AceLan Kao <[email protected]> 於 2026年4月13日週一 下午4:10寫道： > > Chia-Lin Kao (AceLan) <[email protected]> 於 2026年1月14日週三 上午9:19寫道： > > > > The VFS now warns if an inode flagged with S_ANON_INODE is located on a > > filesystem that does not have SB_I_NOEXEC set. dmabuf inodes are > > created using alloc_anon_inode(), which sets S_ANON_INODE. > > > > This triggers a warning in path_noexec() when a dmabuf is mmapped, for > > example by GStreamer's v4l2src element. > > > > [ 60.061328] WARNING: CPU: 2 PID: 2803 at fs/exec.c:125 > > path_noexec+0xa0/0xd0 > > ... > > [ 60.061637] do_mmap+0x2b5/0x680 > > > > The warning was introduced by commit 1e7ab6f67824 ("anon_inode: rework > > assertions") which added enforcement that anonymous inodes must be on > > filesystems with SB_I_NOEXEC set. > > > > Fix this by setting SB_I_NOEXEC and SB_I_NODEV on the dmabuf filesystem > > context, following the same pattern as commit ce7419b6cf23d ("anon_inode: > > raise SB_I_NODEV and SB_I_NOEXEC") and commit 98f99394a104c ("secretmem: > > use SB_I_NOEXEC"). > > > > Signed-off-by: Chia-Lin Kao (AceLan) <[email protected]> > > --- > > drivers/dma-buf/dma-buf.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c > > index a4d8f2ff94e46..dea79aaab10ce 100644 > > --- a/drivers/dma-buf/dma-buf.c > > +++ b/drivers/dma-buf/dma-buf.c > > @@ -221,6 +221,8 @@ static int dma_buf_fs_init_context(struct fs_context > > *fc) > > if (!ctx) > > return -ENOMEM; > > ctx->dops = &dma_buf_dentry_ops; > > + fc->s_iflags |= SB_I_NOEXEC; > > + fc->s_iflags |= SB_I_NODEV; > > return 0; > > } > > > > -- > > 2.51.0 > > > Hi all, > > Please help to review this patch. > It does the same thing as > ce7419b6cf23d ("anon_inode: raise SB_I_NODEV and SB_I_NOEXEC") > and > 98f99394a104c ("secretmem: use SB_I_NOEXEC") > Thanks.
A gentle ping -- Chia-Lin Kao(AceLan) http://blog.acelan.idv.tw/ E-Mail: acelan.kaoATcanonical.com (s/AT/@/)
