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x86/alternative: Align insn bytes vertically

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For easier inspection which bytes have changed.

For example:

  feat: 7*32+12, old: (__x86_indirect_thunk_r10+0x0/0x20 (ffffffff81c02480) len: 17), repl: (ffffffff897813aa, len: 17)
  ffffffff81c02480:   old_insn: 41 ff e2 90 90 90 90 90 90 90 90 90 90 90 90 90 90
  ffffffff897813aa:   rpl_insn: e8 07 00 00 00 f3 90 0f ae e8 eb f9 4c 89 14 24 c3
  ffffffff81c02480: final_insn: e8 07 00 00 00 f3 90 0f ae e8 eb f9 4c 89 14 24 c3

No functional changes.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210601193713.16190-1-bp@alien8.de
This commit is contained in:
Borislav Petkov 2021-06-01 21:30:56 +02:00
parent c43426334b
commit 7ee0e638a5
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/alternative.c
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@ -273,8 +273,8 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start,
instr, instr, a->instrlen,
replacement, a->replacementlen);
DUMP_BYTES(instr, a->instrlen, "%px: old_insn: ", instr);
DUMP_BYTES(replacement, a->replacementlen, "%px: rpl_insn: ", replacement);
DUMP_BYTES(instr, a->instrlen, "%px: old_insn: ", instr);
DUMP_BYTES(replacement, a->replacementlen, "%px: rpl_insn: ", replacement);
memcpy(insn_buff, replacement, a->replacementlen);
insn_buff_sz = a->replacementlen;