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Fri, 10 Apr 2026 05:51:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775800280; bh=RJIbkZ2vyHUaEoq5eiCMqBUxiew4KtMmfoufXoK9vfk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=liCvDkXgv7IA7HXmjFq8dJ0WMbYu6MZvNqB4kiD0BSaMgAPd/2c2zB2OX9kHJ0ATy W+PnIPy3kIG686pSrdTPCUcgVjtAkVa8Oh0JtY0Z+wMgZyuJGoUqxYFKX5yxKhvUeT XXpIHUgpXZsp08QWBXesvroou4mvzJgHjvboX9BSjAWUAko9ZP2LtK+gQCIlHo2G0x FTfMh+sPelY4HKAsauSsunCiWVGWmcmtN25ky16oOFQbBeldoblTxD5NQulR2WvUxy N0Jk8jQxi1XZldp8ovRL1OlUzUz6l6biiioMY4LkFVC0S2Dvy2Mu2w4fKRmbF+bwwz Zwoesx3LRDWMw== From: =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= To: Bjorn Helgaas Cc: Bjorn Helgaas , Manivannan Sadhasivam , Lorenzo Pieralisi , Magnus Lindholm , Matt Turner , Richard Henderson , Christophe Leroy , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Dexuan Cui , =?UTF-8?q?Krzysztof=20Ha=C5=82asa?= , Lukas Wunner , "Oliver O'Halloran" , Saurabh Singh Sengar , Shuan He , Srivatsa Bhat , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 10/20] alpha/PCI: Add security_locked_down() check to pci_mmap_resource() Date: Fri, 10 Apr 2026 05:50:30 +0000 Message-ID: <20260410055040.39233-11-kwilczynski@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260410055040.39233-1-kwilczynski@kernel.org> References: <20260410055040.39233-1-kwilczynski@kernel.org> 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-Transfer-Encoding: 8bit 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 --- arch/alpha/kernel/pci-sysfs.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c index 3048758304b5..2324720c3e83 100644 --- a/arch/alpha/kernel/pci-sysfs.c +++ b/arch/alpha/kernel/pci-sysfs.c @@ -11,6 +11,7 @@ */ #include +#include #include #include #include @@ -71,7 +72,11 @@ static int pci_mmap_resource(struct kobject *kobj, struct resource *res = attr->private; enum pci_mmap_state mmap_type; struct pci_bus_region bar; - int i; + int i, ret; + + ret = security_locked_down(LOCKDOWN_PCI_ACCESS); + if (ret) + return ret; for (i = 0; i < PCI_STD_NUM_BARS; i++) if (res == &pdev->resource[i]) -- 2.53.0