提交 f8f54929 编写于 作者: D Daniel T. Lee 提交者: Greg Kroah-Hartman

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: NDaniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
上级 ef8e5a78
...@@ -51,6 +51,10 @@ struct ksym *ksym_search(long key) ...@@ -51,6 +51,10 @@ struct ksym *ksym_search(long key)
int start = 0, end = sym_cnt; int start = 0, end = sym_cnt;
int result; int result;
/* kallsyms not loaded. return NULL */
if (sym_cnt <= 0)
return NULL;
while (start < end) { while (start < end) {
size_t mid = start + (end - start) / 2; size_t mid = start + (end - start) / 2;
......
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