libbpf-tools: fix ksnoop panic

Running ksnoop with an invalid func will cause panic, testing with glibc 2.35. Error: ``` $ ./ksnoop info xxx Error: [1] 41304 segmentation fault (core dumped) ./ksnoop info xxx ``` Fixed by changing format string to %s. Signed-off-by: Chen Yaqi <[email protected]>
yingtaojuzi · Jul 12, 2022 · 4ce27d4 · 4ce27d4
1 parent ca03af7
commit 4ce27d4
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/libbpf-tools/ksnoop.c b/libbpf-tools/ksnoop.c
@@ -464,7 +464,7 @@ static int get_func_ip_mod(struct func *func)
  f = fopen("/proc/kallsyms", "r");
  if (!f) {
  err = errno;
- p_err("failed to open /proc/kallsyms: %d", strerror(err));
+ p_err("failed to open /proc/kallsyms: %s", strerror(err));
  return err;
  }
 
@@ -563,7 +563,7 @@ static int parse_trace(char *str, struct trace *trace)
  trace->dump = btf_dump__new(trace->btf, NULL, &opts, trace_printf);
  if (!trace->dump) {
  ret = -errno;
- p_err("could not create BTF dump : %n", strerror(-ret));
+ p_err("could not create BTF dump : %s", strerror(-ret));
  return -EINVAL;
  }