syzbot

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BUG: KASAN: use-after-free in drm_gem_object_release_handle+0xa1/0xb0 drivers/gpu/drm/drm_gem.c:239
Read of size 8 at addr ffff8880779a89e8 by task syz-executor213/3613

CPU: 0 PID: 3613 Comm: syz-executor213 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
 drm_gem_object_release_handle+0xa1/0xb0 drivers/gpu/drm/drm_gem.c:239
 idr_for_each+0x113/0x220 lib/idr.c:208
 drm_gem_release+0x22/0x30 drivers/gpu/drm/drm_gem.c:918
 drm_file_free+0x7bb/0xb90 drivers/gpu/drm/drm_file.c:276
 drm_release+0x1a6/0x4d0 drivers/gpu/drm/drm_file.c:490
 __fput+0x27c/0xa90 fs/file_table.c:320
 task_work_run+0x16b/0x270 kernel/task_work.c:179
 ptrace_notify+0x114/0x140 kernel/signal.c:2354
 ptrace_report_syscall include/linux/ptrace.h:420 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
 syscall_exit_work kernel/entry/common.c:251 [inline]
 syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:278
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:296
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f06220eff53
Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb ba 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
RSP: 002b:00007ffff79d9238 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f06220eff53
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000100000000
R10: 0000000000000012 R11: 0000000000000246 R12: 00007ffff79d925c
R13: 00007ffff79d9270 R14: 00007ffff79d92b0 R15: 0000000000000000
 </TASK>

Allocated by task 3613:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380
 kmalloc include/linux/slab.h:576 [inline]
 kzalloc include/linux/slab.h:712 [inline]
 vgem_gem_create_object+0x38/0xb0 drivers/gpu/drm/vgem/vgem_drv.c:98
 __drm_gem_shmem_create+0x80/0x480 drivers/gpu/drm/drm_gem_shmem_helper.c:62
 drm_gem_shmem_create drivers/gpu/drm/drm_gem_shmem_helper.c:127 [inline]
 drm_gem_shmem_create_with_handle drivers/gpu/drm/drm_gem_shmem_helper.c:424 [inline]
 drm_gem_shmem_dumb_create+0x13c/0x380 drivers/gpu/drm/drm_gem_shmem_helper.c:534
 drm_mode_create_dumb+0x26c/0x2f0 drivers/gpu/drm/drm_dumb_buffers.c:96
 drm_ioctl_kernel+0x27d/0x4e0 drivers/gpu/drm/drm_ioctl.c:788
 drm_ioctl+0x3e2/0xa30 drivers/gpu/drm/drm_ioctl.c:891
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 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+0x63/0xcd

Freed by task 3613:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0xab/0x3b0 mm/slub.c:3674
 drm_gem_object_free drivers/gpu/drm/drm_gem.c:961 [inline]
 kref_put include/linux/kref.h:65 [inline]
 __drm_gem_object_put include/drm/drm_gem.h:430 [inline]
 drm_gem_object_put include/drm/drm_gem.h:443 [inline]
 drm_gem_mmap+0x4f6/0x770 drivers/gpu/drm/drm_gem.c:1121
 call_mmap include/linux/fs.h:2196 [inline]
 mmap_region+0x6bf/0x1c00 mm/mmap.c:2625
 do_mmap+0x825/0xf50 mm/mmap.c:1412
 vm_mmap_pgoff+0x1ab/0x270 mm/util.c:520
 ksys_mmap_pgoff+0x41b/0x5a0 mm/mmap.c:1458
 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+0x63/0xcd

The buggy address belongs to the object at ffff8880779a8800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 488 bytes inside of
 1024-byte region [ffff8880779a8800, ffff8880779a8c00)

The buggy address belongs to the physical page:
page:ffffea0001de6a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x779a8
head:ffffea0001de6a00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011841dc0
raw: 0000000000000000 0000000080100010 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), pid 3612, tgid 3612 (syz-executor213), ts 42629407432, free_ts 37326106700
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4287
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5554
 __alloc_pages_node include/linux/gfp.h:223 [inline]
 alloc_slab_page mm/slub.c:1796 [inline]
 allocate_slab+0x80/0x300 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3180
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x191/0x3e0 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc_node+0x47/0xc0 mm/slab_common.c:962
 kmalloc_array_node include/linux/slab.h:689 [inline]
 kcalloc_node include/linux/slab.h:694 [inline]
 memcg_alloc_slab_cgroups+0x8b/0x140 mm/memcontrol.c:2885
 memcg_slab_post_alloc_hook+0xaa/0x480 mm/slab.h:528
 slab_post_alloc_hook mm/slab.h:745 [inline]
 slab_alloc_node mm/slub.c:3398 [inline]
 __kmem_cache_alloc_node+0x1df/0x3e0 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc+0x44/0xc0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:581 [inline]
 kzalloc include/linux/slab.h:712 [inline]
 lsm_cred_alloc security/security.c:540 [inline]
 security_prepare_creds+0x10e/0x190 security/security.c:1705
 prepare_creds+0x56e/0x7b0 kernel/cred.c:291
 copy_creds+0xa3/0xd40 kernel/cred.c:365
 copy_process+0xfbb/0x7190 kernel/fork.c:2113
 kernel_clone+0xe7/0x980 kernel/fork.c:2671
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1458 [inline]
 free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508
 free_unref_page_prepare mm/page_alloc.c:3386 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2586
 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+0x62/0x80 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:737 [inline]
 slab_alloc_node mm/slub.c:3398 [inline]
 kmem_cache_alloc_node+0x1be/0x400 mm/slub.c:3443
 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:497
 alloc_skb include/linux/skbuff.h:1267 [inline]
 alloc_skb_with_frags+0x93/0x6c0 net/core/skbuff.c:6124
 sock_alloc_send_pskb+0x7a3/0x930 net/core/sock.c:2719
 unix_dgram_sendmsg+0x415/0x1b50 net/unix/af_unix.c:1943
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 sock_write_iter+0x291/0x3d0 net/socket.c:1108
 call_write_iter include/linux/fs.h:2191 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9e9/0xdd0 fs/read_write.c:584
 ksys_write+0x1e8/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:
 ffff8880779a8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880779a8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880779a8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8880779a8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880779a8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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