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BUG: KASAN: slab-out-of-bounds in user_mode arch/x86/include/asm/ptrace.h:131 [inline]
BUG: KASAN: slab-out-of-bounds in trace_page_fault_entries arch/x86/mm/fault.c:1516 [inline]
BUG: KASAN: slab-out-of-bounds in do_page_fault+0x6d/0x320 arch/x86/mm/fault.c:1528
Read of size 8 at addr ffff8881bc3b7f00 by task syz.6.1040/4202

CPU: 1 PID: 4202 Comm: syz.6.1040 Tainted: G        W         5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:

Allocated by task 714674688:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529
 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 __kmalloc+0x106/0x2f0 mm/slub.c:3909
 kmalloc include/linux/slab.h:561 [inline]
 kzalloc include/linux/slab.h:690 [inline]
 platform_device_alloc drivers/base/platform.c:383 [inline]
 platform_device_register_full+0x76/0x740 drivers/base/platform.c:627
 acpi_create_platform_device+0x4bd/0x550 drivers/acpi/acpi_platform.c:156
 acpi_default_enumeration drivers/acpi/scan.c:1941 [inline]
 acpi_bus_attach+0x87f/0xb50 drivers/acpi/scan.c:2047
 acpi_bus_attach+0x238/0xb50 drivers/acpi/scan.c:2053
 acpi_bus_attach+0x238/0xb50 drivers/acpi/scan.c:2053
 acpi_bus_attach+0x238/0xb50 drivers/acpi/scan.c:2053
 acpi_bus_attach+0x238/0xb50 drivers/acpi/scan.c:2053
 acpi_bus_scan+0xd2/0x120 drivers/acpi/scan.c:2105
 acpi_scan_init+0x1e5/0x6e6 drivers/acpi/scan.c:2265
 acpi_init+0x170/0x223 drivers/acpi/bus.c:1250
 do_one_initcall+0x196/0x5c0 init/main.c:1192
 do_initcall_level+0x21b/0x408 init/main.c:1259
 do_initcalls+0x50/0x92 init/main.c:1275
 do_basic_setup+0x88/0x8f init/main.c:1295
 kernel_init_freeable+0x282/0x42f init/main.c:1458
 kernel_init+0x11/0x1a0 init/main.c:1375
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354

Freed by task 2175:
(stack is not available)

The buggy address belongs to the object at ffff8881bc3b6600
 which belongs to the cache names_cache of size 4096
The buggy address is located 2304 bytes to the right of
 4096-byte region [ffff8881bc3b6600, ffff8881bc3b7600)
The buggy address belongs to the page:
page:ffffea0006f0ec00 refcount:1 mapcount:0 mapping:ffff8881f5d00c80 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5d00c80
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x35e/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894
 alloc_slab_page+0x3c/0x3b0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x93/0x420 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x29e/0x420 mm/slub.c:2667
 __slab_alloc+0x63/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0x12c/0x270 mm/slub.c:2842
 getname_flags+0xb9/0x500 fs/namei.c:141
 getname+0x19/0x20 fs/namei.c:212
 do_sys_open+0x26c/0x5d0 fs/open.c:1117
 __do_sys_openat fs/open.c:1150 [inline]
 __se_sys_openat fs/open.c:1144 [inline]
 __x64_sys_openat+0xa2/0xb0 fs/open.c:1144
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881bc3b7e00: fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00 00
 ffff8881bc3b7e80: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881bc3b7f00: fc fc fc fc fc fc fc fc fc fc fc fc f1 f1 f1 f1
                   ^
 ffff8881bc3b7f80: 00 f2 f2 f2 04 f3 f3 f3 fc fc fc fc fc fc fc fc
 ffff8881bc3b8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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