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skip kprobe functions outside normal text section #1647

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merged 1 commit into from
Mar 23, 2018
Merged

skip kprobe functions outside normal text section #1647

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13 changes: 11 additions & 2 deletions src/python/bcc/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -481,9 +481,18 @@ def get_kprobe_functions(event_re):
with open("%s/../kprobes/blacklist" % TRACEFS, "rb") as blacklist_f:
blacklist = set([line.rstrip().split()[1] for line in blacklist_f])
fns = []

found_stext = False
with open("/proc/kallsyms", "rb") as avail_file:
for line in avail_file:
(_, t, fn) = line.rstrip().split()[:3]
if found_stext is False:
if fn == b'_stext':
found_stext = True
continue

if fn == b'_etext':
break
if (t.lower() in [b't', b'w']) and re.match(event_re, fn) \
and fn not in blacklist:
fns.append(fn)
Expand Down Expand Up @@ -558,7 +567,7 @@ def attach_kretprobe(self, event=b"", fn_name=b"", event_re=b""):
ev_name = b"r_" + event.replace(b"+", b"_").replace(b".", b"_")
fd = lib.bpf_attach_kprobe(fn.fd, 1, ev_name, event)
if fd < 0:
raise Exception("Failed to attach BPF to kprobe")
raise Exception("Failed to attach BPF to kretprobe")
self._add_kprobe_fd(ev_name, fd)
return self

Expand Down Expand Up @@ -877,7 +886,7 @@ def attach_uretprobe(self, name=b"", sym=b"", sym_re=b"", addr=None,
ev_name = self._get_uprobe_evname(b"r", path, addr, pid)
fd = lib.bpf_attach_uprobe(fn.fd, 1, ev_name, path, addr, pid)
if fd < 0:
raise Exception("Failed to attach BPF to uprobe")
raise Exception("Failed to attach BPF to uretprobe")
self._add_uprobe_fd(ev_name, fd)
return self

Expand Down