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objtool: skip non-text sections when adding return-thunk sites

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The .discard.text section is added in order to reserve BRK, with a
temporary function just so it can give it a size. This adds a relocation to
the return thunk, which objtool will add to the .return_sites section.
Linking will then fail as there are references to the .discard.text
section.

Do not add instructions from non-text sections to the list of return thunk
calls, avoiding the reference to .discard.text.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thadeu Lima de Souza Cascardo 2022-07-01 09:00:45 -03:00 committed by Greg Kroah-Hartman
parent 8bdb25f7ae
commit 446eb6f089
1 changed files with 3 additions and 1 deletions
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4
tools/objtool/check.c
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@ -1090,7 +1090,9 @@ static void add_return_call(struct objtool_file *file, struct instruction *insn)
insn->type = INSN_RETURN;
insn->retpoline_safe = true;
list_add_tail(&insn->call_node, &file->return_thunk_list);
/* Skip the non-text sections, specially .discard ones */
if (insn->sec->text)
list_add_tail(&insn->call_node, &file->return_thunk_list);
}
/*