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From:   Christoph Paasch <christoph.paasch@gmail.com>
Date:   Fri, 20 Aug 2021 15:44:08 -0700
Message-ID: <CALMXkpa4RqwssO2QNKMjk=f8pGWDMtj4gpQbAYWbGDRfN4J6DQ@mail.gmail.com>
Subject: Re: [PATCH NET v4 3/7] ipv6: use skb_expand_head in ip6_xmit
To:     Vasily Averin <vvs@virtuozzo.com>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
        David Ahern <dsahern@kernel.org>,
        Jakub Kicinski <kuba@kernel.org>,
        Eric Dumazet <eric.dumazet@gmail.com>,
        netdev <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>, kernel@openvz.org,
        Julian Wiedmann <jwi@linux.ibm.com>
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On Fri, Aug 20, 2021 at 3:41 PM Christoph Paasch
<christoph.paasch@gmail.com> wrote:
>
> Hello,
>
> On Fri, Aug 6, 2021 at 1:18 AM Vasily Averin <vvs@virtuozzo.com> 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 <vvs@virtuozzo.com>
> > ---
> >  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=
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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
>