Commit beef988c authored by Aaron Tomlin's avatar Aaron Tomlin Committed by Luis Chamberlain
Browse files

module: Add debugfs interface to view unloaded tainted modules 



This patch provides debug/modules/unloaded_tainted file to see a
record of unloaded tainted modules.

Signed-off-by: default avatarAaron Tomlin <atomlin@redhat.com>
Signed-off-by: default avatarLuis Chamberlain <mcgrof@kernel.org>
parent 7e18e42e

kernel/module/tracking.c

+68 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/printk.h>

#include <linux/slab.h>

#include <linux/list.h>

#include <linux/debugfs.h>

#include <linux/rculist.h>

#include "internal.h"
@@ -59,3 +60,70 @@ void print_unloaded_tainted_modules(void) 
		}

	}

}



#ifdef CONFIG_DEBUG_FS

static void *unloaded_tainted_modules_seq_start(struct seq_file *m, loff_t *pos)

	__acquires(rcu)

{

	rcu_read_lock();

	return seq_list_start_rcu(&unloaded_tainted_modules, *pos);

}



static void *unloaded_tainted_modules_seq_next(struct seq_file *m, void *p, loff_t *pos)

{

	return seq_list_next_rcu(p, &unloaded_tainted_modules, pos);

}



static void unloaded_tainted_modules_seq_stop(struct seq_file *m, void *p)

	__releases(rcu)

{

	rcu_read_unlock();

}



static int unloaded_tainted_modules_seq_show(struct seq_file *m, void *p)

{

	struct mod_unload_taint *mod_taint;

	char buf[MODULE_FLAGS_BUF_SIZE];

	size_t l;



	mod_taint = list_entry(p, struct mod_unload_taint, list);

	l = module_flags_taint(mod_taint->taints, buf);

	buf[l++] = '\0';



	seq_printf(m, "%s (%s) %llu", mod_taint->name, buf, mod_taint->count);

	seq_puts(m, "\n");



	return 0;

}



static const struct seq_operations unloaded_tainted_modules_seq_ops = {

	.start = unloaded_tainted_modules_seq_start,

	.next  = unloaded_tainted_modules_seq_next,

	.stop  = unloaded_tainted_modules_seq_stop,

	.show  = unloaded_tainted_modules_seq_show,

};



static int unloaded_tainted_modules_open(struct inode *inode, struct file *file)

{

	return seq_open(file, &unloaded_tainted_modules_seq_ops);

}



static const struct file_operations unloaded_tainted_modules_fops = {

	.open = unloaded_tainted_modules_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = seq_release,

};



static int __init unloaded_tainted_modules_init(void)

{

	struct dentry *dir;



	dir = debugfs_create_dir("modules", NULL);

	debugfs_create_file("unloaded_tainted", 0444, dir, NULL,

			    &unloaded_tainted_modules_fops);



	return 0;

}

module_init(unloaded_tainted_modules_init);

#endif /* CONFIG_DEBUG_FS */