From nobody Fri Oct 17 10:17:08 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EB95BC4332F for ; Wed, 19 Oct 2022 08:57:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231983AbiJSI5g (ORCPT ); Wed, 19 Oct 2022 04:57:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60606 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231968AbiJSI4m (ORCPT ); Wed, 19 Oct 2022 04:56:42 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B947CE85; Wed, 19 Oct 2022 01:53:00 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 442906187C; Wed, 19 Oct 2022 08:51:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 52D8BC433C1; Wed, 19 Oct 2022 08:51:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666169511; bh=G3B/VF+S16OMDOiqigw8aZvlTpB0ciFKkf7elAxmEL0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UmHHcEOZZLP1W7dByqKbK4yIZh7tRb8IHVlN6d5+8W+REWJ80L3OVdRAu61Kjph+D ga3QvgKlp5nAKuP7MWnYrpup4tUQP0LCMe4+jLhqszkSleb50NfNAnrCsJMIeKiDml ZDgZXXMz/sd6N/oKbb5CRuMC/zN1bfdsOovWJADg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stanislav Fomichev , Lorenz Bauer , Alexei Starovoitov , Sasha Levin Subject: [PATCH 6.0 271/862] bpf: btf: fix truncated last_member_type_id in btf_struct_resolve Date: Wed, 19 Oct 2022 10:25:58 +0200 Message-Id: <20221019083302.004100561@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221019083249.951566199@linuxfoundation.org> References: <20221019083249.951566199@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Lorenz Bauer [ Upstream commit a37a32583e282d8d815e22add29bc1e91e19951a ] When trying to finish resolving a struct member, btf_struct_resolve saves the member type id in a u16 temporary variable. This truncates the 32 bit type id value if it exceeds UINT16_MAX. As a result, structs that have members with type ids > UINT16_MAX and which need resolution will fail with a message like this: [67414] STRUCT ff_device size=3D120 vlen=3D12 effect_owners type_id=3D67434 bits_offset=3D960 Member exceeds stru= ct_size Fix this by changing the type of last_member_type_id to u32. Fixes: a0791f0df7d2 ("bpf: fix BTF limits") Reviewed-by: Stanislav Fomichev Signed-off-by: Lorenz Bauer Link: https://lore.kernel.org/r/20220910110120.339242-1-oss@lmb.io Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin --- kernel/bpf/btf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 7e64447659f3..36fd4b509294 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -3128,7 +3128,7 @@ static int btf_struct_resolve(struct btf_verifier_env= *env, if (v->next_member) { const struct btf_type *last_member_type; const struct btf_member *last_member; - u16 last_member_type_id; + u32 last_member_type_id; =20 last_member =3D btf_type_member(v->t) + v->next_member - 1; last_member_type_id =3D last_member->type; --=20 2.35.1