================================================================== BUG: KASAN: slab-out-of-bounds in copy_array+0x8a/0xe8 kernel/bpf/verifier.c:1072 Write of size 80 at addr ff6000002d6bfa80 by task syz-executor.0/6699 CPU: 1 PID: 6699 Comm: syz-executor.0 Tainted: G W 6.2.0-rc1-syzkaller #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:121 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:127 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe0/0x14c lib/dump_stack.c:106 [] print_address_description mm/kasan/report.c:306 [inline] [] print_report+0x1e4/0x4c0 mm/kasan/report.c:417 [] kasan_report+0xb8/0xe6 mm/kasan/report.c:517 [] check_region_inline mm/kasan/generic.c:173 [inline] [] kasan_check_range+0x32/0x148 mm/kasan/generic.c:189 [] memcpy+0x32/0x64 mm/kasan/shadow.c:66 [] copy_array+0x8a/0xe8 kernel/bpf/verifier.c:1072 [] copy_verifier_state+0x6c/0x462 kernel/bpf/verifier.c:1250 [] pop_stack kernel/bpf/verifier.c:1314 [inline] [] do_check kernel/bpf/verifier.c:14031 [inline] [] do_check_common+0x397a/0x6608 kernel/bpf/verifier.c:16289 [] do_check_main kernel/bpf/verifier.c:16352 [inline] [] bpf_check+0x45b2/0x5a5a kernel/bpf/verifier.c:16936 [] bpf_prog_load+0xc90/0x12b0 kernel/bpf/syscall.c:2619 [] __sys_bpf+0x622/0x31d2 kernel/bpf/syscall.c:4979 [] __do_sys_bpf kernel/bpf/syscall.c:5083 [inline] [] sys_bpf+0x28/0x36 kernel/bpf/syscall.c:5081 [] ret_from_syscall+0x0/0x2 Allocated by task 6699: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x5a mm/kasan/common.c:45 kasan_set_track+0x1a/0x26 mm/kasan/common.c:52 kasan_save_alloc_info+0x1a/0x24 mm/kasan/generic.c:507 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_krealloc+0xfa/0x11a mm/kasan/common.c:439 kasan_krealloc include/linux/kasan.h:231 [inline] __do_krealloc mm/slab_common.c:1361 [inline] krealloc+0x82/0xae mm/slab_common.c:1398 push_jmp_history+0xd2/0x140 kernel/bpf/verifier.c:2592 is_state_visited kernel/bpf/verifier.c:13552 [inline] do_check kernel/bpf/verifier.c:13752 [inline] do_check_common+0x47be/0x6608 kernel/bpf/verifier.c:16289 do_check_main kernel/bpf/verifier.c:16352 [inline] bpf_check+0x45b2/0x5a5a kernel/bpf/verifier.c:16936 bpf_prog_load+0xc90/0x12b0 kernel/bpf/syscall.c:2619 __sys_bpf+0x622/0x31d2 kernel/bpf/syscall.c:4979 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline] sys_bpf+0x28/0x36 kernel/bpf/syscall.c:5081 ret_from_syscall+0x0/0x2 The buggy address belongs to the object at ff6000002d6bfa80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ff6000002d6bfa80, ff6000002d6bfae0) The buggy address belongs to the physical page: page:ff1c000002b62fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xad8bf anon flags: 0xffe000000000200(slab|node=0|zone=0|lastcpupid=0x7ff) raw: 0ffe000000000200 ff60000008201780 ff1c000002410080 0000000000000005 raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 2898, tgid 2898 (syz-executor.1), ts 3620989490700, free_ts 3618727218800 __set_page_owner+0x32/0x182 mm/page_owner.c:190 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xf8/0x11a mm/page_alloc.c:2524 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0xc0e/0x1118 mm/page_alloc.c:4283 __alloc_pages+0x1b0/0x165a mm/page_alloc.c:5549 alloc_pages+0x132/0x25e mm/mempolicy.c:2286 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab mm/slub.c:1998 [inline] new_slab+0x270/0x382 mm/slub.c:2051 ___slab_alloc+0x57e/0xaa6 mm/slub.c:3193 __slab_alloc.constprop.0+0x5a/0x98 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0xf2/0x2e4 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc+0x34/0xe2 mm/slab_common.c:981 kmalloc_array include/linux/slab.h:636 [inline] kcalloc include/linux/slab.h:667 [inline] ext4_find_extent+0x73c/0x7d4 fs/ext4/extents.c:914 