================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800c74bf70 by task syz-executor.1/2051 CPU: 0 PID: 2051 Comm: syz-executor.1 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 Allocated by task 208977472: (stack is not available) Last potentially related work creation: ------------[ cut here ]------------ slab index 1358848 out of bounds (285) for stack id 0c74bc00 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.1 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 : ffffaf800c74be30 gp : ffffffff85863ac0 tp : ffffaf800de33080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800c74be40 s1 : ffffaf807a9c9c40 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 6a86b1dd255fad00 a5 : 6a86b1dd255fad00 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800c74bf70 s3 : ffffaf8007201c80 s4 : ffffaf800c74bc00 s5 : ffffaf800c74be00 s6 : 0000000000003fff s7 : ffffaf800c74bf10 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf800c74bfe0 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800c74b938 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 irq event stamp: 33091 hardirqs last enabled at (33090): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (33090): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (33091): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (33091): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (32990): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (32990): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (32997): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (32997): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (32997): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800c74bc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 368 bytes to the right of 512-byte region [ffffaf800c74bc00, ffffaf800c74be00) The buggy address belongs to the page: page:ffffaf807a9c9c40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c948 head:ffffaf807a9c9c40 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 501, ts 38395887300, free_ts 38394521100 __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+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] alloc_bprm+0x48/0x4b6 fs/exec.c:1507 kernel_execve+0x54/0x288 fs/exec.c:1947 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 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 schedule_tail+0xe/0xc8 kernel/sched/core.c:4922 ret_from_kernel_thread+0x4/0x10 arch/riscv/kernel/entry.S:494 Memory state around the buggy address: ffffaf800c74be00: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ffffaf800c74be80: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc >ffffaf800c74bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffffaf800c74bf80: fc fc fc fc fc fc fc fc f1 f1 f1 f1 00 00 00 f3 ffffaf800c74c000: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================