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authorChristopher Covington <cov@codeaurora.org>2014-03-19 16:29:37 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2014-03-20 17:41:27 +0000
commit31b1e940c5d47ee1a01baeccfb1b2b8890822d1a (patch)
treed80caf209aa2c68f96365e0c3bcb7a14719fb4c7 /arch/arm64/include/asm/uaccess.h
parentarm64: Fix duplicated Kconfig entries (diff)
downloadlinux-dev-31b1e940c5d47ee1a01baeccfb1b2b8890822d1a.tar.xz
linux-dev-31b1e940c5d47ee1a01baeccfb1b2b8890822d1a.zip
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 '')
-rw-r--r--arch/arm64/include/asm/uaccess.h4
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) \