[PATCH v2 1/2] ima: support to read appraise mode

From: Tianjia Zhang
Date: Thu Apr 09 2020 - 06:34:49 EST


Support to read appraise mode in runtime through securityfs file
'integrity/ima/appraise_mode'.

Signed-off-by: luanshi <zhangliguang@xxxxxxxxxxxxxxxxx>
Signed-off-by: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
---
security/integrity/ima/ima_fs.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index a71e822a6e92..65384f6ac0d9 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -360,6 +360,7 @@ static struct dentry *ascii_runtime_measurements;
static struct dentry *runtime_measurements_count;
static struct dentry *violations;
static struct dentry *ima_policy;
+static struct dentry *appraise_mode;

enum ima_fs_flags {
IMA_FS_BUSY,
@@ -447,6 +448,29 @@ static const struct file_operations ima_measure_policy_ops = {
.llseek = generic_file_llseek,
};

+static ssize_t ima_appraise_mode_read(struct file *filp,
+ char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ const char *mode;
+
+ if (ima_appraise & IMA_APPRAISE_ENFORCE)
+ mode = "enforce";
+ else if (ima_appraise & IMA_APPRAISE_FIX)
+ mode = "fix";
+ else if (ima_appraise & IMA_APPRAISE_LOG)
+ mode = "log";
+ else
+ mode = "off";
+
+ return simple_read_from_buffer(buf, count, ppos, mode, strlen(mode));
+}
+
+static const struct file_operations ima_appraise_mode_ops = {
+ .read = ima_appraise_mode_read,
+ .llseek = generic_file_llseek,
+};
+
int __init ima_fs_init(void)
{
ima_dir = securityfs_create_dir("ima", integrity_dir);
@@ -491,14 +515,20 @@ int __init ima_fs_init(void)
if (IS_ERR(ima_policy))
goto out;

+ appraise_mode =
+ securityfs_create_file("appraise_mode", S_IRUSR | S_IRGRP,
+ ima_dir, NULL, &ima_appraise_mode_ops);
+ if (IS_ERR(appraise_mode))
+ goto out;
+
return 0;
out:
+ securityfs_remove(ima_policy);
securityfs_remove(violations);
securityfs_remove(runtime_measurements_count);
securityfs_remove(ascii_runtime_measurements);
securityfs_remove(binary_runtime_measurements);
securityfs_remove(ima_symlink);
securityfs_remove(ima_dir);
- securityfs_remove(ima_policy);
return -1;
}
--
2.17.1