================================================================== BUG: KASAN: slab-use-after-free in __do_sys_io_cancel fs/aio.c:2207 [inline] BUG: KASAN: slab-use-after-free in __se_sys_io_cancel fs/aio.c:2174 [inline] BUG: KASAN: slab-use-after-free in __ia32_sys_io_cancel+0x40d/0x4a0 fs/aio.c:2174 Read of size 4 at addr ffff8880490e6020 by task syz-executor.3/5901 CPU: 3 PID: 5901 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 __do_sys_io_cancel fs/aio.c:2207 [inline] __se_sys_io_cancel fs/aio.c:2174 [inline] __ia32_sys_io_cancel+0x40d/0x4a0 fs/aio.c:2174 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 RIP: 0023:0xf731a579 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:00000000f5f145ac EFLAGS: 00000292 ORIG_RAX: 00000000000000f9 RAX: ffffffffffffffda RBX: 00000000f7479000 RCX: 00000000200000c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 5901: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x136/0x320 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x123/0x1df0 fs/aio.c:2050 __do_compat_sys_io_submit fs/aio.c:2155 [inline] __se_compat_sys_io_submit fs/aio.c:2125 [inline] __ia32_compat_sys_io_submit+0x1d4/0x3c0 fs/aio.c:2125 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 Freed by task 1268: 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:589 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kmem_cache_free+0x129/0x360 mm/slub.c:4363 iocb_destroy fs/aio.c:1112 [inline] iocb_put fs/aio.c:1212 [inline] iocb_put fs/aio.c:1208 [inline] aio_poll_complete_work+0x6b8/0xb70 fs/aio.c:1767 process_one_work+0x835/0x1570 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:551 insert_work+0x38/0x230 kernel/workqueue.c:1653 __queue_work+0x62e/0x11d0 kernel/workqueue.c:1802 queue_work_on+0xf4/0x120 kernel/workqueue.c:1837 queue_work include/linux/workqueue.h:548 [inline] schedule_work include/linux/workqueue.h:609 [inline] aio_poll_cancel fs/aio.c:1779 [inline] aio_poll_cancel+0x1c2/0x230 fs/aio.c:1771 __do_sys_io_cancel fs/aio.c:2196 [inline] __se_sys_io_cancel fs/aio.c:2174 [inline] __ia32_sys_io_cancel+0x1c2/0x4a0 fs/aio.c:2174 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 The buggy address belongs to the object at ffff8880490e6000 which belongs to the cache aio_kiocb of size 216 The buggy address is located 32 bytes inside of freed 216-byte region [ffff8880490e6000, ffff8880490e60d8) The buggy address belongs to the physical page: page:ffffea0001243980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x490e6 head:ffffea0001243980 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000840(slab|head|node=1|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 04fff00000000840 ffff8880187f3040 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080190019 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5901, tgid 5900 (syz-executor.3), ts 191806215464, free_ts 191220295668 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4b0/0x1780 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc+0x2ed/0x320 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x123/0x1df0 fs/aio.c:2050 __do_compat_sys_io_submit fs/aio.c:2155 [inline] __se_compat_sys_io_submit fs/aio.c:2125 [inline] __ia32_compat_sys_io_submit+0x1d4/0x3c0 fs/aio.c:2125 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 page last free pid 5208 tgid 5208 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 __put_partials+0x14c/0x170 mm/slub.c:2922 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmalloc_node_trace+0x18a/0x380 mm/slub.c:4020 kmalloc_node include/linux/slab.h:606 [inline] kzalloc_node include/linux/slab.h:722 [inline] __get_vm_area_node+0xe1/0x3e0 mm/vmalloc.c:2588 __vmalloc_node_range+0x27a/0x1540 mm/vmalloc.c:3280 __vmalloc_node mm/vmalloc.c:3385 [inline] vmalloc+0x6b/0x90 mm/vmalloc.c:3418 xt_compat_init_offsets+0xe3/0x220 net/netfilter/x_tables.c:733 compat_table_info+0xb7/0x5b0 net/ipv4/netfilter/ip_tables.c:934 get_info+0x2f0/0x760 net/ipv4/netfilter/ip_tables.c:971 do_ipt_get_ctl+0x16a/0xaa0 net/ipv4/netfilter/ip_tables.c:1651 nf_getsockopt+0x79/0xe0 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x18e/0x1e0 net/ipv4/ip_sockglue.c:1770 Memory state around the buggy address: ffff8880490e5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880490e5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880490e6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880490e6080: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff8880490e6100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- 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