From: syzbot <syzbot+4a52dbcef08fddbc887e@syzkaller.appspotmail.com>
To: alexandre.belloni@bootlin.com, 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,
lkundrak@v3.sk, logang@deltatee.com,
syzkaller-bugs@googlegroups.com
Subject: KASAN: slab-out-of-bounds Read in ld_usb_read (2)
Date: Mon, 16 Sep 2019 11:49:11 -0700 [thread overview]
Message-ID: <000000000000402f3a0592b00f13@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: f0df5c1b 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=1462f9a5600000
kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
dashboard link: https://syzkaller.appspot.com/bug?extid=4a52dbcef08fddbc887e
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4a52dbcef08fddbc887e@syzkaller.appspotmail.com
ldusb 3-1:0.98: Read buffer overflow, -2576376864 bytes dropped
==================================================================
BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x124/0x150
lib/usercopy.c:27
Read of size 536879616 at addr ffff8881ab680008 by task syz-executor.2/12817
CPU: 0 PID: 12817 Comm: syz-executor.2 Not tainted 5.3.0-rc7+ #0
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:618
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: 0033:0x4598e9
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fad75925c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9
RDX: 0000000020002200 RSI: 0000000020001200 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fad759266d4
R13: 00000000004c6d1a R14: 00000000004dc0c0 R15: 00000000ffffffff
The buggy address belongs to the page:
page:ffffea0006ada000 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:
ffff8881ab6a0300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8881ab6a0380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8881ab6a0400: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
^
ffff8881ab6a0480: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff8881ab6a0500: 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.
next reply other threads:[~2019-09-16 18:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-16 18:49 syzbot [this message]
2019-09-17 12:20 ` KASAN: slab-out-of-bounds Read in ld_usb_read (2) Andrey Konovalov
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