Alexander Potapenko 21eff69aaa vt: prevent leaking uninitialized data to userspace via /dev/vcs* ... KMSAN reported an infoleak when reading from /dev/vcs*: BUG: KMSAN: kernel-infoleak in vcs_read+0x18ba/0x1cc0 Call Trace: ... kmsan_copy_to_user+0x7a/0x160 mm/kmsan/kmsan.c:1253 copy_to_user ./include/linux/uaccess.h:184 vcs_read+0x18ba/0x1cc0 drivers/tty/vt/vc_screen.c:352 __vfs_read+0x1b2/0x9d0 fs/read_write.c:416 vfs_read+0x36c/0x6b0 fs/read_write.c:452 ... Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:189 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:315 __kmalloc+0x13a/0x350 mm/slub.c:3818 kmalloc ./include/linux/slab.h:517 vc_allocate+0x438/0x800 drivers/tty/vt/vt.c:787 con_install+0x8c/0x640 drivers/tty/vt/vt.c:2880 tty_driver_install_tty drivers/tty/tty_io.c:1224 tty_init_dev+0x1b5/0x1020 drivers/tty/tty_io.c:1324 tty_open_by_driver drivers/tty/tty_io.c:1959 tty_open+0x17b4/0x2ed0 drivers/tty/tty_io.c:2007 chrdev_open+0xc25/0xd90 fs/char_dev.c:417 do_dentry_open+0xccc/0x1440 fs/open.c:794 vfs_open+0x1b6/0x2f0 fs/open.c:908 ... Bytes 0-79 of 240 are uninitialized Consistently allocating |vc_screenbuf| with kzalloc() fixes the problem Reported-by: syzbot+17a8efdf800000@syzkaller.appspotmail.com Signed-off-by: Alexander Potapenko <glider@google.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-06-28 21:34:39 +09:00
..
hvc	treewide: kzalloc() -> kcalloc()	2018-06-12 16:19:22 -07:00
ipwireless	tty: ipwireless: Replace GFP_ATOMIC with GFP_KERNEL in ipwireless_network_create	2018-04-23 10:57:06 +02:00
serdev	serdev: fix memleak on module unload	2018-06-28 21:34:39 +09:00
serial	serial: 8250_pci: Remove stalled entries in blacklist	2018-06-28 21:34:39 +09:00
vt	vt: prevent leaking uninitialized data to userspace via /dev/vcs*	2018-06-28 21:34:39 +09:00
amiserial.c	tty: replace ->proc_fops with ->proc_show	2018-05-16 07:24:30 +02:00
cyclades.c	tty: replace ->proc_fops with ->proc_show	2018-05-16 07:24:30 +02:00
ehv_bytechan.c	treewide: kzalloc() -> kcalloc()	2018-06-12 16:19:22 -07:00
goldfish.c	treewide: kzalloc() -> kcalloc()	2018-06-12 16:19:22 -07:00
isicom.c	treewide: kmalloc() -> kmalloc_array()	2018-06-12 16:19:22 -07:00
Kconfig	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2018-04-09 09:04:10 -07:00
Makefile	tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers	2018-03-26 15:57:24 +02:00
mips_ejtag_fdc.c
moxa.c	tty: moxa: Add support for CMSPAR	2017-11-28 15:32:33 +01:00
moxa.h	tty: moxa: Add support for CMSPAR	2017-11-28 15:32:33 +01:00
mxser.c
mxser.h
n_gsm.c	Merge 4.17-rc3 into tty-next	2018-04-30 05:14:55 -07:00
n_hdlc.c	vfs: do bulk POLL* -> EPOLL* replacement	2018-02-11 14:34:03 -08:00
n_null.c
n_r3964.c	vfs: do bulk POLL* -> EPOLL* replacement	2018-02-11 14:34:03 -08:00
n_tracerouter.c
n_tracesink.c
n_tracesink.h
n_tty.c	n_tty: Access echo_* variables carefully.	2018-06-28 21:30:16 +09:00
nozomi.c	tty/nozomi: fix inconsistent indentation	2018-04-25 14:54:26 +02:00
pty.c	tty: Fix data race in tty_insert_flip_string_fixed_flag	2018-05-14 13:52:35 +02:00
rocket_int.h
rocket.c
rocket.h
synclink_gt.c	tty: replace ->proc_fops with ->proc_show	2018-05-16 07:24:30 +02:00
synclink.c	tty: replace ->proc_fops with ->proc_show	2018-05-16 07:24:30 +02:00
synclinkmp.c	tty: replace ->proc_fops with ->proc_show	2018-05-16 07:24:30 +02:00
sysrq.c	fs: add ksys_sync() helper; remove in-kernel calls to sys_sync()	2018-04-02 20:16:05 +02:00
tty_audit.c
tty_baudrate.c
tty_buffer.c
tty_io.c	vfs: change inode times to use struct timespec64	2018-06-05 16:57:31 -07:00
tty_ioctl.c	tty: add missing const to termios hw-change helper	2018-05-22 10:08:05 +02:00
tty_jobctrl.c
tty_ldisc.c	proc: introduce proc_create_seq{,_data}	2018-05-16 07:23:35 +02:00
tty_ldsem.c
tty_mutex.c
tty_port.c
vcc.c