================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf801dbc7ac0 by task syz-executor.0/2284 CPU: 0 PID: 2284 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 [] __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 Allocated by task 498890736: (stack is not available) Freed by task 2269: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track+0x1a/0x26 mm/kasan/common.c:45 kasan_set_free_info+0x1e/0x3a mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x15e/0x180 mm/kasan/common.c:328 __kasan_slab_free+0x10/0x18 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8e/0x1cc mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kmem_cache_free+0xca/0x482 mm/slub.c:3526 putname+0xd8/0xe4 fs/namei.c:270 kernel_execve+0x222/0x288 fs/exec.c:1984 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 Last potentially related work creation: ------------[ cut here ]------------ slab index 1176524 out of bounds (318) for stack id 8011f3cc WARNING: CPU: 0 PID: 2284 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2284 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2284 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 : ffffaf801dbc7980 gp : ffffffff85863ac0 tp : ffffaf801ded3080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf801dbc7990 s1 : ffffaf807aea5e00 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000505 a3 : ffffffff8012252a a4 : f32a4debf1d76700 a5 : f32a4debf1d76700 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf801dbc7ac0 s3 : ffffaf80072e9b40 s4 : ffffaf801dbc6600 s5 : ffffaf801dbc7600 s6 : 0000000000003fff s7 : ffffaf801dbc7a60 s8 : ffffaf805a9de970 s9 : ffffffffffffc000 s10: ffffaf801dbc7b40 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf801dbc7478 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 [] __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 irq event stamp: 54239 hardirqs last enabled at (54238): [] rmqueue_pcplist mm/page_alloc.c:3671 [inline] hardirqs last enabled at (54238): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last enabled at (54238): [] get_page_from_freelist+0xfc8/0x12d8 mm/page_alloc.c:4162 hardirqs last disabled at (54239): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (54239): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (54066): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (54066): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (54075): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (54075): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (54075): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- Second to last potentially related work creation: ------------[ cut here ]------------ slab index 2097151 out of bounds (318) for stack id ffffffff WARNING: CPU: 0 PID: 2284 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2284 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2284 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 : ffffaf801dbc7980 gp : ffffffff85863ac0 tp : ffffaf801ded3080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf801dbc7990 s1 : ffffaf807aea5e00 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000505 a3 : ffffffff8012252a a4 : f32a4debf1d76700 a5 : f32a4debf1d76700 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf801dbc7ac0 s3 : ffffaf80072e9b40 s4 : ffffaf801dbc6600 s5 : ffffaf801dbc7600 s6 : 0000000000003fff s7 : ffffaf801dbc7a60 s8 : ffffaf805a9de970 s9 : ffffffffffffc000 s10: ffffaf801dbc7b40 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf801dbc7478 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 [] __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 irq event stamp: 54239 hardirqs last enabled at (54238): [] rmqueue_pcplist mm/page_alloc.c:3671 [inline] hardirqs last enabled at (54238): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last enabled at (54238): [] get_page_from_freelist+0xfc8/0x12d8 mm/page_alloc.c:4162 hardirqs last disabled at (54239): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (54239): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (54066): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (54066): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (54075): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (54075): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (54075): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf801dbc6600 which belongs to the cache names_cache of size 4096 The buggy address is located 1216 bytes to the right of 4096-byte region [ffffaf801dbc6600, ffffaf801dbc7600) The buggy address belongs to the page: page:ffffaf807aea5e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9ddc0 head:ffffaf807aea5e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x9800010200(slab|head|section=19|node=0|zone=0) raw: 0000009800010200 0000000000000000 0000000000000122 ffffaf80072e9b40 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2247, ts 783287145100, free_ts 776594362000 __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+0x39c/0x3de mm/slub.c:3243 getname_flags.part.0+0x48/0x2a4 fs/namei.c:138 getname_flags+0x66/0x9c include/linux/audit.h:323 user_path_at_empty+0x2e/0x5a fs/namei.c:2850 user_path_at include/linux/namei.h:57 [inline] __do_sys_chdir fs/open.c:490 [inline] sys_chdir+0xa6/0x1ce fs/open.c:484 ret_from_syscall+0x0/0x2 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 __vunmap+0x67e/0x8c4 mm/vmalloc.c:2635 __vfree+0x70/0x104 mm/vmalloc.c:2683 vfree+0x9a/0xdc mm/vmalloc.c:2714 kcov_put kernel/kcov.c:411 [inline] kcov_put kernel/kcov.c:407 [inline] kcov_close+0x44/0x72 kernel/kcov.c:513 __fput+0x164/0x502 fs/file_table.c:311 ____fput+0x1a/0x24 fs/file_table.c:344 task_work_run+0xdc/0x154 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x7cc/0x18fc kernel/exit.c:806 do_group_exit+0x90/0x17e kernel/exit.c:935 __do_sys_exit_group kernel/exit.c:946 [inline] __wake_up_parent+0x0/0x4a kernel/exit.c:944 ret_from_syscall+0x0/0x2 Memory state around the buggy address: ffffaf801dbc7980: 00 00 00 00 fc fc fc fc 00 00 00 00 00 00 00 00 ffffaf801dbc7a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf801dbc7a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffffaf801dbc7b00: fc fc fc fc f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 ffffaf801dbc7b80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ==================================================================