Re: [PATCH v12 03/26] ima: Define ima_namespace struct and start moving variables into it

Serge E. Hallyn
2022-05-21T02:33:53Z

On Wed, Apr 20, 2022 at 10:06:10AM -0400, Stefan Berger wrote:
> Define the ima_namespace structure and the ima_namespace variable
> init_ima_ns for the host's IMA namespace. Implement the basic functions
> ima_ns_init() and ima_init_namespace() for namespacing support.
>
> Move variables related to the IMA policy into the ima_namespace. This way
> the IMA policy of an IMA namespace can be set and displayed using a
> front-end like securityfs.
>
> In preparation for IMA namespacing, update the existing functions to
> pass the ima_namespace struct. For now, use &init_ima_ns as the current
> ima_namespace when a function that is related to a policy rule is called.
>
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> Acked-by: Christian Brauner <brauner@kernel.org>
> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
>
> ---
>
> v11:
> - Updated commit text
> - Added comments to some fields in the ima_namespace struct
>
> v9:
> - squashed patched 2 and 3 of v8
> - ima_post_read_file: only access ima_appraise in case of init_ima_ns
> ---
> security/integrity/ima/Makefile | 2 +-
> security/integrity/ima/ima.h | 53 ++++---
> security/integrity/ima/ima_api.c | 8 +-
> security/integrity/ima/ima_appraise.c | 28 ++--
> security/integrity/ima/ima_asymmetric_keys.c | 4 +-
> security/integrity/ima/ima_fs.c | 16 ++-
> security/integrity/ima/ima_init.c | 12 +-
> security/integrity/ima/ima_init_ima_ns.c | 29 ++++
> security/integrity/ima/ima_main.c | 88 +++++++-----
> security/integrity/ima/ima_policy.c | 142 ++++++++++---------
> security/integrity/ima/ima_queue_keys.c | 11 +-
> 11 files changed, 248 insertions(+), 145 deletions(-)
> create mode 100644 security/integrity/ima/ima_init_ima_ns.c
>
> diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
> index 2499f2485c04..f8a5e5f3975d 100644
> --- a/security/integrity/ima/Makefile
> +++ b/security/integrity/ima/Makefile
> @@ -7,7 +7,7 @@
> obj-$(CONFIG_IMA) += ima.o
>
> ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
> - ima_policy.o ima_template.o ima_template_lib.o
> + ima_policy.o ima_template.o ima_template_lib.o ima_init_ima_ns.o
> ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
> ima-$(CONFIG_IMA_APPRAISE_MODSIG) += ima_modsig.o
> ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o
> diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
> index be965a8715e4..9bcde1a24e74 100644
> --- a/security/integrity/ima/ima.h
> +++ b/security/integrity/ima/ima.h
> @@ -20,6 +20,7 @@
> #include <linux/hash.h>
> #include <linux/tpm.h>
> #include <linux/audit.h>
> +#include <linux/user_namespace.h>
> #include <crypto/hash_info.h>
>
> #include "../integrity.h"
> @@ -43,9 +44,6 @@ enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
>
> #define NR_BANKS(chip) ((chip != NULL) ? chip->nr_allocated_banks : 0)
>
> -/* current content of the policy */
> -extern int ima_policy_flag;
> -
> /* bitset of digests algorithms allowed in the setxattr hook */
> extern atomic_t ima_setxattr_allowed_hash_algorithms;
>
> @@ -119,6 +117,17 @@ struct ima_kexec_hdr {
> u64 count;
> };
>
> +struct ima_namespace {
> + /* policy rules */
> + struct list_head ima_default_rules; /* Kconfig, builtin & arch rules */
> + struct list_head ima_policy_rules; /* arch & custom rules */
> + struct list_head ima_temp_rules;
> +
> + struct list_head __rcu *ima_rules; /* Pointer to the current policy */
> + int ima_policy_flag;
> +} __randomize_layout;
> +extern struct ima_namespace init_ima_ns;
> +
> extern const int read_idmap[];
>
> #ifdef CONFIG_HAVE_IMA_KEXEC
> @@ -136,6 +145,7 @@ extern bool ima_canonical_fmt;
> /* Internal IMA function definitions */
> int ima_init(void);
> int ima_fs_init(void);
> +int ima_ns_init(void);
> int ima_add_template_entry(struct ima_template_entry *entry, int violation,
