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| author | Martin KaFai Lau | 2018-04-19 00:56:02 +0200 |
|---|---|---|
| committer | Daniel Borkmann | 2018-04-19 21:46:25 +0200 |
| commit | 60197cfb6e11ffc03aa0ed23765b2f7e70b2e2d4 (patch) | |
| tree | ce07ea8aa1bcf4a3c989d8a974a4413a97308c80 /kernel/bpf/syscall.c | |
| parent | bpf: btf: Add BPF_BTF_LOAD command (diff) | |
| download | kernel-qcow2-linux-60197cfb6e11ffc03aa0ed23765b2f7e70b2e2d4.tar.gz kernel-qcow2-linux-60197cfb6e11ffc03aa0ed23765b2f7e70b2e2d4.tar.xz kernel-qcow2-linux-60197cfb6e11ffc03aa0ed23765b2f7e70b2e2d4.zip | |
bpf: btf: Add BPF_OBJ_GET_INFO_BY_FD support to BTF fd
This patch adds BPF_OBJ_GET_INFO_BY_FD support to BTF fd.
The original BTF data, which was used to create the BTF fd during
the earlier BPF_BTF_LOAD call, will be returned.
The userspace is expected to allocate buffer
to info.info and the buffer size is set to info.info_len before
calling BPF_OBJ_GET_INFO_BY_FD.
The original BTF data is copied to the userspace buffer (info.info).
Only upto the user's specified info.info_len will be copied.
The original BTF data size is set to info.info_len. The userspace
needs to check if it is bigger than its allocated buffer size.
If it is, the userspace should realloc with the kernel-returned
info.info_len and call the BPF_OBJ_GET_INFO_BY_FD again.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index cd8ebadc66eb..0a4924a0a8da 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -2017,6 +2017,8 @@ static int bpf_obj_get_info_by_fd(const union bpf_attr *attr, else if (f.file->f_op == &bpf_map_fops) err = bpf_map_get_info_by_fd(f.file->private_data, attr, uattr); + else if (f.file->f_op == &btf_fops) + err = btf_get_info_by_fd(f.file->private_data, attr, uattr); else err = -EINVAL; |