Re: [PATCH bpf-next 1/8] bpf, x86: generalize and extend bpf_arch_text_poke for direct jumps
From: Andrii Nakryiko <hidden>
Date: 2019-11-20 18:11:44
Also in:
bpf
On Mon, Nov 18, 2019 at 5:38 PM Daniel Borkmann [off-list ref] wrote:
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>
---LGTM. Acked-by: Andrii Nakryiko <redacted>
arch/x86/net/bpf_jit_comp.c | 64 ++++++++++++++++++++++++++----------- include/linux/bpf.h | 6 ++++ 2 files changed, 52 insertions(+), 18 deletions(-)
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