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    Subject[PATCH 5.4 069/168] sched: etf: do not assume all sockets are full blown
    Date
    From: Eric Dumazet <edumazet@google.com>

    [ Upstream commit a1211bf9a7774706722ba3b18c6157d980319f79 ]

    skb->sk does not always point to a full blown socket,
    we need to use sk_fullsock() before accessing fields which
    only make sense on full socket.

    BUG: KASAN: use-after-free in report_sock_error+0x286/0x300 net/sched/sch_etf.c:141
    Read of size 1 at addr ffff88805eb9b245 by task syz-executor.5/9630

    CPU: 1 PID: 9630 Comm: syz-executor.5 Not tainted 5.7.0-rc2-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    Call Trace:
    <IRQ>
    __dump_stack lib/dump_stack.c:77 [inline]
    dump_stack+0x188/0x20d lib/dump_stack.c:118
    print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382
    __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511
    kasan_report+0x33/0x50 mm/kasan/common.c:625
    report_sock_error+0x286/0x300 net/sched/sch_etf.c:141
    etf_enqueue_timesortedlist+0x389/0x740 net/sched/sch_etf.c:170
    __dev_xmit_skb net/core/dev.c:3710 [inline]
    __dev_queue_xmit+0x154a/0x30a0 net/core/dev.c:4021
    neigh_hh_output include/net/neighbour.h:499 [inline]
    neigh_output include/net/neighbour.h:508 [inline]
    ip6_finish_output2+0xfb5/0x25b0 net/ipv6/ip6_output.c:117
    __ip6_finish_output+0x442/0xab0 net/ipv6/ip6_output.c:143
    ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153
    NF_HOOK_COND include/linux/netfilter.h:296 [inline]
    ip6_output+0x239/0x810 net/ipv6/ip6_output.c:176
    dst_output include/net/dst.h:435 [inline]
    NF_HOOK include/linux/netfilter.h:307 [inline]
    NF_HOOK include/linux/netfilter.h:301 [inline]
    ip6_xmit+0xe1a/0x2090 net/ipv6/ip6_output.c:280
    tcp_v6_send_synack+0x4e7/0x960 net/ipv6/tcp_ipv6.c:521
    tcp_rtx_synack+0x10d/0x1a0 net/ipv4/tcp_output.c:3916
    inet_rtx_syn_ack net/ipv4/inet_connection_sock.c:669 [inline]
    reqsk_timer_handler+0x4c2/0xb40 net/ipv4/inet_connection_sock.c:763
    call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1405
    expire_timers kernel/time/timer.c:1450 [inline]
    __run_timers kernel/time/timer.c:1774 [inline]
    __run_timers kernel/time/timer.c:1741 [inline]
    run_timer_softirq+0x623/0x1600 kernel/time/timer.c:1787
    __do_softirq+0x26c/0x9f7 kernel/softirq.c:292
    invoke_softirq kernel/softirq.c:373 [inline]
    irq_exit+0x192/0x1d0 kernel/softirq.c:413
    exiting_irq arch/x86/include/asm/apic.h:546 [inline]
    smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1140
    apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
    </IRQ>
    RIP: 0010:des_encrypt+0x157/0x9c0 lib/crypto/des.c:792
    Code: 85 22 06 00 00 41 31 dc 41 8b 4d 04 44 89 e2 41 83 e4 3f 4a 8d 3c a5 60 72 72 88 81 e2 3f 3f 3f 3f 48 89 f8 48 c1 e8 03 31 d9 <0f> b6 34 28 48 89 f8 c1 c9 04 83 e0 07 83 c0 03 40 38 f0 7c 09 40
    RSP: 0018:ffffc90003b5f6c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
    RAX: 1ffffffff10e4e55 RBX: 00000000d2f846d0 RCX: 00000000d2f846d0
    RDX: 0000000012380612 RSI: ffffffff839863ca RDI: ffffffff887272a8
    RBP: dffffc0000000000 R08: ffff888091d0a380 R09: 0000000000800081
    R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000012
    R13: ffff8880a8ae8078 R14: 00000000c545c93e R15: 0000000000000006
    cipher_crypt_one crypto/cipher.c:75 [inline]
    crypto_cipher_encrypt_one+0x124/0x210 crypto/cipher.c:82
    crypto_cbcmac_digest_update+0x1b5/0x250 crypto/ccm.c:830
    crypto_shash_update+0xc4/0x120 crypto/shash.c:119
    shash_ahash_update+0xa3/0x110 crypto/shash.c:246
    crypto_ahash_update include/crypto/hash.h:547 [inline]
    hash_sendmsg+0x518/0xad0 crypto/algif_hash.c:102
    sock_sendmsg_nosec net/socket.c:652 [inline]
    sock_sendmsg+0xcf/0x120 net/socket.c:672
    ____sys_sendmsg+0x308/0x7e0 net/socket.c:2362
    ___sys_sendmsg+0x100/0x170 net/socket.c:2416
    __sys_sendmmsg+0x195/0x480 net/socket.c:2506
    __do_sys_sendmmsg net/socket.c:2535 [inline]
    __se_sys_sendmmsg net/socket.c:2532 [inline]
    __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2532
    do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
    entry_SYSCALL_64_after_hwframe+0x49/0xb3
    RIP: 0033:0x45c829
    Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
    RSP: 002b:00007f6d9528ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
    RAX: ffffffffffffffda RBX: 00000000004fc080 RCX: 000000000045c829
    RDX: 0000000000000001 RSI: 0000000020002640 RDI: 0000000000000004
    RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
    R13: 00000000000008d7 R14: 00000000004cb7aa R15: 00007f6d9528f6d4

    Fixes: 4b15c7075352 ("net/sched: Make etf report drops on error_queue")
    Fixes: 25db26a91364 ("net/sched: Introduce the ETF Qdisc")
    Signed-off-by: Eric Dumazet <edumazet@google.com>
    Reported-by: syzbot <syzkaller@googlegroups.com>
    Cc: Vinicius Costa Gomes <vinicius.gomes@intel.com>
    Reviewed-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/sched/sch_etf.c | 7 ++++---
    1 file changed, 4 insertions(+), 3 deletions(-)

    --- a/net/sched/sch_etf.c
    +++ b/net/sched/sch_etf.c
    @@ -82,7 +82,7 @@ static bool is_packet_valid(struct Qdisc
    if (q->skip_sock_check)
    goto skip;

    - if (!sk)
    + if (!sk || !sk_fullsock(sk))
    return false;

    if (!sock_flag(sk, SOCK_TXTIME))
    @@ -137,8 +137,9 @@ static void report_sock_error(struct sk_
    struct sock_exterr_skb *serr;
    struct sk_buff *clone;
    ktime_t txtime = skb->tstamp;
    + struct sock *sk = skb->sk;

    - if (!skb->sk || !(skb->sk->sk_txtime_report_errors))
    + if (!sk || !sk_fullsock(sk) || !(sk->sk_txtime_report_errors))
    return;

    clone = skb_clone(skb, GFP_ATOMIC);
    @@ -154,7 +155,7 @@ static void report_sock_error(struct sk_
    serr->ee.ee_data = (txtime >> 32); /* high part of tstamp */
    serr->ee.ee_info = txtime; /* low part of tstamp */

    - if (sock_queue_err_skb(skb->sk, clone))
    + if (sock_queue_err_skb(sk, clone))
    kfree_skb(clone);
    }


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