Commit f7c2d64b authored May 19, 2019 by Chang-Hsien Tsai Committed by Daniel Borkmann May 21, 2019

samples, bpf: fix to change the buffer size for read()



If the trace for read is larger than 4096, the return
value sz will be 4096. This results in off-by-one error
on buf:

    static char buf[4096];
    ssize_t sz;

    sz = read(trace_fd, buf, sizeof(buf));
    if (sz > 0) {
        buf[sz] = 0;
        puts(buf);
    }

Signed-off-by: Chang-Hsien Tsai <luke.tw@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

parent f7355a6c

samples/bpf/bpf_load.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -678,7 +678,7 @@ void read_trace_pipe(void)
		static char buf[4096];
		ssize_t sz;

		sz = read(trace_fd, buf, sizeof(buf));
		sz = read(trace_fd, buf, sizeof(buf) - 1);
		if (sz > 0) {
		buf[sz] = 0;
		puts(buf);