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Date: Fri, 10 Apr 2026 20:10:03 +0900
From: Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kwilczynski@kernel.org>
To: Ilpo =?utf-8?B?SsOkcnZpbmVu?= <ilpo.jarvinen@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>, Bjorn Helgaas <helgaas@kernel.org>,
	Manivannan Sadhasivam <mani@kernel.org>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Magnus Lindholm <linmag7@gmail.com>,
	Matt Turner <mattst88@gmail.com>,
	Richard Henderson <richard.henderson@linaro.org>,
	Christophe Leroy <chleroy@kernel.org>,
	Madhavan Srinivasan <maddy@linux.ibm.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	Dexuan Cui <decui@microsoft.com>,
	Krzysztof =?utf-8?Q?Ha=C5=82asa?= <khalasa@piap.pl>,
	Lukas Wunner <lukas@wunner.de>,
	Oliver O'Halloran <oohall@gmail.com>,
	Saurabh Singh Sengar <ssengar@microsoft.com>,
	Shuan He <heshuan@bytedance.com>,
	Srivatsa Bhat <srivatsabhat@microsoft.com>,
	linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 10/20] alpha/PCI: Add security_locked_down() check to
 pci_mmap_resource()
Message-ID: <20260410111003.GA1750802@rocinante>
References: <20260410055040.39233-1-kwilczynski@kernel.org>
 <20260410055040.39233-11-kwilczynski@kernel.org>
 <93f81aa9-ce74-92bb-5227-d2ccb0a3e06c@linux.intel.com>
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In-Reply-To: <93f81aa9-ce74-92bb-5227-d2ccb0a3e06c@linux.intel.com>

Hello,

> > Currently, Alpha's pci_mmap_resource() does not check
> > security_locked_down(LOCKDOWN_PCI_ACCESS) before allowing
> > userspace to mmap PCI BARs.
> > 
> > The generic version has had this check since commit eb627e17727e
> > ("PCI: Lock down BAR access when the kernel is locked down") to
> > prevent DMA attacks when the kernel is locked down.
> > 
> > Add the same check to Alpha's pci_mmap_resource().
> > 
> > Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
> 
> Maybe add Fixes: eb627e17727e ...

Good call, will do!

Thank you!

	Krzysztof