From: Aurelien Jarno <aurel32@debian.org>
To: Bibo Mao <maobibo@loongson.cn>
Cc: Huacai Chen <chenhuacai@kernel.org>,
Huacai Chen <chenhuacai@loongson.cn>,
Paolo Bonzini <pbonzini@redhat.com>,
Tianrui Zhao <zhaotianrui@loongson.cn>,
kvm@vger.kernel.org, loongarch@lists.linux.dev,
linux-kernel@vger.kernel.org, Xuerui Wang <kernel@xen0n.name>,
Jiaxun Yang <jiaxun.yang@flygoat.com>,
stable@vger.kernel.org
Subject: Re: [PATCH 1/2] LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust
Date: Mon, 23 Mar 2026 19:36:21 +0100 [thread overview]
Message-ID: <acGIJXccO5JVlrGh@aurel32.net> (raw)
In-Reply-To: <696c5177-4a89-f0d0-c305-c1581e72aa3d@loongson.cn>
Hi,
On 2026-03-23 15:56, Bibo Mao wrote:
>
>
> On 2026/3/23 下午3:08, Huacai Chen wrote:
> > On Mon, Mar 23, 2026 at 11:16 AM Bibo Mao <maobibo@loongson.cn> wrote:
> > >
> > >
> > >
> > > On 2026/3/22 下午9:53, Huacai Chen wrote:
> > > > kvm_get_vcpu_by_cpuid() takes a cpuid parameter whose type is int, so
> > > > cpuid can be negative. Let kvm_get_vcpu_by_cpuid() return NULL for this
> > > > case so as to make it more robust.
> > > >
> > > > This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[].
> > > >
> > > > Cc: <stable@vger.kernel.org>
> > > > Fixes: 73516e9da512adc ("LoongArch: KVM: Add vcpu mapping from physical cpuid")
> > > > Reported-by: Aurelien Jarno <aurel32@debian.org>
> > > > Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1131431
> > > > Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
> > > > ---
> > > > arch/loongarch/kvm/vcpu.c | 3 +++
> > > > 1 file changed, 3 insertions(+)
> > > >
> > > > diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
> > > > index 8ffd50a470e6..831f381a8fd1 100644
> > > > --- a/arch/loongarch/kvm/vcpu.c
> > > > +++ b/arch/loongarch/kvm/vcpu.c
> > > > @@ -588,6 +588,9 @@ struct kvm_vcpu *kvm_get_vcpu_by_cpuid(struct kvm *kvm, int cpuid)
> > > > {
> > > > struct kvm_phyid_map *map;
> > > >
> > > > + if (cpuid < 0)
> > > > + return NULL;
> > > > +
> > > > if (cpuid >= KVM_MAX_PHYID)
> > > > return NULL;
> > > >
> > > >
> > >
> > > if (cpuid < 0 || cpuid >= KVM_MAX_PHYID)?
> > > however both are OK for me.
> > I use a similar style as kvm_get_vcpu_by_id(). :)
> >
> > But there is another warning which can't be solved by this series (and
> > I doubt whether it can be solved unless revert 01a8e68396a6d51f5b).
> > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1131431
>
> what is the kernel config file with bug
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1131431
>
I have just sent the kernel config to the bug report.
Regards
Aurelien
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
aurelien@aurel32.net http://aurel32.net
prev parent reply other threads:[~2026-03-23 18:36 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-22 13:53 [PATCH 1/2] LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust Huacai Chen
2026-03-22 13:53 ` [PATCH 2/2] LoongArch: KVM: Handle the case that EIOINTC's coremap is empty Huacai Chen
2026-03-23 3:14 ` Bibo Mao
2026-03-23 3:13 ` [PATCH 1/2] LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust Bibo Mao
2026-03-23 7:08 ` Huacai Chen
2026-03-23 7:56 ` Bibo Mao
2026-03-23 8:08 ` Bibo Mao
2026-03-23 8:14 ` Huacai Chen
2026-03-23 9:40 ` Bibo Mao
2026-03-23 18:36 ` Aurelien Jarno [this message]
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