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Date: Mon, 26 Feb 2024 01:38:01 -0800
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Subject: Re: [syzbot] [rdma?] KASAN: slab-use-after-free Read in rdma_resolve_route
From: syzbot <syzbot+a2e2735f09ebb9d95bd1@syzkaller.appspotmail.com>
To: yanjun.zhu@linux.dev
Cc: yanjun.zhu@linux.dev, linux-kernel@vger.kernel.org, 
	syzkaller-bugs@googlegroups.com
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> #syz test: https://github.com/zhuyj/linux.git linux_6.8_rc4_rdma_cm

This crash does not have a reproducer. I cannot test it.

>
> =E5=9C=A8 2024/2/23 18:51, syzbot =E5=86=99=E9=81=93:
>> Hello,
>>=20
>> syzbot found the following issue on:
>>=20
>> HEAD commit:    2c3b09aac00d Add linux-next specific files for 20240214
>> git tree:       linux-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=3D1793a0641800=
00
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=3D176d2dcbf8ba=
7017
>> dashboard link: https://syzkaller.appspot.com/bug?extid=3Da2e2735f09ebb9=
d95bd1
>> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for De=
bian) 2.40
>>=20
>> Unfortunately, I don't have any reproducer for this issue yet.
>>=20
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/ac51042b61c6/di=
sk-2c3b09aa.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/012344301c35/vmlin=
ux-2c3b09aa.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/cba3c3e5cd7c/=
bzImage-2c3b09aa.xz
>>=20
>> IMPORTANT: if you fix the issue, please add the following tag to the com=
mit:
>> Reported-by: syzbot+a2e2735f09ebb9d95bd1@syzkaller.appspotmail.com
>>=20
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> BUG: KASAN: slab-use-after-free in compare_netdev_and_ip drivers/infinib=
and/core/cma.c:473 [inline]
>> BUG: KASAN: slab-use-after-free in cma_add_id_to_tree drivers/infiniband=
/core/cma.c:513 [inline]
>> BUG: KASAN: slab-use-after-free in rdma_resolve_route+0x23f7/0x3150 driv=
ers/infiniband/core/cma.c:3379
>> Read of size 4 at addr ffff88808dcf6184 by task syz-executor.4/11929
>>=20
>> CPU: 1 PID: 11929 Comm: syz-executor.4 Not tainted 6.8.0-rc4-next-202402=
14-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS =
Google 01/25/2024
>> 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
>>   compare_netdev_and_ip drivers/infiniband/core/cma.c:473 [inline]
>>   cma_add_id_to_tree drivers/infiniband/core/cma.c:513 [inline]
>>   rdma_resolve_route+0x23f7/0x3150 drivers/infiniband/core/cma.c:3379
>>   ucma_resolve_route+0x1ba/0x330 drivers/infiniband/core/ucma.c:745
>>   ucma_write+0x2df/0x430 drivers/infiniband/core/ucma.c:1743
>>   vfs_write+0x2a4/0xcb0 fs/read_write.c:588
>>   ksys_write+0x1a0/0x2c0 fs/read_write.c:643
>>   do_syscall_64+0xfb/0x240
>>   entry_SYSCALL_64_after_hwframe+0x6d/0x75
>> RIP: 0033:0x7f4eae47dda9
>> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 f=
f ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
>> RSP: 002b:00007f4eaf2cd0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
>> RAX: ffffffffffffffda RBX: 00007f4eae5abf80 RCX: 00007f4eae47dda9
>> RDX: 0000000000000010 RSI: 0000000020000440 RDI: 0000000000000003
>> RBP: 00007f4eae4ca47a R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
>> R13: 000000000000000b R14: 00007f4eae5abf80 R15: 00007fff93bb3dc8
>>   </TASK>
>>=20
>> Allocated by task 11919:
>>   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]
>>   kmalloc_trace+0x1d9/0x360 mm/slub.c:4013
>>   kmalloc include/linux/slab.h:590 [inline]
>>   kzalloc include/linux/slab.h:711 [inline]
>>   __rdma_create_id+0x65/0x590 drivers/infiniband/core/cma.c:993
>>   rdma_create_user_id+0x83/0xc0 drivers/infiniband/core/cma.c:1049
>>   ucma_create_id+0x2d0/0x500 drivers/infiniband/core/ucma.c:463
>>   ucma_write+0x2df/0x430 drivers/infiniband/core/ucma.c:1743
>>   vfs_write+0x2a4/0xcb0 fs/read_write.c:588
>>   ksys_write+0x1a0/0x2c0 fs/read_write.c:643
>>   do_syscall_64+0xfb/0x240
>>   entry_SYSCALL_64_after_hwframe+0x6d/0x75
>>=20
>> Freed by task 11915:
>>   kasan_save_stack mm/kasan/common.c:47 [inline]
>>   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
>>   kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:586
>>   poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
>>   __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
