diff options
author | Josef Bacik <jbacik@fb.com> | 2017-11-07 15:28:43 -0500 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2017-11-11 12:18:06 +0900 |
commit | eafb3401faf243f7dca0e23325242cb8c2269ee9 (patch) | |
tree | d7dffdccd2bb46bd11e8fffef50c3690b244c64c /samples/bpf/tracex7_kern.c | |
parent | dd0bb688eaa241b5655d396d45366cba9225aed9 (diff) |
samples/bpf: add a test for bpf_override_return
This adds a basic test for bpf_override_return to verify it works. We
override the main function for mounting a btrfs fs so it'll return
-ENOMEM and then make sure that trying to mount a btrfs fs will fail.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/tracex7_kern.c')
-rw-r--r-- | samples/bpf/tracex7_kern.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/samples/bpf/tracex7_kern.c b/samples/bpf/tracex7_kern.c new file mode 100644 index 000000000000..1ab308a43e0f --- /dev/null +++ b/samples/bpf/tracex7_kern.c @@ -0,0 +1,16 @@ +#include <uapi/linux/ptrace.h> +#include <uapi/linux/bpf.h> +#include <linux/version.h> +#include "bpf_helpers.h" + +SEC("kprobe/open_ctree") +int bpf_prog1(struct pt_regs *ctx) +{ + unsigned long rc = -12; + + bpf_override_return(ctx, rc); + return 0; +} + +char _license[] SEC("license") = "GPL"; +u32 _version SEC("version") = LINUX_VERSION_CODE; |