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libbpf: Add BPF_PROG_BIND_MAP syscall and use it on .rodata section

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The patch adds a simple wrapper bpf_prog_bind_map around the syscall.
When the libbpf tries to load a program, it will probe the kernel for
the support of this syscall and unconditionally bind .rodata section
to the program.

Signed-off-by: YiFei Zhu <zhuyifei@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Cc: YiFei Zhu <zhuyifei1999@gmail.com>
Link: https://lore.kernel.org/bpf/20200915234543.3220146-4-sdf@google.com
This commit is contained in:
YiFei Zhu
2020-09-15 16:45:41 -07:00
committed by Andrii Nakryiko
parent f38fccf3cc
commit 3cf3c6cd26
4 changed files with 94 additions and 0 deletions
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16
src/bpf.c
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@@ -872,3 +872,19 @@ int bpf_enable_stats(enum bpf_stats_type type)
return sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr));
}
int bpf_prog_bind_map(int prog_fd, int map_fd,
const struct bpf_prog_bind_opts *opts)
{
union bpf_attr attr;
if (!OPTS_VALID(opts, bpf_prog_bind_opts))
return -EINVAL;
memset(&attr, 0, sizeof(attr));
attr.prog_bind_map.prog_fd = prog_fd;
attr.prog_bind_map.map_fd = map_fd;
attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0);
return sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr));
}