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selftests/bpf: make sure signal interrupts BPF_PROG_TEST_RUN

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Simple test that I used to reproduce the issue in the previous commit:
Do BPF_PROG_TEST_RUN with max iterations, each program is 4096 simple
move instructions. File alarm in 0.1 second and check that
bpf_prog_test_run is interrupted (i.e. test doesn't hang).

Note: reposting this for bpf-next to avoid linux-next conflict. In this
version I test both BPF_PROG_TYPE_SOCKET_FILTER (which uses generic
bpf_test_run implementation) and BPF_PROG_TYPE_FLOW_DISSECTOR (which has
it own loop with preempt handling in bpf_prog_test_run_flow_dissector).

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Stanislav Fomichev 2019-02-21 11:11:00 -08:00 committed by Daniel Borkmann
parent a439184d51
commit 740f8a6572
1 changed files with 44 additions and 0 deletions
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44
tools/testing/selftests/bpf/test_progs.c
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@ -12,6 +12,7 @@
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#include <signal.h>
#include <linux/types.h>
typedef __u16 __sum16;
@ -28,6 +29,7 @@ typedef __u16 __sum16;
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/time.h>
#include <fcntl.h>
#include <pthread.h>
#include <linux/bpf.h>
@ -2108,6 +2110,46 @@ close_prog_noerr:
bpf_object__close(obj);
}
static void sigalrm_handler(int s) {}
static struct sigaction sigalrm_action = {
.sa_handler = sigalrm_handler,
};
static void test_signal_pending(enum bpf_prog_type prog_type)
{
struct bpf_insn prog[4096];
struct itimerval timeo = {
.it_value.tv_usec = 100000, /* 100ms */
};
__u32 duration, retval;
int prog_fd;
int err;
int i;
for (i = 0; i < ARRAY_SIZE(prog); i++)
prog[i] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0);
prog[ARRAY_SIZE(prog) - 1] = BPF_EXIT_INSN();
prog_fd = bpf_load_program(prog_type, prog, ARRAY_SIZE(prog),
"GPL", 0, NULL, 0);
CHECK(prog_fd < 0, "test-run", "errno %d\n", errno);
err = sigaction(SIGALRM, &sigalrm_action, NULL);
CHECK(err, "test-run-signal-sigaction", "errno %d\n", errno);
err = setitimer(ITIMER_REAL, &timeo, NULL);
CHECK(err, "test-run-signal-timer", "errno %d\n", errno);
err = bpf_prog_test_run(prog_fd, 0xffffffff, &pkt_v4, sizeof(pkt_v4),
NULL, NULL, &retval, &duration);
CHECK(duration > 500000000, /* 500ms */
"test-run-signal-duration",
"duration %dns > 500ms\n",
duration);
signal(SIGALRM, SIG_DFL);
}
int main(void)
{
srand(time(NULL));
@ -2138,6 +2180,8 @@ int main(void)
test_flow_dissector();
test_spinlock();
test_map_lock();
test_signal_pending(BPF_PROG_TYPE_SOCKET_FILTER);
test_signal_pending(BPF_PROG_TYPE_FLOW_DISSECTOR);
printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;