{"id":2222334,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2222334/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260411080148.471335-12-kwilczynski@kernel.org/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.2/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260411080148.471335-12-kwilczynski@kernel.org>","list_archive_url":null,"date":"2026-04-11T08:01:35","name":"[v4,11/24] alpha/PCI: Add security_locked_down() check to pci_mmap_resource()","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"85e255e201157199e03ea2f72ba06095bcdd518e","submitter":{"id":86709,"url":"http://patchwork.ozlabs.org/api/1.2/people/86709/?format=json","name":"Krzysztof Wilczyński","email":"kwilczynski@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260411080148.471335-12-kwilczynski@kernel.org/mbox/","series":[{"id":499539,"url":"http://patchwork.ozlabs.org/api/1.2/series/499539/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/list/?series=499539","date":"2026-04-11T08:01:24","name":"PCI: Convert all dynamic sysfs attributes to static","version":4,"mbox":"http://patchwork.ozlabs.org/series/499539/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2222334/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2222334/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=K7dA5Uu+;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.232.135.74; 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charset=UTF-8","Content-Transfer-Encoding":"8bit"},"content":"Currently, Alpha's pci_mmap_resource() does not check\nsecurity_locked_down(LOCKDOWN_PCI_ACCESS) before allowing\nuserspace to mmap PCI BARs.\n\nThe generic version has had this check since commit eb627e17727e\n(\"PCI: Lock down BAR access when the kernel is locked down\") to\nprevent DMA attacks when the kernel is locked down.\n\nAdd the same check to Alpha's pci_mmap_resource().\n\nFixes: eb627e17727e (\"PCI: Lock down BAR access when the kernel is locked down\")\nReviewed-by: Ilpo Järvinen \nSigned-off-by: Krzysztof Wilczyński \n---\n arch/alpha/kernel/pci-sysfs.c | 7 ++++++-\n 1 file changed, 6 insertions(+), 1 deletion(-)","diff":"diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c\nindex 3048758304b5..2324720c3e83 100644\n--- a/arch/alpha/kernel/pci-sysfs.c\n+++ b/arch/alpha/kernel/pci-sysfs.c\n@@ -11,6 +11,7 @@\n */\n \n #include \n+#include \n #include \n #include \n #include \n@@ -71,7 +72,11 @@ static int pci_mmap_resource(struct kobject *kobj,\n \tstruct resource *res = attr->private;\n \tenum pci_mmap_state mmap_type;\n \tstruct pci_bus_region bar;\n-\tint i;\n+\tint i, ret;\n+\n+\tret = security_locked_down(LOCKDOWN_PCI_ACCESS);\n+\tif (ret)\n+\t\treturn ret;\n \n \tfor (i = 0; i < PCI_STD_NUM_BARS; i++)\n \t\tif (res == &pdev->resource[i])\n","prefixes":["v4","11/24"]}