================================================================== 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+0xf4/0xf8 drivers/android/binder.c:6932 Write of size 8 at addr 05f0000013238208 by task syz-executor/3301 Pointer tag: [05], memory tag: [89] CPU: 0 UID: 0 PID: 3301 Comm: syz-executor Not tainted 6.14.0-rc2-syzkaller-g29281a76709c #0 Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xac/0x290 mm/kasan/report.c:378 print_report+0x84/0xa0 mm/kasan/report.c:489 kasan_report+0xb0/0x110 mm/kasan/report.c:602 kasan_tag_mismatch+0x28/0x3c mm/kasan/sw_tags.c:175 __hwasan_tag_mismatch+0x30/0x60 arch/arm64/lib/kasan_sw_tags.S:55 hlist_add_head include/linux/list.h:1026 [inline] binder_add_device+0xf4/0xf8 drivers/android/binder.c:6932 binderfs_binder_device_create+0xbfc/0xc28 drivers/android/binderfs.c:210 binderfs_fill_super+0xb30/0xe20 drivers/android/binderfs.c:729 vfs_get_super fs/super.c:1280 [inline] get_tree_nodev+0xdc/0x1cc fs/super.c:1299 binderfs_fs_context_get_tree+0x28/0x38 drivers/android/binderfs.c:749 vfs_get_tree+0xc4/0x3cc fs/super.c:1814 do_new_mount+0x2a0/0x988 fs/namespace.c:3560 path_mount+0x650/0x101c fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount fs/namespace.c:4088 [inline] __arm64_sys_mount+0x36c/0x468 fs/namespace.c:4088 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x90/0x2b4 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x180/0x2f4 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x58/0x74 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x134 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Allocated by task 3291: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 save_stack_info+0x30/0x138 mm/kasan/tags.c:106 kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:142 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x8c/0x90 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x2a0/0x404 mm/slub.c:4325 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] binderfs_binder_device_create+0x1ac/0xc28 drivers/android/binderfs.c:147 binderfs_fill_super+0xb30/0xe20 drivers/android/binderfs.c:729 vfs_get_super fs/super.c:1280 [inline] get_tree_nodev+0xdc/0x1cc fs/super.c:1299 binderfs_fs_context_get_tree+0x28/0x38 drivers/android/binderfs.c:749 vfs_get_tree+0xc4/0x3cc fs/super.c:1814 do_new_mount+0x2a0/0x988 fs/namespace.c:3560 path_mount+0x650/0x101c fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount fs/namespace.c:4088 [inline] __arm64_sys_mount+0x36c/0x468 fs/namespace.c:4088 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x90/0x2b4 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x180/0x2f4 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x58/0x74 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x134 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 3291: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 save_stack_info+0x30/0x138 mm/kasan/tags.c:106 kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:147 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x68 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+0x148/0x44c mm/slub.c:4757 binderfs_evict_inode+0x1e8/0x2b8 drivers/android/binderfs.c:278 evict+0x4d4/0xbe8 fs/inode.c:796 iput_final fs/inode.c:1946 [inline] iput+0x928/0x9e0 fs/inode.c:1972 dentry_unlink_inode+0x624/0x660 fs/dcache.c:440 __dentry_kill+0x224/0x808 fs/dcache.c:643 shrink_kill+0xd4/0x2cc fs/dcache.c:1088 shrink_dentry_list+0x420/0x970 fs/dcache.c:1115 shrink_dcache_parent+0x80/0x200 fs/dcache.c:-1 do_one_tree+0x2c/0x148 fs/dcache.c:1578 shrink_dcache_for_umount+0xb0/0x198 fs/dcache.c:1595 generic_shutdown_super+0x84/0x424 fs/super.c:620 kill_anon_super fs/super.c:1237 [inline] kill_litter_super+0xa4/0xdc fs/super.c:1247 binderfs_kill_super+0x50/0xcc drivers/android/binderfs.c:791 deactivate_locked_super+0xf0/0x17c fs/super.c:473 deactivate_super+0xf4/0x104 fs/super.c:506 cleanup_mnt+0x3fc/0x484 fs/namespace.c:1413 __cleanup_mnt+0x20/0x30 fs/namespace.c:1420 task_work_run+0x1bc/0x254 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x740/0x23b0 kernel/exit.c:938 do_group_exit+0x1d4/0x2ac kernel/exit.c:1087 get_signal+0x1440/0x1554 kernel/signal.c:3036 do_signal+0x23c/0x3ecc arch/arm64/kernel/signal.c:1658 do_notify_resume+0x78/0x27c arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xb0/0x134 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at fff0000013238200 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 288-byte region [fff0000013238200, fff0000013238320) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x53238 anon flags: 0x1ffc00000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) page_type: f5(slab) raw: 01ffc00000000000 a7f000000c801900 ffffc1ffc04c7a00 0000000000000005 raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff0000013238000: 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 fff0000013238100: 38 38 38 38 fe fe fe fe fe fe fe fe fe fe fe fe >fff0000013238200: 89 89 89 89 89 89 89 89 89 89 89 89 89 89 89 89 ^ fff0000013238300: 89 89 fe fe fe fe fe fe fe fe fe fe fe fe fe fe fff0000013238400: 36 36 36 36 36 36 36 36 36 36 36 36 36 36 36 36 ==================================================================