From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 435C91875 for ; Wed, 28 Dec 2022 15:55:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5A3CC433D2; Wed, 28 Dec 2022 15:55:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672242912; bh=Bjp1jxD3DELJl90QpM4hSVLxyl4yYLKc/TpVZaE/S5E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C2DjA08gE/ys3oW+fZXVbTYDO0l+t3lEKVdToIWyupS+s0e34g1ARnDdLGuQisK6s URiAAjVQ+jHdChf3DeQfJB8AyY38gycKCIN0MRwMDzL26MEqVgdkHyHknwsB/y+GpP 6BDJ2o7FgLzJqm4vqQhDAmIulwFGkLZzLgUUDJ/4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+8dd0551dda6020944c5d@syzkaller.appspotmail.com, Stanislav Fomichev , Daniel Borkmann , Yonghong Song , Sasha Levin Subject: [PATCH 5.15 660/731] bpf: Prevent decl_tag from being referenced in func_proto arg Date: Wed, 28 Dec 2022 15:42:47 +0100 Message-Id: <20221228144315.627585532@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144256.536395940@linuxfoundation.org> References: <20221228144256.536395940@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Stanislav Fomichev [ Upstream commit f17472d4599697d701aa239b4c475a506bccfd19 ] Syzkaller managed to hit another decl_tag issue: btf_func_proto_check kernel/bpf/btf.c:4506 [inline] btf_check_all_types kernel/bpf/btf.c:4734 [inline] btf_parse_type_sec+0x1175/0x1980 kernel/bpf/btf.c:4763 btf_parse kernel/bpf/btf.c:5042 [inline] btf_new_fd+0x65a/0xb00 kernel/bpf/btf.c:6709 bpf_btf_load+0x6f/0x90 kernel/bpf/syscall.c:4342 __sys_bpf+0x50a/0x6c0 kernel/bpf/syscall.c:5034 __do_sys_bpf kernel/bpf/syscall.c:5093 [inline] __se_sys_bpf kernel/bpf/syscall.c:5091 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5091 do_syscall_64+0x54/0x70 arch/x86/entry/common.c:48 This seems similar to commit ea68376c8bed ("bpf: prevent decl_tag from being referenced in func_proto") but for the argument. Reported-by: syzbot+8dd0551dda6020944c5d@syzkaller.appspotmail.com Signed-off-by: Stanislav Fomichev Signed-off-by: Daniel Borkmann Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20221123035422.872531-2-sdf@google.com Signed-off-by: Sasha Levin --- kernel/bpf/btf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 7cb13b9f69a6..0c2fa93bd8d2 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -3864,6 +3864,11 @@ static int btf_func_proto_check(struct btf_verifier_env *env, break; } + if (btf_type_is_resolve_source_only(arg_type)) { + btf_verifier_log_type(env, t, "Invalid arg#%u", i + 1); + return -EINVAL; + } + if (args[i].name_off && (!btf_name_offset_valid(btf, args[i].name_off) || !btf_name_valid_identifier(btf, args[i].name_off))) { -- 2.35.1