From: Daniel Borkmann <dan...@iogearbox.net>
Date: Tue, 1 Jan 2019 21:49:19 +0100
> diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
> index a34312a..4e6f29a 100644
> --- a/kernel/bpf/core.c
> +++ b/kernel/bpf/core.c
> @@ -858,6 +858,26 @@ static int bpf_jit_blind_insn(const struct bpf_insn
> *from,
> BUILD_BUG_ON(BPF_REG_AX + 1 != MAX_BPF_JIT_REG);
> BUILD_BUG_ON(MAX_BPF_REG + 1 != MAX_BPF_JIT_REG);
>
> + /* Constraints on AX register:
> + *
> + * AX register is inaccessible from user space. It is mapped in
> + * all JITs, and used here for constant blinding rewrites. It is
> + * typically "stateless" meaning its contents are only valid within
> + * the executed instruction, but not across several instructions.
> + * There are a few exceptions however which are further detailled
^^^^^^^^^
Typo, should be "detailed".
