================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in atomic_long_read include/linux/atomic/atomic-instrumented.h:3160 [inline] BUG: KASAN: slab-use-after-free in is_rwsem_reader_owned kernel/locking/rwsem.c:193 [inline] BUG: KASAN: slab-use-after-free in __up_read+0xce/0x750 kernel/locking/rwsem.c:1343 Read of size 8 at addr ffff888064d0e800 by task syz-executor.0/15067 CPU: 0 PID: 15067 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller-12401-g8f6f76a6a29f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 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:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xef/0x190 mm/kasan/generic.c:187 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:3160 [inline] is_rwsem_reader_owned kernel/locking/rwsem.c:193 [inline] __up_read+0xce/0x750 kernel/locking/rwsem.c:1343 iommufd_put_object drivers/iommu/iommufd/iommufd_private.h:160 [inline] iommufd_vfio_ioas+0x46c/0x580 drivers/iommu/iommufd/vfio_compat.c:146 iommufd_fops_ioctl+0x35a/0x4e0 drivers/iommu/iommufd/main.c:404 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7ff6f8a7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff6f97200c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff6f8b9bf80 RCX: 00007ff6f8a7cae9 RDX: 0000000020000080 RSI: 0000000000003b88 RDI: 0000000000000003 RBP: 00007ff6f8ac847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007ff6f8b9bf80 R15: 00007fff48e5ed28 Allocated by task 15067: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0x60/0x100 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] _iommufd_object_alloc+0x26/0x1b0 drivers/iommu/iommufd/main.c:40 iommufd_ioas_alloc drivers/iommu/iommufd/ioas.c:27 [inline] iommufd_ioas_alloc_ioctl+0xaf/0x370 drivers/iommu/iommufd/ioas.c:46 iommufd_fops_ioctl+0x35a/0x4e0 drivers/iommu/iommufd/main.c:404 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 15077: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xc0/0x180 mm/slub.c:3822 iommufd_destroy+0x11e/0x180 drivers/iommu/iommufd/main.c:216 iommufd_fops_ioctl+0x35a/0x4e0 drivers/iommu/iommufd/main.c:404 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff888064d0e800 which belongs to the cache kmalloc-cg-1k of size 1024 The buggy address is located 0 bytes inside of freed 1024-byte region [ffff888064d0e800, ffff888064d0ec00) The buggy address belongs to the physical page: page:ffffea0001934200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x64d08 head:ffffea0001934200 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88801cc87601 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff88801304f280 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff88801cc87601 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5154, tgid 5154 (syz-executor.5), ts 1071196379891, free_ts 34830582447 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0xa25/0x36c0 mm/page_alloc.c:3312 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4568 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x251/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8c7/0x1580 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x131/0x310 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0x52/0x110 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:607 kvmalloc include/linux/slab.h:738 [inline] xt_alloc_table_info+0x3e/0xa0 net/netfilter/x_tables.c:1192 do_replace net/ipv4/netfilter/ip_tables.c:1122 [inline] do_ipt_set_ctl+0x541/0xbe0 net/ipv4/netfilter/ip_tables.c:1627 nf_setsockopt+0x87/0xe0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xc7/0xe0 net/ipv4/ip_sockglue.c:1426 tcp_setsockopt+0x9d/0x100 net/ipv4/tcp.c:3704 do_sock_setsockopt+0x222/0x470 net/socket.c:2315 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x4f8/0xa90 mm/page_alloc.c:2347 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487 free_contig_range+0xb6/0x190 mm/page_alloc.c:6536 destroy_args+0x7c9/0xa10 mm/debug_vm_pgtable.c:1028 debug_vm_pgtable+0x1d79/0x3e00 mm/debug_vm_pgtable.c:1408 do_one_initcall+0x11c/0x640 init/main.c:1236 do_initcall_level init/main.c:1298 [inline] do_initcalls init/main.c:1314 [inline] do_basic_setup init/main.c:1333 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1551 kernel_init+0x1c/0x2a0 init/main.c:1441 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Memory state around the buggy address: ffff888064d0e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888064d0e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888064d0e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888064d0e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888064d0e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================