================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x2d90/0x3c40 kernel/locking/lockdep.c:5089 Read of size 8 at addr ffff888027e94180 by task syz.1.27/6174 CPU: 0 UID: 0 PID: 6174 Comm: syz.1.27 Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0 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:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 __lock_acquire+0x2d90/0x3c40 kernel/locking/lockdep.c:5089 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 __wake_up_common_lock kernel/sched/wait.c:105 [inline] __wake_up+0x1c/0x60 kernel/sched/wait.c:127 snd_pcm_action_single+0x10a/0x150 sound/core/pcm_native.c:1295 snd_pcm_action+0x70/0x90 sound/core/pcm_native.c:1376 loopback_check_format sound/drivers/aloop.c:362 [inline] loopback_trigger+0xd5a/0x1e60 sound/drivers/aloop.c:410 snd_pcm_do_start sound/core/pcm_native.c:1437 [inline] snd_pcm_do_start+0xd1/0x1f0 sound/core/pcm_native.c:1430 snd_pcm_action_single+0x7d/0x150 sound/core/pcm_native.c:1293 snd_pcm_action+0x70/0x90 sound/core/pcm_native.c:1376 __snd_pcm_lib_xfer+0x13f5/0x1ea0 sound/core/pcm_lib.c:2405 snd_pcm_oss_write3+0xd5/0x1e0 sound/core/oss/pcm_oss.c:1242 snd_pcm_oss_write2+0x318/0x3f0 sound/core/oss/pcm_oss.c:1382 snd_pcm_oss_sync1+0x1bf/0x510 sound/core/oss/pcm_oss.c:1616 snd_pcm_oss_sync+0x617/0x7f0 sound/core/oss/pcm_oss.c:1692 snd_pcm_oss_release+0x28b/0x310 sound/core/oss/pcm_oss.c:2575 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x27b/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f81579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000ffda252c EFLAGS: 00000202 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 000000000000001e RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 6175: 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:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] snd_pcm_attach_substream+0x414/0xd20 sound/core/pcm.c:940 snd_pcm_open_substream+0x8e/0x17c0 sound/core/pcm_native.c:2739 snd_pcm_oss_open_file sound/core/oss/pcm_oss.c:2439 [inline] snd_pcm_oss_open+0x754/0x1400 sound/core/oss/pcm_oss.c:2520 soundcore_open+0x409/0x580 sound/sound_core.c:594 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0xf59/0x1ea0 fs/open.c:945 vfs_open+0x82/0x3f0 fs/open.c:1075 do_open fs/namei.c:3828 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3987 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_compat_sys_openat fs/open.c:1479 [inline] __se_compat_sys_openat fs/open.c:1477 [inline] __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1477 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 6175: 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:582 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:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 snd_pcm_detach_substream+0x1d0/0x380 sound/core/pcm.c:1005 snd_pcm_release_substream+0x5b/0x70 sound/core/pcm_native.c:2712 snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2398 [inline] snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2390 [inline] snd_pcm_oss_release+0x16f/0x310 sound/core/oss/pcm_oss.c:2577 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x27b/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff888027e94000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 384 bytes inside of freed 2048-byte region [ffff888027e94000, ffff888027e94800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27e90 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801ac42f00 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac42f00 0000000000000000 dead000000000001 head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea00009fa401 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5955, tgid 5955 (syz-executor), ts 98015514588, free_ts 97994974159 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_slowpath mm/page_alloc.c:4288 [inline] __alloc_pages_noprof+0x6a6/0x25b0 mm/page_alloc.c:4766 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_slab_page mm/slub.c:2425 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0xca/0x410 mm/slub.c:2642 ___slab_alloc+0xce2/0x1650 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __kmalloc_cache_node_noprof+0xfb/0x3f0 mm/slub.c:4337 kmalloc_node_noprof include/linux/slab.h:924 [inline] alloc_mem_cgroup_per_node_info mm/memcontrol.c:3441 [inline] mem_cgroup_alloc mm/memcontrol.c:3539 [inline] mem_cgroup_css_alloc+0x9fb/0x1cf0 mm/memcontrol.c:3580 css_create kernel/cgroup/cgroup.c:5631 [inline] cgroup_apply_control_enable+0x4b6/0xc80 kernel/cgroup/cgroup.c:3239 cgroup_mkdir+0x398/0x1150 kernel/cgroup/cgroup.c:5847 kernfs_iop_mkdir+0x14a/0x1d0 fs/kernfs/dir.c:1246 vfs_mkdir+0x57d/0x860 fs/namei.c:4311 do_mkdirat+0x301/0x3a0 fs/namei.c:4334 __do_sys_mkdirat fs/namei.c:4349 [inline] __se_sys_mkdirat fs/namei.c:4347 [inline] __ia32_sys_mkdirat+0x82/0xb0 fs/namei.c:4347 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 page last free pid 6019 tgid 6019 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2659 __put_partials+0x14c/0x170 mm/slub.c:3157 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/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:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_noprof+0x1c8/0x3b0 mm/slub.c:4175 vm_area_alloc+0x1f/0x1c0 kernel/fork.c:472 __mmap_new_vma mm/vma.c:2340 [inline] __mmap_region+0x1091/0x2760 mm/vma.c:2456 mmap_region+0x127/0x320 mm/mmap.c:1348 do_mmap+0xc00/0xfc0 mm/mmap.c:496 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:580 ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:542 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Memory state around the buggy address: ffff888027e94080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027e94100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027e94180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027e94200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027e94280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi