On 3/23/15 12:35 AM, Ingo Molnar wrote:
* Alexei Starovoitov <ast@xxxxxxxxxxxx> wrote:
+void read_trace_pipe(void)
+{
+ int trace_fd;
+
+ trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0);
+ if (trace_fd < 0)
+ return;
+
+ while (1) {
+ static char buf[4096];
+ ssize_t sz;
+
+ sz = read(trace_fd, buf, sizeof(buf));
read() will return -1 on failure ...
+ if (sz) {
... this test passes ...
+ buf[sz] = 0;
... and here we smash the stack?
good point. If it was normal file, for sure it's a bug, but trace_pipe
is a pseudo file and I think read cannot return -1. Regardless, it makes
sense to fix it. Will do. Do you mind I address it as follow up patch?
Or if the rest is ok, can you change the condition to sz>0 while
applying? I can respin the whole thing too, if you like.
Thanks!
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