Tetsuo Handa 5c6c65681f tty: vt: initialize unicode screen buffer ... commit af77c56aa3 upstream. syzbot reports kernel infoleak at vcs_read() [1], for buffer can be read immediately after resize operation. Initialize buffer using kzalloc(). ---------- #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/fb.h> int main(int argc, char *argv[]) { struct fb_var_screeninfo var = { }; const int fb_fd = open("/dev/fb0", 3); ioctl(fb_fd, FBIOGET_VSCREENINFO, &var); var.yres = 0x21; ioctl(fb_fd, FBIOPUT_VSCREENINFO, &var); return read(open("/dev/vcsu", O_RDONLY), &var, sizeof(var)) == -1; } ---------- Link: https://syzkaller.appspot.com/bug?extid=31a641689d43387f05d3 [1] Cc: stable <stable@vger.kernel.org> Reported-by: syzbot <syzbot+31a641689d43387f05d3@syzkaller.appspotmail.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Link: https://lore.kernel.org/r/4ef053cf-e796-fb5e-58b7-3ae58242a4ad@I-love.SAKURA.ne.jp Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-08-21 15:15:22 +02:00
..
hvc	tty: hvc: fix return value of __setup handler	2022-04-08 14:40:28 +02:00
ipwireless
serdev
serial	tty: drivers/tty/, stop using tty_schedule_flip()	2022-07-29 17:19:27 +02:00
vt	tty: vt: initialize unicode screen buffer	2022-08-21 15:15:22 +02:00
amiserial.c
cyclades.c	tty: drivers/tty/, stop using tty_schedule_flip()	2022-07-29 17:19:27 +02:00
ehv_bytechan.c
goldfish.c	tty: drivers/tty/, stop using tty_schedule_flip()	2022-07-29 17:19:27 +02:00
isicom.c
Kconfig
Makefile
mips_ejtag_fdc.c
moxa.c	tty: drivers/tty/, stop using tty_schedule_flip()	2022-07-29 17:19:27 +02:00
moxa.h
mxser.c	mxser: fix xmit_buf leak in activate when LSR == 0xff	2022-04-08 14:40:23 +02:00
mxser.h
n_gsm.c	tty: n_gsm: fix mux activation issues in gsm_config()	2022-05-18 10:23:46 +02:00
n_hdlc.c	tty: n_hdlc: make n_hdlc_tty_wakeup() asynchronous	2021-12-22 09:30:56 +01:00
n_null.c
n_r3964.c
n_tracerouter.c
n_tracesink.c
n_tracesink.h
n_tty.c	tty: n_tty: Restore EOF push handling behavior	2022-06-14 18:32:30 +02:00
nozomi.c
pty.c	tty: use new tty_insert_flip_string_and_push_buffer() in pty_write()	2022-07-29 17:19:28 +02:00
rocket_int.h
rocket.c
rocket.h
synclink_gt.c	tty: synclink_gt: Fix null-pointer-dereference in slgt_clean()	2022-06-14 18:32:41 +02:00
synclink.c
synclinkmp.c
sysrq.c	sysrq: do not omit current cpu when showing backtrace of all active CPUs	2022-06-14 18:32:42 +02:00
tty_audit.c
tty_baudrate.c
tty_buffer.c	tty: use new tty_insert_flip_string_and_push_buffer() in pty_write()	2022-07-29 17:19:28 +02:00
tty_io.c	tty: Fix data race between tiocsti() and flush_to_ldisc()	2021-09-15 09:50:47 +02:00
tty_ioctl.c
tty_jobctrl.c
tty_ldisc.c
tty_ldsem.c
tty_mutex.c
tty_port.c
ttynull.c
vcc.c