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================================================================== BUG: KASAN: use-after-free in usb_udc_uevent+0xae/0x110 drivers/usb/gadget/udc/core.c:1597 Read of size 8 at addr ffff8881f22ce010 by task udevd/162 CPU: 1 PID: 162 Comm: udevd Not tainted 5.4.259-syzkaller-00001-g9ca091c99214 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 usb_udc_uevent+0xae/0x110 drivers/usb/gadget/udc/core.c:1597 dev_uevent+0x4e9/0x6f0 drivers/base/core.c:1887 uevent_show+0x19a/0x320 drivers/base/core.c:1943 dev_attr_show+0x50/0xb0 drivers/base/core.c:1647 sysfs_kf_seq_show+0x265/0x3e0 fs/sysfs/file.c:61 seq_read+0x4df/0xe60 fs/seq_file.c:232 __vfs_read+0x103/0x730 fs/read_write.c:425 vfs_read+0x148/0x360 fs/read_write.c:461 ksys_read+0x199/0x2c0 fs/read_write.c:587 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 2102: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] dev_new drivers/usb/gadget/legacy/raw_gadget.c:182 [inline] raw_open+0x85/0x380 drivers/usb/gadget/legacy/raw_gadget.c:372 misc_open+0x300/0x370 drivers/char/misc.c:141 chrdev_open+0x54a/0x630 fs/char_dev.c:414 do_dentry_open+0x964/0x1130 fs/open.c:796 do_last fs/namei.c:3515 [inline] path_openat+0x2992/0x3480 fs/namei.c:3634 do_filp_open+0x20b/0x450 fs/namei.c:3664 do_sys_open+0x39c/0x810 fs/open.c:1113 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 2101: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kfree+0x123/0x370 mm/slub.c:4071 raw_release+0x134/0x1e0 drivers/usb/gadget/legacy/raw_gadget.c:411 __fput+0x262/0x680 fs/file_table.c:281 task_work_run+0x140/0x170 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x190/0x1a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881f22ce000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 16 bytes inside of 4096-byte region [ffff8881f22ce000, ffff8881f22cf000) The buggy address belongs to the page: page:ffffea0007c8b200 refcount:1 mapcount:0 mapping:ffff8881f5c0c280 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c0c280 raw: 0000000000000000 0000000000040004 00000001ffffffff 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) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc_trace+0x12d/0x260 mm/slub.c:2854 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] snmp6_alloc_dev net/ipv6/addrconf.c:349 [inline] ipv6_add_dev+0x599/0x10a0 net/ipv6/addrconf.c:398 addrconf_notify+0x59b/0xe50 net/ipv6/addrconf.c:3539 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] register_netdevice+0xeef/0x12a0 net/core/dev.c:9213 veth_newlink+0x835/0xb50 drivers/net/veth.c:1329 __rtnl_newlink net/core/rtnetlink.c:3255 [inline] rtnl_newlink+0x1567/0x2060 net/core/rtnetlink.c:3314 rtnetlink_rcv_msg+0x983/0xc70 net/core/rtnetlink.c:5291 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2481 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 __free_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0x44/0x180 mm/slub.c:2324 __slab_free+0x297/0x360 mm/slub.c:2971 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc_trace+0xdc/0x260 mm/slub.c:2854 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] kset_create lib/kobject.c:977 [inline] kset_create_and_add+0x55/0x2a0 lib/kobject.c:1020 register_queue_kobjects net/core/net-sysfs.c:1624 [inline] netdev_register_kobject+0x1a0/0x310 net/core/net-sysfs.c:1858 register_netdevice+0xbc5/0x12a0 net/core/dev.c:9182 veth_newlink+0x667/0xb50 drivers/net/veth.c:1302 __rtnl_newlink net/core/rtnetlink.c:3255 [inline] rtnl_newlink+0x1567/0x2060 net/core/rtnetlink.c:3314 rtnetlink_rcv_msg+0x983/0xc70 net/core/rtnetlink.c:5291 Memory state around the buggy address: ffff8881f22cdf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881f22cdf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881f22ce000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881f22ce080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881f22ce100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024/01/19 10:03 | android12-5.4 | 9ca091c99214 | 21772ce4 | .config | console log | report | info | ci2-android-5-4-kasan | KASAN: use-after-free Read in usb_udc_uevent |