trace: Use properly sized type for PTRACE_GETEVENTMSG

Without this, on 64-bit systems, ptrace call corrupts memory because
it stores 64bit value to 32bit pid_t variable.

Signed-off-by: Michal Sojka <michal.sojka@cvut.cz>

diff --git a/trace/trace.c b/trace/trace.c
index 27cf10895163b548814eb7daa37e60942efb24ae..665c22ef814a5f98939816d964ba38de60116494 100644 (file)
--- a/trace/trace.c
+++ b/trace/trace.c
@@ -211,7 +211,9 @@ static void tracer_cb(struct uloop_process *c, int ret)
                           (ret >> 8) == (SIGTRAP | (PTRACE_EVENT_CLONE << 8))) {
                        struct tracee *child = calloc(1, sizeof(struct tracee));
 
-                       ptrace(PTRACE_GETEVENTMSG, c->pid, 0, &child->proc.pid);
+                       unsigned long msg;
+                       ptrace(PTRACE_GETEVENTMSG, c->pid, 0, &msg);
+                       child->proc.pid = msg;
                        child->proc.cb = tracer_cb;
                        ptrace(ptrace_restart, child->proc.pid, 0, 0);
                        uloop_process_add(&child->proc);