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| author | Daniel T. Lee <danieltimlee@gmail.com> | 2019-04-04 01:17:55 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-04-04 17:43:46 +0300 |
| commit | 0979ff7992fb6f4eb837995b12f4071dcafebd2d (patch) | |
| tree | 82e7bbd768ae68415384cf0d39384857157e29e2 /tools/testing/selftests/bpf/trace_helpers.c | |
| parent | cc441a69486bbeda9b99438246720c8214781255 (diff) | |
| download | linux-0979ff7992fb6f4eb837995b12f4071dcafebd2d.tar.xz | |
selftests/bpf: ksym_search won't check symbols exists
Currently, ksym_search located at trace_helpers won't check symbols are
existing or not.
In ksym_search, when symbol is not found, it will return &syms[0](_stext).
But when the kernel symbols are not loaded, it will return NULL, which is
not a desired action.
This commit will add verification logic whether symbols are loaded prior
to the symbol search.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/testing/selftests/bpf/trace_helpers.c')
| -rw-r--r-- | tools/testing/selftests/bpf/trace_helpers.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index 4cdb63bf0521..9a9fc6c9b70b 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -52,6 +52,10 @@ struct ksym *ksym_search(long key) int start = 0, end = sym_cnt; int result; + /* kallsyms not loaded. return NULL */ + if (sym_cnt <= 0) + return NULL; + while (start < end) { size_t mid = start + (end - start) / 2; |