Commit 93a6ca7f authored Feb 15, 2016 by Furquan Shaikh Committed by Greg Kroah-Hartman Oct 28, 2016

pstore/ram: Use memcpy_toio instead of memcpy



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@google.com>
Signed-off-by: Enric Balletbo Serra <enric.balletbo@collabora.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 8a3a5110

fs/pstore/ram_core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -263,7 +263,7 @@ static void notrace persistent_ram_update(struct persistent_ram_zone *prz,
		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);
		}