Re: [PATCH] fsverity: Fix bpf_get_fsverity_digest() dynptr assumptions
Eric Biggers <[email protected]> Sat, 1 Aug 2026 10:15:49 -0700
| Newsgroups | dev.linux.lists.fsverity,org.kernel.vger.bpf,org.kernel.vger.linux-kernel,org.kernel.vger.stable |
|---|---|
| Message-ID | <20260801171549.GB3567@quark> |
On Sat, Aug 01, 2026 at 06:52:45PM +0200, Kumar Kartikeya Dwivedi wrote: > > Also correctly handle sizes over INT_MAX, which previously caused an > > integer overflow and crash. __bpf_dynptr_size() returns a u64. > > > > I guess this occurs when using file dynptrs? Otherwise the size is capped to > DYNPTR_SIZE_MASK. Yes, though it looks like __bpf_dynptr_data_rw() excludes file dynptrs. So this particular issue might be unreachable. Still seems like a good idea to match the u64 type that __bpf_dynptr_size() returns though. - Eric