On Wed, Sep 26, 2018 at 4:27 PM syzbot <syzbot+5013f86be1187ccf3800@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 846e8dd47c26 Merge tag 'scsi-fixes' of git://git.kernel.or.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=113cfbfa400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=dfb440e26f0a6f6f > dashboard link: https://syzkaller.appspot.com/bug?extid=5013f86be1187ccf3800 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > 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+5013f86be1187ccf3800@xxxxxxxxxxxxxxxxxxxxxxxxx > > binder: 12750:12764 transaction failed 29201/-71, size 0-8 line 2762 > audit: type=1326 audit(1537939130.796:20382): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=228 compat=0 > ip=0x45a3da code=0x50000 > ================================================================== > BUG: KASAN: use-after-free in rdma_resolve_addr+0x1e97/0x2730 > drivers/infiniband/core/cma.c:2981 > Read of size 2 at addr ffff88018529b1e0 by task syz-executor2/12772 This seems to have been fixed by: #syz fix: ucma: fix a use-after-free in ucma_resolve_ip() So let's close the bug. Pile of neglected bug reports is not too useful. > CPU: 1 PID: 12772 Comm: syz-executor2 Not tainted 4.19.0-rc5+ #254 > audit: type=1326 audit(1537939130.846:20383): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 > ip=0x457579 code=0x50000 > 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+0x1c4/0x2b4 lib/dump_stack.c:113 > print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 > __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431 > rdma_resolve_addr+0x1e97/0x2730 drivers/infiniband/core/cma.c:2981 > audit: type=1326 audit(1537939130.846:20384): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=228 compat=0 > ip=0x45a3da code=0x50000 > ucma_resolve_ip+0x242/0x2a0 drivers/infiniband/core/ucma.c:713 > ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1686 > audit: type=1326 audit(1537939130.866:20385): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=298 compat=0 > ip=0x457579 code=0x50000 > __vfs_write+0x119/0x9f0 fs/read_write.c:485 > audit: type=1326 audit(1537939130.866:20386): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=228 compat=0 > ip=0x45a3da code=0x50000 > vfs_write+0x1fc/0x560 fs/read_write.c:549 > ksys_write+0x101/0x260 fs/read_write.c:598 > __do_sys_write fs/read_write.c:610 [inline] > __se_sys_write fs/read_write.c:607 [inline] > __x64_sys_write+0x73/0xb0 fs/read_write.c:607 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > audit: type=1326 audit(1537939130.876:20387): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 > ip=0x457579 code=0x50000 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x457579 > Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > audit: type=1326 audit(1537939130.876:20388): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 > ip=0x457579 code=0x50000 > RSP: 002b:00007f451b87cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 > RDX: 0000000000000048 RSI: 0000000020000240 RDI: 0000000000000009 > RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f451b87d6d4 > R13: 00000000004cb6a0 R14: 00000000004d8cb8 R15: 00000000ffffffff > > binder: BINDER_SET_CONTEXT_MGR already set > Allocated by task 12777: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 > kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 > kmalloc include/linux/slab.h:513 [inline] > kzalloc include/linux/slab.h:707 [inline] > __rdma_create_id+0xdf/0x790 drivers/infiniband/core/cma.c:784 > ucma_create_id+0x39b/0x990 drivers/infiniband/core/ucma.c:504 > binder: 12750:12773 ioctl 40046207 0 returned -16 > ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1686 > __vfs_write+0x119/0x9f0 fs/read_write.c:485 > vfs_write+0x1fc/0x560 fs/read_write.c:549 > ksys_write+0x101/0x260 fs/read_write.c:598 > __do_sys_write fs/read_write.c:610 [inline] > __se_sys_write fs/read_write.c:607 [inline] > __x64_sys_write+0x73/0xb0 fs/read_write.c:607 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > audit: type=1326 audit(1537939130.886:20389): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 > ip=0x457579 code=0x50000 > Freed by task 12770: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 > __cache_free mm/slab.c:3498 [inline] > kfree+0xcf/0x230 mm/slab.c:3813 > rdma_destroy_id+0x835/0xcc0 drivers/infiniband/core/cma.c:1739 > ucma_close+0x100/0x300 drivers/infiniband/core/ucma.c:1765 > __fput+0x385/0xa30 fs/file_table.c:278 > ____fput+0x15/0x20 fs/file_table.c:309 > task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 > tracehook_notify_resume include/linux/tracehook.h:193 [inline] > exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 > audit: type=1326 audit(1537939130.926:20390): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 > ip=0x457579 code=0x50000 > prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] > syscall_return_slowpath arch/x86/entry/common.c:268 [inline] > do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > audit: type=1326 audit(1537939130.926:20391): auid=4294967295 uid=0 gid=0 > ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" > exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 > ip=0x457579 code=0x50000 > The buggy address belongs to the object at ffff88018529b1c0 > which belongs to the cache kmalloc-2048 of size 2048 > The buggy address is located 32 bytes inside of > 2048-byte region [ffff88018529b1c0, ffff88018529b9c0) > The buggy address belongs to the page: > page:ffffea000614a680 count:1 mapcount:0 mapping:ffff8801da800c40 > index:0xffff88018529a940 > binder: 12750:12764 ERROR: BC_REGISTER_LOOPER called without request > compound_mapcount: 0 > flags: 0x2fffc0000008100(slab|head) > raw: 02fffc0000008100 ffffea00061c4188 ffffea000632af08 ffff8801da800c40 > raw: ffff88018529a940 ffff88018529a0c0 0000000100000002 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff88018529b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88018529b100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > > ffff88018529b180: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb > ^ > ffff88018529b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88018529b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== > kobject: 'loop5' (000000002cf6e86e): kobject_uevent_env > > > --- > 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000002ad1ad0576c70475%40google.com. > For more options, visit https://groups.google.com/d/optout.
