From 1c1bc9223387dacc48eb2b61b0baabe7e9cf47f6 Mon Sep 17 00:00:00 2001 From: Prashanth Nageshappa Date: Tue, 28 Feb 2012 09:43:01 +0530 Subject: 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: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli Cc: Jason Baron Cc: Masami Hiramatsu Cc: Srikar Dronamraju Cc: Steven Rostedt Cc: Andrew Morton Link: http://lkml.kernel.org/r/4F4C544D.1010909@linux.vnet.ibm.com Signed-off-by: Prashanth Nageshappa Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-event.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'tools/perf') diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 29cb65459811..e33554a562b3 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -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; -- cgit v1.2.3