Patch "arm64: armv8_deprecated: ensure extension of addr" has been added to the 4.11-stable tree
Subsystems (2)
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 4.11-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-4.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
55de49f9aa17b0b2b144dd2af587177b9aadf429Mon Sep 17 00:00:00 2001
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(-)
arch/arm64/kernel/armv8_deprecated.c +2 -1
@@ -306,7 +306,8 @@ do { \ _ASM_EXTABLE(0b, 4b) \_ASM_EXTABLE (1b ,4b ) \ : "=&r" (res), "+r" (data), "=&r" (temp), "=&r" (temp2) \ -: " r" (addr), " i" (-EAGAIN), " i" (-EFAULT), \ +: " r" ((unsigned long)addr), " i" (-EAGAIN), \ +" i" (-EFAULT), \ " i" (__SWP_LL_SC_LOOPS) \ : " memory"); \ uaccess_disable(); \
Patches currently in stable-queue which might be from [email protected] are
queue-4.11/arm64-armv8_deprecated-ensure-extension-of-addr.patch queue-4.11/arm64-uaccess-ensure-extension-of-access_ok-addr.patch queue-4.11/arm64-hw_breakpoint-fix-watchpoint-matching-for-tagged-pointers.patch queue-4.11/arm64-xchg-hazard-against-entire-exchange-variable.patch queue-4.11/arm64-ensure-extension-of-smp_store_release-value.patch