diff options
| author | Christopher Covington <cov@codeaurora.org> | 2014-03-19 20:29:37 +0400 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-03-20 21:41:27 +0400 |
| commit | 31b1e940c5d47ee1a01baeccfb1b2b8890822d1a (patch) | |
| tree | d80caf209aa2c68f96365e0c3bcb7a14719fb4c7 /arch/arm64/include/asm/uaccess.h | |
| parent | 74397174989e5f704bcefde7af02e12cc32cb164 (diff) | |
| download | linux-31b1e940c5d47ee1a01baeccfb1b2b8890822d1a.tar.xz | |
arm64: Fix __range_ok macro
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>
Diffstat (limited to 'arch/arm64/include/asm/uaccess.h')
| -rw-r--r-- | arch/arm64/include/asm/uaccess.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 6c0f684aca81..3bf8f4e99a51 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -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) \ |