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Wed, 21 Aug 2019 05:57:36 -0700 (PDT) Date: Wed, 21 Aug 2019 05:57:36 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000095ae90590a01e9a@google.com> Subject: Re: Re: KASAN: slab-out-of-bounds Read in hidraw_ioctl From: syzbot To: Andrey Konovalov Cc: 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 > On Sun, Aug 11, 2019 at 10:46 PM syzbot > wrote: >> 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 >> ================================================================== > Trying Alan's fix from another thread here: > #syz test: https://github.com/google/kasan.git usb-fuzzer e96407b4 want 2 args (repo, branch), got 3