================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800c6a3fd0 by task syz-executor.0/2051 CPU: 0 PID: 2051 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 Allocated by task 0: (stack is not available) Last potentially related work creation: ------------[ cut here ]------------ slab index 1931520 out of bounds (305) for stack id 229d7900 WARNING: CPU: 0 PID: 2051 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2051 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2051 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 : ffffaf800c6a3e90 gp : ffffffff85863ac0 tp : ffffaf800a096100 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800c6a3ea0 s1 : ffffaf807a9c6d00 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000103 a3 : ffffffff8012252a a4 : ec70b9df229d7900 a5 : ec70b9df229d7900 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800c6a3fd0 s3 : ffffaf8007201c80 s4 : ffffaf800c6a3c00 s5 : ffffaf800c6a3e00 s6 : 0000000000003fff s7 : ffffaf800c6a3f70 s8 : ffffaf805a9de970 s9 : ffffffffffffc000 s10: ffffaf800c6a4040 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800c6a3998 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 irq event stamp: 93315 hardirqs last enabled at (93314): [] rmqueue_pcplist mm/page_alloc.c:3671 [inline] hardirqs last enabled at (93314): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last enabled at (93314): [] get_page_from_freelist+0xfc8/0x12d8 mm/page_alloc.c:4162 hardirqs last disabled at (93315): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (93315): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (93222): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (93222): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (93227): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (93227): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (93227): [] __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 (305) for stack id ffffaf80 WARNING: CPU: 0 PID: 2051 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2051 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2051 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 : ffffaf800c6a3e90 gp : ffffffff85863ac0 tp : ffffaf800a096100 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800c6a3ea0 s1 : ffffaf807a9c6d00 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000103 a3 : ffffffff8012252a a4 : ec70b9df229d7900 a5 : ec70b9df229d7900 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800c6a3fd0 s3 : ffffaf8007201c80 s4 : ffffaf800c6a3c00 s5 : ffffaf800c6a3e00 s6 : 0000000000003fff s7 : ffffaf800c6a3f70 s8 : ffffaf805a9de970 s9 : ffffffffffffc000 s10: ffffaf800c6a4040 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800c6a3998 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 irq event stamp: 93315 hardirqs last enabled at (93314): [] rmqueue_pcplist mm/page_alloc.c:3671 [inline] hardirqs last enabled at (93314): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last enabled at (93314): [] get_page_from_freelist+0xfc8/0x12d8 mm/page_alloc.c:4162 hardirqs last disabled at (93315): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (93315): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (93222): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (93222): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (93227): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (93227): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (93227): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800c6a3c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 464 bytes to the right of 512-byte region [ffffaf800c6a3c00, ffffaf800c6a3e00) The buggy address belongs to the page: page:ffffaf807a9c6d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c8a0 head:ffffaf807a9c6d00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 0000000000000000 0000000000000001 ffffaf8007201c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 40180008000, free_ts 40042385800 __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_page_interleave+0x2a/0x1cc mm/mempolicy.c:2116 alloc_pages+0x210/0x2a6 mm/mempolicy.c:2266 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x25a/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_trace+0x2a2/0x2e0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] device_private_init drivers/base/core.c:3249 [inline] device_add+0xce0/0x129e drivers/base/core.c:3299 device_register+0x20/0x2a drivers/base/core.c:3486 tty_register_device_attr+0x27a/0x4bc drivers/tty/tty_io.c:3253 tty_register_device drivers/tty/tty_io.c:3188 [inline] tty_register_driver+0x2ca/0x4b2 drivers/tty/tty_io.c:3453 legacy_pty_init drivers/tty/pty.c:591 [inline] pty_init+0x354/0x7e6 drivers/tty/pty.c:953 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_thread_stack kernel/fork.c:297 [inline] release_task_stack kernel/fork.c:434 [inline] put_task_stack+0x1d0/0x2b0 kernel/fork.c:445 finish_task_switch.isra.0+0x3ce/0x420 kernel/sched/core.c:4898 context_switch kernel/sched/core.c:4989 [inline] __schedule+0x58e/0x118e kernel/sched/core.c:6296 preempt_schedule_irq+0x4a/0x13e kernel/sched/core.c:6711 resume_kernel+0x16/0x18 Memory state around the buggy address: ffffaf800c6a3e80: 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00 ffffaf800c6a3f00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf800c6a3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffffaf800c6a4000: 00 00 00 00 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 ffffaf800c6a4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================