linux-kernel - [PATCH] swsusp: Fix sysfs interface

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]

Message-Id: <200705152302.02048.rjw@sisk.pl>
Date:	Tue, 15 May 2007 23:02:01 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Peter Moulder <Peter.Moulder@...otech.monash.edu.au>,
	Johannes Berg <johannes@...solutions.net>
Subject: [PATCH] swsusp: Fix sysfs interface

From: Rafael J. Wysocki <rjw@...k.pl>

The sysfs files /sys/power/disk and /sys/power/state do not work as documented,
since they allow the user to write only a few initial characters of the
input string to trigger the option (eg. 'echo pl > /sys/power/disk' activates
the platform mode of hibernation).  Fix it.

Special thanks to Peter Moulder <Peter.Moulder@...otech.monash.edu.au> for
pointing out the problem.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Acked-by: Pavel Machek <pavel@....cz>
---
 kernel/power/disk.c |    3 ++-
 kernel/power/main.c |    4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

Index: linux-2.6.21/kernel/power/disk.c
===================================================================
--- linux-2.6.21.orig/kernel/power/disk.c	2007-05-11 12:06:28.000000000 +0200
+++ linux-2.6.21/kernel/power/disk.c	2007-05-11 12:06:33.000000000 +0200
@@ -416,7 +416,8 @@ static ssize_t disk_store(struct subsyst
 
 	mutex_lock(&pm_mutex);
 	for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
-		if (!strncmp(buf, hibernation_modes[i], len)) {
+		if (len == strlen(hibernation_modes[i])
+		    && !strncmp(buf, hibernation_modes[i], len)) {
 			mode = i;
 			break;
 		}
Index: linux-2.6.21/kernel/power/main.c
===================================================================
--- linux-2.6.21.orig/kernel/power/main.c	2007-05-11 12:06:28.000000000 +0200
+++ linux-2.6.21/kernel/power/main.c	2007-05-11 12:07:02.000000000 +0200
@@ -289,13 +289,13 @@ static ssize_t state_store(struct subsys
 	len = p ? p - buf : n;
 
 	/* First, check if we are requested to hibernate */
-	if (!strncmp(buf, "disk", len)) {
+	if (len == 4 && !strncmp(buf, "disk", len)) {
 		error = hibernate();
 		return error ? error : n;
 	}
 
 	for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
-		if (*s && !strncmp(buf, *s, len))
+		if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
 			break;
 	}
 	if (state < PM_SUSPEND_MAX && *s)
-
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/