lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:	Wed, 15 Sep 2010 17:44:05 -0400
From:	Dan Rosenberg <drosenberg@...curity.com>
To:	linux-kernel@...r.kernel.org
Cc:	security@...nel.org, stable@...nel.org
Subject: [PATCH] drivers/char/amiserial.c: prevent reading uninitialized
 stack memory

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@...il.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;





--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists