The problem began to appear after:
commit 12d909cac1e1c4147cc3417fee804ee12fc6b984
Author: Li Li <dualli@xxxxxxxxxx>
Date: Wed Dec 18 13:29:34 2024 -0800
binderfs: add new binder devices to binder_devices
On Thu, Jan 16, 2025 at 12:09 PM syzbot
<syzbot+7015dcf45953112c8b45@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: b323d8e7bc03 Add linux-next specific files for 20250116
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=139dc9df980000
> kernel config: https://syzkaller.appspot.com/x/.config?x=76ebc49148908d34
> dashboard link: https://syzkaller.appspot.com/bug?extid=7015dcf45953112c8b45
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/a529f1184b45/disk-b323d8e7.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/08db885c938e/vmlinux-b323d8e7.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2ff92778e2b7/bzImage-b323d8e7.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+7015dcf45953112c8b45@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> ==================================================================
> BUG: KASAN: slab-use-after-free in hlist_add_head include/linux/list.h:1026 [inline]
> BUG: KASAN: slab-use-after-free in binder_add_device+0x5f/0xa0 drivers/android/binder.c:6932
> Write of size 8 at addr ffff888141fb9408 by task syz-executor/6310
>
> CPU: 0 UID: 0 PID: 6310 Comm: syz-executor Not tainted 6.13.0-rc7-next-20250116-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:94 [inline]
> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
> print_address_description mm/kasan/report.c:378 [inline]
> print_report+0x169/0x550 mm/kasan/report.c:489
> kasan_report+0x143/0x180 mm/kasan/report.c:602
> hlist_add_head include/linux/list.h:1026 [inline]
> binder_add_device+0x5f/0xa0 drivers/android/binder.c:6932
> binderfs_binder_device_create+0x7bf/0x9c0 drivers/android/binderfs.c:210
> binderfs_fill_super+0x944/0xd90 drivers/android/binderfs.c:729
> vfs_get_super fs/super.c:1280 [inline]
> get_tree_nodev+0xb7/0x140 fs/super.c:1299
> vfs_get_tree+0x90/0x2b0 fs/super.c:1814
> do_new_mount+0x2be/0xb40 fs/namespace.c:3560
> do_mount fs/namespace.c:3900 [inline]
> __do_sys_mount fs/namespace.c:4111 [inline]
> __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f909d3874ca
> Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffe0c3c1d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
> RAX: ffffffffffffffda RBX: 00007f909d401ecb RCX: 00007f909d3874ca
> RDX: 00007f909d40ec27 RSI: 00007f909d401ecb RDI: 00007f909d40ec27
> RBP: 00007f909d4020c3 R08: 0000000000000000 R09: 00000000000001ff
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f909d3e41c8
> R13: 00007f909d3e41a8 R14: 0000000000000009 R15: 0000000000000000
> </TASK>
>
> Allocated by task 5832:
> kasan_save_stack mm/kasan/common.c:47 [inline]
> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
> __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
> kasan_kmalloc include/linux/kasan.h:260 [inline]
> __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4325
> kmalloc_noprof include/linux/slab.h:901 [inline]
> kzalloc_noprof include/linux/slab.h:1037 [inline]
> binderfs_binder_device_create+0x16c/0x9c0 drivers/android/binderfs.c:147
> binderfs_fill_super+0x944/0xd90 drivers/android/binderfs.c:729
> vfs_get_super fs/super.c:1280 [inline]
> get_tree_nodev+0xb7/0x140 fs/super.c:1299
> vfs_get_tree+0x90/0x2b0 fs/super.c:1814
> do_new_mount+0x2be/0xb40 fs/namespace.c:3560
> do_mount fs/namespace.c:3900 [inline]
> __do_sys_mount fs/namespace.c:4111 [inline]
> __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Freed by task 5832:
> kasan_save_stack mm/kasan/common.c:47 [inline]
> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
> poison_slab_object mm/kasan/common.c:247 [inline]
> __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
> kasan_slab_free include/linux/kasan.h:233 [inline]
> slab_free_hook mm/slub.c:2353 [inline]
> slab_free mm/slub.c:4609 [inline]
> kfree+0x196/0x430 mm/slub.c:4757
> evict+0x4e8/0x9a0 fs/inode.c:796
> __dentry_kill+0x20d/0x630 fs/dcache.c:625
> shrink_kill+0xa9/0x2c0 fs/dcache.c:1070
> shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1097
