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| author | Matt Mullins | 2019-06-11 23:53:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2019-07-03 13:14:48 +0200 |
| commit | a7177b94aff4febe657fe31bb7e5ecdef72079f4 (patch) | |
| tree | 06a65e780c52e1053c7cee746cbbdea0a9827148 /net | |
| parent | bpf: lpm_trie: check left child of last leftmost node for NULL (diff) | |
| download | kernel-qcow2-linux-a7177b94aff4febe657fe31bb7e5ecdef72079f4.tar.gz kernel-qcow2-linux-a7177b94aff4febe657fe31bb7e5ecdef72079f4.tar.xz kernel-qcow2-linux-a7177b94aff4febe657fe31bb7e5ecdef72079f4.zip | |
bpf: fix nested bpf tracepoints with per-cpu data
commit 9594dc3c7e71b9f52bee1d7852eb3d4e3aea9e99 upstream.
BPF_PROG_TYPE_RAW_TRACEPOINTs can be executed nested on the same CPU, as
they do not increment bpf_prog_active while executing.
This enables three levels of nesting, to support
- a kprobe or raw tp or perf event,
- another one of the above that irq context happens to call, and
- another one in nmi context
(at most one of which may be a kprobe or perf event).
Fixes: 20b9d7ac4852 ("bpf: avoid excessive stack usage for perf_sample_data")
Signed-off-by: Matt Mullins <mmullins@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions