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| author | Alexei Starovoitov <ast@kernel.org> | 2023-04-04 07:50:25 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2023-04-05 02:57:16 +0300 |
| commit | 91571a515d1bcdc280bb46423bb697ea7eb42ff3 (patch) | |
| tree | 636320a1ffcdd78b5091e70cca1f5f1353472aef /tools/perf/scripts/python/flamegraph.py | |
| parent | 63260df1396578226ac3134cf7f764690002e70e (diff) | |
| download | linux-91571a515d1bcdc280bb46423bb697ea7eb42ff3.tar.xz | |
bpf: Teach verifier that certain helpers accept NULL pointer.
bpf_[sk|inode|task|cgrp]_storage_[get|delete]() and bpf_get_socket_cookie() helpers
perform run-time check that sk|inode|task|cgrp pointer != NULL.
Teach verifier about this fact and allow bpf programs to pass
PTR_TO_BTF_ID | PTR_MAYBE_NULL into such helpers.
It will be used in the subsequent patch that will do
bpf_sk_storage_get(.., skb->sk, ...);
Even when 'skb' pointer is trusted the 'sk' pointer may be NULL.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/bpf/20230404045029.82870-5-alexei.starovoitov@gmail.com
Diffstat (limited to 'tools/perf/scripts/python/flamegraph.py')
0 files changed, 0 insertions, 0 deletions