diff options
| author | Lorenz Bauer <lmb@cloudflare.com> | 2018-12-03 11:31:23 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-12-04 08:18:13 -0800 |
| commit | b5a36b1e1b138285ea0df34bf96c759e1e30fafd (patch) | |
| tree | 979d2a28beaa2dcb3bba77964e7e44630694e8eb /include | |
| parent | d59dd69d5576d699d7d3f5da0b4738c3a36d0133 (diff) | |
| download | linux-b5a36b1e1b138285ea0df34bf96c759e1e30fafd.tar.gz | |
bpf: respect size hint to BPF_PROG_TEST_RUN if present
Use data_size_out as a size hint when copying test output to user space.
ENOSPC is returned if the output buffer is too small.
Callers which so far did not set data_size_out are not affected.
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/bpf.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 572eb2d42768..c8e1eeee2c5f 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -374,8 +374,11 @@ union bpf_attr { struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */ __u32 prog_fd; __u32 retval; - __u32 data_size_in; - __u32 data_size_out; + __u32 data_size_in; /* input: len of data_in */ + __u32 data_size_out; /* input/output: len of data_out + * returns ENOSPC if data_out + * is too small. + */ __aligned_u64 data_in; __aligned_u64 data_out; __u32 repeat; |