diff options
| author | Amir Goldstein <amir73il@gmail.com> | 2025-07-10 12:08:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-19 16:35:46 +0200 |
| commit | 30814d40fc8af1a1a24ac5c996220dc591f6b47d (patch) | |
| tree | 4bc1a94aa81285014ece293b8ce8963be2456ce1 | |
| parent | b6f8cd737b70ff414bd6b710d7b0408f91e00b36 (diff) | |
fuse: do not allow mapping a non-regular backing file
commit e9c8da670e749f7dedc53e3af54a87b041918092 upstream.
We do not support passthrough operations other than read/write on
regular file, so allowing non-regular backing files makes no sense.
Fixes: efad7153bf93 ("fuse: allow O_PATH fd for FUSE_DEV_IOC_BACKING_OPEN")
Cc: stable@vger.kernel.org
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Bernd Schubert <bschubert@ddn.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/fuse/passthrough.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c index bbac547dfcb3..6bfd09dda9e3 100644 --- a/fs/fuse/passthrough.c +++ b/fs/fuse/passthrough.c @@ -233,6 +233,11 @@ int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map) if (!file) goto out; + /* read/write/splice/mmap passthrough only relevant for regular files */ + res = d_is_dir(file->f_path.dentry) ? -EISDIR : -EINVAL; + if (!d_is_reg(file->f_path.dentry)) + goto out_fput; + backing_sb = file_inode(file)->i_sb; res = -ELOOP; if (backing_sb->s_stack_depth >= fc->max_stack_depth) |