[{"id":3674623,"web_url":"http://patchwork.ozlabs.org/comment/3674623/","msgid":"<3be31c94-ed41-40f6-89b2-029a6bd3d37b@canonical.com>","list_archive_url":null,"date":"2026-04-08T07:37:37","subject":"ACK: [SRU][R][PATCH 0/1] dma-buf filesystem flags fix","submitter":{"id":92836,"url":"http://patchwork.ozlabs.org/api/people/92836/","name":"Yufeng Gao","email":"yufeng.gao@canonical.com"},"content":"On 8/4/26 10:32, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n>\n> BugLink: https://bugs.launchpad.net/bugs/2139656\n>\n> [Impact]\n> The VFS layer now enforces that inodes flagged with S_ANON_INODE must be located on\n> filesystems with the SB_I_NOEXEC flag set. The dmabuf (Direct Memory Access Buffer)\n> filesystem creates inodes using alloc_anon_inode(), which sets the S_ANON_INODE flag\n> but does not set SB_I_NOEXEC and SB_I_NODEV on the filesystem.\n>\n> This causes a kernel warning when a dmabuf is memory-mapped, which can occur in\n> multimedia applications such as GStreamer's v4l2src (Video4Linux source) element.\n> The warning does not cause a crash but indicates a VFS policy violation that will\n> eventually become a fatal error in future kernel versions.\n>\n> Error log:\n> ```\n> [ 60.061328] WARNING: CPU: 2 PID: 2803 at fs/exec.c:125 path_noexec+0xa0/0xd0\n> ...\n> [ 60.061637] do_mmap+0x2b5/0x680\n> ```\n>\n> Affected scenarios: Any system running multimedia applications that use video capture\n> or memory-mapped dmabuf operations, particularly with Video4Linux source elements or\n> similar hardware-accelerated media processing.\n>\n> [Fix]\n> Set the SB_I_NOEXEC and SB_I_NODEV flags on the dmabuf filesystem context. This follows\n> the same pattern previously applied to other anonymous inode filesystems such as\n> secretmem (commit 98f99394a104c) and the anon_inode filesystem (commit ce7419b6cf23d).\n>\n> The fix is minimal - adding two flag assignments in drivers/dma-buf/dma-buf.c:\n> - fc->s_iflags |= SB_I_NOEXEC;\n> - fc->s_iflags |= SB_I_NODEV;\n>\n> These changes align the dmabuf filesystem with the VFS enforcement introduced in\n> commit 1e7ab6f67824 (\"anon_inode: rework assertions\").\n>\n> Upstream patch: https://lore.kernel.org/lkml/20260114011917.241196-1-acelan.kao@canonical.com/\n>\n> [Test Plan]\n> 1. Install a system with a video capture device (USB webcam, integrated camera, or\n> Video4Linux-compatible device)\n>\n> 2. Install GStreamer and the v4l2src plugin:\n> $ sudo apt-get install gstreamer1.0-plugins-good gstreamer1.0-plugins-base\n>\n> 3. Run a GStreamer pipeline that uses v4l2src to capture video:\n> $ gst-launch-1.0 v4l2src ! video/x-raw, width=640, height=480, framerate=30/1 ! videoconvert ! autovideosink\n>\n> 4. Check the kernel log for warnings:\n> $ dmesg | grep -i \"path_noexec\\|SB_I_NOEXEC\"\n>\n> Expected result without fix:\n> - WARNING message appears in dmesg at fs/exec.c:125 (path_noexec+0xa0/0xd0)\n> indicating anonymous inode on non-compliant filesystem\n>\n> Expected result with fix:\n> - No warning appears; video capture works correctly without VFS policy violations\n>\n> [Where problems could occur]\n> The dmabuf filesystem itself could be affected if the SB_I_NOEXEC or SB_I_NODEV flags\n> cause unexpected behavior with the filesystem's inode operations.\n>\n> If there are edge cases where the dmabuf filesystem needs to allow execution or device\n> access for specific operations, this fix could prevent those operations from working.\n> Symptoms would include dmabuf allocations failing, memory mapping failing, or hardware\n> acceleration features becoming unavailable.\n>\n> The SB_I_NODEV flag prevents device node creation on the filesystem (which should never\n> occur on a pseudo-filesystem), and SB_I_NOEXEC prevents execution (which is the correct\n> behavior for a memory buffer filesystem). These are defensive flags used by all\n> similar anonymous inode filesystems, so the regression risk is minimal, but if there\n> are hidden dependencies on the absence of these flags, dmabuf clients could fail.\n>\n> Monitor for:\n> - Memory mapping failures in applications using dmabuf\n> - Failures to create dmabuf file descriptors\n> - DMA operations failing to map memory regions\n> - Video capture or media acceleration features becoming unavailable\n>\n> [Other Info]\n> This is a backport of a fix for the upstream kernel. The patch follows the exact\n> approach used in previous commits to other anonymous inode filesystems:\n> - commit 98f99394a104c (\"secretmem: use SB_I_NOEXEC\")\n> - commit ce7419b6cf23d (\"anon_inode: raise SB_I_NODEV and SB_I_NOEXEC\")\n>\n> The warning was introduced by commit 1e7ab6f67824 (\"anon_inode: rework assertions\")\n> which added enforcement in the VFS layer that anonymous inodes must have these flags\n> set on their host filesystem.\n>\n> Chia-Lin Kao (AceLan) (1):\n> UBUNTU: SAUCE: dma-buf: set SB_I_NOEXEC and SB_I_NODEV on dmabuf\n> filesystem\n>\n> drivers/dma-buf/dma-buf.c | 2 ++\n> 1 file changed, 2 insertions(+)\n>\nAcked-by: Yufeng Gao ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=IFWhx8H+;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "}},{"id":3674672,"web_url":"http://patchwork.ozlabs.org/comment/3674672/","msgid":"","list_archive_url":null,"date":"2026-04-08T09:23:57","subject":"Re: [SRU][R][PATCH 0/1] dma-buf filesystem flags fix","submitter":{"id":7245,"url":"http://patchwork.ozlabs.org/api/people/7245/","name":"Paolo Pisati","email":"paolo.pisati@canonical.com"},"content":"On Wed, Apr 08, 2026 at 08:32:37AM +0800, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n> \n> BugLink: https://bugs.launchpad.net/bugs/2139656\n\nApplied.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=TeE2Sryc;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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