This is a note to let you know that I've just added the patch titled
pstore/ram: Use memcpy_fromio() to save old buffer
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_fromio-to-save-old-buffer.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 d771fdf94180de2bd811ac90cba75f0f346abf8d Mon Sep 17 00:00:00 2001
From: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
Date: Mon, 15 Feb 2016 09:19:49 +0100
Subject: pstore/ram: Use memcpy_fromio() to save old buffer
From: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
commit d771fdf94180de2bd811ac90cba75f0f346abf8d upstream.
The ramoops buffer may be mapped as either I/O memory or uncached
memory. On ARM64, this results in a device-type (strongly-ordered)
mapping. Since unnaligned accesses to device-type memory will
generate an alignment fault (regardless of whether or not strict
alignment checking is enabled), it is not safe to use memcpy().
memcpy_fromio() is guaranteed to only use aligned accesses, so use
that instead.
Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
Signed-off-by: Enric Balletbo Serra <enric.balletbo@xxxxxxxxxxxxx>
Reviewed-by: Puneet Kumar <puneetster@xxxxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/pstore/ram_core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -286,8 +286,8 @@ void persistent_ram_save_old(struct pers
}
prz->old_log_size = size;
- memcpy(prz->old_log, &buffer->data[start], size - start);
- memcpy(prz->old_log + size - start, &buffer->data[0], start);
+ memcpy_fromio(prz->old_log, &buffer->data[start], size - start);
+ memcpy_fromio(prz->old_log + size - start, &buffer->data[0], start);
}
int notrace persistent_ram_write(struct persistent_ram_zone *prz,
Patches currently in stable-queue which might be from abrestic@xxxxxxxxxxxx are
queue-4.4/pstore-ram-use-memcpy_fromio-to-save-old-buffer.patch
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