lkml.org 
[lkml]   [2010]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH] drivers/char/nozomi.c: prevent reading uninitialized stack memory
From
Date
The TIOCGICOUNT device ioctl allows unprivileged users to read
uninitialized stack memory, because the "reserved" member of the
serial_icounter_struct struct declared on the stack is not altered or
zeroed before being copied back to the user. This patch takes care of
it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>

--- linux-2.6.35.4.orig/drivers/char/nozomi.c 2010-08-26 19:47:12.000000000 -0400
+++ linux-2.6.35.4/drivers/char/nozomi.c 2010-09-15 13:58:26.324877778 -0400
@@ -1810,6 +1810,8 @@ static int ntty_ioctl_tiocgicount(struct
const struct async_icount cnow = port->tty_icount;
struct serial_icounter_struct icount;

+ memset(&icount, 0, sizeof(struct serial_icounter_struct));
+
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;





\
 
 \ /
  Last update: 2010-09-15 23:53    [W:0.186 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site