================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock_irq include/linux/spinlock_api_smp.h:165 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irq+0x54/0x78 kernel/locking/spinlock.c:189 Read of size 1 at addr ffff00001715b818 by task syz.0.412/4533 CPU: 1 UID: 0 PID: 4533 Comm: syz.0.412 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x7c/0xb0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x18c/0x4e8 mm/kasan/report.c:482 kasan_report+0xb8/0x15c mm/kasan/report.c:595 __kasan_check_byte+0x54/0x74 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire kernel/locking/lockdep.c:5860 [inline] lock_acquire+0x248/0x44c kernel/locking/lockdep.c:5843 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:165 [inline] _raw_spin_lock_irq+0x54/0x78 kernel/locking/spinlock.c:189 spin_lock_irq include/linux/spinlock.h:377 [inline] gadget_dev_open+0x3c/0x164 drivers/usb/gadget/legacy/inode.c:1928 do_dentry_open+0x37c/0xfe8 fs/open.c:996 vfs_open+0x5c/0x300 fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x12d4/0x1e40 fs/namei.c:5000 do_file_open+0x18c/0x380 fs/namei.c:5029 do_sys_openat2+0xdc/0x180 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __arm64_sys_openat+0x134/0x1e0 fs/open.c:1434 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x74/0x240 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x58/0x2a4 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Allocated by task 3390: kasan_save_stack+0x3c/0x70 mm/kasan/common.c:57 kasan_save_track+0x20/0x3c mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x5c mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xb8/0xc0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x308/0x628 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] dev_new drivers/usb/gadget/legacy/inode.c:176 [inline] gadgetfs_fill_super+0x1b0/0x380 drivers/usb/gadget/legacy/inode.c:2063 vfs_get_super fs/super.c:1405 [inline] get_tree_single+0xb0/0x158 fs/super.c:1432 gadgetfs_get_tree+0x18/0x24 drivers/usb/gadget/legacy/inode.c:2094 vfs_get_tree+0x74/0x280 fs/super.c:1947 fc_mount+0x18/0x19c fs/namespace.c:1198 do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount fs/namespace.c:3848 [inline] path_mount+0x6d8/0x1830 fs/namespace.c:4168 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount fs/namespace.c:4374 [inline] __arm64_sys_mount+0x318/0x3dc fs/namespace.c:4374 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x74/0x240 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x58/0x2a4 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Freed by task 4515: kasan_save_stack+0x3c/0x70 mm/kasan/common.c:57 kasan_save_track+0x20/0x3c mm/kasan/common.c:78 kasan_save_free_info+0x4c/0x80 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x88 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6499 [inline] kfree+0x2e8/0x750 mm/slub.c:6792 put_dev+0xa4/0xe0 drivers/usb/gadget/legacy/inode.c:169 dev_release+0xd4/0x174 drivers/usb/gadget/legacy/inode.c:1224 __fput+0x2d0/0x980 fs/file_table.c:512 ____fput+0x14/0x20 fs/file_table.c:540 task_work_run+0x134/0x238 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x190/0x1c8 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] arm64_syscall_exit_to_user_mode arch/arm64/kernel/entry-common.c:108 [inline] el0_svc+0x244/0x2a4 arch/arm64/kernel/entry-common.c:759 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 The buggy address belongs to the object at ffff00001715b800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 24 bytes inside of freed 1024-byte region [ffff00001715b800, ffff00001715bc00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff000017158000 pfn:0x57158 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x1ffc00000000240(workingset|head|node=0|zone=0|lastcpupid=0x7ff) page_type: f5(slab) raw: 01ffc00000000240 ffff00000e001dc0 fffffdffc04c1610 fffffdffc03bc210 raw: ffff000017158000 0000000000100007 00000000f5000000 0000000000000000 head: 01ffc00000000240 ffff00000e001dc0 fffffdffc04c1610 fffffdffc03bc210 head: ffff000017158000 0000000000100007 00000000f5000000 0000000000000000 head: 01ffc00000000003 fffffdffc05c5601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00001715b700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff00001715b780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff00001715b800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00001715b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00001715b900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.h:68:9 