syzbot

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BUG: KASAN: invalid-access in copy_page+0x10/0xd0 arch/arm64/lib/copy_page.S:26
Read at addr fbff00001e8a9000 by task syz-executor.1/2227
Pointer tag: [fb], memory tag: [fd]

CPU: 0 PID: 2227 Comm: syz-executor.1 Not tainted 6.0.0-syzkaller-10109-gaa512c115a09 #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156
 dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline]
 show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report+0x104/0x604 mm/kasan/report.c:433
 kasan_report+0x8c/0xb0 mm/kasan/report.c:495
 __do_kernel_fault+0x11c/0x1bc arch/arm64/mm/fault.c:319
 do_bad_area arch/arm64/mm/fault.c:469 [inline]
 do_tag_check_fault+0x78/0x90 arch/arm64/mm/fault.c:745
 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:821
 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:366
 el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:426
 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576
 copy_page+0x10/0xd0 arch/arm64/lib/copy_page.S:26
 copy_user_highpage+0x18/0x40 arch/arm64/mm/copypage.c:34
 __wp_page_copy_user mm/memory.c:2856 [inline]
 wp_page_copy+0xa4/0x690 mm/memory.c:3117
 do_wp_page+0x138/0x620 mm/memory.c:3479
 handle_pte_fault mm/memory.c:4935 [inline]
 __handle_mm_fault+0x660/0xe70 mm/memory.c:5059
 handle_mm_fault+0xec/0x280 mm/memory.c:5157
 __do_page_fault arch/arm64/mm/fault.c:502 [inline]
 do_page_fault+0x17c/0x3d0 arch/arm64/mm/fault.c:602
 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:821
 el0_da+0x30/0xb4 arch/arm64/kernel/entry-common.c:514
 el0t_64_sync_handler+0x68/0xc0 arch/arm64/kernel/entry-common.c:657
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581

The buggy address belongs to the physical page:
page:00000000da91530f refcount:3 mapcount:2 mapping:0000000000000000 index:0xfffffffff pfn:0x5e8a9
memcg:fdff00001f5bc000
anon flags: 0x1ffc1000208001c(uptodate|dirty|lru|swapbacked|arch_2|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x4)
raw: 01ffc1000208001c fffffc00005ac888 faff000009655000 fbff000005930301
raw: 0000000fffffffff 0000000000000000 0000000300000001 fdff00001f5bc000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00001e8a8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff00001e8a8f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff00001e8a9000: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
                   ^
 ffff00001e8a9100: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
 ffff00001e8a9200: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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