4.8-stable review patch. If anyone has any objections, please let me know.
------------------ From: Furquan Shaikh <[email protected]> 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 <[email protected]> Signed-off-by: Enric Balletbo Serra <[email protected]> Reviewed-by: Aaron Durbin <[email protected]> Reviewed-by: Olof Johansson <[email protected]> Tested-by: Furquan Shaikh <[email protected]> Signed-off-by: Kees Cook <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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); }
