R13: 0000000000000000 R14: 00007f7ff4fa5fa0 R15: 00007ffe807e1a68 iommufd_mock iommufd_mock0: Adding to iommu group 0 ================================================================== BUG: KASAN: slab-use-after-free in software_node_notify_remove+0x16a/0x170 drivers/base/swnode.c:1108 Read of size 1 at addr ffff8881721ed908 by task syz.3.18/3559 CPU: 1 UID: 0 PID: 3559 Comm: syz.3.18 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x108/0x280 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 software_node_notify_remove+0x16a/0x170 drivers/base/swnode.c:1108 device_platform_notify_remove drivers/base/core.c:2386 [inline] device_del+0x44c/0x730 drivers/base/core.c:3857 device_unregister+0x16/0xa0 drivers/base/core.c:3895 mock_dev_destroy drivers/iommu/iommufd/selftest.c:931 [inline] iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:993 [inline] iommufd_test+0x236d/0x40a0 drivers/iommu/iommufd/selftest.c:1702 iommufd_fops_ioctl+0x3f8/0x4b0 drivers/iommu/iommufd/main.c:419 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xab/0x100 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x170 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7ff4d8d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7ff5b14038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7ff4fa5fa0 RCX: 00007f7ff4d8d169 RDX: 0000200000000200 RSI: 0000000000003ba0 RDI: 0000000000000003 RBP: 00007f7ff5b14090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00007f7ff4fa5fa0 R15: 00007ffe807e1a68 Allocated by task 3559: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x238/0x430 mm/slub.c:4325 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] swnode_register+0x54/0x500 drivers/base/swnode.c:790 fwnode_create_software_node+0x155/0x1a0 drivers/base/swnode.c:949 device_create_managed_software_node+0xd3/0x1b0 drivers/base/swnode.c:1060 mock_dev_create drivers/iommu/iommufd/selftest.c:913 [inline] iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:960 [inline] iommufd_test+0x1cac/0x40a0 drivers/iommu/iommufd/selftest.c:1702 iommufd_fops_ioctl+0x3f8/0x4b0 drivers/iommu/iommufd/main.c:419 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xab/0x100 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x170 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 3559: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 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:4609 [inline] kfree+0x17c/0x3d0 mm/slub.c:4757 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x186/0x340 lib/kobject.c:737 software_node_notify_remove+0x114/0x170 drivers/base/swnode.c:1106 device_platform_notify_remove drivers/base/core.c:2386 [inline] device_del+0x44c/0x730 drivers/base/core.c:3857 device_unregister+0x16/0xa0 drivers/base/core.c:3895 mock_dev_destroy drivers/iommu/iommufd/selftest.c:931 [inline] iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:993 [inline] iommufd_test+0x236d/0x40a0 drivers/iommu/iommufd/selftest.c:1702 iommufd_fops_ioctl+0x3f8/0x4b0 drivers/iommu/iommufd/main.c:419 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xab/0x100 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x170 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8881721ed800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 264 bytes inside of freed 512-byte region [ffff8881721ed800, ffff8881721eda00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1721ec head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x100000000000040(head|node=0|zone=2) page_type: f5(slab) raw: 0100000000000040 ffff888100041c80 ffffea00044ee800 dead000000000003 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 0100000000000040 ffff888100041c80 ffffea00044ee800 dead000000000003 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 0100000000000002 ffffea0005c87b01 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1763, tgid 1763 (syz-executor), ts 34603668982, free_ts 24024744640 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x108/0x120 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x4725/0x4900 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x256/0x650 mm/page_alloc.c:4739 alloc_pages_mpol+0x224/0x4e0 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8b/0x350 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xa19/0x1160 mm/slub.c:3826 __slab_alloc mm/slub.c:3916 [inline] __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __kmalloc_cache_noprof+0x299/0x430 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] seg6_net_init+0x4e/0x150 net/ipv6/seg6.c:424 ops_init+0x154/0x3f0 net/core/net_namespace.c:138 setup_net+0x306/0x880 net/core/net_namespace.c:362 copy_net_ns+0x27d/0x460 net/core/net_namespace.c:516 create_new_namespaces+0x381/0x660 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xd8/0x120 kernel/nsproxy.c:228 ksys_unshare+0x3dd/0x840 kernel/fork.c:3342 __do_sys_unshare kernel/fork.c:3413 [inline] __se_sys_unshare kernel/fork.c:3411 [inline] __x64_sys_unshare+0x33/0x40 kernel/fork.c:3411 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x170 arch/x86/entry/common.c:83 page last free pid 1732 tgid 1732 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xc1f/0xea0 mm/page_alloc.c:2660 __folio_put+0x234/0x2c0 mm/swap.c:112 pipe_buf_release include/linux/pipe_fs_i.h:219 [inline] pipe_update_tail fs/pipe.c:224 [inline] pipe_read+0x508/0xce0 fs/pipe.c:344 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x870/0xae0 fs/read_write.c:565 ksys_read+0x149/0x230 fs/read_write.c:708 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x170 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8881721ed800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881721ed880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881721ed900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881721ed980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881721eda00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================