bpf: zero out build_id for BPF_STACK_BUILD_ID_IP

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When returning BPF_STACK_BUILD_ID_IP from stack_map_get_build_id_offset,
make sure that build_id field is empty. Since we are using percpu
free list, there is a possibility that we might reuse some previous
bpf_stack_build_id with non-zero build_id.

Fixes: 615755a77b ("bpf: extend stackmap to save binary_build_id+offset instead of address")
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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Stanislav Fomichev 2019-01-16 14:03:16 -08:00 • committed by Daniel Borkmann

parent 0b698005a9

commit 4af396ae48

1 changed files with 2 additions and 0 deletions

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kernel/bpf/stackmap.c

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