Re: [PATCH bpf v2 1/2] bpf: support PTR_TO_MEM{,_OR_NULL} register spilling

On Wed, Jan 13, 2021 at 2:29 PM KP Singh [off-list ref] wrote:

On Wed, Jan 13, 2021 at 6:38 AM Gilad Reti [off-list ref] wrote:

quoted

Add support for pointer to mem register spilling, to allow the verifier
to track pointers to valid memory addresses. Such pointers are returned
for example by a successful call of the bpf_ringbuf_reserve helper.

The patch was partially contributed by CyberArk Software, Inc.

Fixes: 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it")
Suggested-by: Yonghong Song <redacted>
Signed-off-by: Gilad Reti <redacted>

Acked-by: KP Singh <kpsingh@kernel.org>

It's a border line feature vs fix.
Since the patch is trivial and it addresses a real problem I've
applied to the bpf tree.
Thanks!