On Thu, Apr 11, 2024 at 07:05:24PM +0300, Mike Rapoport wrote:
> diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
> index 45a280f2161c..b4d6868df573 100644
> --- a/arch/x86/kernel/alternative.c
> +++ b/arch/x86/kernel/alternative.c
> @@ -504,17 +513,17 @@ void __init_or_module noinline
> apply_alternatives(struct alt_instr *start,
> * patch if feature is *NOT* present.
> */
> if (!boot_cpu_has(a->cpuid) == !(a->flags & ALT_FLAG_NOT)) {
> - optimize_nops_inplace(instr, a->instrlen);
> + optimize_nops_inplace(wr_instr, a->instrlen);
> continue;
> }
>
> - DPRINTK(ALT, "feat: %d*32+%d, old: (%pS (%px) len: %d), repl:
> (%px, len: %d) flags: 0x%x",
> + DPRINTK(ALT, "feat: %d*32+%d, old: (%px (%px) len: %d), repl:
> (%px (%px), len: %d) flags: 0x%x",
> a->cpuid >> 5,
> a->cpuid & 0x1f,
> - instr, instr, a->instrlen,
> - replacement, a->replacementlen, a->flags);
> + instr, wr_instr, a->instrlen,
> + replacement, wr_replacement, a->replacementlen,
> a->flags);
I think this, and
>
> - memcpy(insn_buff, replacement, a->replacementlen);
> + memcpy(insn_buff, wr_replacement, a->replacementlen);
> insn_buff_sz = a->replacementlen;
>
> if (a->flags & ALT_FLAG_DIRECT_CALL) {
> @@ -528,11 +537,11 @@ void __init_or_module noinline
> apply_alternatives(struct alt_instr *start,
>
> apply_relocation(insn_buff, a->instrlen, instr, replacement,
> a->replacementlen);
>
> - DUMP_BYTES(ALT, instr, a->instrlen, "%px: old_insn: ", instr);
> + DUMP_BYTES(ALT, wr_instr, a->instrlen, "%px: old_insn: ",
> instr);
this, want to remain as is.
> DUMP_BYTES(ALT, replacement, a->replacementlen, "%px:
> rpl_insn: ", replacement);
> DUMP_BYTES(ALT, insn_buff, insn_buff_sz, "%px: final_insn: ",
> instr);
>
> - text_poke_early(instr, insn_buff, insn_buff_sz);
> + text_poke_early(wr_instr, insn_buff, insn_buff_sz);
> }
>
> kasan_enable_current();
The rationale being that we then print an address that can be correlated
to the kernel image (provided one either kills kaslr or adjusts for it).
