[Linaro-mm-sig] Re: [PATCH v2] dma-buf: set SB_I_NOEXEC and SB_I_NODEV on the pseudo filesystem

On Fri, May 22, 2026 at 06:11:17PM -0700, John Hubbard wrote:

The dma-buf pseudo filesystem dispenses S_ANON_INODE inodes via alloc_anon_inode() but never sets SB_I_NOEXEC on its superblock. Since commit 1e7ab6f67824 ("anon_inode: rework assertions") in 6.17, path_noexec() warns on exactly that combination, so an mmap() on any dma-buf fd trips the warning:

Just as last time this came up, we really should set this higher up. There isn't really a reason why pseudofses should not set SB_I_NOEXEC by default.