================================================================== BUG: KASAN: slab-out-of-bounds in watch_queue_set_filter+0x78d/0x810 kernel/watch_queue.c:343 Write of size 4 at addr ffff888078cca82c by task syz-executor.0/4462 CPU: 0 PID: 4462 Comm: syz-executor.0 Not tainted 5.17.0-rc6-next-20220303-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 watch_queue_set_filter+0x78d/0x810 kernel/watch_queue.c:343 pipe_ioctl+0x25b/0x2b0 fs/pipe.c:637 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fad1c489049 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fad1d506168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fad1c59bf60 RCX: 00007fad1c489049 RDX: 0000000020000c80 RSI: 0000000000005761 RDI: 0000000000000004 RBP: 00007fad1c4e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffb804eeef R14: 00007fad1d506300 R15: 0000000000022000 Allocated by task 4462: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:589 [inline] kzalloc include/linux/slab.h:717 [inline] watch_queue_set_filter+0x2f2/0x810 kernel/watch_queue.c:332 pipe_ioctl+0x25b/0x2b0 fs/pipe.c:637 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888078cca800 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 44 bytes inside of 64-byte region [ffff888078cca800, ffff888078cca840) The buggy address belongs to the physical page: page:ffffea0001e33280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78cca flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000680680 dead000000000004 ffff888010c41640 raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 3698, tgid 3698 (modprobe), ts 182938254437, free_ts 182522158240 prep_new_page mm/page_alloc.c:2438 [inline] get_page_from_freelist+0xa7f/0x3ec0 mm/page_alloc.c:4182 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5400 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2268 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8d0/0xf30 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x318/0x350 mm/slub.c:4434 kmalloc include/linux/slab.h:589 [inline] kzalloc include/linux/slab.h:717 [inline] tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline] tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x186/0x620 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x272/0x380 security/tomoyo/file.c:771 tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline] tomoyo_file_open+0xa3/0xd0 security/tomoyo/tomoyo.c:306 security_file_open+0x45/0xb0 security/security.c:1651 do_dentry_open+0x358/0x1250 fs/open.c:944 do_open fs/namei.c:3476 [inline] path_openat+0x1c9e/0x2940 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1353 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1403 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3420 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x26d/0x3f0 mm/slub.c:3269 kmalloc include/linux/slab.h:584 [inline] kzalloc include/linux/slab.h:717 [inline] ipv6_add_addr+0x352/0x1ef0 net/ipv6/addrconf.c:1088 addrconf_add_linklocal+0x1c8/0x590 net/ipv6/addrconf.c:3208 addrconf_addr_gen+0x387/0x3d0 net/ipv6/addrconf.c:3339 addrconf_dev_config+0x255/0x420 net/ipv6/addrconf.c:3384 addrconf_notify+0xdbb/0x1ba0 net/ipv6/addrconf.c:3624 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1939 netdev_state_change net/core/dev.c:1329 [inline] netdev_state_change+0x100/0x130 net/core/dev.c:1322 linkwatch_do_dev+0x10e/0x150 net/core/link_watch.c:167 __linkwatch_run_queue+0x243/0x6b0 net/core/link_watch.c:220 Memory state around the buggy address: ffff888078cca700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888078cca780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888078cca800: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888078cca880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888078cca900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================