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SMTP id e9e14a558f8ab-3a397ce56b2mr43683915ab.6.1728548733196; Thu, 10 Oct 2024 01:25:33 -0700 (PDT) Date: Thu, 10 Oct 2024 01:25:33 -0700 In-Reply-To: <000000000000657ecd0614456af8@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67078f7d.050a0220.1139e6.001e.GAE@google.com> Subject: Re: [syzbot] Re: [syzbot] [net?] KASAN: slab-use-after-free Read in __ethtool_get_link_ksettings From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Read in __ethtool_g= et_link_ksettings Author: cmeiohas@nvidia.com #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git fo= r-next diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/dev= ice.c index 93c6d27b5d8f..eafdf1741582 100644 --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -2062,19 +2062,14 @@ void ib_dispatch_event_clients(struct ib_event *eve= nt) =C2=A0=C2=A0=C2=A0=C2=A0 up_read(&event->device->event_handler_rwsem); =C2=A0} -static int iw_query_port(struct ib_device *device, -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 u32 port_num, -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 struct ib_port_attr *port_attr) +static int iw_query_port(struct ib_device *device, u32 port_num, +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct i= b_port_attr *port_attr, +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct n= et_device *netdev) =C2=A0{ =C2=A0=C2=A0=C2=A0=C2=A0 struct in_device *inetdev; -=C2=A0=C2=A0=C2=A0 struct net_device *netdev; =C2=A0=C2=A0=C2=A0=C2=A0 memset(port_attr, 0, sizeof(*port_attr)); -=C2=A0=C2=A0=C2=A0 netdev =3D ib_device_get_netdev(device, port_num); -=C2=A0=C2=A0=C2=A0 if (!netdev) -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -ENODEV; - =C2=A0=C2=A0=C2=A0=C2=A0 port_attr->max_mtu =3D IB_MTU_4096; =C2=A0=C2=A0=C2=A0=C2=A0 port_attr->active_mtu =3D ib_mtu_int_to_enum(netde= v->mtu); @@ -2097,7 +2092,6 @@ static int iw_query_port(struct ib_device *device, =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 rcu_read_unlock(); =C2=A0=C2=A0=C2=A0=C2=A0 } -=C2=A0=C2=A0=C2=A0 dev_put(netdev); =C2=A0=C2=A0=C2=A0=C2=A0 return device->ops.query_port(device, port_num, po= rt_attr); =C2=A0} @@ -2135,13 +2129,27 @@ int ib_query_port(struct ib_device *device, =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 u32 port_num, =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct ib_port= _attr *port_attr) =C2=A0{ +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct net_device *netdev =3D NULL; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 int ret; + =C2=A0=C2=A0=C2=A0=C2=A0 if (!rdma_is_port_valid(device, port_num)) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -EINVAL; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (rdma_protocol_iwarp(device, port_= num) || +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 rdma_protocol= _roce(device, port_num)) { +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 netdev =3D ib_device_get_netdev(device, port_num); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 if (!netdev) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -ENODEV= ; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } + =C2=A0=C2=A0=C2=A0=C2=A0 if (rdma_protocol_iwarp(device, port_num)) -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return iw_query_port(device, po= rt_num, port_attr); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 ret =3D iw_query_port(device, port_num, port_attr, netdev); =C2=A0=C2=A0=C2=A0=C2=A0 else -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return __ib_query_port(device, = port_num, port_attr); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 ret =3D __ib_query_port(device, port_num, port_attr); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (netdev) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 dev_put(netdev); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return ret; + =C2=A0} =C2=A0EXPORT_SYMBOL(ib_query_port); diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rx= e/rxe_net.c index 75d1407db52d..c5d439bebc24 100644 --- a/drivers/infiniband/sw/rxe/rxe_net.c +++ b/drivers/infiniband/sw/rxe/rxe_net.c @@ -605,6 +605,7 @@ static int rxe_notify(struct notifier_block *not_blk, =C2=A0=C2=A0=C2=A0=C2=A0 switch (event) { =C2=A0=C2=A0=C2=A0=C2=A0 case NETDEV_UNREGISTER: +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ib_device_set_netdev(&rxe->ib_d= ev, NULL, 1); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ib_unregister_device_queue= d(&rxe->ib_dev); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 break; =C2=A0=C2=A0=C2=A0=C2=A0 case NETDEV_UP: diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/s= iw/siw_main.c index 17abef48abcd..1b7d34798783 100644 --- a/drivers/infiniband/sw/siw/siw_main.c +++ b/drivers/infiniband/sw/siw/siw_main.c @@ -400,6 +400,7 @@ static int siw_netdev_event(struct notifier_block *nb, = unsigned long event, =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 break; =C2=A0=C2=A0=C2=A0=C2=A0 case NETDEV_UNREGISTER: +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ib_device_set_netdev(&sdev->bas= e_dev, NULL, 1); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ib_unregister_device_queue= d(&sdev->base_dev); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 break; On 08/10/2024 15:24, syzbot wrote: > External email: Use caution opening links or attachments > > > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggeri= ng an issue: > KASAN: slab-use-after-free Read in __ethtool_get_link_ksettings > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x6e/0x19= 0 net/ethtool/ioctl.c:442 > Read of size 8 at addr ffff8880673be308 by task kworker/0:1/9 > > CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.12.0-rc2-syzkaller-g= 615b94746a54-dirty #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G= oogle 09/13/2024 > Workqueue: events smc_ib_port_event_work > Call Trace: > > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 > print_address_description mm/kasan/report.c:377 [inline] > print_report+0x169/0x550 mm/kasan/report.c:488 > kasan_report+0x143/0x180 mm/kasan/report.c:601 > __ethtool_get_link_ksettings+0x6e/0x190 net/ethtool/ioctl.c:442 > ib_get_eth_speed+0x160/0x800 drivers/infiniband/core/verbs.c:1996 > rxe_query_port+0x76/0x260 drivers/infiniband/sw/rxe/rxe_verbs.c:55 > __ib_query_port drivers/infiniband/core/device.c:2105 [inline] > ib_query_port+0x208/0x870 drivers/infiniband/core/device.c:2147 > smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline] > smc_ib_port_event_work+0x14e/0xa50 net/smc/smc_ib.c:388 > process_one_work kernel/workqueue.c:3229 [inline] > process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 > worker_thread+0x870/0xd30 kernel/workqueue.c:3391 > kthread+0x2f0/0x390 kernel/kthread.c:389 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > > > Allocated by task 5967: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 > poison_kmalloc_redzone mm/kasan/common.c:377 [inline] > __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 > kasan_kmalloc include/linux/kasan.h:257 [inline] > __do_kmalloc_node mm/slub.c:4264 [inline] > __kmalloc_node_noprof+0x22a/0x440 mm/slub.c:4270 > __kvmalloc_node_noprof+0x72/0x190 mm/util.c:658 > alloc_netdev_mqs+0x9b/0x1000 net/core/dev.c:11097 > rtnl_create_link+0x2f9/0xc20 net/core/rtnetlink.c:3374 > rtnl_newlink_create net/core/rtnetlink.c:3500 [inline] > __rtnl_newlink net/core/rtnetlink.c:3730 [inline] > rtnl_newlink+0x1423/0x20a0 net/core/rtnetlink.c:3743 > rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6646 > netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 > netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] > netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357 > netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 > sock_sendmsg_nosec net/socket.c:729 [inline] > __sock_sendmsg+0x221/0x270 net/socket.c:744 > __sys_sendto+0x39b/0x4f0 net/socket.c:2209 > __do_sys_sendto net/socket.c:2221 [inline] > __se_sys_sendto net/socket.c:2217 [inline] > __x64_sys_sendto+0xde/0x100 net/socket.c:2217 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Freed by task 11: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 > kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 > poison_slab_object mm/kasan/common.c:247 [inline] > __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 > kasan_slab_free include/linux/kasan.h:230 [inline] > slab_free_hook mm/slub.c:2342 [inline] > slab_free mm/slub.c:4579 [inline] > kfree+0x1a0/0x440 mm/slub.c:4727 > device_release+0x99/0x1c0 > kobject_cleanup lib/kobject.c:689 [inline] > kobject_release lib/kobject.c:720 [inline] > kref_put include/linux/kref.h:65 [inline] > kobject_put+0x22f/0x480 lib/kobject.c:737 > netdev_run_todo+0xe79/0x1000 net/core/dev.c:10816 > default_device_exit_batch+0xa24/0xaa0 net/core/dev.c:11949 > ops_exit_list net/core/net_namespace.c:178 [inline] > cleanup_net+0x89d/0xcc0 net/core/net_namespace.c:626 > process_one_work kernel/workqueue.c:3229 [inline] > process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 > worker_thread+0x870/0xd30 kernel/workqueue.c:3391 > kthread+0x2f0/0x390 kernel/kthread.c:389 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > > The buggy address belongs to the object at ffff8880673be000 > which belongs to the cache kmalloc-cg-4k of size 4096 > The buggy address is located 776 bytes inside of > freed 4096-byte region [ffff8880673be000, ffff8880673bf000) > > The buggy address belongs to the physical page: > page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x673b= 8 > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > memcg:ffff888031406a41 > flags: 0xfff00000000040(head|node=3D0|zone=3D1|lastcpupid=3D0x7ff) > page_type: f5(slab) > raw: 00fff00000000040 ffff88801ac4f500 dead000000000122 0000000000000000 > raw: 0000000000000000 0000000000040004 00000001f5000000 ffff888031406a41 > head: 00fff00000000040 ffff88801ac4f500 dead000000000122 0000000000000000 > head: 0000000000000000 0000000000040004 00000001f5000000 ffff888031406a41 > head: 00fff00000000003 ffffea00019cee01 ffffffffffffffff 0000000000000000 > head: 0000000700000008 0000000000000000 00000000ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(= __GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), = pid 5982, tgid 5982 (syz-executor), ts 102124010087, free_ts 96435310364 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 > prep_new_page mm/page_alloc.c:1545 [inline] > get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457 > __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733 > alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 > alloc_slab_page+0x6a/0x120 mm/slub.c:2412 > allocate_slab+0x5a/0x2f0 mm/slub.c:2578 > new_slab mm/slub.c:2631 [inline] > ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818 > __slab_alloc+0x58/0xa0 mm/slub.c:3908 > __slab_alloc_node mm/slub.c:3961 [inline] > slab_alloc_node mm/slub.c:4122 [inline] > __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4290 > kmalloc_noprof include/linux/slab.h:878 [inline] > kzalloc_noprof include/linux/slab.h:1014 [inline] > snmp6_alloc_dev net/ipv6/addrconf.c:359 [inline] > ipv6_add_dev+0x570/0x1220 net/ipv6/addrconf.c:409 > addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3655 > notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 > call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] > call_netdevice_notifiers net/core/dev.c:2048 [inline] > register_netdevice+0x167f/0x1b00 net/core/dev.c:10524 > veth_newlink+0x855/0xce0 drivers/net/veth.c:1861 > rtnl_newlink_create net/core/rtnetlink.c:3510 [inline] > __rtnl_newlink net/core/rtnetlink.c:3730 [inline] > rtnl_newlink+0x1591/0x20a0 net/core/rtnetlink.c:3743 > rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6646 > page last free pid 5869 tgid 5869 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > free_pages_prepare mm/page_alloc.c:1108 [inline] > free_unref_folios+0xf12/0x18d0 mm/page_alloc.c:2686 > folios_put_refs+0x76c/0x860 mm/swap.c:1007 > free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:332 > __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] > tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] > tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] > tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 > tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 > vms_clear_ptes+0x437/0x530 mm/vma.c:1096 > vms_complete_munmap_vmas+0x208/0x910 mm/vma.c:1140 > do_vmi_align_munmap+0x613/0x730 mm/vma.c:1349 > do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1397 > __vm_munmap+0x24c/0x480 mm/mmap.c:1600 > __do_sys_munmap mm/mmap.c:1617 [inline] > __se_sys_munmap mm/mmap.c:1614 [inline] > __x64_sys_munmap+0x68/0x80 mm/mmap.c:1614 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Memory state around the buggy address: > ffff8880673be200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880673be280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ffff8880673be300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8880673be380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880673be400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > Tested on: > > commit: 615b9474 RDMA/hns: Disassociate mmap pages for all uct.. > git tree: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma= .git for-next > console output: https://syzkaller.appspot.com/x/log.txt?x=3D131b170798000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D7cd9e7e4a8a0a= 15b > dashboard link: https://syzkaller.appspot.com/bug?extid=3D5fe14f2ff4ccbac= e9a26 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Deb= ian) 2.40 > patch: https://syzkaller.appspot.com/x/patch.diff?x=3D17698f9f98= 0000 > >