From patchwork Fri Apr 19 11:08:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 13636243 X-Patchwork-Delegate: kuba@kernel.org 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 B5CCD537FC for ; Fri, 19 Apr 2024 11:08:35 +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=1713524915; cv=none; b=MMkffqbofZ2bE+GjzH7x0iwwlUGHyVtE/7YupIB1JIbZbnO6Et8XqluLk/EKjzhdpraeKIyT7dXCjhJOvUnrkSY3Ln3v/U6GUvrWI9lWyB0fqSbHDt/PI8E8iuOm5sNkWY0Op4K/yIkruvWSd/ZejW/R/6jsoQ4vsuCie6QZh4s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713524915; c=relaxed/simple; bh=ECmHZ5dyszw00G7aA8HRWa0RYg/rq8Td8yJesNoj82s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=PWNN3DeGIb/WPOpBLbdNWdOdrnLtuSsrW1zo8+wIT6GrtdlAIif6QyFX5Miy5lvT4ZBIilE32WvNlf84eOJW0wiwcfnfQ+q4RhDNhq3VzJIte0YI1piPueoCvuvcnwgUYp+ZWLiqOqK+iGD9p7WdxWUoOoQO1d9zOYZGSog/BqY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=r7NwUB95; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="r7NwUB95" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 023B3C072AA; Fri, 19 Apr 2024 11:08:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713524915; bh=ECmHZ5dyszw00G7aA8HRWa0RYg/rq8Td8yJesNoj82s=; h=From:Date:Subject:To:Cc:From; b=r7NwUB95FfJRH3ex8B4ucW2WvztA9w8asutFdHidkPr0DamuFAX/JCvV2w1uaB5P/ nnHeFn1eOUonnI0Elt/SmscdQ1ISwsizhvI9KnWf9nTCnXEb3M5LlkA9OLIGBIN6Ir w3w73kG/oAz/JgF5f7nwHjDupna7J/s5qZeAYDpArmNzxBaslPiLOo3DsZAnr+a2if HLWFVmZuZucZkgVKkEjB+ojzt++ahig+3m8EH9LhaOfLvMSFe0ZMDTujFJYRpI7xNa HzVIL/D+C/wDr3pmRjz5v0XIUctUrkHDKJ7no2rrgwM5pvXuQULkGqM4EJvBp2CE8t /vmb3d0Lby21Q== From: 'Simon Horman' Date: Fri, 19 Apr 2024 12:08:25 +0100 Subject: [PATCH net v4] bonding: Fix out-of-bounds read in bond_option_arp_ip_targets_set() Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240419-bond-oob-v4-1-69dd1a66db20@kernel.org> X-B4-Tracking: v=1; b=H4sIAKhQImYC/x3MQQqAIBBA0avIrBvQsMiuEi1Sp5qNhkYE4t2Tl g8+v0CmxJRhFgUSPZw5hgbdCXDnFg5C9s3Qy15LrQzaGDzGaFHpyUlrhlF6By2/Eu38/qsFAt2 w1voB9b+HyF8AAAA= To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Jay Vosburgh , Andy Gospodarek , Ding Tianhong , Hangbin Liu , Sam Sun , netdev@vger.kernel.org X-Mailer: b4 0.12.3 X-Patchwork-Delegate: kuba@kernel.org From: Sam Sun 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 --- Changes in v4 (Simon): - Correct whitespace mangled patch; posting as requested by Sam Sun - Link to v3: https://lore.kernel.org/r/CAEkJfYOnsLLiCrtgOpq2Upr+_W0dViYVHU8YdjJOi-mxD8H9oQ@mail.gmail.com Changes in v3 (Sam Sun): - According to Hangbin's opinion, change Fixes tag from 4fb0ef585eb2 ("bonding: convert arp_ip_target to use the new option API") to f9de11a16594 ("bonding: add ip checks when store ip target"). - Link to v2: https://lore.kernel.org/r/CAEkJfYMdDQKY1C-wBZLiaJ=dCqfM9r=rykwwf+J-XHsFp7D9Ag@mail.gmail.com/ Changes in v2 (Sam Sun): - According to Jay and Hangbin's opinion, remove target address in netdev_err message since target is not initialized in error path and will not provide useful information. - Link to v1: https://lore.kernel.org/r/CAEkJfYPYF-nNB2oiXfXwjPG0VVB2Bd8Q8kAq+74J=R+4HkngWw@mail.gmail.com/ --- 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 0cacd7027e35..64a06e3399ee 100644 --- a/drivers/net/bonding/bond_options.c +++ b/drivers/net/bonding/bond_options.c @@ -1214,9 +1214,9 @@ 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)) || + !in4_pton(newval->string + 1, -1, (u8 *)&target, -1, NULL)) { + netdev_err(bond->dev, "invalid ARP target I4 specified\n"); return ret; } if (newval->string[0] == '+')