Re: KASAN: slab-out-of-bounds Read in sctp_inq_pop
On Tue, Aug 27, 2019 at 1:15 AM syzbot wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit:9733a7c6 Add linux-next specific files for 20190823 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=143ec11e60 > kernel config: https://syzkaller.appspot.com/x/.config?x=f6c78a1438582bd1 > dashboard link: https://syzkaller.appspot.com/bug?extid=3ca06c5cb35ee3fc1f89 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+3ca06c5cb35ee3fc1...@syzkaller.appspotmail.com > > == > BUG: KASAN: slab-out-of-bounds in sctp_inq_pop+0xafd/0xd80 > net/sctp/inqueue.c:201 > Read of size 2 at addr 8880a4e37222 by task syz-executor.3/32407 > > CPU: 1 PID: 32407 Comm: syz-executor.3 Not tainted 5.3.0-rc5-next-20190823 > #72 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x172/0x1f0 lib/dump_stack.c:113 > print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 > __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 > kasan_report+0x12/0x17 mm/kasan/common.c:610 > __asan_report_load2_noabort+0x14/0x20 mm/kasan/generic_report.c:130 > sctp_inq_pop+0xafd/0xd80 net/sctp/inqueue.c:201 > sctp_endpoint_bh_rcv+0x184/0x8d0 net/sctp/endpointola.c:335 > sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80 > sctp_rcv+0x2807/0x3590 net/sctp/input.c:256 > sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1049 > ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397 > ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438 > NF_HOOK include/linux/netfilter.h:305 [inline] > NF_HOOK include/linux/netfilter.h:299 [inline] > ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447 > dst_input include/net/dst.h:442 [inline] > ip6_sublist_rcv_finish+0x98/0x1e0 net/ipv6/ip6_input.c:84 > ip6_list_rcv_finish net/ipv6/ip6_input.c:118 [inline] > ip6_sublist_rcv+0x80c/0xcf0 net/ipv6/ip6_input.c:282 > ipv6_list_rcv+0x373/0x4b0 net/ipv6/ip6_input.c:316 > __netif_receive_skb_list_ptype net/core/dev.c:5049 [inline] > __netif_receive_skb_list_core+0x1a2/0x9d0 net/core/dev.c:5087 > __netif_receive_skb_list net/core/dev.c:5149 [inline] > netif_receive_skb_list_internal+0x7eb/0xe60 net/core/dev.c:5244 > gro_normal_list.part.0+0x1e/0xb0 net/core/dev.c:5757 > gro_normal_list net/core/dev.c:5755 [inline] > gro_normal_one net/core/dev.c:5769 [inline] > napi_frags_finish net/core/dev.c:5782 [inline] > napi_gro_frags+0xa6a/0xea0 net/core/dev.c:5855 > tun_get_user+0x2e98/0x3fa0 drivers/net/tun.c:1974 > tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2020 > call_write_iter include/linux/fs.h:1890 [inline] > do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693 > do_iter_write fs/read_write.c:976 [inline] > do_iter_write+0x17b/0x380 fs/read_write.c:957 > vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 > do_writev+0x15b/0x330 fs/read_write.c:1064 > __do_sys_writev fs/read_write.c:1137 [inline] > __se_sys_writev fs/read_write.c:1134 [inline] > __x64_sys_writev+0x75/0xb0 fs/read_write.c:1134 > do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x459731 > Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 b9 fb ff c3 48 > 83 ec 08 e8 fa 2c 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 > 89 c2 e8 43 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 > RSP: 002b:7fb4cd361ba0 EFLAGS: 0293 ORIG_RAX: 0014 > RAX: ffda RBX: 002a RCX: 00459731 > RDX: 0001 RSI: 7fb4cd361c00 RDI: 00f0 > RBP: 0075bf20 R08: R09: > R10: R11: 0293 R12: 7fb4cd3626d4 > R13: 004c87e3 R14: 004df640 R15: > > Allocated by task 32407: > save_stack+0x23/0x90 mm/kasan/common.c:69 > set_track mm/kasan/common.c:77 [inline] > __kasan_kmalloc mm/kasan/common.c:486 [inline] > __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:459 > kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:494 > slab_post_alloc_hook mm/slab.h:584 [inline] > slab_alloc mm/slab.c:3319 [inline] > kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 > __build_skb+0x26/0x70 net/core/skbuff.c:310 > __napi_alloc_skb+0x1d2/0x300 net/core/skbuff.c:523 > napi_alloc_skb include/linux/skbuff.h:2801 [inline] > napi_get_frags net/core/dev.c:5742 [inline] > napi_get_frags+0x65/0x140 net/core/dev.c:5737 > tun_napi_alloc_frags drivers/net/tun.c:1473 [inline] > tun_get_user+0x16bd/0x3fa0 drivers/net/tun.c:1834 > tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2020 > call_write_iter include/linux/fs.h:1890 [inline] >
KASAN: slab-out-of-bounds Read in sctp_inq_pop
Hello, syzbot found the following crash on: HEAD commit:9733a7c6 Add linux-next specific files for 20190823 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=143ec11e60 kernel config: https://syzkaller.appspot.com/x/.config?x=f6c78a1438582bd1 dashboard link: https://syzkaller.appspot.com/bug?extid=3ca06c5cb35ee3fc1f89 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+3ca06c5cb35ee3fc1...@syzkaller.appspotmail.com == BUG: KASAN: slab-out-of-bounds in sctp_inq_pop+0xafd/0xd80 net/sctp/inqueue.c:201 Read of size 2 at addr 8880a4e37222 by task syz-executor.3/32407 CPU: 1 PID: 32407 Comm: syz-executor.3 Not tainted 5.3.0-rc5-next-20190823 #72 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:610 __asan_report_load2_noabort+0x14/0x20 mm/kasan/generic_report.c:130 sctp_inq_pop+0xafd/0xd80 net/sctp/inqueue.c:201 sctp_endpoint_bh_rcv+0x184/0x8d0 net/sctp/endpointola.c:335 sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80 sctp_rcv+0x2807/0x3590 net/sctp/input.c:256 sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1049 ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447 dst_input include/net/dst.h:442 [inline] ip6_sublist_rcv_finish+0x98/0x1e0 net/ipv6/ip6_input.c:84 ip6_list_rcv_finish net/ipv6/ip6_input.c:118 [inline] ip6_sublist_rcv+0x80c/0xcf0 net/ipv6/ip6_input.c:282 ipv6_list_rcv+0x373/0x4b0 net/ipv6/ip6_input.c:316 __netif_receive_skb_list_ptype net/core/dev.c:5049 [inline] __netif_receive_skb_list_core+0x1a2/0x9d0 net/core/dev.c:5087 __netif_receive_skb_list net/core/dev.c:5149 [inline] netif_receive_skb_list_internal+0x7eb/0xe60 net/core/dev.c:5244 gro_normal_list.part.0+0x1e/0xb0 net/core/dev.c:5757 gro_normal_list net/core/dev.c:5755 [inline] gro_normal_one net/core/dev.c:5769 [inline] napi_frags_finish net/core/dev.c:5782 [inline] napi_gro_frags+0xa6a/0xea0 net/core/dev.c:5855 tun_get_user+0x2e98/0x3fa0 drivers/net/tun.c:1974 tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2020 call_write_iter include/linux/fs.h:1890 [inline] do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693 do_iter_write fs/read_write.c:976 [inline] do_iter_write+0x17b/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_writev+0x15b/0x330 fs/read_write.c:1064 __do_sys_writev fs/read_write.c:1137 [inline] __se_sys_writev fs/read_write.c:1134 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1134 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459731 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 b9 fb ff c3 48 83 ec 08 e8 fa 2c 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 43 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:7fb4cd361ba0 EFLAGS: 0293 ORIG_RAX: 0014 RAX: ffda RBX: 002a RCX: 00459731 RDX: 0001 RSI: 7fb4cd361c00 RDI: 00f0 RBP: 0075bf20 R08: R09: R10: R11: 0293 R12: 7fb4cd3626d4 R13: 004c87e3 R14: 004df640 R15: Allocated by task 32407: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:486 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:459 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:494 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 __build_skb+0x26/0x70 net/core/skbuff.c:310 __napi_alloc_skb+0x1d2/0x300 net/core/skbuff.c:523 napi_alloc_skb include/linux/skbuff.h:2801 [inline] napi_get_frags net/core/dev.c:5742 [inline] napi_get_frags+0x65/0x140 net/core/dev.c:5737 tun_napi_alloc_frags drivers/net/tun.c:1473 [inline] tun_get_user+0x16bd/0x3fa0 drivers/net/tun.c:1834 tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2020 call_write_iter include/linux/fs.h:1890 [inline] do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693 do_iter_write fs/read_write.c:976 [inline] do_iter_write+0x17b/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_writev+0x15b/0x330 fs/read_write.c:1064 __do_sys_writev fs/read_write.c:1137 [inline]
