linux-kernel - [PATCH 1/3] staging: vme: use image mutex for ioctl()

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: <1416008178-9393-2-git-send-email-dmitry.kalinkin@gmail.com>
Date:	Sat, 15 Nov 2014 02:36:16 +0300
From:	Dmitry Kalinkin <dmitry.kalinkin@...il.com>
To:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc:	Martyn Welch <martyn.welch@...com>,
	Manohar Vanga <manohar.vanga@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Igor Alekseev <igor.alekseev@...p.ru>,
	Dmitry Kalinkin <dmitry.kalinkin@...il.com>
Subject: [PATCH 1/3] staging: vme: use image mutex for ioctl()

This implements more granular locking in vme_user_ioctl() by using separate
locks for each devfs device.

This also provides a synchronization between vme_user_read(), vme_user_write()
and vme_user_ioctl().

Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@...il.com>
Cc: Igor Alekseev <igor.alekseev@...p.ru>
---
 drivers/staging/vme/devices/vme_user.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/vme/devices/vme_user.c b/drivers/staging/vme/devices/vme_user.c
index 8b1f533..8731838 100644
--- a/drivers/staging/vme/devices/vme_user.c
+++ b/drivers/staging/vme/devices/vme_user.c
@@ -41,7 +41,6 @@
 
 #include "vme_user.h"
 
-static DEFINE_MUTEX(vme_user_mutex);
 static const char driver_name[] = "vme_user";
 
 static int bus[VME_USER_BUS_MAX];
@@ -555,10 +554,12 @@ static long
 vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	int ret;
+	struct inode *inode = file_inode(file);
+	unsigned int minor = MINOR(inode->i_rdev);
 
-	mutex_lock(&vme_user_mutex);
-	ret = vme_user_ioctl(file_inode(file), file, cmd, arg);
-	mutex_unlock(&vme_user_mutex);
+	mutex_lock(&image[minor].mutex);
+	ret = vme_user_ioctl(inode, file, cmd, arg);
+	mutex_unlock(&image[minor].mutex);
 
 	return ret;
 }
-- 
1.9.1

--
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/