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 E306C158875; Tue, 9 Jul 2024 11:15:57 +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=1720523758; cv=none; b=FOsHU8BSqaLOfJrkkqzVG45rxOsfjx1xiFo0Yix++1iZi6zqnsjRZepfTl+P0lyP0kd18tE3ETpPps+T7QgkTWXJyR3GzHirUvMTwD2oj3bpKhCBYm5XgyTn+SS/3HiSKZKN6U2FlsV8EqyDbTnCLC49+uVSB2+puQe8zEF18VU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720523758; c=relaxed/simple; bh=zYtDnhY2OzeEAceTkKGXJi39q1h6XpYDrzOicOkzF1o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=H5V1AmM6m/0BoHbvjwND1amrc+JIgZEKkM8E8DlvPODYiuYh26Mb2ldJo0OYscVrnMNdqPnMWK1MYnmSTeE5gdNGWhQQxbxGXb4fbCdp8ELzduqIixjQyb8FRfyshT8Xm7e7hs9eY3wxBHlJUie/hSoLOnqpfFCxDeVO3EHyJgM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rWgt8SCJ; 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="rWgt8SCJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1B5FFC3277B; Tue, 9 Jul 2024 11:15:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720523757; bh=zYtDnhY2OzeEAceTkKGXJi39q1h6XpYDrzOicOkzF1o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rWgt8SCJzt4Q0OPOptE8yJYHCwmzFbvDr7NP3nAzRTVjiv3r16EjsmFrdlSmQKHZz dsKNjWHOG2fxvSAiWG5Mo/sHQe0q++3kml43k9mMN+wDJsB8rmB/dW9rWnLD1AAG8G 9SSXRTzPHtUT0k/sGyxmYsf171EOegpOgpdqnkKs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yue Sun , Simon Horman , Jay Vosburgh , Hangbin Liu , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.6 081/139] bonding: Fix out-of-bounds read in bond_option_arp_ip_targets_set() Date: Tue, 9 Jul 2024 13:09:41 +0200 Message-ID: <20240709110701.306878512@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240709110658.146853929@linuxfoundation.org> References: <20240709110658.146853929@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sam Sun [ Upstream commit e271ff53807e8f2c628758290f0e499dbe51cb3d ] In function bond_option_arp_ip_targets_set(), if newval->string is an empty string, newval->string+1 will point to the byte after the string, causing an out-of-bound read. BUG: KASAN: slab-out-of-bounds in strlen+0x7d/0xa0 lib/string.c:418 Read of size 1 at addr ffff8881119c4781 by task syz-executor665/8107 CPU: 1 PID: 8107 Comm: syz-executor665 Not tainted 6.7.0-rc7 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc1/0x5e0 mm/kasan/report.c:475 kasan_report+0xbe/0xf0 mm/kasan/report.c:588 strlen+0x7d/0xa0 lib/string.c:418 __fortify_strlen include/linux/fortify-string.h:210 [inline] in4_pton+0xa3/0x3f0 net/core/utils.c:130 bond_option_arp_ip_targets_set+0xc2/0x910 drivers/net/bonding/bond_options.c:1201 __bond_opt_set+0x2a4/0x1030 drivers/net/bonding/bond_options.c:767 __bond_opt_set_notify+0x48/0x150 drivers/net/bonding/bond_options.c:792 bond_opt_tryset_rtnl+0xda/0x160 drivers/net/bonding/bond_options.c:817 bonding_sysfs_store_option+0xa1/0x120 drivers/net/bonding/bond_sysfs.c:156 dev_attr_store+0x54/0x80 drivers/base/core.c:2366 sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x96a/0xd80 fs/read_write.c:584 ksys_write+0x122/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b ---[ end trace ]--- Fix it by adding a check of string length before using it. Fixes: f9de11a16594 ("bonding: add ip checks when store ip target") Signed-off-by: Yue Sun Signed-off-by: Simon Horman Acked-by: Jay Vosburgh Reviewed-by: Hangbin Liu Link: https://patch.msgid.link/20240702-bond-oob-v6-1-2dfdba195c19@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/bonding/bond_options.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c index f3f27f0bd2a6c..00a662f8edd6b 100644 --- a/drivers/net/bonding/bond_options.c +++ b/drivers/net/bonding/bond_options.c @@ -1198,9 +1198,9 @@ static int bond_option_arp_ip_targets_set(struct bonding *bond, __be32 target; if (newval->string) { - if (!in4_pton(newval->string+1, -1, (u8 *)&target, -1, NULL)) { - netdev_err(bond->dev, "invalid ARP target %pI4 specified\n", - &target); + if (strlen(newval->string) < 1 || + !in4_pton(newval->string + 1, -1, (u8 *)&target, -1, NULL)) { + netdev_err(bond->dev, "invalid ARP target specified\n"); return ret; } if (newval->string[0] == '+') -- 2.43.0