On Fri, Dec 13, 2024 at 11:44:22AM +0800, haixiao.yan.cn@xxxxxxxxxxxxxxxxx wrote: > From: Nathan Lynch <nathanl@xxxxxxxxxxxxx> > > [ Upstream commit 0974d03eb479384466d828d65637814bee6b26d7 ] > > Smatch warns: > > arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential > spectre issue 'args.args' [r] (local cap) > > The 'nargs' and 'nret' locals come directly from a user-supplied > buffer and are used as indexes into a small stack-based array and as > inputs to copy_to_user() after they are subject to bounds checks. > > Use array_index_nospec() after the bounds checks to clamp these values > for speculative execution. > > Signed-off-by: Nathan Lynch <nathanl@xxxxxxxxxxxxx> > Reported-by: Breno Leitao <leitao@xxxxxxxxxx> > Reviewed-by: Breno Leitao <leitao@xxxxxxxxxx> > Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > Link: https://msgid.link/20240530-sys_rtas-nargs-nret-v1-1-129acddd4d89@xxxxxxxxxxxxx > Signed-off-by: Haixiao Yan <haixiao.yan.cn@xxxxxxxxxxxxx> > --- > This commit is backporting 0974d03eb479 to the branch linux-5.15.y to > solve the CVE-2024-46774. Now deleted, please see: https://lore.kernel.org/r/2024121322-conjuror-gap-b542@gregkh for what you all need to do, TOGETHER, to get this fixed and so that I can accept patches from your company in the future. thanks, greg k-h
