diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/timer_failure.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/timer_failure.c | 37 |
1 files changed, 29 insertions, 8 deletions
diff --git a/tools/testing/selftests/bpf/progs/timer_failure.c b/tools/testing/selftests/bpf/progs/timer_failure.c index 226d33b5a05c..0996c2486f05 100644 --- a/tools/testing/selftests/bpf/progs/timer_failure.c +++ b/tools/testing/selftests/bpf/progs/timer_failure.c @@ -21,17 +21,38 @@ struct { __type(value, struct elem); } timer_map SEC(".maps"); -static int timer_cb_ret1(void *map, int *key, struct bpf_timer *timer) +__naked __noinline __used +static unsigned long timer_cb_ret_bad() { - if (bpf_get_smp_processor_id() % 2) - return 1; - else - return 0; + asm volatile ( + "call %[bpf_get_prandom_u32];" + "if r0 s> 1000 goto 1f;" + "r0 = 0;" + "1:" + "goto +0;" /* checkpoint */ + /* async callback is expected to return 0, so branch above + * skipping r0 = 0; should lead to a failure, but if exit + * instruction doesn't enforce r0's precision, this callback + * will be successfully verified + */ + "exit;" + : + : __imm(bpf_get_prandom_u32) + : __clobber_common + ); } SEC("fentry/bpf_fentry_test1") -__failure __msg("should have been in (0x0; 0x0)") -int BPF_PROG2(test_ret_1, int, a) +__log_level(2) +__flag(BPF_F_TEST_STATE_FREQ) +__failure +/* check that fallthrough code path marks r0 as precise */ +__msg("mark_precise: frame0: regs=r0 stack= before") +__msg(": (85) call bpf_get_prandom_u32#7") /* anchor message */ +/* check that branch code path marks r0 as precise */ +__msg("mark_precise: frame0: regs=r0 stack= before ") __msg(": (85) call bpf_get_prandom_u32#7") +__msg("should have been in [0, 0]") +long BPF_PROG2(test_bad_ret, int, a) { int key = 0; struct bpf_timer *timer; @@ -39,7 +60,7 @@ int BPF_PROG2(test_ret_1, int, a) timer = bpf_map_lookup_elem(&timer_map, &key); if (timer) { bpf_timer_init(timer, &timer_map, CLOCK_BOOTTIME); - bpf_timer_set_callback(timer, timer_cb_ret1); + bpf_timer_set_callback(timer, timer_cb_ret_bad); bpf_timer_start(timer, 1000, 0); } |