bpf, x86: Generalize and extend bpf_arch_text_poke for direct jumps

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Add BPF_MOD_{NOP_TO_JUMP,JUMP_TO_JUMP,JUMP_TO_NOP} patching for x86
JIT in order to be able to patch direct jumps or nop them out. We need
this facility in order to patch tail call jumps and in later work also
BPF static keys.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/aa4784196a8e5e985af4b30a4fe5336bce6e9643.1574452833.git.daniel@iogearbox.net

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Daniel Borkmann 2019-11-22 21:07:54 +01:00 • committed by Alexei Starovoitov

parent c4781e37c6

commit 4b3da77b72

2 changed files with 52 additions and 18 deletions

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64

arch/x86/net/bpf_jit_comp.c

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6

include/linux/bpf.h

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