================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf801c243e50 by task syz-executor.0/2552 CPU: 0 PID: 2552 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 [] save_stack+0x112/0x16c mm/page_owner.c:121 Allocated by task 0: (stack is not available) Last potentially related work creation: ------------[ cut here ]------------ slab index 274560 out of bounds (370) for stack id 09c43080 WARNING: CPU: 0 PID: 2552 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2552 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2552 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : stack_depot_fetch lib/stackdepot.c:304 [inline] epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 ra : stack_depot_fetch lib/stackdepot.c:304 [inline] ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf801c243d10 gp : ffffffff85863ac0 tp : ffffaf8009c43080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf801c243d20 s1 : ffffaf807ae332d8 a0 : 000000000000003b a1 : 00000000000f0000 a2 : 0000000000000505 a3 : ffffffff8012252a a4 : 7e8ec06d9e5d1300 a5 : 7e8ec06d9e5d1300 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf801c243e50 s3 : ffffaf80072ed280 s4 : ffffaf801c243d98 s5 : ffffaf801c243e40 s6 : 0000000000003fff s7 : ffffaf801c243df0 s8 : ffffaf805a9de970 s9 : ffffffffffffc000 s10: ffffaf801c243ec0 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf801c243818 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:216 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2fc/0x330 mm/kasan/report.c:263 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 [] save_stack+0x112/0x16c mm/page_owner.c:121 irq event stamp: 85847 hardirqs last enabled at (85846): [] rmqueue_pcplist mm/page_alloc.c:3671 [inline] hardirqs last enabled at (85846): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last enabled at (85846): [] get_page_from_freelist+0xfc8/0x12d8 mm/page_alloc.c:4162 hardirqs last disabled at (85847): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (85847): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (85150): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (85150): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (85155): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (85155): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (85155): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- Second to last potentially related work creation: ------------[ cut here ]------------ slab index 2076544 out of bounds (370) for stack id ffffaf80 WARNING: CPU: 0 PID: 2552 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2552 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2552 Comm: syz-executor.0 Tainted: G W 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : stack_depot_fetch lib/stackdepot.c:304 [inline] epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 ra : stack_depot_fetch lib/stackdepot.c:304 [inline] ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf801c243d10 gp : ffffffff85863ac0 tp : ffffaf8009c43080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf801c243d20 s1 : ffffaf807ae332d8 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000505 a3 : ffffffff8012252a a4 : 7e8ec06d9e5d1300 a5 : 7e8ec06d9e5d1300 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf801c243e50 s3 : ffffaf80072ed280 s4 : ffffaf801c243d98 s5 : ffffaf801c243e40 s6 : 0000000000003fff s7 : ffffaf801c243df0 s8 : ffffaf805a9de970 s9 : ffffffffffffc000 s10: ffffaf801c243ec0 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf801c243818 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:221 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2ae/0x330 mm/kasan/report.c:263 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 [] save_stack+0x112/0x16c mm/page_owner.c:121 irq event stamp: 85847 hardirqs last enabled at (85846): [] rmqueue_pcplist mm/page_alloc.c:3671 [inline] hardirqs last enabled at (85846): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last enabled at (85846): [] get_page_from_freelist+0xfc8/0x12d8 mm/page_alloc.c:4162 hardirqs last disabled at (85847): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (85847): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (85150): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (85150): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (85155): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (85155): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (85155): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf801c243d98 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 16 bytes to the right of 168-byte region [ffffaf801c243d98, ffffaf801c243e40) The buggy address belongs to the page: page:ffffaf807ae332d8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9c443 flags: 0x9800000200(slab|section=19|node=0|zone=0) raw: 0000009800000200 0000000000000000 0000000000000122 ffffaf80072ed280 raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 2550, ts 711087179200, free_ts 711078988800 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x76/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x39c/0x3de mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [inline] __kernfs_new_node+0xfc/0x5f2 fs/kernfs/dir.c:585 kernfs_new_node+0x66/0xbe fs/kernfs/dir.c:647 __kernfs_create_file+0x4e/0x1e8 fs/kernfs/file.c:987 sysfs_add_file_mode_ns+0x138/0x254 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x274/0x722 fs/sysfs/group.c:148 sysfs_create_group+0x22/0x2e fs/sysfs/group.c:174 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 free_pages.part.0+0xe0/0xf6 mm/page_alloc.c:5485 free_pages+0xe/0x18 mm/page_alloc.c:5482 pgd_free include/asm-generic/pgalloc.h:193 [inline] mm_free_pgd kernel/fork.c:650 [inline] __mmdrop+0x86/0x2ac kernel/fork.c:701 mmdrop include/linux/sched/mm.h:49 [inline] __mmput kernel/fork.c:1124 [inline] mmput+0x2a2/0x2c2 kernel/fork.c:1135 free_bprm+0xbc/0x1de fs/exec.c:1485 kernel_execve+0x214/0x288 fs/exec.c:1982 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 Memory state around the buggy address: ffffaf801c243d00: 00 00 00 00 00 00 00 00 00 00 00 fc 00 00 00 00 ffffaf801c243d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffaf801c243e00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffffaf801c243e80: 00 00 00 00 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 ffffaf801c243f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================