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 6BAFE19F485; Tue, 27 Aug 2024 15:21:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724772070; cv=none; b=LLxKgjSMG9fepnr9QMZ4fUL+2YcUVaJ6ZHwlrKsMI75CUAi+jj0Sfa9C8BYe0Uxl9nMjHL5/H3MfjndAa0a0jS83aA2/6j5138Tcf5Xor1FB854dvq50U4jOy1n7tDQ+1Uaqd4Q4lNBhAYb8btQRPy3p9X2bu+hmc3NpfLxnqSw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724772070; c=relaxed/simple; bh=jkz89yD2yBUgsM6n08B/jus5pkGmb79xsdo2Gc9DT3s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Flc0QV3siHWlNYZ1Luu7epFJd51Yo1aX3H6aBYIO64JoaeoP/OAiptU2dz+w5Bwo267aD12laEuiS0h3Z8tOYDMi+l9Xw5efE/k4Wyl+IhlvnHG9M9NViVRGErm42t4arj9aeNjfd7SuYA4x1ciybNHJCFkKpZ6vW2EaMFhRTg4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sjdpAqoL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="sjdpAqoL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E39DDC4FDFA; Tue, 27 Aug 2024 15:21:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1724772070; bh=jkz89yD2yBUgsM6n08B/jus5pkGmb79xsdo2Gc9DT3s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sjdpAqoLmDzLkv3+IBMe4mSOyQ225ELh4rRG7klPv7+TYh3BAO8SU+buY5vuiTgvs 9onb9aRm4T/uRgKXt2hKfHX5nHus3pPSqbRtqMSXBaesjm4J2acDqdk+ofc2VrW9sd IFoTPF3j8kuqwwzn7GT8eREr7dz+NMKrqE8PLe4A= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot , Eric Dumazet , Luiz Augusto von Dentz , Sasha Levin Subject: [PATCH 6.1 072/321] Bluetooth: RFCOMM: Fix not validating setsockopt user input Date: Tue, 27 Aug 2024 16:36:20 +0200 Message-ID: <20240827143840.983455212@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240827143838.192435816@linuxfoundation.org> References: <20240827143838.192435816@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Luiz Augusto von Dentz [ Upstream commit a97de7bff13b1cc825c1b1344eaed8d6c2d3e695 ] syzbot reported rfcomm_sock_setsockopt_old() is copying data without checking user input length. BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline] BUG: KASAN: slab-out-of-bounds in rfcomm_sock_setsockopt_old net/bluetooth/rfcomm/sock.c:632 [inline] BUG: KASAN: slab-out-of-bounds in rfcomm_sock_setsockopt+0x893/0xa70 net/bluetooth/rfcomm/sock.c:673 Read of size 4 at addr ffff8880209a8bc3 by task syz-executor632/5064 Fixes: 9f2c8a03fbb3 ("Bluetooth: Replace RFCOMM link mode with security level") Fixes: bb23c0ab8246 ("Bluetooth: Add support for deferring RFCOMM connection setup") Reported-by: syzbot Signed-off-by: Eric Dumazet Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- net/bluetooth/rfcomm/sock.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c index b54e8a530f55a..29aa07e9db9d7 100644 --- a/net/bluetooth/rfcomm/sock.c +++ b/net/bluetooth/rfcomm/sock.c @@ -629,7 +629,7 @@ static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, switch (optname) { case RFCOMM_LM: - if (copy_from_sockptr(&opt, optval, sizeof(u32))) { + if (bt_copy_from_sockptr(&opt, sizeof(opt), optval, optlen)) { err = -EFAULT; break; } @@ -664,7 +664,6 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, struct sock *sk = sock->sk; struct bt_security sec; int err = 0; - size_t len; u32 opt; BT_DBG("sk %p", sk); @@ -686,11 +685,9 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, sec.level = BT_SECURITY_LOW; - len = min_t(unsigned int, sizeof(sec), optlen); - if (copy_from_sockptr(&sec, optval, len)) { - err = -EFAULT; + err = bt_copy_from_sockptr(&sec, sizeof(sec), optval, optlen); + if (err) break; - } if (sec.level > BT_SECURITY_HIGH) { err = -EINVAL; @@ -706,10 +703,9 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, break; } - if (copy_from_sockptr(&opt, optval, sizeof(u32))) { - err = -EFAULT; + err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, optlen); + if (err) break; - } if (opt) set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); -- 2.43.0