From 4bd11e08e0bb1862fe72495014e33795e412bffb Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Sun, 15 Aug 2021 00:06:09 -0700 Subject: selftests/bpf: Add ref_ctr_offset selftests Extend attach_probe selftests to specify ref_ctr_offset for uprobe/uretprobe and validate that its value is incremented from zero. Turns out that once uprobe is attached with ref_ctr_offset, uretprobe for the same location/function *has* to use ref_ctr_offset as well, otherwise perf_event_open() fails with -EINVAL. So this test uses ref_ctr_offset for both uprobe and uretprobe, even though for the purpose of test uprobe would be enough. Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20210815070609.987780-17-andrii@kernel.org --- tools/testing/selftests/bpf/trace_helpers.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'tools/testing/selftests/bpf/trace_helpers.c') diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index 381dafce1d8f..e7a19b04d4ea 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -202,3 +202,24 @@ ssize_t get_base_addr(void) fclose(f); return -EINVAL; } + +ssize_t get_rel_offset(uintptr_t addr) +{ + size_t start, end, offset; + char buf[256]; + FILE *f; + + f = fopen("/proc/self/maps", "r"); + if (!f) + return -errno; + + while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &offset) == 4) { + if (addr >= start && addr < end) { + fclose(f); + return (size_t)addr - start + offset; + } + } + + fclose(f); + return -EINVAL; +} -- cgit v1.2.3