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kprobe-tracer: Check new event/group name 

Check new event/group name is same syntax as a C symbol. In other
words, checking the name is as like as other tracepoint events.

This can prevent user to create an event with useless name (e.g.
foo|bar, foo*bar).

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
LKML-Reference: <20091216222408.14459.68790.stgit@dhcp-100-2-132.bos.redhat.com>
[ v2: minor cleanups ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2009-12-16 17:24:08 -05:00 committed by Ingo Molnar
parent 96c96612e9
commit 6f3cf44047
1 changed files with 25 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
kernel/trace/trace_kprobe.c
View File

@ -282,6 +282,18 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
static int kretprobe_dispatcher(struct kretprobe_instance *ri,
struct pt_regs *regs);
/* Check the name is good for event/group */
static int check_event_name(const char *name)
{
if (!isalpha(*name) && *name != '_')
return 0;
while (*++name != '\0') {
if (!isalpha(*name) && !isdigit(*name) && *name != '_')
return 0;
}
return 1;
}
/*
* Allocate new trace_probe and initialize it (including kprobes).
*/
@ -293,10 +305,11 @@ static struct trace_probe *alloc_trace_probe(const char *group,
int nargs, int is_return)
{
struct trace_probe *tp;
int ret = -ENOMEM;
tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL);
if (!tp)
return ERR_PTR(-ENOMEM);
return ERR_PTR(ret);
if (symbol) {
tp->symbol = kstrdup(symbol, GFP_KERNEL);
@ -312,14 +325,20 @@ static struct trace_probe *alloc_trace_probe(const char *group,
else
tp->rp.kp.pre_handler = kprobe_dispatcher;
if (!event)
if (!event || !check_event_name(event)) {
ret = -EINVAL;
goto error;
}
tp->call.name = kstrdup(event, GFP_KERNEL);
if (!tp->call.name)
goto error;
if (!group)
if (!group || !check_event_name(group)) {
ret = -EINVAL;
goto error;
}
tp->call.system = kstrdup(group, GFP_KERNEL);
if (!tp->call.system)
goto error;
@ -330,7 +349,7 @@ error:
kfree(tp->call.name);
kfree(tp->symbol);
kfree(tp);
return ERR_PTR(-ENOMEM);
return ERR_PTR(ret);
}
static void free_probe_arg(struct probe_arg *arg)
@ -695,10 +714,10 @@ static int create_trace_probe(int argc, char **argv)
if (!event) {
/* Make a new event name */
if (symbol)
snprintf(buf, MAX_EVENT_NAME_LEN, "%c@%s%+ld",
snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld",
is_return ? 'r' : 'p', symbol, offset);
else
snprintf(buf, MAX_EVENT_NAME_LEN, "%c@0x%p",
snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p",
is_return ? 'r' : 'p', addr);
event = buf;
}