Patch "arm64: armv8_deprecated: ensure extension of addr" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

arm64: armv8_deprecated: ensure extension of addr

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
arm64-armv8_deprecated-ensure-extension-of-addr.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Mark Rutland <[email protected]>
Date: Wed, 3 May 2017 16:09:36 +0100
Subject: arm64: armv8_deprecated: ensure extension of addr

From: Mark Rutland <[email protected]>

commit 55de49f9aa17b0b2b144dd2af587177b9aadf429 upstream.

Our compat swp emulation holds the compat user address in an unsigned int, which it passes to __user_swpX_asm(). When a 32-bit value is passed in a register, the upper 32 bits of the register are unknown, and we must extend the value to 64 bits before we can use it as a base address.

This patch casts the address to unsigned long to ensure it has been suitably extended, avoiding the potential issue, and silencing a related warning from clang.

---
 arch/arm64/kernel/armv8_deprecated.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -305,7 +305,8 @@ static void register_insn_emulation_sysc
 	ALTERNATIVE("nop", SET_PSTATE_PAN(1), ARM64_HAS_PAN,	\
 		CONFIG_ARM64_PAN)				\
 	: "=&r" (res), "+r" (data), "=&r" (temp)		\
-	: "r" (addr), "i" (-EAGAIN), "i" (-EFAULT)		\
+	: "r" ((unsigned long)addr), "i" (-EAGAIN),		\
+	  "i" (-EFAULT)						\
 	: "memory")
 
 #define __user_swp_asm(data, addr, res, temp) \

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/arm64-armv8_deprecated-ensure-extension-of-addr.patch queue-4.4/arm64-hw_breakpoint-fix-watchpoint-matching-for-tagged-pointers.patch queue-4.4/arm64-ensure-extension-of-smp_store_release-value.patch queue-4.4/perf-core-drop-kernel-samples-even-though-u-is-specified.patch