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[23.128.96.18]) by mx.google.com with ESMTP id y28si7020301iot.48.2021.08.20.15.47.54; Fri, 20 Aug 2021 15:48:07 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=HupoTaph; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231482AbhHTWpA (ORCPT + 99 others); Fri, 20 Aug 2021 18:45:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229451AbhHTWo7 (ORCPT ); Fri, 20 Aug 2021 18:44:59 -0400 Received: from mail-ej1-x630.google.com (mail-ej1-x630.google.com [IPv6:2a00:1450:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AD62C061575; Fri, 20 Aug 2021 15:44:20 -0700 (PDT) Received: by mail-ej1-x630.google.com with SMTP id ia27so826381ejc.10; Fri, 20 Aug 2021 15:44:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=8xxy+rb/0UXRGn9LhNMBRVQ4TRxH5r6ohNvoniNZoSE=; b=HupoTaphiqd22RZXV507AeEotp4JF/6cRTEQkkboKwfZR7q3e7xGG/5WnrMNY8UtGn m4kABm1tej6qClTYkD98kN2iNiJoYG61fsH4VcWJulJjY0DXsym/040rRinV4viqm6jV JO0tWawkA49OnMt8ItqW8A8co2DNgpFuMfDZIuMLtN3uNq3T0XnUxbZwDGHqHrrN/sxF GoHe1Tfs6Xg5B5VaNQEJePdHC+9t1svKiXS/EOC8ndQhhAtNLvGDE0AalbyxUersGmbT qdxcWfs5Sxxw9vvReGuxlekBJeQK+C5ciL0YKgrpRB0yjUVpHUR5KVL+hYoO6SWoRnd0 isWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=8xxy+rb/0UXRGn9LhNMBRVQ4TRxH5r6ohNvoniNZoSE=; b=fjOBKvBzwxmgkjiRT7+gZRUyMI/Td44pyIvf5XknliieT2YJRamy3fI+MCFmmT+TuC xAVITrjEChC8xhVDQuNAEkbQB3290YLgm97hKk9ACEHXno5m01n5HjakUn3bpEzijD34 c24xBVs7rq5jfs31hyglGpDHAbZa+lpJ/gfgew80z0O7okD/jE5AJ3xlNO4+mr5qqRp3 YU3XJPhlfIGcyRJr5j0TIRhbWOom4Te2pe8TrlXrOgdSDceTZ53cY6wP6kZ7iOI8oLeV TLBbuJln3xOOqkUstt32kUH/DSFd5uQ4cWD8tBkMinwXRwNEyGCBBRKmTQxpXhdmIalS iILA== X-Gm-Message-State: AOAM531EG5dtP/tHKiiXqCSygzQvq8myX71mAabjCV2IhQaDjCKW5uEt WS7ImSjL7t2XzCz9PwomB6rDH6vREq3SGako4Uo= X-Received: by 2002:a17:907:7718:: with SMTP id kw24mr24681485ejc.316.1629499458837; Fri, 20 Aug 2021 15:44:18 -0700 (PDT) MIME-Version: 1.0 References: <77f3e358-c75e-b0bf-ca87-6f8297f5593c@virtuozzo.com> In-Reply-To: From: Christoph Paasch Date: Fri, 20 Aug 2021 15:44:08 -0700 Message-ID: Subject: Re: [PATCH NET v4 3/7] ipv6: use skb_expand_head in ip6_xmit To: Vasily Averin Cc: "David S. Miller" , Hideaki YOSHIFUJI , David Ahern , Jakub Kicinski , Eric Dumazet , netdev , LKML , kernel@openvz.org, Julian Wiedmann Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org (resend without html - thanks gmail web-interface...) On Fri, Aug 20, 2021 at 3:41 PM Christoph Paasch wrote: > > Hello, > > On Fri, Aug 6, 2021 at 1:18 AM Vasily Averin wrote: > > > > Unlike skb_realloc_headroom, new helper skb_expand_head > > does not allocate a new skb if possible. > > > > Additionally this patch replaces commonly used dereferencing with varia= bles. > > > > Signed-off-by: Vasily Averin > > --- > > net/ipv6/ip6_output.c | 27 +++++++++++---------------- > > 1 file changed, 11 insertions(+), 16 