linux-kernel - [PATCH v3 1/8] gpio: mockup: improve the debugfs input sanitization

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>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1497008492-14907-2-git-send-email-brgl@bgdev.pl>
Date:   Fri,  9 Jun 2017 13:41:25 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH v3 1/8] gpio: mockup: improve the debugfs input sanitization

We're currently only checking the first character of the input to the
debugfs event files, so a string like '0sdfdsf' is valid and indicates
a falling edge event.

Be more strict and only allow '0', '1', '0\n' & '1\n'.

While we're at it: move the sanitization code before the irq_enabled
check so that we indicate an error on invalid input even if nobody is
waiting for events.

Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
---
 drivers/gpio/gpio-mockup.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index ba8d62a..da76267 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -208,8 +208,7 @@ static ssize_t gpio_mockup_event_write(struct file *file,
 	struct seq_file *sfile;
 	struct gpio_desc *desc;
 	struct gpio_chip *gc;
-	int val;
-	char buf;
+	int rv, val;
 
 	sfile = file->private_data;
 	priv = sfile->private;
@@ -217,19 +216,15 @@ static ssize_t gpio_mockup_event_write(struct file *file,
 	chip = priv->chip;
 	gc = &chip->gc;
 
+	rv = kstrtoint_from_user(usr_buf, size, 0, &val);
+	if (rv)
+		return rv;
+	if (val != 0 && val != 1)
+		return -EINVAL;
+
 	if (!chip->lines[priv->offset].irq_enabled)
 		return size;
 
-	if (copy_from_user(&buf, usr_buf, 1))
-		return -EFAULT;
-
-	if (buf == '0')
-		val = 0;
-	else if (buf == '1')
-		val = 1;
-	else
-		return -EINVAL;
-
 	gpiod_set_value_cansleep(desc, val);
 	priv->chip->irq_ctx.irq = gc->irq_base + priv->offset;
 	irq_work_queue(&priv->chip->irq_ctx.work);
-- 
2.9.3