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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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8
src/bpf.h
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@@ -243,6 +243,14 @@ LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf,
enum bpf_stats_type; /* defined in up-to-date linux/bpf.h */
LIBBPF_API int bpf_enable_stats(enum bpf_stats_type type);
struct bpf_prog_bind_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 flags;
};
#define bpf_prog_bind_opts__last_field flags
LIBBPF_API int bpf_prog_bind_map(int prog_fd, int map_fd,
const struct bpf_prog_bind_opts *opts);
#ifdef __cplusplus
} /* extern "C" */
#endif