sorry forget to sent to lkml earlier Rondreis <linhaoguo86@xxxxxxxxx> 于2022年8月31日周三 16:08写道： > > Hello, > > When fuzzing the Linux kernel driver v5.18.0, the following crash was triggered. > > HEAD commit: 4b0986a3613c92f4ec1bdc7f60ec66fea135991f > git tree: upstream > > kernel config: https://pastebin.com/h9YFR4Vq > C reproducer: https://pastebin.com/VKAKLfNd > console output: https://pastebin.com/Kqck7YEH > > Basically, in the c reproducer, we use the gadget module to emulate > the process of attaching a usb device (vendor id: 0x6a3, product id: > 0xff04, with function: ms and net). > To reproduce this crash, we utilize a third-party library to emulate > the attaching process: https://github.com/linux-usb-gadgets/libusbgx. > Just clone this repository, make install it, and compile the c > reproducer with ``` gcc crash.c -lusbgx -lconfig -o crash ``` will do > the trick. > > It would appreciate if you have any ideal how to solve this bug. > > The crash report is as follow: > > ``` > using random host ethernet address > ================================================================== > BUG: KASAN: use-after-free in copy_gadget_strings > drivers/usb/gadget/composite.c:1363 [inline] > BUG: KASAN: use-after-free in usb_gstrings_attach+0x770/0x890 > drivers/usb/gadget/composite.c:1417 > Read of size 2 at addr ffff888106455b00 by task syz-executor170/9457 > > CPU: 3 PID: 9457 Comm: syz-executor170 Not tainted 5.18.0 #2 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > 1.13.0-1ubuntu1.1 04/01/2014 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 > print_address_description mm/kasan/report.c:313 [inline] > print_report.cold+0xe5/0x659 mm/kasan/report.c:429 > kasan_report+0x8a/0x1b0 mm/kasan/report.c:491 > copy_gadget_strings drivers/usb/gadget/composite.c:1363 [inline] > usb_gstrings_attach+0x770/0x890 drivers/usb/gadget/composite.c:1417 > configfs_composite_bind+0xd0b/0x11b0 drivers/usb/gadget/configfs.c:1382 > udc_bind_to_driver+0x1f4/0x7b0 drivers/usb/gadget/udc/core.c:1504 > usb_gadget_probe_driver+0x335/0x410 drivers/usb/gadget/udc/core.c:1571 > gadget_dev_desc_UDC_store+0x17b/0x220 drivers/usb/gadget/configfs.c:287 > flush_write_buffer fs/configfs/file.c:207 [inline] > configfs_write_iter+0x2ea/0x480 fs/configfs/file.c:229 > call_write_iter include/linux/fs.h:2050 [inline] > new_sync_write+0x393/0x570 fs/read_write.c:504 > vfs_write+0x7c4/0xab0 fs/read_write.c:591 > ksys_write+0x127/0x250 fs/read_write.c:644 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x7f37a0bd5a37 > Code: 89 c7 48 8b 43 08 eb c9 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f > 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d > 00 f0 ff ff4 > RSP: 002b:00007fffba5008d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f37a0bd5a37 > RDX: 000000000000000b RSI: 0000555555f123f0 RDI: 0000000000000003 > RBP: 0000555555f123f0 R08: 0000000000000000 R09: 00007f37a0cc6c00 > R10: 00007f37a0cc6500 R11: 0000000000000246 R12: 000000000000000b > R13: 0000555555f11e10 R14: 00007f37a0cc7c20 R15: 00007f37a0cc77a0 > </TASK> > > Allocated by task 9457: > kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 > kasan_set_track mm/kasan/common.c:45 [inline] > set_alloc_info mm/kasan/common.c:436 [inline] > ____kasan_kmalloc mm/kasan/common.c:515 [inline] > ____kasan_kmalloc mm/kasan/common.c:474 [inline] > __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 > kasan_kmalloc include/linux/kasan.h:234 [inline] > kmem_cache_alloc_trace+0x1f4/0x460 mm/slub.c:3258 > kmalloc include/linux/slab.h:581 [inline] > kzalloc include/linux/slab.h:714 [inline] > gadget_config_name_strings_make+0x50/0x370 drivers/usb/gadget/configfs.c:673 > configfs_mkdir+0x46a/0xb90 fs/configfs/dir.c:1327 > vfs_mkdir+0x620/0x980 fs/namei.c:3931 > do_mkdirat+0x242/0x2b0 fs/namei.c:3957 > __do_sys_mkdir fs/namei.c:3977 [inline] > __se_sys_mkdir fs/namei.c:3975 [inline] > __x64_sys_mkdir+0x61/0x80 fs/namei.c:3975 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > > Freed by task 9467: > kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 > kasan_set_track+0x21/0x30 mm/kasan/common.c:45 > 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+0x11d/0x190 mm/kasan/common.c:374 > kasan_slab_free include/linux/kasan.h:200 [inline] > slab_free_hook mm/slub.c:1728 [inline] > slab_free_freelist_hook mm/slub.c:1754 [inline] > slab_free mm/slub.c:3510 [inline] > kfree+0xec/0x4b0 mm/slub.c:4552 > config_item_cleanup fs/configfs/item.c:128 [inline] > config_item_release+0x11d/0x2f0 fs/configfs/item.c:137 > kref_put include/linux/kref.h:65 [inline] > config_item_put+0x7c/0xa0 fs/configfs/item.c:149 > configfs_rmdir+0x69f/0xa70 fs/configfs/dir.c:1538 > vfs_rmdir fs/namei.c:4017 [inline] > vfs_rmdir+0x2a0/0x640 fs/namei.c:3994 > do_rmdir+0x328/0x390 fs/namei.c:4078 > __do_sys_rmdir fs/namei.c:4097 [inline] > __se_sys_rmdir fs/namei.c:4095 [inline] > __x64_sys_rmdir+0x3e/0x50 fs/namei.c:4095 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > > Last potentially related work creation: > kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 > __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 > insert_work+0x4a/0x390 kernel/workqueue.c:1358 > __queue_work+0x4dd/0x1140 kernel/workqueue.c:1517 > queue_work_on+0xee/0x110 kernel/workqueue.c:1545 > queue_work include/linux/workqueue.h:502 [inline] > call_usermodehelper_exec+0x1cc/0x490 kernel/umh.c:435 > kobject_uevent_env+0xf28/0x1660 lib/kobject_uevent.c:618 > rx_queue_add_kobject net/core/net-sysfs.c:1061 [inline] > net_rx_queue_update_kobjects+0xf8/0x500 net/core/net-sysfs.c:1101 > register_queue_kobjects net/core/net-sysfs.c:1761 [inline] > netdev_register_kobject+0x278/0x430 net/core/net-sysfs.c:2012 > register_netdevice+0xb60/0x1290 net/core/dev.c:9961 > register_netdev+0x2d/0x50 net/core/dev.c:10087 > gether_register_netdev+0xc6/0x150 drivers/usb/gadget/function/u_ether.c:877 > rndis_bind+0x218/0x1060 drivers/usb/gadget/function/f_rndis.c:706 > usb_add_function+0x217/0x930 drivers/usb/gadget/composite.c:337 > configfs_composite_bind+0x8b6/0x11b0 drivers/usb/gadget/configfs.c:1392 > udc_bind_to_driver+0x1f4/0x7b0 drivers/usb/gadget/udc/core.c:1504 > usb_gadget_probe_driver+0x335/0x410 drivers/usb/gadget/udc/core.c:1571 > gadget_dev_desc_UDC_store+0x17b/0x220 drivers/usb/gadget/configfs.c:287 > flush_write_buffer fs/configfs/file.c:207 [inline] > configfs_write_iter+0x2ea/0x480 fs/configfs/file.c:229 > call_write_iter include/linux/fs.h:2050 [inline] > new_sync_write+0x393/0x570 fs/read_write.c:504 > vfs_write+0x7c4/0xab0 fs/read_write.c:591 > ksys_write+0x127/0x250 fs/read_write.c:644 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > > Second to last potentially related work creation: > kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 > __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 > insert_work+0x4a/0x390 kernel/workqueue.c:1358 > __queue_work+0x4dd/0x1140 kernel/workqueue.c:1517 > queue_work_on+0xee/0x110 kernel/workqueue.c:1545 > queue_work include/linux/workqueue.h:502 [inline] > call_usermodehelper_exec+0x1cc/0x490 kernel/umh.c:435 > kobject_uevent_env+0xf28/0x1660 lib/kobject_uevent.c:618 > netdev_queue_add_kobject net/core/net-sysfs.c:1664 [inline] > netdev_queue_update_kobjects+0x3ba/0x4d0 net/core/net-sysfs.c:1705 > register_queue_kobjects