From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0D89634B1A6; Tue, 21 Jul 2026 22:13:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672030; cv=none; b=OPKReX1r9mqPzy6n9T3+g2evj69NZio/JMcqt6ZgtwoQMc2XRzl3h60CRKwAwVTfAHjLVdg31E/TquRzdS+AfSHBO9cBnrodjlfabGBn5qy1H3T8s2Pks+8ZeubxWlRk5GDInQhiEC/Yzd1Z6pI0Qm2tuBksVQt0wLgnvdywy2g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672030; c=relaxed/simple; bh=YtR5MaPFd01Gr/JOEldCa6HBT6etej5GSfbOo8U9pUQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ZIHFQ++jDYi6rgXrKrDRG/xiaIAusyFcWYiJ9G/5XkfDiB5kOM+fZ+y2Nnb0O3QR1SwGrWx5A3dtwTKo83ss3EbLFmxUKxZJv9y/WoYgP+19JzjrGuZ8l9QyCk0fpN7DxAvBpJ3yWS8g4J4mBNwVBg8uuaK4aVs9bL/YI9CCDM8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QkAR2hrZ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QkAR2hrZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A1951F000E9; Tue, 21 Jul 2026 22:13:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672028; bh=lUZLuMzNkEJx1/21VQf1b0VhQ6VW5AmXiv08OxantkI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=QkAR2hrZsw3KHjf4xQ1kvkRqvi2hrEiPozygfFSvCmN6eC8QsCVZJhu2lOjpiqtGm MF33Bls8sc9KkHDBI0OoipJrtqvPRzb2IdoC4b3XUJMaq9dKhZPE5fkOtccUF6JBP8 l91xUyz7zENU8VTFwyO1Npc/R8T2kSgm6o14aK30= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Bjorn Helgaas , Magnus Lindholm , Shivaprasad G Bhat , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sasha Levin Subject: [PATCH 5.15 470/843] alpha/PCI: Add security_locked_down() check to pci_mmap_resource() Date: Tue, 21 Jul 2026 17:21:45 +0200 Message-ID: <20260721152416.610681098@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Krzysztof Wilczyński [ Upstream commit 78a228f0aa0e9eba31955950c8a40a9945e2c8bb ] 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(). Fixes: eb627e17727e ("PCI: Lock down BAR access when the kernel is locked down") Signed-off-by: Krzysztof Wilczyński Signed-off-by: Bjorn Helgaas Tested-by: Magnus Lindholm Tested-by: Shivaprasad G Bhat Reviewed-by: Ilpo Järvinen Acked-by: Magnus Lindholm Link: https://patch.msgid.link/20260508043543.217179-12-kwilczynski@kernel.org Signed-off-by: Sasha Levin --- 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 5808a66e2a81f7..80a5fd642e7f32 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