linux-kernel - Re: KASAN: use-after-free Read in iwcm_deref

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20200228162108.GU31668@ziepe.ca>
Date:   Fri, 28 Feb 2020 12:21:08 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     syzbot <syzbot+cb0c054eabfba4342146@...kaller.appspotmail.com>
Cc:     bmt@...ich.ibm.com, dledford@...hat.com, kamalheib1@...il.com,
        krishna2@...lsio.com, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in iwcm_deref_id

On Tue, Feb 25, 2020 at 11:00:13PM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    f8788d86 Linux 5.6-rc3
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=164503d9e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
> dashboard link: https://syzkaller.appspot.com/bug?extid=cb0c054eabfba4342146
> compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> 
> Unfortunately, I don't have any reproducer for this crash yet.
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+cb0c054eabfba4342146@...kaller.appspotmail.com

#syz dup KASAN: use-after-free Read in rdma_listen (2)

> ==================================================================
> BUG: KASAN: use-after-free in dealloc_work_entries drivers/infiniband/core/iwcm.c:162 [inline]
> BUG: KASAN: use-after-free in free_cm_id drivers/infiniband/core/iwcm.c:202 [inline]
> BUG: KASAN: use-after-free in iwcm_deref_id+0xf6/0x170 drivers/infiniband/core/iwcm.c:215
> Read of size 8 at addr ffff8880a0d05978 by task syz-executor.2/15428
> 
> CPU: 1 PID: 15428 Comm: syz-executor.2 Not tainted 5.6.0-rc3-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1fb/0x318 lib/dump_stack.c:118
>  print_address_description+0x74/0x5c0 mm/kasan/report.c:374
>  __kasan_report+0x149/0x1c0 mm/kasan/report.c:506
>  kasan_report+0x26/0x50 mm/kasan/common.c:641
>  __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
>  dealloc_work_entries drivers/infiniband/core/iwcm.c:162 [inline]
>  free_cm_id drivers/infiniband/core/iwcm.c:202 [inline]
>  iwcm_deref_id+0xf6/0x170 drivers/infiniband/core/iwcm.c:215
>  destroy_cm_id+0x4b2/0x5b0 drivers/infiniband/core/iwcm.c:442
>  iw_destroy_cm_id+0x15/0x20 drivers/infiniband/core/iwcm.c:453
>  cma_iw_listen drivers/infiniband/core/cma.c:2453 [inline]
>  rdma_listen+0x6dc/0x9a0 drivers/infiniband/core/cma.c:3614
>  cma_listen_on_dev+0x678/0x8e0 drivers/infiniband/core/cma.c:2501
>  cma_listen_on_all drivers/infiniband/core/cma.c:2514 [inline]
>  rdma_listen+0x43b/0x9a0 drivers/infiniband/core/cma.c:3622
>  ucma_listen+0x245/0x300 drivers/infiniband/core/ucma.c:1092
>  ucma_write+0x2da/0x360 drivers/infiniband/core/ucma.c:1684
>  __vfs_write+0xb8/0x740 fs/read_write.c:494
>  vfs_write+0x270/0x580 fs/read_write.c:558
>  ksys_write+0x117/0x220 fs/read_write.c:611
>  __do_sys_write fs/read_write.c:623 [inline]
>  __se_sys_write fs/read_write.c:620 [inline]
>  __x64_sys_write+0x7b/0x90 fs/read_write.c:620
>  do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x45c449
> Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007fe499194c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
> RAX: ffffffffffffffda RBX: 00007fe4991956d4 RCX: 000000000045c449
> RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003
> RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
> R13: 0000000000000cbe R14: 00000000004cea14 R15: 0000000000000007
> 
> Allocated by task 15428:
>  save_stack mm/kasan/common.c:72 [inline]
>  set_track mm/kasan/common.c:80 [inline]
>  __kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:515
>  kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
