Message-ID:
 <BN8PR15MB251302BDC48D4B001F6A540E99D82@BN8PR15MB2513.namprd15.prod.outlook.com>
Date: Thu, 20 Mar 2025 15:45:57 +0000
From: Bernard Metzler <BMT@...ich.ibm.com>
To: Zhu Yanjun <yanjun.zhu@...ux.dev>,
        syzbot
	<syzbot+17fb1664c4f5a2eeb36f@...kaller.appspotmail.com>,
        "jgg@...pe.ca"
	<jgg@...pe.ca>, "leon@...nel.org" <leon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: RE: [syzbot] [rdma?] KASAN: slab-use-after-free Read in ib_device_uevent
 (2)



> -----Original Message-----
> From: Zhu Yanjun <yanjun.zhu@...ux.dev>
> Sent: Thursday, March 20, 2025 9:41 AM
> To: syzbot <syzbot+17fb1664c4f5a2eeb36f@...kaller.appspotmail.com>;
> jgg@...pe.ca; leon@...nel.org; linux-kernel@...r.kernel.org; linux-
> rdma@...r.kernel.org; netdev@...r.kernel.org; syzkaller-
> bugs@...glegroups.com
> Subject: [EXTERNAL] Re: [syzbot] [rdma?] KASAN: slab-use-after-free Read in
> ib_device_uevent (2)
> 
> On 16.02.25 22:55, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    09fbf3d50205 Merge tag 'tomoyo-pr-20250211' of
> git://git.c..
> > git tree:       upstream
> > console output: https% 
> 3A__syzkaller.appspot.com_x_log.txt-3Fx-
> 3D140563f8580000&d=DwICaQ&c=BSDicqBQBDjDI9RkVyTcHQ&r=4ynb4Sj_4MUcZXbhvovE4t
> YSbqxyOwdSiLedP4yO55g&m=srgskMI0sa3T0mS2H_izLLDgZ1Sh2TpNoxBofzPAozKcJ4gPxEc
> BAbeCqJelsb3Q&s=4HoaGCofTzC69mNNZLu7urW39zt-qZ0jHEwjCNq3e9Y&e=
> > kernel config:  https% 
> 3A__syzkaller.appspot.com_x_.config-3Fx-
> 3D641fe3e3cfee64bb&d=DwICaQ&c=BSDicqBQBDjDI9RkVyTcHQ&r=4ynb4Sj_4MUcZXbhvovE
> 4tYSbqxyOwdSiLedP4yO55g&m=srgskMI0sa3T0mS2H_izLLDgZ1Sh2TpNoxBofzPAozKcJ4gPx
> EcBAbeCqJelsb3Q&s=jAjZbjn-w2sZsfK2gPXlLFltAGHvZLQFzWfk1TvVDc8&e=
> > dashboard link: https% 
> 3A__syzkaller.appspot.com_bug-3Fextid-
> 3D17fb1664c4f5a2eeb36f&d=DwICaQ&c=BSDicqBQBDjDI9RkVyTcHQ&r=4ynb4Sj_4MUcZXbh
> vovE4tYSbqxyOwdSiLedP4yO55g&m=srgskMI0sa3T0mS2H_izLLDgZ1Sh2TpNoxBofzPAozKcJ
> 4gPxEcBAbeCqJelsb3Q&s=5B7eaLwpVQ_61Ux3yGd2CKLvh-uQsJf4-9v4bbRC0uk&e=
> > compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for
> Debian) 2.40
> >
> > Unfortunately, I don't have any reproducer for this issue yet.
> >
> > Downloadable assets:
> > disk image (non-bootable):
> https% 
> 3A__storage.googleapis.com_syzbot-2Dassets_7feb34a89c2a_non-5Fbootable-
> 5Fdisk-
> 2D09fbf3d5.raw.xz&d=DwICaQ&c=BSDicqBQBDjDI9RkVyTcHQ&r=4ynb4Sj_4MUcZXbhvovE4
> tYSbqxyOwdSiLedP4yO55g&m=srgskMI0sa3T0mS2H_izLLDgZ1Sh2TpNoxBofzPAozKcJ4gPxE
> cBAbeCqJelsb3Q&s=hw8G10Pj-FRcaJZfChWmSKE8GaozuUeI85UvisfTHEQ&e=
> > vmlinux: https% 
> 3A__storage.googleapis.com_syzbot-2Dassets_31b409a4b675_vmlinux-
> 2D09fbf3d5.xz&d=DwICaQ&c=BSDicqBQBDjDI9RkVyTcHQ&r=4ynb4Sj_4MUcZXbhvovE4tYSb
> qxyOwdSiLedP4yO55g&m=srgskMI0sa3T0mS2H_izLLDgZ1Sh2TpNoxBofzPAozKcJ4gPxEcBAb
> eCqJelsb3Q&s=Ih8IyDMEvy9jwvc2noeIX5E0FgZRM8D2RmxTNE3nih4&e=
> > kernel image: https% 
> 3A__storage.googleapis.com_syzbot-2Dassets_27f349d4d8cb_bzImage-
> 2D09fbf3d5.xz&d=DwICaQ&c=BSDicqBQBDjDI9RkVyTcHQ&r=4ynb4Sj_4MUcZXbhvovE4tYSb
> qxyOwdSiLedP4yO55g&m=srgskMI0sa3T0mS2H_izLLDgZ1Sh2TpNoxBofzPAozKcJ4gPxEcBAb
> eCqJelsb3Q&s=PMgqb590AII6znT2g--1TKjjkadAlznJi0aFX-v9Pnw&e=
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the
> commit:
> > Reported-by: syzbot+17fb1664c4f5a2eeb36f@...kaller.appspotmail.com
> 
> To this problem, I just looked through this problem which occurred on
> iwarp. I remember a similar problem which occurred on rxe.
> To the problem on rxe, the solution
> https% 
> 3A__patchwork.kernel.org_project_linux-2Drdma_patch_20250313092421.944658-
> 2D1-2Dwangliang74-
> 40huawei.com_&d=DwICaQ&c=BSDicqBQBDjDI9RkVyTcHQ&r=4ynb4Sj_4MUcZXbhvovE4tYSb
> qxyOwdSiLedP4yO55g&m=srgskMI0sa3T0mS2H_izLLDgZ1Sh2TpNoxBofzPAozKcJ4gPxEcBAb
> eCqJelsb3Q&s=YC4HmD2kVw28DToigJwJRY1U8oNFfvQgMF2S5wpatak&e=
> seems to be able to fix it.
> 
> I am not sure if this problem can also be fixed by the above solution or
> not.
> 

I would assume yes. The stack trace is very similar.

Thanks,
Bernard.

> Best Regards,
> Zhu Yanjun
> 
> >
> > ==================================================================
> > BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:632
> [inline]
> > BUG: KASAN: slab-use-after-free in string+0x4a6/0x4f0 lib/vsprintf.c:714
> > Read of size 1 at addr ffff88803e895ea0 by task udevd/6903
> >
> > CPU: 1 UID: 0 PID: 6903 Comm: udevd Not tainted 6.14.0-rc2-syzkaller-
> 00039-g09fbf3d50205 #0
> > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-
> 1.16.3-2~bpo12+1 04/01/2014
> > Call Trace:
> >   <TASK>
> >   __dump_stack lib/dump_stack.c:94 [inline]
> >   dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
> >   print_address_description mm/kasan/report.c:378 [inline]
> >   print_report+0xc3/0x620 mm/kasan/report.c:489
> >   kasan_report+0xd9/0x110 mm/kasan/report.c:602
> >   string_nocheck lib/vsprintf.c:632 [inline]
> >   string+0x4a6/0x4f0 lib/vsprintf.c:714
> >   vsnprintf+0x4c8/0x1180 lib/vsprintf.c:2843
> >   add_uevent_var+0x17c/0x3a0 lib/kobject_uevent.c:679
> >   ib_device_uevent+0x4e/0xb0 drivers/infiniband/core/device.c:502
> >   dev_uevent+0x28b/0x770 drivers/base/core.c:2673
> >   uevent_show+0x1d8/0x3b0 drivers/base/core.c:2731
> >   dev_attr_show+0x53/0xe0 drivers/base/core.c:2423
> >   sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59
> >   seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230
> >   kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279
> >   new_sync_read fs/read_write.c:484 [inline]
> >   vfs_read+0x886/0xbf0 fs/read_write.c:565
> >   ksys_read+0x12b/0x250 fs/read_write.c:708
> >   do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >   do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> >   entry_SYSCALL_64_after_hwframe+0x77/0x7f
> > RIP: 0033:0x7f7681378b6a
> > Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31
> c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0
> ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
> > RSP: 002b:00007ffcbdf9d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> > RAX: ffffffffffffffda RBX: 000055efbec7de20 RCX: 00007f7681378b6a
> > RDX: 0000000000001000 RSI: 000055efbeca9490 RDI: 0000000000000008
> > RBP: 000055efbec7de20 R08: 0000000000000008 R09: 0000000000020000
> > R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
> > R13: 0000000000003fff R14: 00007ffcbdf9d518 R15: 000000000000000a
> >   </TASK>
> >
> > Allocated by task 12483:
> >   kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
> >   kasan_save_track+0x14/0x30 mm/kasan/common.c:68
> >   poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
> >   __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
> >   kasan_kmalloc include/linux/kasan.h:260 [inline]
> >   __do_kmalloc_node mm/slub.c:4294 [inline]
> >   __kmalloc_node_track_caller_noprof+0x222/0x510 mm/slub.c:4313
> >   __kmemdup_nul mm/util.c:61 [inline]
> >   kstrdup+0x53/0x100 mm/util.c:81
> >   kstrdup_const+0x63/0x80 mm/util.c:101
> >   kvasprintf_const+0x164/0x1a0 lib/kasprintf.c:46
> >   kobject_set_name_vargs+0x5a/0x140 lib/kobject.c:274
> >   dev_set_name+0xc8/0x100 drivers/base/core.c:3468
> >   assign_name drivers/infiniband/core/device.c:1202 [inline]
> >   ib_register_device+0x7e0/0xdf0 drivers/infiniband/core/device.c:1384
> >   siw_device_register drivers/infiniband/sw/siw/siw_main.c:72 [inline]
> >   siw_newlink drivers/infiniband/sw/siw/siw_main.c:431 [inline]
> >   siw_newlink+0xb60/0xd70 drivers/infiniband/sw/siw/siw_main.c:413
> >   nldev_newlink+0x38e/0x660 drivers/infiniband/core/nldev.c:1795
> >   rdma_nl_rcv_msg+0x388/0x6e0 drivers/infiniband/core/netlink.c:195
> >   rdma_nl_rcv_skb.constprop.0.isra.0+0x2e6/0x450
> drivers/infiniband/core/netlink.c:239
> >   netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
> >   netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348
> >   netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892
> >   sock_sendmsg_nosec net/socket.c:718 [inline]
> >   __sock_sendmsg net/socket.c:733 [inline]
> >   ____sys_sendmsg+0xaaf/0xc90 net/socket.c:2573
> >   ___sys_sendmsg+0x135/0x1e0 net/socket.c:2627
> >   __sys_sendmsg+0x16e/0x220 net/socket.c:2659
> >   do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >   do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> >   entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > Freed by task 12485:
> >   kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
> >   kasan_save_track+0x14/0x30 mm/kasan/common.c:68
> >   kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
> >   poison_slab_object mm/kasan/common.c:247 [inline]
> >   __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
> >   kasan_slab_free include/linux/kasan.h:233 [inline]
> >   slab_free_hook mm/slub.c:2353 [inline]
> >   slab_free mm/slub.c:4609 [inline]
> >   kfree+0x2c4/0x4d0 mm/slub.c:4757
> >   kfree_const+0x55/0x60 mm/util.c:43
> >   kobject_rename+0x179/0x260 lib/kobject.c:524
> >   device_rename+0x130/0x230 drivers/base/core.c:4525
> >   ib_device_rename+0x114/0x5c0 drivers/infiniband/core/device.c:402
> >   nldev_set_doit+0x3be/0x4c0 drivers/infiniband/core/nldev.c:1146
> >   rdma_nl_rcv_msg+0x388/0x6e0 drivers/infiniband/core/netlink.c:195
> >   rdma_nl_rcv_skb.constprop.0.isra.0+0x2e6/0x450
> drivers/infiniband/core/netlink.c:239
> >   netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
> >   netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348
> >   netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892
> >   sock_sendmsg_nosec net/socket.c:718 [inline]
> >   __sock_sendmsg net/socket.c:733 [inline]
> >   ____sys_sendmsg+0xaaf/0xc90 net/socket.c:2573
> >   ___sys_sendmsg+0x135/0x1e0 net/socket.c:2627
> >   __sys_sendmsg+0x16e/0x220 net/socket.c:2659
> >   do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >   do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> >   entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > The buggy address belongs to the object at ffff88803e895ea0
> >   which belongs to the cache kmalloc-8 of size 8
> > The buggy address is located 0 bytes inside of
> >   freed 8-byte region [ffff88803e895ea0, ffff88803e895ea8)
> >
> > The buggy address belongs to the physical page:
> > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
> pfn:0x3e895
> > flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
> > page_type: f5(slab)
> > raw: 00fff00000000000 ffff88801b042500 ffffea0000a05a00 dead000000000002
> > raw: 0000000000000000 0000000000800080 00000000f5000000 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
> 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11986, tgid
> 11985 (syz.1.1513), ts 150711065425, free_ts 150704805794
> >   set_page_owner include/linux/page_owner.h:32 [inline]
> >   post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551
> >   prep_new_page mm/page_alloc.c:1559 [inline]
> >   get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477
> >   __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739
> >   alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270
> >   alloc_slab_page mm/slub.c:2423 [inline]
> >   allocate_slab mm/slub.c:2587 [inline]
> >   new_slab+0x23d/0x330 mm/slub.c:2640
> >   ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826
> >   __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916
> >   __slab_alloc_node mm/slub.c:3991 [inline]
> >   slab_alloc_node mm/slub.c:4152 [inline]
> >   __do_kmalloc_node mm/slub.c:4293 [inline]
> >   __kmalloc_node_noprof+0x2f0/0x510 mm/slub.c:4300
> >   __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:662
> >   kvmalloc_array_node_noprof include/linux/slab.h:1063 [inline]
> >   __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:471
> [inline]
> >   ptr_ring_resize_multiple_bh_noprof include/linux/ptr_ring.h:634
> [inline]
> >   skb_array_resize_multiple_bh_noprof include/linux/skb_array.h:208
