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objtool: Correctly handle retpoline thunk calls 

Just like JMP handling, convert a direct CALL to a retpoline thunk
into a retpoline safe indirect CALL.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/20210326151259.567568238@infradead.org
This commit is contained in:
Peter Zijlstra 2021-03-26 16:12:03 +01:00 committed by Ingo Molnar
parent 119251855f
commit bcb1b6ff39
1 changed files with 12 additions and 0 deletions
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12
tools/objtool/check.c
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@ -1025,6 +1025,18 @@ static int add_call_destinations(struct objtool_file *file)
dest_off);
return -1;
}
} else if (!strncmp(reloc->sym->name, "__x86_indirect_thunk_", 21)) {
/*
* Retpoline calls are really dynamic calls in
* disguise, so convert them accordingly.
*/
insn->type = INSN_CALL_DYNAMIC;
insn->retpoline_safe = true;
remove_insn_ops(insn);
continue;
} else
insn->call_dest = reloc->sym;