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objtool: Fix retpoline detection in asm code

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The JMP_NOSPEC macro branches to __x86_retpoline_*() rather than the
__x86_indirect_thunk_*() wrappers used by C code.  Detect jumps to
__x86_retpoline_*() as retpoline dynamic jumps.

Presumably this doesn't trigger a user-visible bug.  I only found it
when testing vmlinux.o validation.

Fixes: 39b735332c ("objtool: Detect jumps to retpoline thunks")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/31f5833e2e4f01e3d755889ac77e3661e906c09f.1611263461.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf
2021-01-21 15:29:18 -06:00
parent 6f567c9300
commit 1f9a1b7494
3 changed files with 14 additions and 2 deletions
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tools/objtool/arch/x86/special.c
+1 -1
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@@ -48,7 +48,7 @@ bool arch_support_alt_relocation(struct special_alt *special_alt,
* replacement group.
*/
return insn->offset == special_alt->new_off &&
(insn->type == INSN_CALL || is_static_jump(insn));
(insn->type == INSN_CALL || is_jump(insn));
}
/*