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Fri, 10 Apr 2026 11:10:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775819405; bh=J9CQoX7GTnEen2B2gzOk+uOsLwI3v0SjpCO+RqDM+0I=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=HfvGo9opSrGDxa/afsb88WuMvZhMT79PSWGaCkUCXr+PWuyTIlqzJku/vQIfjwWzL j2vA53DlizDMUF4zGV35/RZldLiqoGohXZq6jnSNOk01PxuBBZUCXkjRNlagG6ky4a MXb0vT3zawPDmi/1awFBO/99cerh8h1xZTxJfColV8aXphUT0XSSO0DLJkexxwh2ga ppeWV2HjA3itU5agbnn2tKpIsJPnDq3FnXy/j0/yEbBbFZes7bKtcmd5SIU0SXLjYM zOiNgiowSHB/nNlZglFxRlfwkT6zSGpE8Db96Qj+Mhs5V1Kpl2dpMBp08WZXhKF6/3 Bvk2bfIBUQynQ== Date: Fri, 10 Apr 2026 20:10:03 +0900 From: Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= To: Ilpo =?utf-8?B?SsOkcnZpbmVu?= Cc: Bjorn Helgaas , Bjorn Helgaas , Manivannan Sadhasivam , Lorenzo Pieralisi , Magnus Lindholm , Matt Turner , Richard Henderson , Christophe Leroy , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Dexuan Cui , Krzysztof =?utf-8?Q?Ha=C5=82asa?= , Lukas Wunner , Oliver O'Halloran , Saurabh Singh Sengar , Shuan He , Srivatsa Bhat , 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> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit 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 > > Maybe add Fixes: eb627e17727e ... Good call, will do! Thank you! Krzysztof