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Mon, 12 Aug 2019 05:18:07 -0700 (PDT) Date: Mon, 12 Aug 2019 05:18:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003c013f058fea8493@google.com> Subject: KASAN: slab-out-of-bounds Read in ld_usb_read From: syzbot To: andreyknvl@google.com, bhelgaas@google.com, enric.balletbo@collabora.com, gregkh@linuxfoundation.org, kirr@nexedi.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux@roeck-us.net, lkundrak@v3.sk, logang@deltatee.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: e96407b4 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=162aac02600000 kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e dashboard link: https://syzkaller.appspot.com/bug?extid=ba00d6a2a24df57a94ca compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1123edc2600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16079d2c600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+ba00d6a2a24df57a94ca@syzkaller.appspotmail.com ldusb 1-1:0.28: Read buffer overflow, -131386046930688 bytes dropped ================================================================== BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x124/0x150 lib/usercopy.c:27 Read of size 2147479552 at addr ffff8881cd580008 by task syz-executor268/1890 CPU: 0 PID: 1890 Comm: syz-executor268 Not tainted 5.3.0-rc2+ #25 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+0xca/0x13e lib/dump_stack.c:113 print_address_description+0x6a/0x32c mm/kasan/report.c:351 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 kasan_report+0xe/0x12 mm/kasan/common.c:612 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x128/0x190 mm/kasan/generic.c:192 _copy_to_user+0x124/0x150 lib/usercopy.c:27 copy_to_user include/linux/uaccess.h:152 [inline] ld_usb_read+0x31a/0x780 drivers/usb/misc/ldusb.c:495 __vfs_read+0x76/0x100 fs/read_write.c:425 vfs_read+0x1ea/0x430 fs/read_write.c:461 ksys_read+0x1e8/0x250 fs/read_write.c:587 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441c49 Code: e8 8c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 cb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd920003d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c49 RDX: 00000000fffffd68 RSI: 0000000020000100 RDI: 0000000000000004 RBP: 00000000000305b5 R08: 000000000000000f R09: 0000000000402a30 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004029a0 R13: 0000000000402a30 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea0007356000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0 flags: 0x200000000010000(head) raw: 0200000000010000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cd595500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881cd595580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8881cd595600: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ ffff8881cd595680: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff8881cd595700: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ================================================================== --- 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