ext4_ext_map_blocks+0x20e/0x3f90 fs/ext4/extents.c:4102 ext4_map_blocks+0x81c/0xf10 fs/ext4/inode.c:576 ext4_append+0x12c/0x338 fs/ext4/namei.c:75 ext4_init_new_dir+0x1a8/0x32e fs/ext4/namei.c:2956 ext4_mkdir+0x300/0x6f4 fs/ext4/namei.c:3002 page last free stack trace: __reset_page_owner+0x4a/0xf8 mm/page_owner.c:148 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x254/0x48e mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x60/0x2ae mm/page_alloc.c:3464 free_the_page mm/page_alloc.c:750 [inline] __free_pages+0xd6/0x106 mm/page_alloc.c:5635 __vunmap+0x85a/0xa34 mm/vmalloc.c:2727 free_work+0x44/0x5a mm/vmalloc.c:100 process_one_work+0x660/0x102e kernel/workqueue.c:2289 worker_thread+0x362/0x878 kernel/workqueue.c:2436 kthread+0x19c/0x1f8 kernel/kthread.c:376 ret_from_exception+0x0/0x1a arch/riscv/kernel/entry.S:249 Memory state around the buggy address: ff6000002d6bf980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ff6000002d6bfa00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ff6000002d6bfa80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ff6000002d6bfb00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ff6000002d6bfb80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== warn_alloc: 1 callbacks suppressed syz-executor.0: vmalloc error: size 4096, vm_struct allocation failed, mode:0xcc0(GFP_KERNEL), nodemask=(null),cpuset=syz0,mems_allowed=0 CPU: 1 PID: 6699 Comm: syz-executor.0 Tainted: G B W 6.2.0-rc1-syzkaller #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:121 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:127 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe0/0x14c lib/dump_stack.c:106 [] dump_stack+0x1c/0x24 lib/dump_stack.c:113 [] warn_alloc+0x168/0x22c mm/page_alloc.c:4356 [] __vmalloc_node_range+0xb6c/0xdb4 mm/vmalloc.c:3192 [] bpf_jit_alloc_exec+0x46/0x52 arch/riscv/net/bpf_jit_core.c:190 [] bpf_jit_binary_alloc+0x96/0x13c kernel/bpf/core.c:1025 [] bpf_int_jit_compile+0x886/0xaa6 arch/riscv/net/bpf_jit_core.c:112 [] bpf_prog_select_runtime+0x1a2/0x22e kernel/bpf/core.c:2190 [] bpf_prog_load+0xcb4/0x12b0 kernel/bpf/syscall.c:2623 [] __sys_bpf+0x622/0x31d2 kernel/bpf/syscall.c:4979 [] __do_sys_bpf kernel/bpf/syscall.c:5083 [inline] [] sys_bpf+0x28/0x36 kernel/bpf/syscall.c:5081 [] ret_from_syscall+0x0/0x2 Mem-Info: active_anon:41215 inactive_anon:117 isolated_anon:0 active_file:0 inactive_file:8086 isolated_file:0 unevictable:768 dirty:0 writeback:0 slab_reclaimable:5740 slab_unreclaimable:24282 mapped:8783 shmem:3978 pagetables:341 sec_pagetables:0 bounce:0 kernel_misc_reclaimable:0 free:215209 free_pcp:990 free_cma:4096 Node 0 active_anon:164860kB inactive_anon:468kB active_file:0kB inactive_file:32344kB unevictable:3072kB isolated(anon):0kB isolated(file):0kB mapped:35132kB dirty:0kB writeback:0kB shmem:15912kB writeback_tmp:0kB kernel_stack:5400kB pagetables:1364kB sec_pagetables:0kB all_unreclaimable? no Node 0 DMA32 free:860836kB boost:0kB min:4656kB low:6012kB high:7368kB reserved_highatomic:0KB active_anon:164860kB inactive_anon:468kB active_file:0kB inactive_file:32344kB unevictable:3072kB writepending:0kB present:2095104kB managed:1359004kB mlocked:0kB bounce:0kB free_pcp:3924kB local_pcp:2412kB free_cma:16384kB lowmem_reserve[]: 0 0 0 Node 0 DMA32: 2247*4kB (ME) 2255*8kB (UME) 819*16kB (UM) 399*32kB (UM) 220*64kB (UM) 166*128kB (UME) 78*256kB (UM) 24*512kB (UM) 11*1024kB (M) 10*2048kB (UMC) 173*4096kB (UMC) = 860836kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 0 hugepages_total=4 hugepages_free=4 hugepages_surp=0 hugepages_size=2048kB 12014 total pagecache pages 0 pages in swap cache Free swap = 0kB Total swap = 0kB 523776 pages RAM 0 pages HighMem/MovableOnly 184025 pages reserved 4096 pages cma reserved