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selftests/bpf: fix selftest after random: Urandom_read tracepoint removal

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[ Upstream commit 99dea2c664d7bc7e4f6f6947182d0d365165a998 ]

14c174633f34 ("random: remove unused tracepoints") removed all the
tracepoints from drivers/char/random.c, one of which,
random:urandom_read, was used by stacktrace_build_id selftest to trigger
stack trace capture.

Fix breakage by switching to kprobing urandom_read() function.

Suggested-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220325225643.2606-1-andrii@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrii Nakryiko 2022-03-25 15:56:43 -07:00 committed by Greg Kroah-Hartman
parent 5ff2514e4f
commit 8969c3b105
1 changed files with 2 additions and 10 deletions
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12
tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c
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@ -39,16 +39,8 @@ struct {
__type(value, stack_trace_t);
} stack_amap SEC(".maps");
/* taken from /sys/kernel/debug/tracing/events/random/urandom_read/format */
struct random_urandom_args {
unsigned long long pad;
int got_bits;
int pool_left;
int input_left;
};
SEC("tracepoint/random/urandom_read")
int oncpu(struct random_urandom_args *args)
SEC("kprobe/urandom_read")
int oncpu(struct pt_regs *args)
{
__u32 max_len = sizeof(struct bpf_stack_build_id)
* PERF_MAX_STACK_DEPTH;