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Subject[PATCH 3/4] module: Support to show the current enforcement policy
Date
/sys/kernel/security/modsign/enforce gives the result of current
enforcement policy of loading module.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
---
kernel/module.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)

diff --git a/kernel/module.c b/kernel/module.c
index 79825ea..6b032577 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2794,11 +2794,60 @@ static int module_sig_check(struct load_info *info, int flags)

return err;
}
+
+#ifdef CONFIG_SECURITYFS
+static ssize_t modsign_enforce_read(struct file *filp, char __user *ubuf,
+ size_t count, loff_t *offp)
+{
+ char buf[2];
+
+ sprintf(buf, "%d", is_module_sig_enforced());
+
+ return simple_read_from_buffer(ubuf, count, offp, buf, 1);
+}
+
+static const struct file_operations modsign_enforce_ops = {
+ .read = modsign_enforce_read,
+ .llseek = generic_file_llseek,
+};
+
+static int __init securityfs_init(void)
+{
+ struct dentry *modsign_dir;
+ struct dentry *enforce;
+
+ modsign_dir = securityfs_create_dir("modsign", NULL);
+ if (IS_ERR(modsign_dir))
+ return -1;
+
+ enforce = securityfs_create_file("enforce",
+ S_IRUSR | S_IRGRP, modsign_dir,
+ NULL, &modsign_enforce_ops);
+ if (IS_ERR(enforce))
+ goto out;
+
+ return 0;
+out:
+ securityfs_remove(modsign_dir);
+
+ return -1;
+}
+#else /* !CONFIG_SECURITYFS */
+static int __init securityfs_init(void)
+{
+ return 0;
+}
+#endif
#else /* !CONFIG_MODULE_SIG */
static int module_sig_check(struct load_info *info, int flags)
{
return 0;
}
+
+static int __init securityfs_init(void)
+{
+ return 0;
+}
#endif /* !CONFIG_MODULE_SIG */

/* Sanity checks against invalid binaries, wrong arch, weird elf version. */
@@ -4395,8 +4444,14 @@ void module_layout(struct module *mod,

static int __init initialize_module(void)
{
+ int ret;
+
proc_modules_init();

+ ret = securityfs_init();
+ if (unlikely(ret))
+ return ret;
+
return 0;
}
module_init(initialize_module);
--
1.8.3.1
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