@@ -261,6 +261,11 @@ struct ima_namespace {
struct ima_h_table ima_htable;
struct list_head ima_measurements;
unsigned long binary_runtime_size;
+
+ /* IMA's filesystem */
+ struct mutex ima_write_mutex;
+ unsigned long ima_fs_flags;
+ int valid_policy;
};
extern struct ima_namespace init_ima_ns;
@@ -25,8 +25,6 @@
#include "ima.h"
-static DEFINE_MUTEX(ima_write_mutex);
-
bool ima_canonical_fmt;
static int __init default_canonical_fmt_setup(char *str)
{
@@ -37,8 +35,6 @@ static int __init default_canonical_fmt_setup(char *str)
}
__setup("ima_canonical_fmt", default_canonical_fmt_setup);
-static int valid_policy = 1;
-
static ssize_t ima_show_htable_value(char __user *buf, size_t count,
loff_t *ppos, atomic_long_t *val)
{
@@ -339,7 +335,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
goto out;
}
- result = mutex_lock_interruptible(&ima_write_mutex);
+ result = mutex_lock_interruptible(&ns->ima_write_mutex);
if (result < 0)
goto out_free;
@@ -354,12 +350,12 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
} else {
result = ima_parse_add_rule(ns, data);
}
- mutex_unlock(&ima_write_mutex);
+ mutex_unlock(&ns->ima_write_mutex);
out_free:
kfree(data);
out:
if (result < 0)
- valid_policy = 0;
+ ns->valid_policy = 0;
return result;
}
@@ -376,8 +372,6 @@ enum ima_fs_flags {
IMA_FS_BUSY,
};
-static unsigned long ima_fs_flags;
-
#ifdef CONFIG_IMA_READ_POLICY
static const struct seq_operations ima_policy_seqops = {
.start = ima_policy_start,
@@ -392,6 +386,8 @@ static const struct seq_operations ima_policy_seqops = {
*/
static int ima_open_policy(struct inode *inode, struct file *filp)
{
+ struct ima_namespace *ns = get_current_ns();
+
if (!(filp->f_flags & O_WRONLY)) {
#ifndef CONFIG_IMA_READ_POLICY
return -EACCES;
@@ -403,7 +399,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
return seq_open(filp, &ima_policy_seqops);
#endif
}
- if (test_and_set_bit(IMA_FS_BUSY, &ima_fs_flags))
+ if (test_and_set_bit(IMA_FS_BUSY, &ns->ima_fs_flags))
return -EBUSY;
return 0;
}
@@ -417,25 +413,25 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
*/
static int ima_release_policy(struct inode *inode, struct file *file)
{
- const char *cause = valid_policy ? "completed" : "failed";
struct ima_namespace *ns = get_current_ns();
+ const char *cause = ns->valid_policy ? "completed" : "failed";
if ((file->f_flags & O_ACCMODE) == O_RDONLY)
return seq_release(inode, file);
- if (valid_policy && ima_check_policy(ns) < 0) {
+ if (ns->valid_policy && ima_check_policy(ns) < 0) {
cause = "failed";
- valid_policy = 0;
+ ns->valid_policy = 0;
}
pr_info("policy update %s\n", cause);
integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
- "policy_update", cause, !valid_policy, 0);
+ "policy_update", cause, !ns->valid_policy, 0);
- if (!valid_policy) {
+ if (!ns->valid_policy) {
ima_delete_rules(ns);
- valid_policy = 1;
- clear_bit(IMA_FS_BUSY, &ima_fs_flags);
+ ns->valid_policy = 1;
+ clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags);
return 0;
}
@@ -444,7 +440,7 @@ static int ima_release_policy(struct inode *inode, struct file *file)
securityfs_remove(ima_policy);
ima_policy = NULL;
#elif defined(CONFIG_IMA_WRITE_POLICY)
- clear_bit(IMA_FS_BUSY, &ima_fs_flags);
+ clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags);
#elif defined(CONFIG_IMA_READ_POLICY)
inode->i_mode &= ~S_IWUSR;
#endif
@@ -49,6 +49,10 @@ int ima_init_namespace(struct ima_namespace *ns)
else
ns->binary_runtime_size = ULONG_MAX;
+ mutex_init(&ns->ima_write_mutex);
+ ns->valid_policy = 1;
+ ns->ima_fs_flags = 0;
+
return 0;
}
Move the ima_write_mutex, ima_fs_flag, and valid_policy variables into ima_namespace. This way each IMA namespace can set those variables independently. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> --- include/linux/ima.h | 5 ++++ security/integrity/ima/ima_fs.c | 32 +++++++++++------------- security/integrity/ima/ima_init_ima_ns.c | 4 +++ 3 files changed, 23 insertions(+), 18 deletions(-)