3; ccmp %1, %4, #2, cc; cset %0, ls" \
: "=&r" (flag), "=&r" (roksum) \
: "1" (addr), "Ir" (size), \
"r" (current_thread_info()->addr_limit) \