================================================================== BUG: KASAN: slab-out-of-bounds in copy_array kernel/bpf/verifier.c:1072 [inline] BUG: KASAN: slab-out-of-bounds in copy_verifier_state+0x130/0xbe0 kernel/bpf/verifier.c:1250 Write of size 104 at addr ffff888027874100 by task syz-executor.1/9881 CPU: 0 PID: 9881 Comm: syz-executor.1 Not tainted 6.1.0-syzkaller-10971-g041fae9c105a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x220 mm/kasan/report.c:417 kasan_report+0x139/0x170 mm/kasan/report.c:517 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 copy_array kernel/bpf/verifier.c:1072 [inline] copy_verifier_state+0x130/0xbe0 kernel/bpf/verifier.c:1250 pop_stack kernel/bpf/verifier.c:1314 [inline] do_check+0x8e51/0x107b0 kernel/bpf/verifier.c:14031 do_check_common+0x909/0x1800 kernel/bpf/verifier.c:16289 do_check_main kernel/bpf/verifier.c:16352 [inline] bpf_check+0x107e2/0x16170 kernel/bpf/verifier.c:16936 bpf_prog_load+0x1306/0x1be0 kernel/bpf/syscall.c:2619 __sys_bpf+0x396/0x6d0 kernel/bpf/syscall.c:4979 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline] __se_sys_bpf kernel/bpf/syscall.c:5081 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5081 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa09508c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa095d82168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fa0951ac120 RCX: 00007fa09508c0d9 RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005 RBP: 00007fa0950e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec7bc1c4f R14: 00007fa095d82300 R15: 0000000000022000 Allocated by task 9881: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_krealloc+0xbf/0xf0 mm/kasan/common.c:439 kasan_krealloc include/linux/kasan.h:231 [inline] __do_krealloc mm/slab_common.c:1361 [inline] krealloc+0xb2/0x110 mm/slab_common.c:1398 push_jmp_history kernel/bpf/verifier.c:2592 [inline] is_state_visited kernel/bpf/verifier.c:13552 [inline] do_check+0x9433/0x107b0 kernel/bpf/verifier.c:13752 do_check_common+0x909/0x1800 kernel/bpf/verifier.c:16289 do_check_main kernel/bpf/verifier.c:16352 [inline] bpf_check+0x107e2/0x16170 kernel/bpf/verifier.c:16936 bpf_prog_load+0x1306/0x1be0 kernel/bpf/syscall.c:2619 __sys_bpf+0x396/0x6d0 kernel/bpf/syscall.c:4979 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline] __se_sys_bpf kernel/bpf/syscall.c:5081 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5081 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488 kvfree_call_rcu+0x118/0x8c0 kernel/rcu/tree.c:3374 kernfs_unlink_open_file+0x421/0x4d0 fs/kernfs/file.c:629 kernfs_fop_release+0x2e3/0x430 fs/kernfs/file.c:801 __fput+0x3ba/0x880 fs/file_table.c:320 task_work_run+0x243/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488 kvfree_call_rcu+0x118/0x8c0 kernel/rcu/tree.c:3374 kernfs_unlink_open_file+0x421/0x4d0 fs/kernfs/file.c:629 kernfs_fop_release+0x2e3/0x430 fs/kernfs/file.c:801 __fput+0x3ba/0x880 fs/file_table.c:320 task_work_run+0x243/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888027874100 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff888027874100, ffff888027874180) The buggy address belongs to the physical page: page:ffffea00009e1d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27874 anon flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff8880128418c0 ffffea00016a3d00 dead000000000005 raw: 0000000000000000 0000000080100010 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4429, tgid 4429 (udevd), ts 124600814651, free_ts 124599484861 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0xbd/0x190 mm/slub.c:1851 allocate_slab+0x5e/0x3c0 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x25b/0x340 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] kernfs_get_open_node fs/kernfs/file.c:568 [inline] kernfs_fop_open+0x7fc/0xc80 fs/kernfs/file.c:736 do_dentry_open+0x85f/0x11b0 fs/open.c:882 do_open fs/namei.c:3557 [inline] path_openat+0x25cc/0x2de0 fs/namei.c:3714 do_filp_open+0x275/0x500 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464 discard_slab mm/slub.c:2098 [inline] __unfreeze_partials+0x1a5/0x1e0 mm/slub.c:2637 put_cpu_partial+0x116/0x180 mm/slub.c:2713 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x1b3/0x350 mm/slub.c:3476 getname_flags+0xb8/0x4e0 fs/namei.c:139 user_path_at_empty+0x2a/0x1a0 fs/namei.c:2875 do_readlinkat+0x11b/0x3b0 fs/stat.c:471 __do_sys_readlink fs/stat.c:504 [inline] __se_sys_readlink fs/stat.c:501 [inline] __x64_sys_readlink+0x7b/0x90 fs/stat.c:501 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888027874000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027874080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888027874100: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888027874180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027874200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================