Re: [PATCH v3 03/12] x86/alternatives: Disable LASS when patching kernel alternatives
From: Edgecombe, Rick P
Date: Mon Jul 31 2023 - 18:41:28 EST
On Fri, 2023-06-09 at 21:36 +0300, Alexander Shishkin wrote:
> +/*
> + * poking_init() initializes the text poking address from the lower
> half of the
> + * address space. Relax LASS enforcement when accessing the poking
> address.
> + */
> static void text_poke_memcpy(void *dst, const void *src, size_t len)
> {
> - memcpy(dst, src, len);
> + stac();
> + __inline_memcpy(dst, src, len);
> + clac();
> }
>
> static void text_poke_memset(void *dst, const void *src, size_t len)
> {
> int c = *(const int *)src;
>
> - memset(dst, c, len);
> + stac();
> + __inline_memset(dst, c, len);
> + clac();
> }
Why not do stac/clac in a single place inside __text_poke()?