From: Dan Rosenberg <drosenberg@vsecurity.com>
To: linux-kernel@vger.kernel.org
Cc: security@kernel.org, stable@kernel.org
Subject: [PATCH] drivers/char/amiserial.c: prevent reading uninitialized stack memory
Date: Wed, 15 Sep 2010 17:44:05 -0400 [thread overview]
Message-ID: <1284587045.6275.98.camel@dan> (raw)
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/amiserial.c 2010-08-26 19:47:12.000000000 -0400
+++ linux-2.6.35.4/drivers/char/amiserial.c 2010-09-15 13:58:00.217343289 -0400
@@ -1342,6 +1342,9 @@ static int rs_ioctl(struct tty_struct *t
local_irq_save(flags);
cnow = info->state->icount;
local_irq_restore(flags);
+
+ memset(&icount, 0, sizeof(struct serial_icounter_struct));
+
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
reply other threads:[~2010-09-15 21:50 UTC|newest]
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