>>   kasan_slab_free include/linux/kasan.h:184 [inline]
>>   slab_free_hook mm/slub.c:2122 [inline]
>>   slab_free mm/slub.c:4296 [inline]
>>   kfree+0x14a/0x380 mm/slub.c:4406
>>   ucma_close_id drivers/infiniband/core/ucma.c:186 [inline]
>>   ucma_destroy_private_ctx+0x14e/0xc10 drivers/infiniband/core/ucma.c:57=
8
>>   ucma_close+0xfc/0x170 drivers/infiniband/core/ucma.c:1808
>>   __fput+0x429/0x8a0 fs/file_table.c:411
>>   __do_sys_close fs/open.c:1557 [inline]
>>   __se_sys_close fs/open.c:1542 [inline]
>>   __x64_sys_close+0x7f/0x110 fs/open.c:1542
>>   do_syscall_64+0xfb/0x240
>>   entry_SYSCALL_64_after_hwframe+0x6d/0x75
>>=20
>> The buggy address belongs to the object at ffff88808dcf6000
>>   which belongs to the cache kmalloc-2k of size 2048
>> The buggy address is located 388 bytes inside of
>>   freed 2048-byte region [ffff88808dcf6000, ffff88808dcf6800)
>>=20
>> The buggy address belongs to the physical page:
>> page:ffffea0002373c00 refcount:1 mapcount:0 mapping:0000000000000000 ind=
ex:0x0 pfn:0x8dcf0
>> head:ffffea0002373c00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincou=
nt:0
>> flags: 0xfff80000000840(slab|head|node=3D0|zone=3D1|lastcpupid=3D0xfff)
>> page_type: 0xffffffff()
>> raw: 00fff80000000840 ffff888014c42000 dead000000000100 dead000000000122
>> raw: 0000000000000000 0000000000080008 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 0xd20c0=
(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC),=
 pid 5149, tgid 5149 (kworker/1:4), ts 205905084555, free_ts 0
>>   set_page_owner include/linux/page_owner.h:31 [inline]
>>   post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
>>   prep_new_page mm/page_alloc.c:1540 [inline]
>>   get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
>>   __alloc_pages+0x256/0x6a0 mm/page_alloc.c:4567
>>   __alloc_pages_node include/linux/gfp.h:238 [inline]
>>   alloc_pages_node include/linux/gfp.h:261 [inline]
>>   alloc_slab_page+0x5f/0x160 mm/slub.c:2191
>>   allocate_slab mm/slub.c:2354 [inline]
>>   new_slab+0x84/0x2f0 mm/slub.c:2407
>>   ___slab_alloc+0xc73/0x1260 mm/slub.c:3541
>>   __slab_alloc mm/slub.c:3626 [inline]
>>   __slab_alloc_node mm/slub.c:3679 [inline]
>>   slab_alloc_node mm/slub.c:3851 [inline]
>>   __do_kmalloc_node mm/slub.c:3981 [inline]
>>   __kmalloc_node_track_caller+0x2d4/0x4e0 mm/slub.c:4002
>>   kmalloc_reserve+0xf3/0x260 net/core/skbuff.c:582
>>   __alloc_skb+0x1b1/0x420 net/core/skbuff.c:651
>>   alloc_skb include/linux/skbuff.h:1296 [inline]
>>   alloc_skb_with_frags+0xc3/0x780 net/core/skbuff.c:6394
>>   sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2794
>>   sock_alloc_send_skb include/net/sock.h:1855 [inline]
>>   mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746
>>   add_grhead net/ipv6/mcast.c:1849 [inline]
>>   add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1987
>>   mld_send_cr net/ipv6/mcast.c:2113 [inline]
>>   mld_ifc_work+0x6bf/0xb30 net/ipv6/mcast.c:2650
>>   process_one_work kernel/workqueue.c:3146 [inline]
>>   process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3226
>>   worker_thread+0x86d/0xd70 kernel/workqueue.c:3307
>> page_owner free stack trace missing
>>=20
>> Memory state around the buggy address:
>>   ffff88808dcf6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>   ffff88808dcf6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>> ffff88808dcf6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>                     ^
>>   ffff88808dcf6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>   ffff88808dcf6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>=20
>>=20
>> ---
>> This report is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@googlegroups.com.
>>=20
>> syzbot will keep track of this issue. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>>=20
>> If the report is already addressed, let syzbot know by replying with:
>> #syz fix: exact-commit-title
>>=20
>> If you want to overwrite report's subsystems, reply with:
>> #syz set subsystems: new-subsystem
>> (See the list of subsystem names on the web dashboard)
>>=20
>> If the report is a duplicate of another one, reply with:
>> #syz dup: exact-subject-of-another-report
>>=20
>> If you want to undo deduplication, reply with:
>> #syz undup
>