net/core/net-sysfs.c:1766 [inline] > netdev_register_kobject+0x35d/0x430 net/core/net-sysfs.c:2012 > register_netdevice+0xb60/0x1290 net/core/dev.c:9961 > register_netdev+0x2d/0x50 net/core/dev.c:10087 > gether_register_netdev+0xc6/0x150 drivers/usb/gadget/function/u_ether.c:877 > rndis_bind+0x218/0x1060 drivers/usb/gadget/function/f_rndis.c:706 > usb_add_function+0x217/0x930 drivers/usb/gadget/composite.c:337 > configfs_composite_bind+0x8b6/0x11b0 drivers/usb/gadget/configfs.c:1392 > udc_bind_to_driver+0x1f4/0x7b0 drivers/usb/gadget/udc/core.c:1504 > usb_gadget_probe_driver+0x335/0x410 drivers/usb/gadget/udc/core.c:1571 > gadget_dev_desc_UDC_store+0x17b/0x220 drivers/usb/gadget/configfs.c:287 > flush_write_buffer fs/configfs/file.c:207 [inline] > configfs_write_iter+0x2ea/0x480 fs/configfs/file.c:229 > call_write_iter include/linux/fs.h:2050 [inline] > new_sync_write+0x393/0x570 fs/read_write.c:504 > vfs_write+0x7c4/0xab0 fs/read_write.c:591 > ksys_write+0x127/0x250 fs/read_write.c:644 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > > The buggy address belongs to the object at ffff888106455b00 > which belongs to the cache kmalloc-192 of size 192 > The buggy address is located 0 bytes inside of > 192-byte region [ffff888106455b00, ffff888106455bc0) > > The buggy address belongs to the physical page: > page:ffffea0004191540 refcount:1 mapcount:0 mapping:0000000000000000 > index:0x0 pfn:0x106455 > flags: 0x57ff00000000200(slab|node=1|zone=2|lastcpupid=0x7ff) > raw: 057ff00000000200 0000000000000000 dead000000000001 ffff888011842a00 > raw: 0000000000000000 0000000080100010 00000001ffffffff 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 > 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 > (swapper/0), ts 187410560 > set_page_owner include/linux/page_owner.h:31 [inline] > post_alloc_hook mm/page_alloc.c:2434 [inline] > prep_new_page+0x297/0x330 mm/page_alloc.c:2441 > get_page_from_freelist+0x210e/0x3ab0 mm/page_alloc.c:4182 > __alloc_pages+0x30c/0x6e0 mm/page_alloc.c:5408 > alloc_page_interleave+0x1e/0x250 mm/mempolicy.c:2104 > alloc_pages+0x1f4/0x250 mm/mempolicy.c:2267 > alloc_slab_page mm/slub.c:1799 [inline] > allocate_slab mm/slub.c:1944 [inline] > new_slab+0x2a9/0x3f0 mm/slub.c:2004 > ___slab_alloc+0xc62/0x1080 mm/slub.c:3005 > __slab_alloc.isra.0+0x4d/0xa0 mm/slub.c:3092 > slab_alloc_node mm/slub.c:3183 [inline] > slab_alloc mm/slub.c:3225 [inline] > kmem_cache_alloc_trace+0x383/0x460 mm/slub.c:3256 > kmalloc include/linux/slab.h:581 [inline] > kzalloc include/linux/slab.h:714 [inline] > call_usermodehelper_setup+0x97/0x340 kernel/umh.c:365 > kobject_uevent_env+0xf09/0x1660 lib/kobject_uevent.c:614 > tty_register_device_attr+0x467/0x6f0 drivers/tty/tty_io.c:3274 > tty_register_device drivers/tty/tty_io.c:3188 [inline] > tty_register_driver+0x42e/0x800 drivers/tty/tty_io.c:3453 > legacy_pty_init drivers/tty/pty.c:589 [inline] > pty_init+0x675/0xe56 drivers/tty/pty.c:953 > do_one_initcall+0x103/0x650 init/main.c:1298 > do_initcall_level init/main.c:1371 [inline] > do_initcalls init/main.c:1387 [inline] > do_basic_setup init/main.c:1406 [inline] > kernel_init_freeable+0x6c3/0x74c init/main.c:1613 > page_owner free stack trace missing > > Memory state around the buggy address: > ffff888106455a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff888106455a80: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > >ffff888106455b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff888106455b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff888106455c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ================================================================== > > > ```
