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| author | Matt Mullins <mmullins@fb.com> | 2019-04-26 11:49:47 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-04-26 19:04:19 -0700 |
| commit | 9df1c28bb75217b244257152ab7d788bb2a386d0 (patch) | |
| tree | 7fe10ffd9b59716b52b992f5663ec8b5102406b6 /include/uapi/linux/bpf.h | |
| parent | 34b8ab091f9ef57a2bb3c8c8359a0a03a8abf2f9 (diff) | |
| download | linux-next-9df1c28bb75217b244257152ab7d788bb2a386d0.tar.gz | |
bpf: add writable context for raw tracepoints
This is an opt-in interface that allows a tracepoint to provide a safe
buffer that can be written from a BPF_PROG_TYPE_RAW_TRACEPOINT program.
The size of the buffer must be a compile-time constant, and is checked
before allowing a BPF program to attach to a tracepoint that uses this
feature.
The pointer to this buffer will be the first argument of tracepoints
that opt in; the pointer is valid and can be bpf_probe_read() by both
BPF_PROG_TYPE_RAW_TRACEPOINT and BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE
programs that attach to such a tracepoint, but the buffer to which it
points may only be written by the latter.
Signed-off-by: Matt Mullins <mmullins@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/uapi/linux/bpf.h')
| -rw-r--r-- | include/uapi/linux/bpf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index eaf2d3284248..f7fa7a34a62d 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -168,6 +168,7 @@ enum bpf_prog_type { BPF_PROG_TYPE_SK_REUSEPORT, BPF_PROG_TYPE_FLOW_DISSECTOR, BPF_PROG_TYPE_CGROUP_SYSCTL, + BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, }; enum bpf_attach_type { |