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Subject[PATCH v7 13/14] ima: Move dentry into ima_namespace and others onto stack
Date
From: Stefan Berger <stefanb@linux.ibm.com>

Move the policy file dentry into the ima_namespace for reuse by
virtualized SecurityFS and for being able to remove it from
the filesystem. Move the other dentries onto the stack.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
security/integrity/ima/ima.h | 2 ++
security/integrity/ima/ima_fs.c | 33 +++++++++++++++++++--------------
2 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index cb6c92a67ff9..d51703290e25 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -146,6 +146,8 @@ struct ima_namespace {
struct mutex ima_write_mutex;
unsigned long ima_fs_flags;
int valid_policy;
+
+ struct dentry *policy_dentry;
} __randomize_layout;

extern const int read_idmap[];
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 611c4271d474..7c5a721f4f3d 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -359,14 +359,6 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
return result;
}

-static struct dentry *ima_dir;
-static struct dentry *ima_symlink;
-static struct dentry *binary_runtime_measurements;
-static struct dentry *ascii_runtime_measurements;
-static struct dentry *runtime_measurements_count;
-static struct dentry *violations;
-static struct dentry *ima_policy;
-
enum ima_fs_flags {
IMA_FS_BUSY,
};
@@ -437,8 +429,8 @@ static int ima_release_policy(struct inode *inode, struct file *file)

ima_update_policy(ns);
#if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY)
- securityfs_remove(ima_policy);
- ima_policy = NULL;
+ securityfs_remove(ns->policy_dentry);
+ ns->policy_dentry = NULL;
#elif defined(CONFIG_IMA_WRITE_POLICY)
clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags);
#elif defined(CONFIG_IMA_READ_POLICY)
@@ -455,8 +447,16 @@ static const struct file_operations ima_measure_policy_ops = {
.llseek = generic_file_llseek,
};

-int __init ima_fs_init(void)
+static int __init ima_fs_ns_init(struct user_namespace *user_ns)
{
+ struct ima_namespace *ns = user_ns->ima_ns;
+ struct dentry *ima_dir;
+ struct dentry *ima_symlink = NULL;
+ struct dentry *binary_runtime_measurements = NULL;
+ struct dentry *ascii_runtime_measurements = NULL;
+ struct dentry *runtime_measurements_count = NULL;
+ struct dentry *violations = NULL;
+
ima_dir = securityfs_create_dir("ima", integrity_dir);
if (IS_ERR(ima_dir))
return -1;
@@ -493,20 +493,25 @@ int __init ima_fs_init(void)
if (IS_ERR(violations))
goto out;

- ima_policy = securityfs_create_file("policy", POLICY_FILE_FLAGS,
+ ns->policy_dentry = securityfs_create_file("policy", POLICY_FILE_FLAGS,
ima_dir, NULL,
&ima_measure_policy_ops);
- if (IS_ERR(ima_policy))
+ if (IS_ERR(ns->policy_dentry))
goto out;

return 0;
out:
+ securityfs_remove(ns->policy_dentry);
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;
}
+
+int __init ima_fs_init(void)
+{
+ return ima_fs_ns_init(&init_user_ns);
+}
--
2.31.1
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