deletions(-) > > > > diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c > > index 7d2ec25..f91d13a 100644 > > --- a/net/ipv6/ip6_output.c > > +++ b/net/ipv6/ip6_output.c > > @@ -249,6 +249,8 @@ int ip6_xmit(const struct sock *sk, struct sk_buff = *skb, struct flowi6 *fl6, > > const struct ipv6_pinfo *np =3D inet6_sk(sk); > > struct in6_addr *first_hop =3D &fl6->daddr; > > struct dst_entry *dst =3D skb_dst(skb); > > + struct net_device *dev =3D dst->dev; > > + struct inet6_dev *idev =3D ip6_dst_idev(dst); > > unsigned int head_room; > > struct ipv6hdr *hdr; > > u8 proto =3D fl6->flowi6_proto; > > @@ -256,22 +258,16 @@ int ip6_xmit(const struct sock *sk, struct sk_buf= f *skb, struct flowi6 *fl6, > > int hlimit =3D -1; > > u32 mtu; > > > > - head_room =3D sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->d= ev); > > + head_room =3D sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dev); > > if (opt) > > head_room +=3D opt->opt_nflen + opt->opt_flen; > > > > - if (unlikely(skb_headroom(skb) < head_room)) { > > - struct sk_buff *skb2 =3D skb_realloc_headroom(skb, head= _room); > > - if (!skb2) { > > - IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), > > - IPSTATS_MIB_OUTDISCARDS); > > - kfree_skb(skb); > > + if (unlikely(head_room > skb_headroom(skb))) { > > + skb =3D skb_expand_head(skb, head_room); > > + if (!skb) { > > + IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARD= S); > > > this change introduces a panic on my syzkaller instance: > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 1832 at net/core/skbuff.c:5412 skb_try_coalesce+0x10= 19/0x12c0 net/core/skbuff.c:5412 > Modules linked in: > CPU: 0 PID: 1832 Comm: syz-executor.0 Not tainted 5.14.0-rc4ab492b0cda378= 661ae004e2fd66cfd1be474438d #102 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-= gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 > RIP: 0010:skb_try_coalesce+0x1019/0x12c0 net/core/skbuff.c:5412 > Code: 24 20 bf 01 00 00 00 8b 40 20 44 0f b7 f0 44 89 f6 e8 ab 41 c0 fe 4= 1 83 ee 01 0f 85 01 f3 ff ff e9 42 f6 ff ff e8 07 3c c0 fe <0f> 0b e9 7b f9= ff ff e8 fb 3b c0 fe 48 8b 44 24 40 48 8d 70 ff 4c > RSP: 0018:ffffc90002d97530 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 0000000000000e00 RCX: 0000000000000000 > RDX: ffff88810a27bc00 RSI: ffffffff8276b6c9 RDI: 0000000000000003 > RBP: ffff88810a17f9e0 R08: 0000000000000e00 R09: 0000000000000000 > R10: ffffffff8276b042 R11: 0000000000000000 R12: ffff88810a17f760 > R13: ffff888108fc6ac0 R14: 0000000000001000 R15: ffff88810a17f7d6 > FS: 00007f6be8546700(0000) GS:ffff88811b400000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 000000010a4f0005 CR4: 0000000000170ef0 > Call Trace: > tcp_try_coalesce net/ipv4/tcp_input.c:4642 [inline] > tcp_try_coalesce+0x312/0x870 net/ipv4/tcp_input.c:4621 > tcp_queue_rcv+0x73/0x670 net/ipv4/tcp_input.c:4905 > tcp_data_queue+0x11e5/0x4af0 net/ipv4/tcp_input.c:5016 > tcp_rcv_established+0x83a/0x1d30 net/ipv4/tcp_input.c:5928 > tcp_v6_do_rcv+0x438/0x1380 net/ipv6/tcp_ipv6.c:1517 > sk_backlog_rcv include/net/sock.h:1024 [inline] > __release_sock+0x1ad/0x310 net/core/sock.c:2669 > release_sock+0x54/0x1a0 net/core/sock.c:3193 > tcp_sendmsg+0x36/0x40 net/ipv4/tcp.c:1462 > inet6_sendmsg+0xb5/0x140 net/ipv6/af_inet6.c:646 > sock_sendmsg_nosec net/socket.c:704 [inline] > sock_sendmsg net/socket.c:724 [inline] > ____sys_sendmsg+0x3b5/0x970 net/socket.c:2403 > ___sys_sendmsg+0xff/0x170 net/socket.c:2457 > __sys_sendmmsg+0x192/0x440 net/socket.c:2543 > __do_sys_sendmmsg net/socket.c:2572 [inline] > __se_sys_sendmmsg net/socket.c:2569 [inline] > __x64_sys_sendmmsg+0x98/0x100 net/socket.c:2569 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x7f6be7e55469 > Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f= 7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff= ff 73 01 c3 48 8b 0d ff 49 2b 00 f7 d8 64 89 01 48 > RSP: 002b:00007f6be8545da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 > RAX: ffffffffffffffda RBX: 0000000000000133 RCX: 00007f6be7e55469 > RDX: 0000000000000003 RSI: 00000000200008c0 RDI: 0000000000000003 > RBP: 0000000000000133 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000040044040 R11: 0000000000000246 R12: 000000000069bf8c > R13: 00007ffe013f968f R14: 00007f6be8526000 R15: 0000000000000003 > ---[ end trace 60453d9d261151ca ]--- > > (syzkaller-reproducer at the end of this email) > > AFAICS, this is because pskb_expand_head (called from skb_expand_head) is= not adjusting skb->truesize when skb->sk is set (which I guess is the case= in this particular scenario). I'm not sure what the proper fix would be th= ough... > > > Reproducer: > > # {Threaded:true Collide:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:= 1 Sandbox:none Fault:false FaultCall:-1 FaultNth:0 Leak:false NetInjection:= true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:tr= ue KCSAN:false DevlinkPCI:false USB:false VhciInjection:false Wifi:false IE= EE802154:false Sysctl:true UseTmpDir:true HandleSegv:true Repro:false Trace= :false} > r0 =3D socket$inet6_tcp(0xa, 0x1, 0x0) > bind$inet6(r0, &(0x7f0000000080)=3D{0xa, 0x4e22, 0x0, @loopback}, 0x1c) > sendmmsg$inet6(r0, &(0x7f0000002940)=3D[{{&(0x7f00000000c0)=3D{0xa, 0x4e2= 2, 0x0, @empty}, 0x1c, 0x0}}], 0x36, 0x20000145) > r1 =3D socket$inet6_icmp_raw(0xa, 0x3, 0x3a) > r2 =3D socket$inet_tcp(0x2, 0x1, 0x0) > ioctl$sock_SIOCGIFINDEX(r2, 0x8933, 0x0) > setsockopt$inet6_mreq(r1, 0x29, 0x1b, 0x0, 0x0) > sendmmsg$inet6(r0, &(0x7f00000008c0)=3D[{{0x0, 0x0, &(0x7f0000000240)=3D[= {&(0x7f0000000040)=3D"11c2e854", 0x4}, {0x0}], 0x2}}, {{0x0, 0x0, &(0x7f000= 0000580)=3D[{0x0}, {&(0x7f0000001800)=3D"bcfad31884cb1c6226004dd6ed929a7fa3= 