================================================================== BUG: KASAN: slab-use-after-free in iopt_unmap_iova_range+0x5ba/0x5f0 drivers/iommu/iommufd/io_pagetable.c:499 Read of size 4 at addr ffff88807e7bd684 by task syz-executor.3/17048 CPU: 0 PID: 17048 Comm: syz-executor.3 Not tainted 6.4.0-rc7-syzkaller-00226-ga92b7d26c743 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 iopt_unmap_iova_range+0x5ba/0x5f0 drivers/iommu/iommufd/io_pagetable.c:499 iopt_unmap_all+0x27/0x50 drivers/iommu/iommufd/io_pagetable.c:555 iommufd_ioas_unmap+0x3d0/0x490 drivers/iommu/iommufd/ioas.c:300 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f720ec8c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f720f911168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f720edac120 RCX: 00007f720ec8c389 RDX: 00000000200001c0 RSI: 0000000000003b86 RDI: 0000000000000003 RBP: 00007f720ecd7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc10895daf R14: 00007f720f911300 R15: 0000000000022000 Allocated by task 17033: kasan_save_stack+0x22/0x40 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 mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] iopt_alloc_area_pages+0x94/0x560 drivers/iommu/iommufd/io_pagetable.c:234 iopt_map_pages drivers/iommu/iommufd/io_pagetable.c:339 [inline] iopt_map_user_pages+0x205/0x4e0 drivers/iommu/iommufd/io_pagetable.c:404 iommufd_ioas_map+0x329/0x5f0 drivers/iommu/iommufd/ioas.c:222 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 17034: kasan_save_stack+0x22/0x40 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:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] __cache_free mm/slab.c:3389 [inline] __do_kmem_cache_free mm/slab.c:3576 [inline] __kmem_cache_free+0xcd/0x2c0 mm/slab.c:3583 iopt_abort_area drivers/iommu/iommufd/io_pagetable.c:292 [inline] iopt_unmap_iova_range+0x288/0x5f0 drivers/iommu/iommufd/io_pagetable.c:509 iopt_unmap_all+0x27/0x50 drivers/iommu/iommufd/io_pagetable.c:555 iommufd_ioas_unmap+0x3d0/0x490 drivers/iommu/iommufd/ioas.c:300 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0x7b/0x90 mm/kasan/generic.c:491 kvfree_call_rcu+0x70/0xad0 kernel/rcu/tree.c:3332 drop_sysctl_table+0x3c2/0x4e0 fs/proc/proc_sysctl.c:1695 unregister_sysctl_table.part.0+0x9c/0x1b0 fs/proc/proc_sysctl.c:1733 unregister_sysctl_table+0x35/0x40 fs/proc/proc_sysctl.c:1713 mpls_net_exit+0x6a/0x320 net/mpls/af_mpls.c:2708 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:614 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2408 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2555 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0x7b/0x90 mm/kasan/generic.c:491 kvfree_call_rcu+0x70/0xad0 kernel/rcu/tree.c:3332 fib_rule_put include/net/fib_rules.h:113 [inline] fib_rule_put include/net/fib_rules.h:110 [inline] fib_rules_cleanup_ops net/core/fib_rules.c:194 [inline] fib_rules_unregister+0x325/0x450 net/core/fib_rules.c:206 ipmr_net_exit_batch+0x53/0xa0 net/ipv4/ipmr.c:3115 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:614 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2408 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2555 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88807e7bd600 which belongs to the cache kmalloc-cg-192 of size 192 The buggy address is located 132 bytes inside of freed 192-byte region [ffff88807e7bd600, ffff88807e7bd6c0) The buggy address belongs to the physical page: page:ffffea0001f9ef40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e7bd memcg:ffff888024215e01 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x10() raw: 00fff00000000200 ffff88801244d500 ffffea0001f444d0 ffffea0001f16b90 raw: 0000000000000000 ffff88807e7bd000 0000000100000010 ffff888024215e01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x3420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 9984, tgid 9978 (syz-executor.5), ts 403865437940, free_ts 402707159152 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1360 [inline] cache_grow_begin+0x9b/0x3b0 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] __do_cache_alloc mm/slab.c:3201 [inline] slab_alloc_node mm/slab.c:3249 [inline] __kmem_cache_alloc_node+0x360/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] iommufd_test_alloc_access drivers/iommu/iommufd/selftest.c:680 [inline] iommufd_test_create_access drivers/iommu/iommufd/selftest.c:710 [inline] iommufd_test+0x1328/0x2c20 drivers/iommu/iommufd/selftest.c:961 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564 free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:2705 release_pages+0xcd8/0x1380 mm/swap.c:1042 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97 zap_pte_range mm/memory.c:1514 [inline] zap_pmd_range mm/memory.c:1563 [inline] zap_pud_range mm/memory.c:1592 [inline] zap_p4d_range mm/memory.c:1613 [inline] unmap_page_range+0x24f4/0x38e0 mm/memory.c:1634 unmap_single_vma+0x19a/0x2b0 mm/memory.c:1680 unmap_vmas+0x234/0x380 mm/memory.c:1719 exit_mmap+0x190/0x930 mm/mmap.c:3108 __mmput+0x128/0x4c0 kernel/fork.c:1351 mmput+0x60/0x70 kernel/fork.c:1373 exit_mm kernel/exit.c:567 [inline] do_exit+0x9b0/0x29b0 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x2318/0x25b0 kernel/signal.c:2876 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 Memory state around the buggy address: ffff88807e7bd580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88807e7bd600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807e7bd680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88807e7bd700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807e7bd780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================