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bpf: Add bpf_arch_text_poke() helper

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Add bpf_arch_text_poke() helper that is used by BPF trampoline logic to patch
nops/calls in kernel text into calls into BPF trampoline and to patch
calls/nops inside BPF programs too.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20191114185720.1641606-4-ast@kernel.org
This commit is contained in:
Alexei Starovoitov
2019-11-14 10:57:03 -08:00
committed by Daniel Borkmann
parent 3b2744e665
commit 5964b2000f
3 changed files with 65 additions and 0 deletions
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8
include/linux/bpf.h
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@@ -1157,4 +1157,12 @@ static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
}
#endif /* CONFIG_INET */
enum bpf_text_poke_type {
BPF_MOD_NOP_TO_CALL,
BPF_MOD_CALL_TO_CALL,
BPF_MOD_CALL_TO_NOP,
};
int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
void *addr1, void *addr2);
#endif /* _LINUX_BPF_H */