diff options
| author | Amir Goldstein <amir73il@gmail.com> | 2023-11-23 18:51:44 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-11-24 09:22:28 +0100 |
| commit | d53471ba6f7ae97a4e223539029528108b705af1 (patch) | |
| tree | 60635c7a772a2c32e5cbb1d4a0fe1e22821e50bc | |
| parent | b70d8e2b8ce56c79d9d18d20955e6de1631e9509 (diff) | |
splice: remove permission hook from iter_file_splice_write()
All the callers of ->splice_write(), (e.g. do_splice_direct() and
do_splice()) already check rw_verify_area() for the entire range
and perform all the other checks that are in vfs_write_iter().
Instead of creating another tiny helper for special caller, just
open-code it.
This is needed for fanotify "pre content" events.
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20231122122715.2561213-6-amir73il@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
| -rw-r--r-- | fs/splice.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/splice.c b/fs/splice.c index d4fdd44c0b32..3fce5f6072dd 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -673,10 +673,13 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out, .u.file = out, }; int nbufs = pipe->max_usage; - struct bio_vec *array = kcalloc(nbufs, sizeof(struct bio_vec), - GFP_KERNEL); + struct bio_vec *array; ssize_t ret; + if (!out->f_op->write_iter) + return -EINVAL; + + array = kcalloc(nbufs, sizeof(struct bio_vec), GFP_KERNEL); if (unlikely(!array)) return -ENOMEM; @@ -684,6 +687,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out, splice_from_pipe_begin(&sd); while (sd.total_len) { + struct kiocb kiocb; struct iov_iter from; unsigned int head, tail, mask; size_t left; @@ -733,7 +737,10 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out, } iov_iter_bvec(&from, ITER_SOURCE, array, n, sd.total_len - left); - ret = vfs_iter_write(out, &from, &sd.pos, 0); + init_sync_kiocb(&kiocb, out); + kiocb.ki_pos = sd.pos; + ret = call_write_iter(out, &kiocb, &from); + sd.pos = kiocb.ki_pos; if (ret <= 0) break; |