All of
 help / color / mirror / Atom feed
* KASAN: user-memory-access Read in do_con_write (2)
@ 2020-06-29  4:56 syzbot
  0 siblings, 0 replies; only message in thread
From: syzbot @ 2020-06-29  4:56 UTC (permalink / raw)
  To: ebiggers, gregkh, jslaby, linux-kernel, nico, sam, syzkaller-bugs


syzbot found the following crash on:

HEAD commit:    4e99b321 Merge tag 'nfs-for-5.8-2' of git://git.linux-nfs...
git tree:       upstream
console output:
kernel config:
dashboard link:
compiler:       gcc (GCC) 10.1.0-syz 20200507

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:

BUG: KASAN: user-memory-access in memcpy include/linux/string.h:406 [inline]
BUG: KASAN: user-memory-access in scr_memcpyw include/linux/vt_buffer.h:49 [inline]
BUG: KASAN: user-memory-access in delete_char drivers/tty/vt/vt.c:858 [inline]
BUG: KASAN: user-memory-access in csi_P drivers/tty/vt/vt.c:2013 [inline]
BUG: KASAN: user-memory-access in do_con_trol drivers/tty/vt/vt.c:2407 [inline]
BUG: KASAN: user-memory-access in do_con_write+0x6f90/0x7400 drivers/tty/vt/vt.c:2823
Read of size 118 at addr 00000000ffffff9a by task syz-executor.4/10580

CPU: 0 PID: 10580 Comm: syz-executor.4 Not tainted 5.8.0-rc2-syzkaller #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+0x18f/0x20d lib/dump_stack.c:118
 __kasan_report mm/kasan/report.c:517 [inline]
 kasan_report.cold+0x5/0x37 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:186 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
 memcpy+0x20/0x60 mm/kasan/common.c:105
 memcpy include/linux/string.h:406 [inline]
 scr_memcpyw include/linux/vt_buffer.h:49 [inline]
 delete_char drivers/tty/vt/vt.c:858 [inline]
 csi_P drivers/tty/vt/vt.c:2013 [inline]
 do_con_trol drivers/tty/vt/vt.c:2407 [inline]
 do_con_write+0x6f90/0x7400 drivers/tty/vt/vt.c:2823
 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3159
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x3ce/0xf80 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:962 [inline]
 tty_write+0x4d9/0x870 drivers/tty/tty_io.c:1046
 __vfs_write+0x76/0x100 fs/read_write.c:495
 vfs_write+0x268/0x5d0 fs/read_write.c:559
 ksys_write+0x12d/0x250 fs/read_write.c:612
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
RIP: 0033:0x45cb19
Code: Bad RIP value.
RSP: 002b:00007fcc7ee74c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000050e080 RCX: 000000000045cb19
RDX: 0000000000000320 RSI: 00000000200001c0 RDI: 0000000000000007
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000d2a R14: 00000000004cf845 R15: 00007fcc7ee756d4

This bug is generated by a bot. It may contain errors.
See for more information about syzbot.
syzbot engineers can be reached at

syzbot will keep track of this bug report. See: for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2020-06-29 21:02 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-06-29  4:56 KASAN: user-memory-access Read in do_con_write (2) syzbot

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.