This is a note to let you know that I've just added the patch titled
arm64: Ignore the 'write' ESR flag on cache maintenance faults
to the 3.8-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-ignore-the-write-esr-flag-on-cache-maintenance-faults.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0e7f7bcc3fc87489cda5aa6aff8ce40eed912279 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@xxxxxxx>
Date: Tue, 7 May 2013 16:57:06 +0100
Subject: arm64: Ignore the 'write' ESR flag on cache maintenance faults
From: Catalin Marinas <catalin.marinas@xxxxxxx>
commit 0e7f7bcc3fc87489cda5aa6aff8ce40eed912279 upstream.
ESR.WnR bit is always set on data cache maintenance faults even though
the page is not required to have write permission. If a translation
fault (page not yet mapped) happens for read-only user address range,
Linux incorrectly assumes a permission fault. This patch adds the check
of the ESR.CM bit during the page fault handling to ignore the 'write'
flag.
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Reported-by: Tim Northover <Tim.Northover@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/fault.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -148,6 +148,7 @@ void do_bad_area(unsigned long addr, uns
#define VM_FAULT_BADACCESS 0x020000
#define ESR_WRITE (1 << 6)
+#define ESR_CM (1 << 8)
#define ESR_LNX_EXEC (1 << 24)
/*
@@ -206,7 +207,7 @@ static int __kprobes do_page_fault(unsig
struct task_struct *tsk;
struct mm_struct *mm;
int fault, sig, code;
- int write = esr & ESR_WRITE;
+ bool write = (esr & ESR_WRITE) && !(esr & ESR_CM);
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
(write ? FAULT_FLAG_WRITE : 0);
Patches currently in stable-queue which might be from catalin.marinas@xxxxxxx are
queue-3.8/arm64-ignore-the-write-esr-flag-on-cache-maintenance-faults.patch
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