From: syzbot <syzbot+ba00d6a2a24df57a94ca@syzkaller.appspotmail.com>
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
Subject: KASAN: slab-out-of-bounds Read in ld_usb_read
Date: Mon, 12 Aug 2019 05:18:07 -0700 [thread overview]
Message-ID: <0000000000003c013f058fea8493@google.com> (raw)
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
next reply other threads:[~2019-08-12 12:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 12:18 syzbot [this message]
2019-08-12 12:22 ` KASAN: slab-out-of-bounds Read in ld_usb_read Andrey Konovalov
2019-10-18 14:41 ` Johan Hovold
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=0000000000003c013f058fea8493@google.com \
--to=syzbot+ba00d6a2a24df57a94ca@syzkaller.appspotmail.com \
--cc=andreyknvl@google.com \
--cc=bhelgaas@google.com \
--cc=enric.balletbo@collabora.com \
--cc=gregkh@linuxfoundation.org \
--cc=kirr@nexedi.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=lkundrak@v3.sk \
--cc=logang@deltatee.com \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.