================================================================== BUG: KASAN: slab-out-of-bounds in iov_iter_revert+0x1c1/0x590 lib/iov_iter.c:633 Read of size 4 at addr ffff888012367a18 by task syz.0.0/5317 CPU: 0 UID: 0 PID: 5317 Comm: syz.0.0 Not tainted 6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 iov_iter_revert+0x1c1/0x590 lib/iov_iter.c:633 p9_client_write+0x444/0x7a0 net/9p/client.c:1669 v9fs_issue_write+0xf0/0x1d0 fs/9p/vfs_addr.c:59 netfs_do_issue_write fs/netfs/write_issue.c:239 [inline] netfs_issue_write fs/netfs/write_issue.c:269 [inline] netfs_end_issue_write+0x18d/0x420 fs/netfs/write_issue.c:541 netfs_unbuffered_write+0x589/0x600 fs/netfs/write_issue.c:733 netfs_unbuffered_write_iter_locked+0x456/0x9f0 fs/netfs/direct_write.c:100 netfs_unbuffered_write_iter+0x4e1/0x6a0 fs/netfs/direct_write.c:195 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xacf/0xd10 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fecb6b8d169 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:00007fecb7ac9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fecb6da5fa0 RCX: 00007fecb6b8d169 RDX: 0000000000000010 RSI: 0000400000000840 RDI: 0000000000000007 RBP: 00007fecb6c0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fecb6da5fa0 R15: 00007ffcb48d62e8 Allocated by task 5317: 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+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] aa_label_asxprint+0x6e/0x130 security/apparmor/label.c:1684 apparmor_label_to_secctx security/apparmor/secid.c:64 [inline] apparmor_lsmprop_to_secctx+0x9e/0x180 security/apparmor/secid.c:93 security_lsmprop_to_secctx+0x93/0x2b0 security/security.c:4343 audit_log_task_context+0xff/0x260 kernel/audit.c:2190 integrity_audit_message+0x228/0x4f0 security/integrity/integrity_audit.c:55 integrity_audit_msg+0x41/0x60 security/integrity/integrity_audit.c:32 ima_collect_measurement+0x83f/0xb20 security/integrity/ima/ima_api.c:324 process_measurement+0x1351/0x1fb0 security/integrity/ima/ima_main.c:375 ima_file_check+0xd9/0x120 security/integrity/ima/ima_main.c:603 security_file_post_open+0xb9/0x280 security/security.c:3130 do_open fs/namei.c:3832 [inline] path_openat+0x2cca/0x3590 fs/namei.c:3989 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13e/0x1d0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5317: 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+0x196/0x430 mm/slub.c:4757 apparmor_release_secctx+0x6c/0xe0 security/apparmor/secid.c:112 security_release_secctx+0x8c/0x160 security/security.c:4372 audit_log_task_context+0x155/0x260 kernel/audit.c:2198 integrity_audit_message+0x228/0x4f0 security/integrity/integrity_audit.c:55 integrity_audit_msg+0x41/0x60 security/integrity/integrity_audit.c:32 ima_collect_measurement+0x83f/0xb20 security/integrity/ima/ima_api.c:324 process_measurement+0x1351/0x1fb0 security/integrity/ima/ima_main.c:375 ima_file_check+0xd9/0x120 security/integrity/ima/ima_main.c:603 security_file_post_open+0xb9/0x280 security/security.c:3130 do_open fs/namei.c:3832 [inline] path_openat+0x2cca/0x3590 fs/namei.c:3989 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13e/0x1d0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888012367a00 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 8 bytes to the right of allocated 16-byte region [ffff888012367a00, ffff888012367a10) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12367 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b041640 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080800080 00000000f5000000 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5299, tgid 5299 (syz-executor), ts 57538728677, free_ts 57494496884 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_pages_slowpath+0x434/0x10b0 mm/page_alloc.c:4289 __alloc_frozen_pages_noprof+0x49b/0x710 mm/page_alloc.c:4753 alloc_slab_page mm/slub.c:2425 [inline] allocate_slab+0x66/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __kmalloc_cache_node_noprof+0x294/0x3a0 mm/slub.c:4333 kmalloc_node_noprof include/linux/slab.h:924 [inline] hugetlb_cgroup_css_alloc+0x173/0x8c0 mm/hugetlb_cgroup.c:171 css_create kernel/cgroup/cgroup.c:5627 [inline] cgroup_apply_control_enable+0x39c/0xaf0 kernel/cgroup/cgroup.c:3239 cgroup_mkdir+0xa83/0xd60 kernel/cgroup/cgroup.c:5843 kernfs_iop_mkdir+0x253/0x3f0 fs/kernfs/dir.c:1247 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4313 do_mkdirat+0x264/0x3a0 fs/namei.c:4336 __do_sys_mkdirat fs/namei.c:4351 [inline] __se_sys_mkdirat fs/namei.c:4349 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4349 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 page last free pid 5296 tgid 5296 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 __slab_free+0x2c2/0x380 mm/slub.c:4520 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4171 getname_flags+0xb7/0x540 fs/namei.c:139 do_sys_openat2+0xd2/0x1d0 fs/open.c:1422 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888012367900: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc ffff888012367980: fa fb fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc >ffff888012367a00: fa fb fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc ^ ffff888012367a80: 00 00 fc fc 00 00 fc fc 00 00 fc fc fc fc fc fc ffff888012367b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================