> [inline]
> >   pfifo_fast_change_tx_queue_len+0x157/0xbb0 net/sched/sch_generic.c:909
> >   qdisc_change_tx_queue_len net/sched/sch_generic.c:1410 [inline]
> >   dev_qdisc_change_tx_queue_len+0x166/0x380 net/sched/sch_generic.c:1457
> >   dev_change_tx_queue_len+0x1a3/0x1e0 net/core/dev.c:9362
> >   dev_ifsioc+0xdfe/0x10d0 net/core/dev_ioctl.c:608
> >   dev_ioctl+0x224/0x10c0 net/core/dev_ioctl.c:826
> >   sock_do_ioctl+0x19e/0x280 net/socket.c:1213
> >   sock_ioctl+0x228/0x6c0 net/socket.c:1318
> > page last free pid 11986 tgid 11985 stack trace:
> >   reset_page_owner include/linux/page_owner.h:25 [inline]
> >   free_pages_prepare mm/page_alloc.c:1127 [inline]
> >   free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660
> >   __put_partials+0x14c/0x170 mm/slub.c:3153
> >   qlink_free mm/kasan/quarantine.c:163 [inline]
> >   qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
> >   kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
> >   __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
> >   kasan_slab_alloc include/linux/kasan.h:250 [inline]
> >   slab_post_alloc_hook mm/slub.c:4115 [inline]
> >   slab_alloc_node mm/slub.c:4164 [inline]
> >   __kmalloc_cache_noprof+0x243/0x410 mm/slub.c:4320
> >   kmalloc_noprof include/linux/slab.h:901 [inline]
> >   kmalloc_array_noprof include/linux/slab.h:945 [inline]
> >   ptr_ring_resize_multiple_bh_noprof include/linux/ptr_ring.h:629
> [inline]
> >   skb_array_resize_multiple_bh_noprof include/linux/skb_array.h:208
> [inline]
> >   pfifo_fast_change_tx_queue_len+0xe1/0xbb0 net/sched/sch_generic.c:909
> >   qdisc_change_tx_queue_len net/sched/sch_generic.c:1410 [inline]
> >   dev_qdisc_change_tx_queue_len+0x166/0x380 net/sched/sch_generic.c:1457
> >   dev_change_tx_queue_len+0x1a3/0x1e0 net/core/dev.c:9362
> >   dev_ifsioc+0xdfe/0x10d0 net/core/dev_ioctl.c:608
> >   dev_ioctl+0x224/0x10c0 net/core/dev_ioctl.c:826
> >   sock_do_ioctl+0x19e/0x280 net/socket.c:1213
> >   sock_ioctl+0x228/0x6c0 net/socket.c:1318
> >   vfs_ioctl fs/ioctl.c:51 [inline]
> >   __do_sys_ioctl fs/ioctl.c:906 [inline]
> >   __se_sys_ioctl fs/ioctl.c:892 [inline]
> >   __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
> >   do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >   do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> >   entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > Memory state around the buggy address:
> >   ffff88803e895d80: 05 fc fc fc fa fc fc fc 05 fc fc fc fa fc fc fc
> >   ffff88803e895e00: 05 fc fc fc 00 fc fc fc 05 fc fc fc fa fc fc fc
> >> ffff88803e895e80: 05 fc fc fc fa fc fc fc 05 fc fc fc 00 fc fc fc
> >                                 ^
> >   ffff88803e895f00: 05 fc fc fc 05 fc fc fc 05 fc fc fc fa fc fc fc
> >   ffff88803e895f80: 05 fc fc fc 00 fc fc fc 05 fc fc fc fa fc fc fc
> > ==================================================================
> >
> >
> > ---
> > This report is generated by a bot. It may contain errors.
> > See https% 
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> tYSbqxyOwdSiLedP4yO55g&m=srgskMI0sa3T0mS2H_izLLDgZ1Sh2TpNoxBofzPAozKcJ4gPxE
> cBAbeCqJelsb3Q&s=9KITFSQjSP-M8czK13OhII3KvAyuGKJaXzqd8UkFCUA&e=  for more
> information about syzbot.
> > syzbot engineers can be reached at syzkaller@...glegroups.com.
> >
> > syzbot will keep track of this issue. See:
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> lsb3Q&s=Jclx0sFtbIZqLvA1ZP_CtdN-lZHrwyGSFSAz6f8W4Ng&e=  for how to
> communicate with syzbot.
> >
> > If the report is already addressed, let syzbot know by replying with:
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> >
> > 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)
> >
> > If the report is a duplicate of another one, reply with:
> > #syz dup: exact-subject-of-another-report
> >
> > If you want to undo deduplication, reply with:
> > #syz undup
> 

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