From: Alexei Starovoitov <ast@xxxxxxxxxx> commit 580205dd4fe800b1e95be8b6df9e2991f975a8ad upstream. Fix two issues in test_attach_probe: 1. it was not able to parse /proc/self/maps beyond the first line, since %s means parse string until white space. 2. offset has to be accounted for otherwise uprobed address is incorrect. Fixes: 1e8611bbdfc9 ("selftests/bpf: add kprobe/uprobe selftests") Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx> Acked-by: Yonghong Song <yhs@xxxxxx> Acked-by: Andrii Nakryiko <andriin@xxxxxx> Link: https://lore.kernel.org/bpf/20191219020442.1922617-1-ast@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/bpf/prog_tests/attach_probe.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c @@ -20,7 +20,7 @@ extern char NAME##_data[]; \ extern int NAME##_size; ssize_t get_base_addr() { - size_t start; + size_t start, offset; char buf[256]; FILE *f; @@ -28,10 +28,11 @@ ssize_t get_base_addr() { if (!f) return -errno; - while (fscanf(f, "%zx-%*x %s %*s\n", &start, buf) == 2) { + while (fscanf(f, "%zx-%*x %s %zx %*[^\n]\n", + &start, buf, &offset) == 3) { if (strcmp(buf, "r-xp") == 0) { fclose(f); - return start; + return start - offset; } }