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x86/alternative: Add debug prints to apply_retpolines()
author
Peter Zijlstra
<peterz@infradead.org>
Tue, 26 Oct 2021 12:01:45 +0000
(14:01 +0200)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Sat, 23 Jul 2022 10:53:55 +0000
(12:53 +0200)
commit
d4b5a5c993009ffeb5febe3b701da3faab6adb96
upstream.
Make sure we can see the text changes when booting with
'debug-alternative'.
Example output:
[ ] SMP alternatives: retpoline at: __traceiter_initcall_level+0x1f/0x30 (
ffffffff8100066f
) len: 5 to: __x86_indirect_thunk_rax+0x0/0x20
[ ] SMP alternatives:
ffffffff82603e58
: [2:5) optimized NOPs: ff d0 0f 1f 00
[ ] SMP alternatives:
ffffffff8100066f
: orig: e8 cc 30 00 01
[ ] SMP alternatives:
ffffffff8100066f
: repl: ff d0 0f 1f 00
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Alexei Starovoitov <ast@kernel.org>
Link:
https://lore.kernel.org/r/20211026120310.422273830@infradead.org
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/kernel/alternative.c
patch
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diff --git
a/arch/x86/kernel/alternative.c
b/arch/x86/kernel/alternative.c
index
63f4661
..
b9d0625
100644
(file)
--- a/
arch/x86/kernel/alternative.c
+++ b/
arch/x86/kernel/alternative.c
@@
-492,9
+492,15
@@
void __init_or_module noinline apply_retpolines(s32 *start, s32 *end)
continue;
}
+ DPRINTK("retpoline at: %pS (%px) len: %d to: %pS",
+ addr, addr, insn.length,
+ addr + insn.length + insn.immediate.value);
+
len = patch_retpoline(addr, &insn, bytes);
if (len == insn.length) {
optimize_nops(bytes, len);
+ DUMP_BYTES(((u8*)addr), len, "%px: orig: ", addr);
+ DUMP_BYTES(((u8*)bytes), len, "%px: repl: ", addr);
text_poke_early(addr, bytes, len);
}
}