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Sun, 11 Aug 2019 13:46:06 -0700 (PDT) Date: Sun, 11 Aug 2019 13:46:06 -0700 In-Reply-To: <00000000000008b8c6058ee52407@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000016c09c058fdd7faa@google.com> Subject: Re: KASAN: slab-out-of-bounds Read in hidraw_ioctl From: syzbot To: andreyknvl@google.com, benjamin.tissoires@redhat.com, jikos@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, 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 syzbot has found a reproducer for 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=150426ba600000 kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e dashboard link: https://syzkaller.appspot.com/bug?extid=5a6c4ec678a0c6ee84ba compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12725c02600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162163c2600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+5a6c4ec678a0c6ee84ba@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in strlen+0x79/0x90 lib/string.c:525 Read of size 1 at addr ffff8881d29bdf38 by task syz-executor201/1726 CPU: 1 PID: 1726 Comm: syz-executor201 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 strlen+0x79/0x90 lib/string.c:525 strlen include/linux/string.h:281 [inline] hidraw_ioctl+0x245/0xae0 drivers/hid/hidraw.c:446 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445679 Code: e8 5c ad 02 00 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 9b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc8514f3a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445679 RDX: 0000000000000000 RSI: 0000000080404805 RDI: 0000000000000004 RBP: 00000000006d0018 R08: 000000000000000b R09: 00000000004002e0 R10: 000000000000000f R11: 0000000000000246 R12: 00000000004028a0 R13: 0000000000402930 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 0: (stack is not available) Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8881d29bde60 which belongs to the cache shmem_inode_cache of size 1168 The buggy address is located 216 bytes inside of 1168-byte region [ffff8881d29bde60, ffff8881d29be2f0) The buggy address belongs to the page: page:ffffea00074a6f00 refcount:1 mapcount:0 mapping:ffff8881da115180 index:0x0 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da115180 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d29bde00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d29bde80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8881d29bdf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881d29bdf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d29be000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================