On Mon, Jan 11, 2021, 17:55 Daniel Borkmann <daniel@xxxxxxxxxxxxx> wrote: > > Hello Gilad, > > On 1/11/21 4:31 PM, giladreti wrote: > > Added support for pointer to mem register spilling, to allow the verifier > > to track pointer to valid memory addresses. Such pointers are returned > > for example by a successful call of the bpf_ringbuf_reserve helper. > > > > This patch was suggested as a solution by Yonghong Song. > > The SoB should not be in subject line but as part of the commit message instead > and with proper name, e.g. > > Signed-off-by: Gilad Reti <gilad.reti@xxxxxxxxx> > > For subject line, please use a short summary that fits the patch prefixed with > the subsystem "bpf: [...]", see also [0] as an example. Thanks. > > It would be good if you could also add a BPF selftest for this [1]. > > [0] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=e22d7f05e445165e58feddb4e40cc9c0f94453bc > [1] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/tree/tools/testing/selftests/bpf/ > https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/tree/tools/testing/selftests/bpf/verifier/spill_fill.c > Sure. Thanks for your guidance. As you can probably tell, I am new to kernel code contribution (in fact this is a first time for me). Should I try to submit this patch again? Sorry in advance for all the overhead I may be causing to you... > > --- > > kernel/bpf/verifier.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c > > index 17270b8404f1..36af69fac591 100644 > > --- a/kernel/bpf/verifier.c > > +++ b/kernel/bpf/verifier.c > > @@ -2217,6 +2217,8 @@ static bool is_spillable_regtype(enum bpf_reg_type type) > > case PTR_TO_RDWR_BUF: > > case PTR_TO_RDWR_BUF_OR_NULL: > > case PTR_TO_PERCPU_BTF_ID: > > + case PTR_TO_MEM: > > + case PTR_TO_MEM_OR_NULL: > > return true; > > default: > > return false; > > >
