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| author | Joerg Roedel <jroedel@suse.de> | 2021-10-21 11:08:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 21:16:39 +0300 |
| commit | 907d34b74c6456d76db3f623824dc1261fe57aef (patch) | |
| tree | 43931c1f5a3eae8488050fe6ffdca96f39a684dc /arch/x86/kernel | |
| parent | 3dd4b42d95a0692c85ebd5da635bae62fa6c9d83 (diff) | |
| download | linux-907d34b74c6456d76db3f623824dc1261fe57aef.tar.xz | |
x86/sev: Fix stack type check in vc_switch_off_ist()
[ Upstream commit 5681981fb788281b09a4ea14d310d30b2bd89132 ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/x86/kernel')
| -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 cc6de3a01293..5b1984d46822 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -743,7 +743,7 @@ 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: |