Re: [PATCH v9 tip 6/9] samples: bpf: simple non-portable kprobe filter example
From: Ingo Molnar
Date: Mon Mar 23 2015 - 03:35:19 EST
* 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?
> + puts(buf);
> + }
> + }
Thanks,
Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/