================================================================== 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+0xa4/0xb0 drivers/android/binder.c:6932 Write of size 8 at addr ffff888100796808 by task syz-executor/8473 CPU: 1 UID: 0 PID: 8473 Comm: syz-executor Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xcd/0x680 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 hlist_add_head include/linux/list.h:1026 [inline] binder_add_device+0xa4/0xb0 drivers/android/binder.c:6932 binderfs_binder_device_create.isra.0+0xa03/0xc30 drivers/android/binderfs.c:210 binderfs_fill_super+0x8d4/0x1360 drivers/android/binderfs.c:730 vfs_get_super fs/super.c:1323 [inline] get_tree_nodev+0xda/0x190 fs/super.c:1342 vfs_get_tree+0x8e/0x340 fs/super.c:1802 do_new_mount fs/namespace.c:3856 [inline] path_mount+0x14d4/0x1f70 fs/namespace.c:4180 do_mount fs/namespace.c:4193 [inline] __do_sys_mount fs/namespace.c:4404 [inline] __se_sys_mount fs/namespace.c:4381 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4381 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f96dd9900ca 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:00007ffe7e828258 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f96dda10e74 RCX: 00007f96dd9900ca RDX: 00007f96dda208cb RSI: 00007f96dda10e74 RDI: 00007f96dda208cb RBP: 00007f96dda110bd R08: 0000000000000000 R09: 00007f96ddbb6738 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f96dd9ec1a8 R13: 00007f96dd9ec180 R14: 0000000000000009 R15: 0000000000000000 Allocated by task 5946: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] binderfs_binder_device_create.isra.0+0x189/0xc30 drivers/android/binderfs.c:147 binderfs_fill_super+0x8d4/0x1360 drivers/android/binderfs.c:730 vfs_get_super fs/super.c:1323 [inline] get_tree_nodev+0xda/0x190 fs/super.c:1342 vfs_get_tree+0x8e/0x340 fs/super.c:1802 do_new_mount fs/namespace.c:3856 [inline] path_mount+0x14d4/0x1f70 fs/namespace.c:4180 do_mount fs/namespace.c:4193 [inline] __do_sys_mount fs/namespace.c:4404 [inline] __se_sys_mount fs/namespace.c:4381 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4381 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6087: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2380 [inline] slab_free mm/slub.c:4642 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4841 binder_free_proc drivers/android/binder.c:5248 [inline] binder_proc_dec_tmpref drivers/android/binder.c:1565 [inline] binder_proc_dec_tmpref+0x4c3/0x590 drivers/android/binder.c:1558 binder_deferred_release drivers/android/binder.c:6292 [inline] binder_deferred_func+0xe87/0x12c0 drivers/android/binder.c:6319 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888100796800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff888100796800, ffff888100796a00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888100796800 pfn:0x100794 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 ffff88801b842c80 ffff8881000007c8 ffffea0004179610 raw: ffff888100796800 000000000010000d 00000000f5000000 0000000000000000 head: 057ff00000000240 ffff88801b842c80 ffff8881000007c8 ffffea0004179610 head: ffff888100796800 000000000010000d 00000000f5000000 0000000000000000 head: 057ff00000000002 ffffea000401e501 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5936, tgid 5936 (syz-executor), ts 48513604194, free_ts 17844673158 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_slab_page mm/slub.c:2452 [inline] allocate_slab mm/slub.c:2618 [inline] new_slab+0x94/0x330 mm/slub.c:2672 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3858 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948 __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] __kmalloc_cache_node_noprof+0x100/0x420 mm/slub.c:4366 kmalloc_node_noprof include/linux/slab.h:928 [inline] alloc_fair_sched_group+0x20f/0x440 kernel/sched/fair.c:13392 sched_create_group+0x2d/0x80 kernel/sched/core.c:8982 cpu_cgroup_css_alloc kernel/sched/core.c:9128 [inline] cpu_cgroup_css_alloc+0x15/0x30 kernel/sched/core.c:9118 css_create kernel/cgroup/cgroup.c:5664 [inline] cgroup_apply_control_enable+0x4b0/0xbb0 kernel/cgroup/cgroup.c:3284 cgroup_mkdir+0x5e7/0x11f0 kernel/cgroup/cgroup.c:5888 kernfs_iop_mkdir+0x111/0x190 fs/kernfs/dir.c:1268 vfs_mkdir+0x593/0x8c0 fs/namei.c:4366 do_mkdirat+0x304/0x3e0 fs/namei.c:4399 __do_sys_mkdirat fs/namei.c:4416 [inline] __se_sys_mkdirat fs/namei.c:4414 [inline] __x64_sys_mkdirat+0x83/0xb0 fs/namei.c:4414 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4203 __kernfs_new_node+0xd2/0x8e0 fs/kernfs/dir.c:637 kernfs_new_node+0x13c/0x1e0 fs/kernfs/dir.c:713 kernfs_create_dir_ns+0x4c/0x1a0 fs/kernfs/dir.c:1083 internal_create_group+0x34d/0xf30 fs/sysfs/group.c:170 kernel_add_sysfs_param kernel/params.c:813 [inline] param_sysfs_builtin kernel/params.c:850 [inline] param_sysfs_builtin_init+0x343/0x4c0 kernel/params.c:986 do_one_initcall+0x120/0x6e0 init/main.c:1273 do_initcall_level init/main.c:1335 [inline] do_initcalls init/main.c:1351 [inline] do_basic_setup init/main.c:1370 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1583 kernel_init+0x1c/0x2b0 init/main.c:1473 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888100796700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888100796780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888100796800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888100796880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888100796900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================