08da79249cdfcf5447732df714b21f9fa725d49453be964002a469aff676404855809cf7d7f= 8fad8ff26c30a9aa692c5ba1c3bf622d795da6efd5425e52f43e8a01e98fec8c4079d0f711b= 7b02666cc4046eed001f62377a14142ee1004708bc6b57ed028e4a0f8af459fa89ec7cd3098= c32cbe69625cd654a3aca8814c9426a817da1b631828f40c0ba2227e8030aabba4eeaeea561= 7df6fbc54918905137032bb60cb86a7ebd4b8b1f8428085bfc5749a3a986dfca6f0e40b2cc3= 2121cdd53ab4815cdf32dca5d1ee64d0e11894d07ad78f5ee5e7701f4803c49d6fdf927a0c1= 03cf5ba9293e232ebd5661fb950f1cacef864673b79c7a180010889f0a8c9d69a97e3f6a88a= 9180fcc61631ffa42332f68a8ae78982b5e232decca2a4259a05e96c7fae309468a364798b7= 343354bdddfe1d81c3393556ced79b92f7c8f9455c1e4deb7cac7d81fdc3d72f201b711a253= c2bf4df9f9bcb0ebe51edd3bb62a9440c0c88dc0b7ed6aaa2fdadd868845865cf6c40ba2122= 2123894323fdd0ae8f8fc896a1c4b77431655d77750578db7e6d01380a7b5f5326cd8dd0091= 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b6e4932e13b791280aed0cca54c3dd77033a8c3836a0306e13dabfdfa96ddcb9fa1de806419= c1eaac65d7b601417b011ce50fd6257ae97f883faacfc2ce7a5fec477793f2bfa24f51d542f= 7d5d4828e7efc455af4f4d4e60f72c6598b72751dc058169e5d13b14b91b5849463f688c10d= 9d4a8f566ee18620a4541dce68411d3746b8b4ef4f891c87cbc536e8e99b828c23732fb1484= fd03e23bc0affde95d7c0c6fc0407d1990b55296c4e32f8c0387b965ee20482d9e666f3caa2= 167218d6a48305b37430835e839b62960fab96ec61e5b49c345fe8c07f7b71ba3b82bef5701= de404461a1aaa01331913dc03e27ed36c7f14f0c82057f477b73e9ee20621a5c70df091a2da= 470db9602aa17f281a15f644a2a85534040dba67d2a6473503453e133098205fb53a3c20fda= fa508a82e9c8d172b2eed24afb1c47890ace2eb48ee9e2bc2488e47bf18e69676b32087e7ab= f3d1b918bd9ac24338d5ae54c0f2c95b0f969f44edac2b552b611ae2b415cfed467ec989e7a= 139a72b0d3c68e20dd307500bbd7f4e079f6c1486bdb31f648c50c1c4b58e6be618ac6257dd= b2558af9f24be2ae415e8edc50197dda4a1178ea4de53bbd66e819173574fecaaa554018953= 8762f472bd562f1d87f64fc39008d4a3f85cd1b3f01508a42a3047976f6f1dcd4c1d9423499= 67dfd633a6e56de55a5e0f2ad68847e7f1e3a08813dc7483db90cf417e7388aab6e4806628e= 6b9ab980a12b9ca6b345845f043d9b31cfbba9a17517cb0d421e2db467e991c2584f625dd18= 84126261e3f455c4f44c15380d43dc7e3e8fc69086395d9535f094432115b3d1b643178aadc= f0919d85c3faddbf631ddd50c322a3e489310de21ec2c3026721f9301a34acfe9d65326f7f7= ad54b6ad6eaa978b739407105d2d4eb869fff3e2de7585a7fed747493bd65537120cac03e3b= 48458ddbdbc5ba3382b6040d4863f4d3fd783276e01a3a9a5f05067d1d101ec424e6fb179cf= 9bcad8f5536b63dd63248ee411ce4b79b70fa7e8a619714646ff2fd557", 0x1000}, {0x0}= , {0x0}], 0x4}}, {{0x0, 0x0, 0x0}}], 0x3, 0x40044040) > setsockopt$inet6_IPV6_HOPOPTS(r0, 0x29, 0x36, &(0x7f0000000640)=3D{0x0, 0= x11, '\x00', [@calipso=3D{0x7, 0x40, {0x0, 0xe, 0xb, 0x101, [0x5, 0x4ebd, 0= x5d, 0x3, 0x80, 0x7, 0x8]}}, @calipso=3D{0x7, 0x10, {0x0, 0x2, 0x6, 0x0, [0= x0]}}, @calipso=3D{0x7, 0x28, {0x2, 0x8, 0x9, 0x6, [0x0, 0x80000001, 0x5d53= , 0x9]}}, @calipso=3D{0x7, 0x8, {0x2, 0x0, 0x3, 0x5}}]}, 0x90) > > > > Christoph >