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| author | Joerg Roedel <jroedel@suse.de> | 2021-10-21 10:08:32 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-10-21 18:24:44 +0200 |
| commit | 5681981fb788281b09a4ea14d310d30b2bd89132 (patch) | |
| tree | ec2694e202add3b3b820e21c6ef3e63499376c09 | |
| parent | e7d445ab26db833d6640d4c9a08bee176777cc82 (diff) | |
| download | lwn-5681981fb788281b09a4ea14d310d30b2bd89132.tar.gz lwn-5681981fb788281b09a4ea14d310d30b2bd89132.zip | |
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 <thomas.lendacky@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211021080833.30875-2-joro@8bytes.org
| -rw-r--r-- | arch/x86/kernel/traps.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index a58800973aed..f516f2b4797e 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: |