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fuse: fix pipe buffer lifetime for direct_io

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In FOPEN_DIRECT_IO mode, fuse_file_write_iter() calls
fuse_direct_write_iter(), which normally calls fuse_direct_io(), which then
imports the write buffer with fuse_get_user_pages(), which uses
iov_iter_get_pages() to grab references to userspace pages instead of
actually copying memory.

On the filesystem device side, these pages can then either be read to
userspace (via fuse_dev_read()), or splice()d over into a pipe using
fuse_dev_splice_read() as pipe buffers with &nosteal_pipe_buf_ops.

This is wrong because after fuse_dev_do_read() unlocks the FUSE request,
the userspace filesystem can mark the request as completed, causing write()
to return. At that point, the userspace filesystem should no longer have
access to the pipe buffer.

Fix by copying pages coming from the user address space to new pipe
buffers.

Reported-by: Jann Horn <jannh@google.com>
Fixes: c3021629a0 ("fuse: support splice() reading from fuse device")
Cc: <stable@vger.kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2022-03-07 16:30:44 +01:00
parent c086df4902
commit 0c4bcfdecb
3 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/fuse/dev.c
View File

@ -941,7 +941,17 @@ static int fuse_copy_page(struct fuse_copy_state *cs, struct page **pagep,
while (count) {
if (cs->write && cs->pipebufs && page) {
return fuse_ref_page(cs, page, offset, count);
/*
* Can't control lifetime of pipe buffers, so always
* copy user pages.
*/
if (cs->req->args->user_pages) {
err = fuse_copy_fill(cs);
if (err)
return err;
} else {
return fuse_ref_page(cs, page, offset, count);
}
} else if (!cs->len) {
if (cs->move_pages && page &&
offset == 0 && count == PAGE_SIZE) {

1
fs/fuse/file.c
View File

@ -1413,6 +1413,7 @@ static int fuse_get_user_pages(struct fuse_args_pages *ap, struct iov_iter *ii,
(PAGE_SIZE - ret) & (PAGE_SIZE - 1);
}
ap->args.user_pages = true;
if (write)
ap->args.in_pages = true;
else

1
fs/fuse/fuse_i.h
View File

@ -256,6 +256,7 @@ struct fuse_args {
bool nocreds:1;
bool in_pages:1;
bool out_pages:1;
bool user_pages:1;
bool out_argvar:1;
bool page_zeroing:1;
bool page_replace:1;