From: Chao Gao <chao.gao@intel.com>
To: Mathias Krause <minipli@grsecurity.net>
Cc: <kvm@vger.kernel.org>, <pbonzini@redhat.com>, <seanjc@google.com>
Subject: Re: [PATCH 2/2] x86/eventinj: Push SP to IRET frame
Date: Wed, 15 Oct 2025 09:49:50 +0800 [thread overview]
Message-ID: <aO79voQQcg2+m693@intel.com> (raw)
In-Reply-To: <b54b2600-fe9d-44df-8a2a-4e8712d8ab09@grsecurity.net>
>> ---
>> x86/eventinj.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/x86/eventinj.c b/x86/eventinj.c
>> index ec8a5ef1..63ebbaab 100644
>> --- a/x86/eventinj.c
>> +++ b/x86/eventinj.c
>> @@ -153,6 +153,7 @@ asm("do_iret:"
>> "mov 8(%esp), %edx \n\t" // virt_stack
>> #endif
>> "xchg %"R "dx, %"R "sp \n\t" // point to new stack
>> + "push"W" %"R "sp \n\t"
>
>We should also push SS, for consistency reasons. Not that it would
>matter much for x64-64, but a NULL selector for SS still feels wrong.
>
>> "pushf"W" \n\t"
>> "mov %cs, %ecx \n\t"
>> "push"W" %"R "cx \n\t"
>
>The leading comment also needs an update and the 'extern bool
>no_test_device' can be dropped as well, as fwcfg.h gets included by
>eventinj.c.
>
>So, maybe something like this on top?:
Looks good to me. Thanks for your suggestion.
prev parent reply other threads:[~2025-10-15 1:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-15 14:49 [kvm-unit-tests PATCH 0/2] Fix triple fault in eventinj test Chao Gao
2025-09-15 14:49 ` [PATCH 1/2] x86/eventinj: Use global asm label for nested NMI IP address verification Chao Gao
2025-09-16 10:10 ` Mathias Krause
2025-10-15 1:47 ` Chao Gao
2025-10-15 4:29 ` Mathias Krause
2025-09-15 14:49 ` [PATCH 2/2] x86/eventinj: Push SP to IRET frame Chao Gao
2025-09-16 10:21 ` Mathias Krause
2025-10-15 1:49 ` Chao Gao [this message]
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