================================================================== BUG: KASAN: slab-out-of-bounds in strscpy+0x23b/0x2a0 lib/string.c:174 Read of size 1 at addr ffff888065594a95 by task syz-executor.4/18946 CPU: 0 PID: 18946 Comm: syz-executor.4 Not tainted 6.2.0-rc7-next-20230208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 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:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:536 strscpy+0x23b/0x2a0 lib/string.c:174 strscpy include/linux/fortify-string.h:328 [inline] __xfs_xattr_put_listent+0x161/0x220 fs/xfs/xfs_xattr.c:215 xfs_xattr_put_listent+0xed/0x1b0 fs/xfs/xfs_xattr.c:273 xfs_attr_shortform_list fs/xfs/xfs_attr_list.c:182 [inline] xfs_attr_list_ilocked+0x129d/0x1940 fs/xfs/xfs_attr_list.c:516 xfs_attr_list+0x1fb/0x2c0 fs/xfs/xfs_attr_list.c:536 xfs_vn_listxattr+0xec/0x180 fs/xfs/xfs_xattr.c:299 vfs_listxattr+0x109/0x190 fs/xattr.c:473 ovl_listxattr+0x77/0x330 fs/overlayfs/inode.c:434 vfs_listxattr+0x109/0x190 fs/xattr.c:473 ovl_copy_xattr+0x1bd/0xc90 fs/overlayfs/copy_up.c:99 ovl_copy_up_metadata+0x191/0x960 fs/overlayfs/copy_up.c:616 ovl_copy_up_workdir fs/overlayfs/copy_up.c:733 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:879 [inline] ovl_copy_up_one+0xa6d/0x2cc0 fs/overlayfs/copy_up.c:1049 ovl_copy_up_flags+0x150/0x1d0 fs/overlayfs/copy_up.c:1095 ovl_rename+0x28d/0x1770 fs/overlayfs/dir.c:1139 vfs_rename+0xef6/0x17a0 fs/namei.c:4772 do_renameat2+0xb62/0xc90 fs/namei.c:4923 __do_sys_rename fs/namei.c:4969 [inline] __se_sys_rename fs/namei.c:4967 [inline] __x64_sys_rename+0x81/0xa0 fs/namei.c:4967 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: 0033:0x7f871a68c0f9 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:00007f871b465168 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007f871a7ac050 RCX: 00007f871a68c0f9 RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000020000100 RBP: 00007f871a6e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5cb53f9f R14: 00007f871b465300 R15: 0000000000022000 Allocated by task 18908: 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+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x5b/0xc0 mm/slab_common.c:987 __do_krealloc mm/slab_common.c:1364 [inline] krealloc+0x5e/0x100 mm/slab_common.c:1397 xfs_idata_realloc+0xcc/0x280 fs/xfs/libxfs/xfs_inode_fork.c:503 xfs_attr_shortform_add+0x23b/0x930 fs/xfs/libxfs/xfs_attr_leaf.c:775 xfs_attr_shortform_addname+0x3bf/0x610 fs/xfs/libxfs/xfs_attr.c:1158 xfs_attr_try_sf_addname+0x6b/0x240 fs/xfs/libxfs/xfs_attr.c:358 xfs_attr_sf_addname fs/xfs/libxfs/xfs_attr.c:383 [inline] xfs_attr_set_iter+0x17dd/0x3930 fs/xfs/libxfs/xfs_attr.c:719 xfs_xattri_finish_update+0x3c/0x140 fs/xfs/xfs_attr_item.c:332 xfs_attr_finish_item+0x6d/0x280 fs/xfs/xfs_attr_item.c:463 xfs_defer_finish_one fs/xfs/libxfs/xfs_defer.c:479 [inline] xfs_defer_finish_noroll+0xac5/0x2430 fs/xfs/libxfs/xfs_defer.c:563 __xfs_trans_commit+0x82b/0x1100 fs/xfs/xfs_trans.c:970 xfs_attr_set+0x13ac/0x2650 fs/xfs/libxfs/xfs_attr.c:1083 xfs_attr_change fs/xfs/xfs_xattr.c:106 [inline] xfs_xattr_set+0xf2/0x1c0 fs/xfs/xfs_xattr.c:151 __vfs_setxattr+0x173/0x1e0 fs/xattr.c:203 __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:237 __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:298 vfs_setxattr+0x143/0x340 fs/xattr.c:324 ovl_do_setxattr fs/overlayfs/overlayfs.h:255 [inline] ovl_setxattr fs/overlayfs/overlayfs.h:267 [inline] ovl_check_setxattr+0x183/0x350 fs/overlayfs/util.c:641 ovl_set_origin+0xed/0x140 fs/overlayfs/copy_up.c:450 ovl_copy_up_metadata+0x5e0/0x960 fs/overlayfs/copy_up.c:638 ovl_copy_up_workdir fs/overlayfs/copy_up.c:733 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:879 [inline] ovl_copy_up_one+0xa6d/0x2cc0 fs/overlayfs/copy_up.c:1049 ovl_copy_up_flags+0x150/0x1d0 fs/overlayfs/copy_up.c:1095 ovl_setattr+0x111/0x520 fs/overlayfs/inode.c:45 notify_change+0xb2c/0x1180 fs/attr.c:482 chown_common+0x57f/0x650 fs/open.c:738 do_fchownat+0x12a/0x1e0 fs/open.c:769 __do_sys_chown fs/open.c:789 [inline] __se_sys_chown fs/open.c:787 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:787 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 The buggy address belongs to the object at ffff888065594a80 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes to the right of allocated 21-byte region [ffff888065594a80, ffff888065594a95) The buggy address belongs to the physical page: page:ffffea0001956500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x65594 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff888012441500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000400040 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 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5810, tgid 5810 (kworker/u4:10), ts 1808983034555, free_ts 1808930270495 prep_new_page mm/page_alloc.c:2552 [inline] get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4339 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5605 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x28e/0x380 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x136/0x330 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1061 kmalloc include/linux/slab.h:580 [inline] batadv_mcast_mla_softif_get_ipv6 net/batman-adv/multicast.c:446 [inline] batadv_mcast_mla_softif_get net/batman-adv/multicast.c:504 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:878 [inline] batadv_mcast_mla_update+0x13bf/0x2c40 net/batman-adv/multicast.c:915 process_one_work+0x9bf/0x1820 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1453 [inline] free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1503 free_unref_page_prepare mm/page_alloc.c:3401 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3496 vfree+0x180/0x7e0 mm/vmalloc.c:2741 delayed_vfree_work+0x57/0x70 mm/vmalloc.c:2662 process_one_work+0x9bf/0x1820 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff888065594980: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ffff888065594a00: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc >ffff888065594a80: 00 00 05 fc fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff888065594b00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff888065594b80: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc 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