From: Joerg Roedel Date: Thu, 21 Oct 2021 08:08:32 +0000 (+0200) Subject: x86/sev: Fix stack type check in vc_switch_off_ist() X-Git-Tag: v6.1-rc5~2794^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5681981fb788281b09a4ea14d310d30b2bd89132;p=platform%2Fkernel%2Flinux-starfive.git x86/sev: Fix stack type check in vc_switch_off_ist() The value of STACK_TYPE_EXCEPTION_LAST points to the last _valid_ exception stack. Reflect that in the check done in the vc_switch_off_ist() function. Fixes: a13644f3a53de ("x86/entry/64: Add entry code for #VC handler") Reported-by: Tom Lendacky Signed-off-by: Joerg Roedel Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20211021080833.30875-2-joro@8bytes.org --- diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index a588009..f516f2b 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -709,7 +709,7 @@ asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *r stack = (unsigned long *)sp; if (!get_stack_info_noinstr(stack, current, &info) || info.type == STACK_TYPE_ENTRY || - info.type >= STACK_TYPE_EXCEPTION_LAST) + info.type > STACK_TYPE_EXCEPTION_LAST) sp = __this_cpu_ist_top_va(VC2); sync: