diff options
author | Song Liu | 2018-03-14 10:23:22 -0700 |
---|---|---|
committer | Daniel Borkmann | 2018-03-15 01:10:02 +0100 |
commit | 81f77fd0deeb866d65ccc79733df8d2af5217c82 (patch) | |
tree | bebe74af6f86ad63719e1d50442482a51a6beedf /tools/testing/selftests/bpf/urandom_read.c | |
parent | 615755a77b2461ed78dfafb8a6649456201949c7 (diff) |
bpf: add selftest for stackmap with BPF_F_STACK_BUILD_ID
test_stacktrace_build_id() is added. It accesses tracepoint urandom_read
with "dd" and "urandom_read" and gathers stack traces. Then it reads the
stack traces from the stackmap.
urandom_read is a statically link binary that reads from /dev/urandom.
test_stacktrace_build_id() calls readelf to read build ID of urandom_read
and compares it with build ID from the stackmap.
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/testing/selftests/bpf/urandom_read.c')
-rw-r--r-- | tools/testing/selftests/bpf/urandom_read.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/urandom_read.c b/tools/testing/selftests/bpf/urandom_read.c new file mode 100644 index 000000000000..4acfdebf36fa --- /dev/null +++ b/tools/testing/selftests/bpf/urandom_read.c @@ -0,0 +1,22 @@ +#include <stdio.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <stdlib.h> + +#define BUF_SIZE 256 +int main(void) +{ + int fd = open("/dev/urandom", O_RDONLY); + int i; + char buf[BUF_SIZE]; + + if (fd < 0) + return 1; + for (i = 0; i < 4; ++i) + read(fd, buf, BUF_SIZE); + + close(fd); + return 0; +} |