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objtool: Fix retpoline detection in asm code

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[ Upstream commit 1f9a1b74942485a0a29e7c4a9a9f2fe8aea17766 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Josh Poimboeuf
2021-01-21 15:29:18 -06:00
committed by Greg Kroah-Hartman
parent 9e06f36658
commit 7631376b2d
3 changed files with 14 additions and 2 deletions
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11
tools/objtool/check.h
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@@ -54,6 +54,17 @@ static inline bool is_static_jump(struct instruction *insn)
insn->type == INSN_JUMP_UNCONDITIONAL;
}
static inline bool is_dynamic_jump(struct instruction *insn)
{
return insn->type == INSN_JUMP_DYNAMIC ||
insn->type == INSN_JUMP_DYNAMIC_CONDITIONAL;
}
static inline bool is_jump(struct instruction *insn)
{
return is_static_jump(insn) || is_dynamic_jump(insn);
}
struct instruction *find_insn(struct objtool_file *file,
struct section *sec, unsigned long offset);