> shrink_dcache_parent+0xcb/0x3b0
> do_one_tree+0x23/0xe0 fs/dcache.c:1560
> shrink_dcache_for_umount+0xb4/0x180 fs/dcache.c:1577
> generic_shutdown_super+0x6a/0x2d0 fs/super.c:620
> kill_anon_super fs/super.c:1237 [inline]
> kill_litter_super+0x76/0xb0 fs/super.c:1247
> binderfs_kill_super+0x44/0x90 drivers/android/binderfs.c:791
> deactivate_locked_super+0xc4/0x130 fs/super.c:473
> cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1413
> task_work_run+0x24f/0x310 kernel/task_work.c:227
> exit_task_work include/linux/task_work.h:40 [inline]
> do_exit+0xa2a/0x28e0 kernel/exit.c:938
> do_group_exit+0x207/0x2c0 kernel/exit.c:1087
> get_signal+0x16b2/0x1750 kernel/signal.c:3036
> arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
> exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
> exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
> __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
> syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
> do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> The buggy address belongs to the object at ffff888141fb9400
> which belongs to the cache kmalloc-512 of size 512
> The buggy address is located 8 bytes inside of
> freed 512-byte region [ffff888141fb9400, ffff888141fb9600)
>
> The buggy address belongs to the physical page:
> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888141fba800 pfn:0x141fb8
> head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
> flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
> page_type: f5(slab)
> raw: 057ff00000000240 ffff88801ac41c80 ffffea0005337a10 ffffea0005345c10
> raw: ffff888141fba800 000000000010000f 00000000f5000000 0000000000000000
> head: 057ff00000000240 ffff88801ac41c80 ffffea0005337a10 ffffea0005345c10
> head: ffff888141fba800 000000000010000f 00000000f5000000 0000000000000000
> head: 057ff00000000002 ffffea000507ee01 ffffffffffffffff 0000000000000000
> head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
> 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, tgid 1 (swapper/0), ts 6801495950, free_ts 0
> set_page_owner include/linux/page_owner.h:32 [inline]
> post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
> prep_new_page mm/page_alloc.c:1559 [inline]
> get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477
> __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739
> alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
> alloc_slab_page mm/slub.c:2423 [inline]
> allocate_slab+0x8f/0x3a0 mm/slub.c:2587
> new_slab mm/slub.c:2640 [inline]
> ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826
> __slab_alloc+0x58/0xa0 mm/slub.c:3916
> __slab_alloc_node mm/slub.c:3991 [inline]
> slab_alloc_node mm/slub.c:4152 [inline]
> __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4320
> kmalloc_noprof include/linux/slab.h:901 [inline]
> kzalloc_noprof include/linux/slab.h:1037 [inline]
> device_private_init drivers/base/core.c:3510 [inline]
> device_add+0xc1/0xbf0 drivers/base/core.c:3561
> device_create_groups_vargs drivers/base/core.c:4347 [inline]
> device_create+0x257/0x2e0 drivers/base/core.c:4386
> bdi_register_va+0x8b/0x760 mm/backing-dev.c:1094
> bdi_register+0xd5/0x120 mm/backing-dev.c:1126
> add_disk_fwnode+0x759/0xfc0 block/genhd.c:510
> add_disk include/linux/blkdev.h:759 [inline]
> brd_alloc+0x547/0x790 drivers/block/brd.c:401
> brd_init+0x126/0x1b0 drivers/block/brd.c:481
> do_one_initcall+0x248/0x870 init/main.c:1257
> page_owner free stack trace missing
>
> Memory state around the buggy address:
> ffff888141fb9300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff888141fb9380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >ffff888141fb9400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff888141fb9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff888141fb9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
>
> ---
> This report is generated by a bot. It may contain errors.
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> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
>
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>
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