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bpf: btf: Add BPF_BTF_LOAD command

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This patch adds a BPF_BTF_LOAD command which
1) loads and verifies the BTF (implemented in earlier patches)
2) returns a BTF fd to userspace.  In the next patch, the
   BTF fd can be specified during BPF_MAP_CREATE.

It currently limits to CAP_SYS_ADMIN.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Martin KaFai Lau 2018-04-18 15:56:01 -07:00 • committed by Daniel Borkmann
parent b00b8daec8
commit f56a653c1f
4 changed files with 97 additions and 0 deletions
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4
include/linux/btf.h
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@ -8,7 +8,11 @@
struct btf;
struct btf_type;
union bpf_attr;
void btf_put(struct btf *btf);
int btf_new_fd(const union bpf_attr *attr);
struct btf *btf_get_by_fd(int fd);
/* Figure out the size of a type_id. If type_id is a modifier
* (e.g. const), it will be resolved to find out the type with size.
*