Commit 66252445 authored by Sabrina Dubroca's avatar Sabrina Dubroca Committed by Ben Hutchings

tracing/kprobes: Allow to create probe with a module name starting with a digit

commit 9e52b325 upstream.

Always try to parse an address, since kstrtoul() will safely fail when
given a symbol as input. If that fails (which will be the case for a
symbol), try to parse a symbol instead.

This allows creating a probe such as:

    p:probe/vlan_gro_receive 8021q:vlan_gro_receive+0

Which is necessary for this command to work:

    perf probe -m 8021q -a vlan_gro_receive

Link: http://lkml.kernel.org/r/fd72d666f45b114e2c5b9cf7e27b91de1ec966f1.1498122881.git.sd@queasysnail.net

Fixes: 413d37d1 ("tracing: Add kprobe-based event tracer")
Acked-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSabrina Dubroca <sd@queasysnail.net>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
[bwh: Backported to 3.16: preserve the check that an addresses isn't used for
 a kretprobe]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 86c2e149
......@@ -671,24 +671,21 @@ static int create_trace_kprobe(int argc, char **argv)
pr_info("Probe point is not specified.\n");
return -EINVAL;
}
if (isdigit(argv[1][0])) {
/* try to parse an address. if that fails, try to read the
* input as a symbol. */
if (!kstrtoul(argv[1], 0, (unsigned long *)&addr)) {
if (is_return) {
pr_info("Return probe point must be a symbol.\n");
return -EINVAL;
}
/* an address specified */
ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr);
if (ret) {
pr_info("Failed to parse address.\n");
return ret;
}
} else {
/* a symbol specified */
symbol = argv[1];
/* TODO: support .init module functions */
ret = traceprobe_split_symbol_offset(symbol, &offset);
if (ret) {
pr_info("Failed to parse symbol.\n");
pr_info("Failed to parse either an address or a symbol.\n");
return ret;
}
if (offset && is_return) {
......
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