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| author | Amir Goldstein <amir73il@gmail.com> | 2025-07-10 12:08:30 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2025-08-26 12:43:31 +0200 |
| commit | e9c8da670e749f7dedc53e3af54a87b041918092 (patch) | |
| tree | 10365d6dcb523866db1fe7424ce8422dfdcc7c0b /fs/fuse | |
| parent | Linux 6.17-rc3 (diff) | |
| download | linux-e9c8da670e749f7dedc53e3af54a87b041918092.tar.gz linux-e9c8da670e749f7dedc53e3af54a87b041918092.zip | |
fuse: do not allow mapping a non-regular backing file
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>
Diffstat (limited to 'fs/fuse')
| -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 607ef735ad4a..eb97ac009e75 100644 --- a/fs/fuse/passthrough.c +++ b/fs/fuse/passthrough.c @@ -237,6 +237,11 @@ 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) |