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objtool: Treat .text.__x86.* as noinstr

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commit 951ddecf435659553ed15a9214e153a3af43a9a1 upstream.

Needed because zen_untrain_ret() will be called from noinstr code.

Also makes sense since the thunks MUST NOT contain instrumentation nor
be poked with dynamic instrumentation.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra 2022-06-14 23:15:47 +02:00 committed by Greg Kroah-Hartman
parent 1f068f9da7
commit 07f5c5e362
1 changed files with 2 additions and 1 deletions
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3
tools/objtool/check.c
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@ -367,7 +367,8 @@ static int decode_instructions(struct objtool_file *file)
sec->text = true;
if (!strcmp(sec->name, ".noinstr.text") ||
!strcmp(sec->name, ".entry.text"))
!strcmp(sec->name, ".entry.text") ||
!strncmp(sec->name, ".text.__x86.", 12))
sec->noinstr = true;
for (offset = 0; offset < sec->sh.sh_size; offset += insn->len) {