16f0efc3b4
The test covered both nmi and tracepoint perf events. $ ./test_progs ... test_send_signal_tracepoint:PASS:tracepoint 0 nsec ... test_send_signal_common:PASS:tracepoint 0 nsec ... test_send_signal_common:PASS:perf_event 0 nsec ... test_send_signal:OK Acked-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (c) 2019 Facebook
|
|
#include <linux/bpf.h>
|
|
#include <linux/version.h>
|
|
#include "bpf_helpers.h"
|
|
|
|
struct bpf_map_def SEC("maps") info_map = {
|
|
.type = BPF_MAP_TYPE_ARRAY,
|
|
.key_size = sizeof(__u32),
|
|
.value_size = sizeof(__u64),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
BPF_ANNOTATE_KV_PAIR(info_map, __u32, __u64);
|
|
|
|
struct bpf_map_def SEC("maps") status_map = {
|
|
.type = BPF_MAP_TYPE_ARRAY,
|
|
.key_size = sizeof(__u32),
|
|
.value_size = sizeof(__u64),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
BPF_ANNOTATE_KV_PAIR(status_map, __u32, __u64);
|
|
|
|
SEC("send_signal_demo")
|
|
int bpf_send_signal_test(void *ctx)
|
|
{
|
|
__u64 *info_val, *status_val;
|
|
__u32 key = 0, pid, sig;
|
|
int ret;
|
|
|
|
status_val = bpf_map_lookup_elem(&status_map, &key);
|
|
if (!status_val || *status_val != 0)
|
|
return 0;
|
|
|
|
info_val = bpf_map_lookup_elem(&info_map, &key);
|
|
if (!info_val || *info_val == 0)
|
|
return 0;
|
|
|
|
sig = *info_val >> 32;
|
|
pid = *info_val & 0xffffFFFF;
|
|
|
|
if ((bpf_get_current_pid_tgid() >> 32) == pid) {
|
|
ret = bpf_send_signal(sig);
|
|
if (ret == 0)
|
|
*status_val = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
char __license[] SEC("license") = "GPL";
|