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| author | Miklos Szeredi <[email protected]> | 2025-08-12 12:46:34 +0000 |
|---|---|---|
| committer | Miklos Szeredi <[email protected]> | 2025-08-26 10:43:31 +0000 |
| commit | 1e08938c3694f707bb165535df352ac97a8c75c9 (patch) | |
| tree | 49d4361c8cc5595312c64b4a7743b59d709aafbd /tools/testing/selftests/filesystems/utils.c | |
| parent | fuse: check if copy_file_range() returns larger than requested size (diff) | |
| download | kernel-1e08938c3694f707bb165535df352ac97a8c75c9.tar.gz kernel-1e08938c3694f707bb165535df352ac97a8c75c9.zip | |
fuse: prevent overflow in copy_file_range return value
The FUSE protocol uses struct fuse_write_out to convey the return value of
copy_file_range, which is restricted to uint32_t. But the COPY_FILE_RANGE
interface supports a 64-bit size copies.
Currently the number of bytes copied is silently truncated to 32-bit, which
may result in poor performance or even failure to copy in case of
truncation to zero.
Reported-by: Florian Weimer <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Fixes: 88bc7d5097a1 ("fuse: add support for copy_file_range()")
Cc: <[email protected]> # v4.20
Signed-off-by: Miklos Szeredi <[email protected]>
Diffstat (limited to 'tools/testing/selftests/filesystems/utils.c')
0 files changed, 0 insertions, 0 deletions