>  kmem_cache_alloc_trace+0x221/0x2f0 mm/slab.c:3551
>  kmalloc include/linux/slab.h:555 [inline]
>  alloc_work_entries drivers/infiniband/core/iwcm.c:172 [inline]
>  iw_cm_listen+0xdd/0x4a0 drivers/infiniband/core/iwcm.c:571
>  cma_iw_listen drivers/infiniband/core/cma.c:2450 [inline]
>  rdma_listen+0x698/0x9a0 drivers/infiniband/core/cma.c:3614
>  cma_listen_on_dev+0x678/0x8e0 drivers/infiniband/core/cma.c:2501
>  cma_listen_on_all drivers/infiniband/core/cma.c:2514 [inline]
>  rdma_listen+0x43b/0x9a0 drivers/infiniband/core/cma.c:3622
>  ucma_listen+0x245/0x300 drivers/infiniband/core/ucma.c:1092
>  ucma_write+0x2da/0x360 drivers/infiniband/core/ucma.c:1684
>  __vfs_write+0xb8/0x740 fs/read_write.c:494
>  vfs_write+0x270/0x580 fs/read_write.c:558
>  ksys_write+0x117/0x220 fs/read_write.c:611
>  __do_sys_write fs/read_write.c:623 [inline]
>  __se_sys_write fs/read_write.c:620 [inline]
>  __x64_sys_write+0x7b/0x90 fs/read_write.c:620
>  do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> Freed by task 15428:
>  save_stack mm/kasan/common.c:72 [inline]
>  set_track mm/kasan/common.c:80 [inline]
>  kasan_set_free_info mm/kasan/common.c:337 [inline]
>  __kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:476
>  kasan_slab_free+0xe/0x10 mm/kasan/common.c:485
>  __cache_free mm/slab.c:3426 [inline]
>  kfree+0x10d/0x220 mm/slab.c:3757
>  dealloc_work_entries drivers/infiniband/core/iwcm.c:163 [inline]
>  alloc_work_entries drivers/infiniband/core/iwcm.c:174 [inline]
>  iw_cm_listen+0x288/0x4a0 drivers/infiniband/core/iwcm.c:571
>  cma_iw_listen drivers/infiniband/core/cma.c:2450 [inline]
>  rdma_listen+0x698/0x9a0 drivers/infiniband/core/cma.c:3614
>  cma_listen_on_dev+0x678/0x8e0 drivers/infiniband/core/cma.c:2501
>  cma_listen_on_all drivers/infiniband/core/cma.c:2514 [inline]
>  rdma_listen+0x43b/0x9a0 drivers/infiniband/core/cma.c:3622
>  ucma_listen+0x245/0x300 drivers/infiniband/core/ucma.c:1092
>  ucma_write+0x2da/0x360 drivers/infiniband/core/ucma.c:1684
>  __vfs_write+0xb8/0x740 fs/read_write.c:494
>  vfs_write+0x270/0x580 fs/read_write.c:558
>  ksys_write+0x117/0x220 fs/read_write.c:611
>  __do_sys_write fs/read_write.c:623 [inline]
>  __se_sys_write fs/read_write.c:620 [inline]
>  __x64_sys_write+0x7b/0x90 fs/read_write.c:620
>  do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> The buggy address belongs to the object at ffff8880a0d05800
>  which belongs to the cache kmalloc-512 of size 512
> The buggy address is located 376 bytes inside of
>  512-byte region [ffff8880a0d05800, ffff8880a0d05a00)
> The buggy address belongs to the page:
> page:ffffea0002834140 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0
> flags: 0xfffe0000000200(slab)
> raw: 00fffe0000000200 ffffea0001019988 ffffea000280e088 ffff8880aa400a80
> raw: 0000000000000000 ffff8880a0d05000 0000000100000004 0000000000000000
> page dumped because: kasan: bad access detected
> 
> Memory state around the buggy address:
>  ffff8880a0d05800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>  ffff8880a0d05880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >ffff8880a0d05900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>                                                                 ^
>  ffff8880a0d05980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>  ffff8880a0d05a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ==================================================================
> 
> 
> This bug 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@...glegroups.com.
> 
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.