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| author | Daniel T. Lee <danieltimlee@gmail.com> | 2019-04-04 07:17:55 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 06:46:25 -0700 |
| commit | f8f54929bd239bd875c1004c997b1ffc450a45f4 (patch) | |
| tree | 1a59f31132b39c0a717abe1c030767719e8392be /tools | |
| parent | ef8e5a78406d103ac546a7a50cb02f05fec7987f (diff) | |
| download | linux-stable-f8f54929bd239bd875c1004c997b1ffc450a45f4.tar.gz linux-stable-f8f54929bd239bd875c1004c997b1ffc450a45f4.tar.bz2 linux-stable-f8f54929bd239bd875c1004c997b1ffc450a45f4.zip | |
selftests/bpf: ksym_search won't check symbols exists
[ Upstream commit 0979ff7992fb6f4eb837995b12f4071dcafebd2d ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools')
| -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 cabe2a3a3b30..cf156b353679 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -51,6 +51,10 @@ 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; |