@@ -216,6 +216,7 @@ static void *(*bpf_sk_storage_get)(void *map, struct bpf_sock *sk,
(void *) BPF_FUNC_sk_storage_get;
static int (*bpf_sk_storage_delete)(void *map, struct bpf_sock *sk) =
(void *)BPF_FUNC_sk_storage_delete;
+static int (*bpf_send_signal)(unsigned sig) = (void *)BPF_FUNC_send_signal;
/* llvm builtin functions that eBPF C program may use to
* emit BPF_LD_ABS and BPF_LD_IND instructions
new file mode 100644
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+
+static volatile int sigusr1_received = 0;
+
+static void sigusr1_handler(int signum)
+{
+ sigusr1_received++;
+}
+
+static int test_send_signal_common(struct perf_event_attr *attr,
+ int prog_type,
+ const char *test_name)
+{
+ int err = -1, pmu_fd, prog_fd, info_map_fd, status_map_fd;
+ const char *file = "./test_send_signal_kern.o";
+ struct bpf_object *obj = NULL;
+ int pipe_c2p[2], pipe_p2c[2];
+ __u32 key = 0, duration = 0;
+ char buf[256];
+ pid_t pid;
+ __u64 val;
+
+ if (CHECK(pipe(pipe_c2p), test_name,
+ "pipe pipe_c2p error: %s\n", strerror(errno)))
+ goto no_fork_done;
+
+ if (CHECK(pipe(pipe_p2c), test_name,
+ "pipe pipe_p2c error: %s\n", strerror(errno))) {
+ close(pipe_c2p[0]);
+ close(pipe_c2p[1]);
+ goto no_fork_done;
+ }
+
+ pid = fork();
+ if (CHECK(pid < 0, test_name, "fork error: %s\n", strerror(errno))) {
+ close(pipe_c2p[0]);
+ close(pipe_c2p[1]);
+ close(pipe_p2c[0]);
+ close(pipe_p2c[1]);
+ goto no_fork_done;
+ }
+
+ if (pid == 0) {
+ /* install signal handler and notify parent */
+ signal(SIGUSR1, sigusr1_handler);
+
+ close(pipe_c2p[0]); /* close read */
+ close(pipe_p2c[1]); /* close write */
+
+ /* notify parent signal handler is installed */
+ write(pipe_c2p[1], buf, 1);
+
+ /* make sure parent enabled bpf program to send_signal */
+ read(pipe_p2c[0], buf, 1);
+
+ /* wait a little for signal handler */
+ sleep(1);
+
+ if (sigusr1_received)
+ write(pipe_c2p[1], "2", 1);
+ else
+ write(pipe_c2p[1], "0", 1);
+
+ /* wait for parent notification and exit */
+ read(pipe_p2c[0], buf, 1);
+
+ close(pipe_c2p[1]);
+ close(pipe_p2c[0]);
+ exit(0);
+ }
+
+ close(pipe_c2p[1]); /* close write */
+ close(pipe_p2c[0]); /* close read */
+
+ err = bpf_prog_load(file, prog_type, &obj, &prog_fd);
+ if (CHECK(err < 0, test_name, "bpf_prog_load error: %s\n",
+ strerror(errno)))
+ goto prog_load_failure;
+
+ pmu_fd = syscall(__NR_perf_event_open, attr, pid, -1,
+ -1 /* group id */, 0 /* flags */);
+ if (CHECK(pmu_fd < 0, test_name, "perf_event_open error: %s\n",
+ strerror(errno))) {
+ err = -1;
+ goto close_prog;
+ }
+
+ err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
+ if (CHECK(err < 0, test_name, "ioctl perf_event_ioc_enable error: %s\n",
+ strerror(errno)))
+ goto disable_pmu;
+
+ err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
+ if (CHECK(err < 0, test_name, "ioctl perf_event_ioc_set_bpf error: %s\n",
+ strerror(errno)))
+ goto disable_pmu;
+
+ err = -1;
+ info_map_fd = bpf_object__find_map_fd_by_name(obj, "info_map");
+ if (CHECK(info_map_fd < 0, test_name, "find map %s error\n", "info_map"))
+ goto disable_pmu;
+
+ status_map_fd = bpf_object__find_map_fd_by_name(obj, "status_map");
+ if (CHECK(status_map_fd < 0, test_name, "find map %s error\n", "status_map"))
+ goto disable_pmu;
+
+ /* wait until child signal handler installed */
+ read(pipe_c2p[0], buf, 1);
+
+ /* trigger the bpf send_signal */
+ key = 0;
+ val = (((__u64)(SIGUSR1)) << 32) | pid;
+ bpf_map_update_elem(info_map_fd, &key, &val, 0);
+
+ /* notify child that bpf program can send_signal now */
+ write(pipe_p2c[1], buf, 1);
+
+ /* wait for result */
+ read(pipe_c2p[0], buf, 1);
+
+ err = CHECK(buf[0] != '2', test_name, "incorrect result\n");
+
+ /* notify child safe to exit */
+ write(pipe_p2c[1], buf, 1);
+
+disable_pmu:
+ close(pmu_fd);
+close_prog:
+ bpf_object__close(obj);
+prog_load_failure:
+ close(pipe_c2p[0]);
+ close(pipe_p2c[1]);
+ wait(NULL);
+no_fork_done:
+ return err;
+}
+
+static int test_send_signal_tracepoint(void)
+{
+ const char *id_path = "/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id";
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_TRACEPOINT,
+ .sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN,
+ .sample_period = 1,
+ .wakeup_events = 1,
+ };
+ __u32 duration = 0;
+ int bytes, efd;
+ char buf[256];
+
+ efd = open(id_path, O_RDONLY, 0);
+ if (CHECK(efd < 0, "tracepoint",
+ "open syscalls/sys_enter_nanosleep/id failure: %s\n",
+ strerror(errno)))
+ return -1;
+
+ bytes = read(efd, buf, sizeof(buf));
+ close(efd);
+ if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "tracepoint",
+ "read syscalls/sys_enter_nanosleep/id failure: %s\n",
+ strerror(errno)))
+ return -1;
+
+ attr.config = strtol(buf, NULL, 0);
+
+ return test_send_signal_common(&attr, BPF_PROG_TYPE_TRACEPOINT, "tracepoint");
+}
+
+static int test_send_signal_nmi(void)
+{
+ struct perf_event_attr attr = {
+ .sample_freq = 50,
+ .freq = 1,
+ .type = PERF_TYPE_HARDWARE,
+ .config = PERF_COUNT_HW_CPU_CYCLES,
+ };
+
+ return test_send_signal_common(&attr, BPF_PROG_TYPE_PERF_EVENT, "perf_event");
+}
+
+void test_send_signal(void)
+{
+ int ret = 0;
+
+ ret |= test_send_signal_tracepoint();
+ ret |= test_send_signal_nmi();
+ if (!ret)
+ printf("test_send_signal:OK\n");
+ else
+ printf("test_send_signal:FAIL\n");
+}
new file mode 100644
@@ -0,0 +1,51 @@
+// 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";