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module: Add debugfs interface to view unloaded tainted modules

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

Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Aaron Tomlin 2022-09-01 16:24:54 +01:00 committed by Luis Chamberlain
parent 7e18e42e4b
commit beef988c20
1 changed files with 68 additions and 0 deletions
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68
kernel/module/tracking.c
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@ -10,6 +10,7 @@
#include <linux/printk.h> #include <linux/printk.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/list.h> #include <linux/list.h>
#include <linux/debugfs.h>
#include <linux/rculist.h> #include <linux/rculist.h>
#include "internal.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 */