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BUG: KASAN: slab-out-of-bounds in instrument_copy_from_user_before include/linux/instrumented.h:129 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x7b/0xe0 lib/usercopy.c:22
Write of size 48 at addr ffff888026243308 by task syz-executor236/5081

CPU: 0 PID: 5081 Comm: syz-executor236 Not tainted 6.9.0-rc2-next-20240403-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_copy_from_user_before include/linux/instrumented.h:129 [inline]
 _copy_from_user+0x7b/0xe0 lib/usercopy.c:22
 copy_from_user include/linux/uaccess.h:183 [inline]
 handle_to_path fs/fhandle.c:203 [inline]
 do_handle_open+0x204/0x660 fs/fhandle.c:226
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7f5c7c93f2a9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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:00007ffe1f5b4848 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007ffe1f5b4a28 RCX: 00007f5c7c93f2a9
RDX: 0000000000008c00 RSI: 0000000020000000 RDI: 00000000ffffffff
RBP: 00007f5c7c9b2610 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe1f5b4a18 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Allocated by task 5081:
 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:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4069 [inline]
 __kmalloc_noprof+0x200/0x410 mm/slub.c:4082
 kmalloc_noprof include/linux/slab.h:664 [inline]
 handle_to_path fs/fhandle.c:195 [inline]
 do_handle_open+0x162/0x660 fs/fhandle.c:226
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

The buggy address belongs to the object at ffff888026243300
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 8 bytes inside of
 allocated 48-byte region [ffff888026243300, ffff888026243330)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26243
flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffefff(slab)
raw: 00fff80000000000 ffff888015041640 ffffea0000af65c0 dead000000000002
raw: 0000000000000000 0000000080200020 00000001ffffefff 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 27, tgid -1419877071 (kdevtmpfs), ts 27, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1490
 prep_new_page mm/page_alloc.c:1498 [inline]
 get_page_from_freelist+0x2e7e/0x2f40 mm/page_alloc.c:3454
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712
 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:271 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2249
 allocate_slab+0x5a/0x2e0 mm/slub.c:2412
 new_slab mm/slub.c:2465 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3615
 __slab_alloc+0x58/0xa0 mm/slub.c:3705
 __slab_alloc_node mm/slub.c:3758 [inline]
 slab_alloc_node mm/slub.c:3936 [inline]
 __do_kmalloc_node mm/slub.c:4068 [inline]
 __kmalloc_noprof+0x25e/0x410 mm/slub.c:4082
 kmalloc_noprof include/linux/slab.h:664 [inline]
 kmalloc_array_noprof include/linux/slab.h:699 [inline]
 security_inode_init_security+0x126/0x440 security/security.c:1720
 shmem_mknod+0xc5/0x1d0 mm/shmem.c:3281
 vfs_mknod+0x36d/0x3b0 fs/namei.c:4001
 handle_create drivers/base/devtmpfs.c:219 [inline]
 handle drivers/base/devtmpfs.c:384 [inline]
 devtmpfs_work_loop+0x96b/0x1040 drivers/base/devtmpfs.c:399
 devtmpfsd+0x4c/0x50 drivers/base/devtmpfs.c:441
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888026243200: 00 00 00 00 04 fc fc fc fc fc fc fc fc fc fc fc
 ffff888026243280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff888026243300: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff888026243380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888026243400: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
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