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BUG: KASAN: use-after-free in mprotect_fixup+0x711/0x780 mm/mprotect.c:568
Read of size 8 at addr ffff88802499a630 by task syz-executor.0/4083

CPU: 1 PID: 4083 Comm: syz-executor.0 Not tainted 5.19.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 mprotect_fixup+0x711/0x780 mm/mprotect.c:568
 do_mprotect_pkey+0x406/0x7e0 mm/mprotect.c:733
 __do_sys_pkey_mprotect mm/mprotect.c:768 [inline]
 __se_sys_pkey_mprotect mm/mprotect.c:765 [inline]
 __x64_sys_pkey_mprotect+0x8e/0xf0 mm/mprotect.c:765
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fa344089109
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa3451b7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000149
RAX: ffffffffffffffda RBX: 00007fa34419bf60 RCX: 00007fa344089109
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000
RBP: 00007fa3451b71d0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc1794e7df R14: 00007fa3451b7300 R15: 0000000000022000
 </TASK>

Allocated by task 4083:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:750 [inline]
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3268
 vm_area_dup+0x83/0x380 kernel/fork.c:467
 __split_vma+0x88/0x480 mm/mmap.c:2960
 mprotect_fixup+0x54b/0x780 mm/mprotect.c:569
 do_mprotect_pkey+0x406/0x7e0 mm/mprotect.c:733
 __do_sys_pkey_mprotect mm/mprotect.c:768 [inline]
 __se_sys_pkey_mprotect mm/mprotect.c:765 [inline]
 __x64_sys_pkey_mprotect+0x8e/0xf0 mm/mprotect.c:765
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Freed by task 4083:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1754 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780
 slab_free mm/slub.c:3536 [inline]
 kmem_cache_free+0xdd/0x5a0 mm/slub.c:3553
 __vma_adjust+0x845/0x2630 mm/mmap.c:1113
 vma_merge+0xa8d/0x12f0 mm/mmap.c:1366
 mprotect_fixup+0x2cc/0x780 mm/mprotect.c:557
 do_mprotect_pkey+0x406/0x7e0 mm/mprotect.c:733
 __do_sys_pkey_mprotect mm/mprotect.c:768 [inline]
 __se_sys_pkey_mprotect mm/mprotect.c:765 [inline]
 __x64_sys_pkey_mprotect+0x8e/0xf0 mm/mprotect.c:765
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

The buggy address belongs to the object at ffff88802499a630
 which belongs to the cache vm_area_struct of size 200
The buggy address is located 0 bytes inside of
 200-byte region [ffff88802499a630, ffff88802499a6f8)

The buggy address belongs to the physical page:
page:ffffea0000926680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2499a
memcg:ffff8880206be301
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000968e80 dead000000000005 ffff888140006b40
raw: 0000000000000000 00000000800f000f 00000001ffffffff ffff8880206be301
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3814, tgid 3814 (dhcpcd-run-hook), ts 55127326908, free_ts 55115182052
 prep_new_page mm/page_alloc.c:2456 [inline]
 get_page_from_freelist+0x19d2/0x3b30 mm/page_alloc.c:4198
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5415
 alloc_slab_page mm/slub.c:1824 [inline]
 allocate_slab+0x26c/0x3c0 mm/slub.c:1969
 new_slab mm/slub.c:2029 [inline]
 ___slab_alloc+0x9bc/0xe10 mm/slub.c:3031
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
 slab_alloc_node mm/slub.c:3209 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3268
 vm_area_dup+0x83/0x380 kernel/fork.c:467
 dup_mmap kernel/fork.c:646 [inline]
 dup_mm+0x56a/0x11d0 kernel/fork.c:1538
 copy_mm kernel/fork.c:1590 [inline]
 copy_process+0x349a/0x6690 kernel/fork.c:2254
 kernel_clone+0xb8/0x7f0 kernel/fork.c:2669
 __do_sys_clone+0xa1/0xe0 kernel/fork.c:2803
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1371 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421
 free_unref_page_prepare mm/page_alloc.c:3343 [inline]
 free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2548
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:750 [inline]
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3268
 getname_flags.part.0+0x4a/0x440 fs/namei.c:139
 do_sys_openat2+0xd2/0x3f0 fs/open.c:1272
 do_sys_open fs/open.c:1294 [inline]
 __do_sys_openat fs/open.c:1310 [inline]
 __se_sys_openat fs/open.c:1305 [inline]
 __x64_sys_openat+0x11b/0x1d0 fs/open.c:1305
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Memory state around the buggy address:
 ffff88802499a500: fc fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb
 ffff88802499a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
>ffff88802499a600: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                     ^
 ffff88802499a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc
 ffff88802499a700: fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00
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