[PATCH v6 16/17] ima: Move dentry into ima_namespace and others onto stack
From: Stefan Berger <stefanb@linux.ibm.com>
Date: 2021-12-10 19:48:19
Also in:
linux-integrity, lkml
Subsystem:
extended verification module (evm), integrity measurement architecture (ima), security subsystem, the rest · Maintainers:
Mimi Zohar, Roberto Sassu, Dmitry Kasatkin, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
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> --- include/linux/ima.h | 2 ++ security/integrity/ima/ima_fs.c | 33 +++++++++++++++++++-------------- 2 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/include/linux/ima.h b/include/linux/ima.h
index ca300306a715..cc950ccbf157 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h@@ -273,6 +273,8 @@ struct ima_namespace { struct mutex ima_write_mutex; unsigned long ima_fs_flags; int valid_policy; + + struct dentry *policy_dentry; }; extern struct ima_namespace init_ima_ns;
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 090ee85bfa3a..84b3bf2f1454 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c@@ -405,14 +405,6 @@ 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, };
@@ -485,8 +477,8 @@ 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)
@@ -503,8 +495,16 @@ 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;
@@ -541,20 +541,25 @@ 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