Commit 1c1bc922 authored by Prashanth Nageshappa's avatar Prashanth Nageshappa Committed by Arnaldo Carvalho de Melo

perf probe: Ensure offset provided is not greater than function length without DWARF info too

The 'perf probe' command allows kprobe to be inserted at any offset from
a function start, which results in adding kprobes to unintended
location.  (example: perf probe do_fork+10000 is allowed even though
size of do_fork is ~904).

My previous patch https://lkml.org/lkml/2012/2/24/42 addressed the case
where DWARF info was available for the kernel. This patch fixes the
case where perf probe is used on a kernel without debuginfo available.
Acked-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/4F4C544D.1010909@linux.vnet.ibm.comSigned-off-by: default avatarPrashanth Nageshappa <prashanth@linux.vnet.ibm.com>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent cfbd70c1
......@@ -1867,6 +1867,12 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
tev->point.symbol);
ret = -ENOENT;
goto error;
} else if (tev->point.offset > sym->end - sym->start) {
pr_warning("Offset specified is greater than size of %s\n",
tev->point.symbol);
ret = -ENOENT;
goto error;
}
return 1;
......
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