linux-kernel - [PATCH 1/2] uevent: don't pass envp_ext[] as format string in kobject_uevent

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Message-ID: <48B6D28E.10006@kernel.org>
Date:	Thu, 28 Aug 2008 18:30:06 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Greg KH <greg@...ah.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] uevent: don't pass envp_ext[] as format string in kobject_uevent_env()

kobject_uevent_env() uses envp_ext[] as verbatim format string which
can cause problems ranging from unexpectedly mangled string to oops if
a string in envp_ext[] contains substring which can be interpreted as
format.  Fix it.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 lib/kobject_uevent.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 3f91472..ca215bc 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -165,7 +165,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
 	/* keys passed in from the caller */
 	if (envp_ext) {
 		for (i = 0; envp_ext[i]; i++) {
-			retval = add_uevent_var(env, envp_ext[i]);
+			retval = add_uevent_var(env, "%s", envp_ext[i]);
 			if (retval)
 				goto exit;
 		}
-- 
1.5.4.5

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