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| author | Alexei Starovoitov <ast@kernel.org> | 2020-01-15 22:44:51 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-01-15 22:46:32 +0300 |
| commit | 5640a771d7971412049d1934d2d030edfdd1c28e (patch) | |
| tree | e68ec27387482ff400e4f7b7212eae6f6941e6ac /include/uapi/linux | |
| parent | d3a56931f9c8644a52e7a6735954c84ea895e8c3 (diff) | |
| parent | ab8b7f0cb3585ecb40e3305850f28658a1b8940e (diff) | |
| download | linux-5640a771d7971412049d1934d2d030edfdd1c28e.tar.xz | |
Merge branch 'bpf_send_signal_thread'
Yonghong Song says:
====================
Commit 8b401f9ed244 ("bpf: implement bpf_send_signal() helper")
added helper bpf_send_signal() which permits bpf program to
send a signal to the current process. The signal may send to
any thread of the process.
This patch implemented a new helper bpf_send_signal_thread()
to send a signal to the thread corresponding to the kernel current task.
This helper can simplify user space code if the thread context of
bpf sending signal is needed in user space. Please see Patch #1 for
details of use case and kernel implementation.
Patch #2 added some bpf self tests for the new helper.
Changelogs:
v2 -> v3:
- More simplification for skeleton codes by removing not-needed
mmap code and redundantly created tracepoint link.
v1 -> v2:
- More description for the difference between bpf_send_signal()
and bpf_send_signal_thread() in the uapi header bpf.h.
- Use skeleton and mmap for send_signal test.
====================
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/bpf.h | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 52966e758fe5..a88837d4dd18 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -2714,7 +2714,8 @@ union bpf_attr { * * int bpf_send_signal(u32 sig) * Description - * Send signal *sig* to the current task. + * Send signal *sig* to the process of the current task. + * The signal may be delivered to any of this process's threads. * Return * 0 on success or successfully queued. * @@ -2850,6 +2851,19 @@ union bpf_attr { * Return * 0 on success, or a negative error in case of failure. * + * int bpf_send_signal_thread(u32 sig) + * Description + * Send signal *sig* to the thread corresponding to the current task. + * Return + * 0 on success or successfully queued. + * + * **-EBUSY** if work queue under nmi is full. + * + * **-EINVAL** if *sig* is invalid. + * + * **-EPERM** if no permission to send the *sig*. + * + * **-EAGAIN** if bpf program can try again. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -2968,7 +2982,8 @@ union bpf_attr { FN(probe_read_kernel), \ FN(probe_read_user_str), \ FN(probe_read_kernel_str), \ - FN(tcp_send_ack), + FN(tcp_send_ack), \ + FN(send_signal_thread), /* integer value in 'imm' field of BPF_CALL instruction selects which helper * function eBPF program intends to call |