diff options
Diffstat (limited to 'kernel/trace/trace_kprobe.c')
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 7ecab06..375f81a 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -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; } |
