x86/sev: Allow #VC exceptions on the VC2 stack

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When code running on the VC2 stack causes a nested VC exception, the
handler will not handle it as expected but goes again into the error
path.

The result is that the panic() call happening when the VC exception
was raised in an invalid context is called recursively. Fix this by
checking the interrupted stack too and only call panic if it is not
the VC2 stack.

 [ bp: Fixup comment. ]

Fixes: 0786138c78 ("x86/sev-es: Add a Runtime #VC Exception Handler")
Reported-by: Xinyang Ge <xing@microsoft.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211021080833.30875-3-joro@8bytes.org

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Joerg Roedel 2021-10-21 10:08:33 +02:00 • committed by Borislav Petkov

parent 5681981fb7

commit ce47d0c00f

1 changed files with 17 additions and 4 deletions

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arch/x86/kernel/sev.c

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