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 6C81D3C10AB; Tue, 21 Jul 2026 22:47:10 +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=1784674031; cv=none; b=RCpALS7pd5JANVzOyPHbAXRkm/QtbrDG5Cz/JCYv2dUNFUF5vbfehL0XUDypfltlgFPb5KEPig6GWkMBOLIBZ6MJ/IhkhdOYmijEbxkvKYQEGsSePUw2v147OJbwBGsp811VM1qTtTLI5EEXMb/G9SDImWAzPanPp5D794m9Zsw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784674031; c=relaxed/simple; bh=HSBxoWH35hE4W3Ivq5B+KnVOcjr7H35nqg+1m/kovAU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ScAqJRpVJbdg0w397FC7361PlfuHkVfVV7vKYmB2AmmBhihJu2cgvnkG2EW9TQiopCv2ANtvZGj8F9Z3zlcLSRqXH6XmZGmhON8CYn2zm7TnvWNNeI2PMtwj8r01td+DmW2DcOCehgYP9T+qZczWK5aG8M3+W8KZ68c9rEoMgTk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fzmtaL4M; 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="fzmtaL4M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D52F31F000E9; Tue, 21 Jul 2026 22:47:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784674030; bh=L/H24EHLB3dexi4/hpq0lr+4PlcBSCTnBJQAAYdDeDw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fzmtaL4Msth7r/kwUhPLkCB/LhfnKagBr/XtY+5IsOkGJSoDW7AP7hqC0ylXwdto1 hGdbp6CdWopo+9k09BrpTlgGU3ryQdoYWQyT85tm99uGKhRpICdmbKMSAgdXeqHJQB lmgHrwpb42OR+xJklLSayY1xLdYcI+IYv1DPHTMA= 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 5.10 360/699] alpha/PCI: Add security_locked_down() check to pci_mmap_resource() Date: Tue, 21 Jul 2026 17:21:59 +0200 Message-ID: <20260721152403.812346924@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152355.667394603@linuxfoundation.org> References: <20260721152355.667394603@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.10-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 0021580d79adbd..f1fd9543067424 100644 --- a/arch/alpha/kernel/pci-sysfs.c +++ b/arch/alpha/kernel/pci-sysfs.c @@ -11,6 +11,7 @@ */ #include +#include #include #include #include @@ -69,7 +70,11 @@ 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