index 1830 is out of range for type 'long unsigned int [8]' CPU: 1 UID: 0 PID: 4533 Comm: syz.0.412 Tainted: G B W syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE, [W]=WARN Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x7c/0xb0 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 ubsan_epilogue+0x10/0x44 lib/ubsan.c:233 __ubsan_handle_out_of_bounds+0xa0/0xc4 lib/ubsan.c:455 decode_tail kernel/locking/qspinlock.h:68 [inline] queued_spin_lock_slowpath+0xf0c/0xfa0 kernel/locking/qspinlock.c:307 queued_spin_lock include/asm-generic/qspinlock.h:115 [inline] do_raw_spin_lock+0x258/0x308 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:166 [inline] _raw_spin_lock_irq+0x5c/0x78 kernel/locking/spinlock.c:189 spin_lock_irq include/linux/spinlock.h:377 [inline] gadget_dev_open+0x3c/0x164 drivers/usb/gadget/legacy/inode.c:1928 do_dentry_open+0x37c/0xfe8 fs/open.c:996 vfs_open+0x5c/0x300 fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x12d4/0x1e40 fs/namei.c:5000 do_file_open+0x18c/0x380 fs/namei.c:5029 do_sys_openat2+0xdc/0x180 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __arm64_sys_openat+0x134/0x1e0 fs/open.c:1434 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x74/0x240 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x58/0x2a4 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 ---[ end trace ]--- Unable to handle kernel paging request at virtual address ffff80008777b0a0 KASAN: probably user-memory-access in range [0x000000043bbd8500-0x000000043bbd8507] Mem abort info: ESR = 0x0000000096000047 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x07: level 3 translation fault Data abort info: ISV = 0, ISS = 0x00000047, ISS2 = 0x00000000 CM = 0, WnR = 1, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000047695000 [ffff80008777b0a0] pgd=0000000000000000, p4d=100000004dd69003, pud=100000004dd6a003, pmd=100000004dd6d003, pte=0000000000000000 Internal error: Oops: 0000000096000047 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 4533 Comm: syz.0.412 Tainted: G B W syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE, [W]=WARN Hardware name: linux,dummy-virt (DT) pstate: 000000c5 (nzcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x97c/0xfa0 kernel/locking/qspinlock.c:310 lr : decode_tail kernel/locking/qspinlock.h:68 [inline] lr : queued_spin_lock_slowpath+0xf0c/0xfa0 kernel/locking/qspinlock.c:307 sp : ffff8000a0fd7600 x29: ffff8000a0fd76b0 x28: ffff00006bfb6088 x27: ffff80008777b0a0 x26: 1fffe00002e2b700 x25: ffff00006bfb6080 x24: 0000000000000000 x23: 0000000000000000 x22: 1ffff000141faec6 x21: ffff8000877c7ee0 x20: ffff00006bfb6080 x19: ffff00001715b800 x18: 0000000000000000 x17: 363a682e6b636f6c x16: 6e697073712f676e x15: 0000000000000002 x14: 0000000000000000 x13: 0000000000000001 x12: ffff700011269431 x11: 1ffff00011269430 x10: ffff700011269430 x9 : dfff800000000000 x8 : 0000000000000003 x7 : 0000000000000001 x6 : ffff700011269430 x5 : 1ffff00010eef614 x4 : 0000000000000000 x3 : ffff800080222324 x2 : ffff80008934a180 x1 : 0000000000000000 x0 : ffff80008777b0a0 Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:233 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) queued_spin_lock_slowpath+0x97c/0xfa0 kernel/locking/qspinlock.c:313 (P) queued_spin_lock include/asm-generic/qspinlock.h:115 [inline] do_raw_spin_lock+0x258/0x308 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:166 [inline] _raw_spin_lock_irq+0x5c/0x78 kernel/locking/spinlock.c:189 spin_lock_irq include/linux/spinlock.h:377 [inline] gadget_dev_open+0x3c/0x164 drivers/usb/gadget/legacy/inode.c:1928 do_dentry_open+0x37c/0xfe8 fs/open.c:996 vfs_open+0x5c/0x300 fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x12d4/0x1e40 fs/namei.c:5000 do_file_open+0x18c/0x380 fs/namei.c:5029 do_sys_openat2+0xdc/0x180 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __arm64_sys_openat+0x134/0x1e0 fs/open.c:1434 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x74/0x240 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x58/0x2a4 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Code: d343fc05 38e468a4 35002b04 d2800018 (f8216b79) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d343fc05 lsr x5, x0, #3 4: 38e468a4 ldrsb w4, [x5, x4] 8: 35002b04 cbnz w4, 0x568 c: d2800018 mov x24, #0x0 // #0 * 10: f8216b79 str x25, [x27, x1] <-- trapping instruction