This is a note to let you know that I've just added the patch titled
pstore/ram: Use memcpy_toio instead of memcpy
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:
pstore-ram-use-memcpy_toio-instead-of-memcpy.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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 7e75678d23167c2527e655658a8ef36a36c8b4d9 Mon Sep 17 00:00:00 2001
From: Furquan Shaikh <furquan@xxxxxxxxxx>
Date: Mon, 15 Feb 2016 09:19:48 +0100
Subject: pstore/ram: Use memcpy_toio instead of memcpy
From: Furquan Shaikh <furquan@xxxxxxxxxx>
commit 7e75678d23167c2527e655658a8ef36a36c8b4d9 upstream.
persistent_ram_update uses vmap / iomap based on whether the buffer is in
memory region or reserved region. However, both map it as non-cacheable
memory. For armv8 specifically, non-cacheable mapping requests use a
memory type that has to be accessed aligned to the request size. memcpy()
doesn't guarantee that.
Signed-off-by: Furquan Shaikh <furquan@xxxxxxxxxx>
Signed-off-by: Enric Balletbo Serra <enric.balletbo@xxxxxxxxxxxxx>
Reviewed-by: Aaron Durbin <adurbin@xxxxxxxxxxxx>
Reviewed-by: Olof Johansson <olofj@xxxxxxxxxxxx>
Tested-by: Furquan Shaikh <furquan@xxxxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/pstore/ram_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -263,7 +263,7 @@ static void notrace persistent_ram_updat
const void *s, unsigned int start, unsigned int count)
{
struct persistent_ram_buffer *buffer = prz->buffer;
- memcpy(buffer->data + start, s, count);
+ memcpy_toio(buffer->data + start, s, count);
persistent_ram_update_ecc(prz, start, count);
}
Patches currently in stable-queue which might be from furquan@xxxxxxxxxx are
queue-4.4/pstore-ram-use-memcpy_toio-instead-of-memcpy.patch
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