linux-kernel - [PATCH] kmod: Pass usermodehelper "-b" to use blacklist commands

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Date:	Tue, 6 May 2014 12:03:08 +0400
From:	Kirill Tkhai <ktkhai@...allels.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>, <tkhai@...dex.ru>
Subject: [PATCH] kmod: Pass usermodehelper "-b" to use blacklist commands

User may want to prohibit autoloading of some modules,
which happens when someone in kernel calls request_module().
    
For comparison, udev considers blacklist even if corresponding
hardware presents in the system. In-kernel request_module()
functionality is rather similar to udev's, so user may want
to disallow it too.
    
Signed-off-by: Kirill Tkhai <ktkhai@...allels.com>
---
 kernel/kmod.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/kmod.c b/kernel/kmod.c
index 0ac67a5..68a4ca4 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -71,7 +71,7 @@ char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
 
 static void free_modprobe_argv(struct subprocess_info *info)
 {
-	kfree(info->argv[3]); /* check call_modprobe() */
+	kfree(info->argv[4]); /* check call_modprobe() */
 	kfree(info->argv);
 }
 
@@ -85,7 +85,7 @@ static int call_modprobe(char *module_name, int wait)
 		NULL
 	};
 
-	char **argv = kmalloc(sizeof(char *[5]), GFP_KERNEL);
+	char **argv = kmalloc(sizeof(char *[6]), GFP_KERNEL);
 	if (!argv)
 		goto out;
 
@@ -95,9 +95,10 @@ static int call_modprobe(char *module_name, int wait)
 
 	argv[0] = modprobe_path;
 	argv[1] = "-q";
-	argv[2] = "--";
-	argv[3] = module_name;	/* check free_modprobe_argv() */
-	argv[4] = NULL;
+	argv[2] = "-b";
+	argv[3] = "--";
+	argv[4] = module_name;	/* check free_modprobe_argv() */
+	argv[5] = NULL;
 
 	info = call_usermodehelper_setup(modprobe_path, argv, envp, GFP_KERNEL,
 					 NULL, free_modprobe_argv, NULL);


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