Re: [PATCH v5 1/7] mm: Restore init_on_* static branch defaults
From: Andrew Morton <akpm@linux-foundation.org>
Date: 2021-03-10 23:56:50
Also in:
linux-hardening, linux-mm, lkml, stable
On Tue, 9 Mar 2021 13:42:55 -0800 Kees Cook [off-list ref] wrote:
Choosing the initial state of static branches changes the assembly layout (if the condition is expected to be likely, inline, or unlikely, out of line via a jump). The _TRUE/_FALSE defines for CONFIG_INIT_ON_*_DEFAULT_ON were accidentally removed. These need to stay so that the CONFIG controls the pessimization of the resulting static branch NOP/JMP locations.
Changelog doesn't really explain why anyone would want to apply this patch. This is especially important for -stable patches. IOW, what is the user visible effect of the bug? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel