syzbot


KASAN: use-after-free Write in rxrpc_put_bundle (3)

Status: closed as invalid on 2022/01/07 19:06
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 379d, last: 364d
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Write in rxrpc_put_bundle (2) 1 524d 520d 0/24 auto-closed as invalid on 2021/10/26 20:57
upstream KASAN: use-after-free Write in rxrpc_put_bundle C done 229 787d 810d 17/24 fixed on 2020/11/16 12:12
upstream KASAN: use-after-free Write in rxrpc_put_bundle (4) 1 259d 259d 0/24 auto-closed as invalid on 2022/06/19 15:12

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_dec_return include/linux/atomic/atomic-instrumented.h:251 [inline]
BUG: KASAN: use-after-free in rxrpc_put_bundle+0x1d/0x80 net/rxrpc/conn_client.c:147
Write of size 4 at addr ffff888076fdfd20 by task ksoftirqd/0/13

CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x8d/0x2ed mm/kasan/report.c:247
 __kasan_report mm/kasan/report.c:433 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_dec_return include/linux/atomic/atomic-instrumented.h:251 [inline]
 rxrpc_put_bundle+0x1d/0x80 net/rxrpc/conn_client.c:147
 rxrpc_destroy_connection+0x128/0x2c0 net/rxrpc/conn_object.c:365
 rcu_do_batch kernel/rcu/tree.c:2506 [inline]
 rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2741
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:921 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 32479:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:269 [inline]
 kmem_cache_alloc_trace+0x1ea/0x4a0 mm/slab.c:3575
 kmalloc include/linux/slab.h:590 [inline]
 kzalloc include/linux/slab.h:724 [inline]
 rxrpc_alloc_bundle+0x8c/0x300 net/rxrpc/conn_client.c:121
 rxrpc_look_up_bundle net/rxrpc/conn_client.c:299 [inline]
 rxrpc_prep_call net/rxrpc/conn_client.c:372 [inline]
 rxrpc_connect_call+0x5a5/0x15c0 net/rxrpc/conn_client.c:708
 rxrpc_new_client_call+0x961/0x1020 net/rxrpc/call_object.c:330
 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:605 [inline]
 rxrpc_do_sendmsg+0xee8/0x1350 net/rxrpc/sendmsg.c:658
 rxrpc_sendmsg+0x420/0x630 net/rxrpc/af_rxrpc.c:561
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 13:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xd1/0x110 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:235 [inline]
 __cache_free mm/slab.c:3445 [inline]
 kfree+0x10d/0x2c0 mm/slab.c:3802
 rxrpc_free_bundle net/rxrpc/conn_client.c:141 [inline]
 rxrpc_put_bundle+0x6b/0x80 net/rxrpc/conn_client.c:151
 rxrpc_destroy_connection+0x128/0x2c0 net/rxrpc/conn_object.c:365
 rcu_do_batch kernel/rcu/tree.c:2506 [inline]
 rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2741
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558

Last potentially related work creation:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xb5/0xe0 mm/kasan/generic.c:348
 insert_work+0x48/0x370 kernel/workqueue.c:1354
 __queue_work+0x5ca/0xee0 kernel/workqueue.c:1520
 queue_work_on+0xee/0x110 kernel/workqueue.c:1547
 queue_work include/linux/workqueue.h:502 [inline]
 call_usermodehelper_exec+0x347/0x4c0 kernel/umh.c:435
 call_modprobe kernel/kmod.c:98 [inline]
 __request_module+0x430/0xa60 kernel/kmod.c:170
 search_binary_handler fs/exec.c:1738 [inline]
 exec_binprm fs/exec.c:1764 [inline]
 bprm_execve fs/exec.c:1833 [inline]
 bprm_execve+0x941/0x19b0 fs/exec.c:1795
 do_execveat_common+0x5e3/0x780 fs/exec.c:1922
 do_execve fs/exec.c:1990 [inline]
 __do_sys_execve fs/exec.c:2066 [inline]
 __se_sys_execve fs/exec.c:2061 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:2061
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xb5/0xe0 mm/kasan/generic.c:348
 insert_work+0x48/0x370 kernel/workqueue.c:1354
 __queue_work+0x5ca/0xee0 kernel/workqueue.c:1520
 queue_work_on+0xee/0x110 kernel/workqueue.c:1547
 queue_work include/linux/workqueue.h:502 [inline]
 call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:435
 kobject_uevent_env+0xf8f/0x1650 lib/kobject_uevent.c:618
 rx_queue_add_kobject net/core/net-sysfs.c:1069 [inline]
 net_rx_queue_update_kobjects+0xf8/0x500 net/core/net-sysfs.c:1109
 register_queue_kobjects net/core/net-sysfs.c:1766 [inline]
 netdev_register_kobject+0x275/0x430 net/core/net-sysfs.c:2014
 register_netdevice+0xd31/0x1500 net/core/dev.c:10336
 veth_newlink+0x593/0xb00 drivers/net/veth.c:1726
 __rtnl_newlink+0x106d/0x1750 net/core/rtnetlink.c:3458
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 __sys_sendto+0x21c/0x320 net/socket.c:2036
 __do_sys_sendto net/socket.c:2048 [inline]
 __se_sys_sendto net/socket.c:2044 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888076fdfd00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 32 bytes inside of
 192-byte region [ffff888076fdfd00, ffff888076fdfdc0)
The buggy address belongs to the page:
page:ffffea0001dbf7c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888076fdfc00 pfn:0x76fdf
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0001bf7348 ffffea0001be3f48 ffff888010c40000
raw: ffff888076fdfc00 ffff888076fdf000 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 24039, ts 2484648602781, free_ts 2475660793047
 prep_new_page mm/page_alloc.c:2418 [inline]
 get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
 __alloc_pages_node include/linux/gfp.h:570 [inline]
 kmem_getpages mm/slab.c:1377 [inline]
 cache_grow_begin+0x75/0x470 mm/slab.c:2593
 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965
 ____cache_alloc mm/slab.c:3048 [inline]
 ____cache_alloc mm/slab.c:3031 [inline]
 __do_cache_alloc mm/slab.c:3275 [inline]
 slab_alloc mm/slab.c:3316 [inline]
 __do_kmalloc mm/slab.c:3700 [inline]
 __kmalloc_track_caller+0x3b0/0x4d0 mm/slab.c:3717
 kmemdup+0x23/0x50 mm/util.c:128
 kmemdup include/linux/fortify-string.h:304 [inline]
 neigh_parms_alloc+0x7e/0x540 net/core/neighbour.c:1663
 ipv6_add_dev+0x30c/0x1170 net/ipv6/addrconf.c:400
 addrconf_notify+0x60e/0x1bb0 net/ipv6/addrconf.c:3510
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2002
 call_netdevice_notifiers_extack net/core/dev.c:2014 [inline]
 call_netdevice_notifiers net/core/dev.c:2028 [inline]
 register_netdevice+0x1073/0x1500 net/core/dev.c:10367
 veth_newlink+0x3fc/0xb00 drivers/net/veth.c:1695
 __rtnl_newlink+0x106d/0x1750 net/core/rtnetlink.c:3458
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3309 [inline]
 free_unref_page_list+0x1a9/0xfa0 mm/page_alloc.c:3425
 release_pages+0x3f4/0x1480 mm/swap.c:980
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu mm/mmu_gather.c:249 [inline]
 tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:340
 exit_mmap+0x1ea/0x630 mm/mmap.c:3172
 __mmput+0x122/0x4b0 kernel/fork.c:1113
 mmput+0x56/0x60 kernel/fork.c:1134
 exit_mm kernel/exit.c:507 [inline]
 do_exit+0xb27/0x2b40 kernel/exit.c:819
 do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x47d/0x2220 kernel/signal.c:2852
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff888076fdfc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888076fdfc80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888076fdfd00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888076fdfd80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888076fdfe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2021/12/06 14:48 upstream 0fcfb00b28c0 579a8754 .config log report info KASAN: use-after-free Write in rxrpc_put_bundle
ci-upstream-kasan-gce-root 2021/11/20 20:07 upstream a90af8f15bdc 4eb20a4e .config log report info KASAN: use-after-free Write in rxrpc_put_bundle
* Struck through repros no longer work on HEAD.