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Fri, 10 May 2019 12:57:04 -0700 (PDT) Date: Fri, 10 May 2019 12:57:04 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000086510e05888df8c8@google.com> Subject: KASAN: slab-out-of-bounds Write in usb_get_bos_descriptor From: syzbot To: andreyknvl@google.com, gregkh@linuxfoundation.org, gustavo@embeddedor.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, suwan.kim027@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 43151d6c usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=124794d8a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4183eeef650d1234 dashboard link: https://syzkaller.appspot.com/bug?extid=71f1e64501a309fcc012 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=176a53d0a00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+71f1e64501a309fcc012@syzkaller.appspotmail.com usb 1-1: Using ep0 maxpacket: 8 ================================================================== BUG: KASAN: slab-out-of-bounds in usb_get_bos_descriptor+0x8be/0x8fb drivers/usb/core/config.c:976 Write of size 1 at addr ffff8880a48e38ec by task kworker/0:2/533 CPU: 0 PID: 533 Comm: kworker/0:2 Not tainted 5.1.0-rc3-319004-g43151d6 #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xe8/0x16e lib/dump_stack.c:113 print_address_description+0x6c/0x236 mm/kasan/report.c:187 kasan_report.cold+0x1a/0x3c mm/kasan/report.c:317 usb_get_bos_descriptor+0x8be/0x8fb drivers/usb/core/config.c:976 hub_port_init+0x1671/0x2d30 drivers/usb/core/hub.c:4828 hub_port_connect drivers/usb/core/hub.c:5021 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x11b8/0x3b00 drivers/usb/core/hub.c:5432 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 533: set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:470 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:742 [inline] usb_get_bos_descriptor+0x1e2/0x8fb drivers/usb/core/config.c:955 hub_port_init+0x1671/0x2d30 drivers/usb/core/hub.c:4828 hub_port_connect drivers/usb/core/hub.c:5021 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x11b8/0x3b00 drivers/usb/core/hub.c:5432 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 16: set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459 slab_free_hook mm/slub.c:1429 [inline] slab_free_freelist_hook+0x5e/0x140 mm/slub.c:1456 slab_free mm/slub.c:3003 [inline] kfree+0xce/0x290 mm/slub.c:3958 security_cred_free+0xa7/0x100 security/security.c:1498 put_cred_rcu+0x78/0x310 kernel/cred.c:118 __rcu_reclaim kernel/rcu/rcu.h:227 [inline] rcu_do_batch kernel/rcu/tree.c:2475 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline] rcu_core+0x83b/0x1a80 kernel/rcu/tree.c:2769 __do_softirq+0x22a/0x8cd kernel/softirq.c:293 The buggy address belongs to the object at ffff8880a48e38e8 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 4 bytes inside of 8-byte region [ffff8880a48e38e8, ffff8880a48e38f0) The buggy address belongs to the page: page:ffffea00029238c0 count:1 mapcount:0 mapping:ffff88812c3f5c00 index:0xffff8880a48e3c90 flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea000297f6c0 0000001600000016 ffff88812c3f5c00 raw: ffff8880a48e3c90 0000000080aa00a2 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a48e3780: fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb ffff8880a48e3800: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc > ffff8880a48e3880: fc fb fc fc fb fc fc fb fc fc fb fc fc 01 fc fc ^ ffff8880a48e3900: fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb ffff8880a48e3980: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb 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@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches