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Joerg Roedel |
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From: Joerg Roedel <jroedel@suse.de>
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Joerg Roedel |
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Date: Thu, 21 Oct 2021 10:08:32 +0200
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Joerg Roedel |
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Subject: x86/sev: Fix stack type check in vc_switch_off_ist()
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Joerg Roedel |
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Git-commit: 5681981fb788281b09a4ea14d310d30b2bd89132
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Joerg Roedel |
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Patch-mainline: v5.16-rc1
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Joerg Roedel |
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References: git-fixes
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Joerg Roedel |
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Joerg Roedel |
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The value of STACK_TYPE_EXCEPTION_LAST points to the last _valid_
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Joerg Roedel |
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exception stack. Reflect that in the check done in the
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vc_switch_off_ist() function.
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Joerg Roedel |
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Joerg Roedel |
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Fixes: a13644f3a53de ("x86/entry/64: Add entry code for #VC handler")
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Joerg Roedel |
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Reported-by: Tom Lendacky <thomas.lendacky@amd.com>
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Joerg Roedel |
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Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Signed-off-by: Borislav Petkov <bp@suse.de>
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Link: https://lkml.kernel.org/r/20211021080833.30875-2-joro@8bytes.org
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Joerg Roedel |
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---
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arch/x86/kernel/traps.c | 2 +-
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Joerg Roedel |
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1 file changed, 1 insertion(+), 1 deletion(-)
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Joerg Roedel |
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Joerg Roedel |
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--- a/arch/x86/kernel/traps.c
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+++ b/arch/x86/kernel/traps.c
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@@ -674,7 +674,7 @@ asmlinkage __visible struct pt_regs *vc_
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stack = (unsigned long *)sp;
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Joerg Roedel |
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Joerg Roedel |
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if (!get_stack_info_noinstr(stack, current, &info) || info.type == STACK_TYPE_ENTRY ||
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Joerg Roedel |
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- info.type >= STACK_TYPE_EXCEPTION_LAST)
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Joerg Roedel |
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+ info.type > STACK_TYPE_EXCEPTION_LAST)
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Joerg Roedel |
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sp = __this_cpu_ist_top_va(VC2);
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Joerg Roedel |
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Joerg Roedel |
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sync:
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