> const char *op, struct inode *inode,
> const unsigned char *filename);
> @@ -243,18 +253,19 @@ void ima_init_key_queue(void);
> bool ima_should_queue_key(void);
> bool ima_queue_key(struct key *keyring, const void *payload,
> size_t payload_len);
> -void ima_process_queued_keys(void);
> +void ima_process_queued_keys(struct ima_namespace *ns);
> #else
> static inline void ima_init_key_queue(void) {}
> static inline bool ima_should_queue_key(void) { return false; }
> static inline bool ima_queue_key(struct key *keyring,
> const void *payload,
> size_t payload_len) { return false; }
> -static inline void ima_process_queued_keys(void) {}
> +static inline void ima_process_queued_keys(struct ima_namespace *ns) {}
> #endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS */
>
> /* LIM API function definitions */
> -int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
> +int ima_get_action(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns, struct inode *inode,
> const struct cred *cred, u32 secid, int mask,
> enum ima_hooks func, int *pcr,
> struct ima_template_desc **template_desc,
> @@ -268,7 +279,8 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
> struct evm_ima_xattr_data *xattr_value,
> int xattr_len, const struct modsig *modsig, int pcr,
> struct ima_template_desc *template_desc);
> -int process_buffer_measurement(struct user_namespace *mnt_userns,
> +int process_buffer_measurement(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns,
> struct inode *inode, const void *buf, int size,
> const char *eventname, enum ima_hooks func,
> int pcr, const char *func_data,
> @@ -285,17 +297,18 @@ void ima_free_template_entry(struct ima_template_entry *entry);
> const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
>
> /* IMA policy related functions */
> -int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
> +int ima_match_policy(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns, struct inode *inode,
> const struct cred *cred, u32 secid, enum ima_hooks func,
> int mask, int flags, int *pcr,
> struct ima_template_desc **template_desc,
> const char *func_data, unsigned int *allowed_algos);
> -void ima_init_policy(void);
> -void ima_update_policy(void);
> -void ima_update_policy_flags(void);
> -ssize_t ima_parse_add_rule(char *);
> -void ima_delete_rules(void);
> -int ima_check_policy(void);
> +void ima_init_policy(struct ima_namespace *ns);
> +void ima_update_policy(struct ima_namespace *ns);
> +void ima_update_policy_flags(struct ima_namespace *ns);
> +ssize_t ima_parse_add_rule(struct ima_namespace *ns, char *rule);
> +void ima_delete_rules(struct ima_namespace *ns);
> +int ima_check_policy(struct ima_namespace *ns);
> void *ima_policy_start(struct seq_file *m, loff_t *pos);
> void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
> void ima_policy_stop(struct seq_file *m, void *v);
> @@ -311,14 +324,16 @@ int ima_policy_show(struct seq_file *m, void *v);
> #define IMA_APPRAISE_KEXEC 0x40
>
> #ifdef CONFIG_IMA_APPRAISE
> -int ima_check_blacklist(struct integrity_iint_cache *iint,
> +int ima_check_blacklist(struct ima_namespace *ns,
> + struct integrity_iint_cache *iint,
> const struct modsig *modsig, int pcr);
> int ima_appraise_measurement(enum ima_hooks func,
> struct integrity_iint_cache *iint,
> struct file *file, const unsigned char *filename,
> struct evm_ima_xattr_data *xattr_value,
> int xattr_len, const struct modsig *modsig);
> -int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
> +int ima_must_appraise(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns, struct inode *inode,
> int mask, enum ima_hooks func);
> void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
> enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
> @@ -329,7 +344,8 @@ int ima_read_xattr(struct dentry *dentry,
> struct evm_ima_xattr_data **xattr_value);
>
> #else
> -static inline int ima_check_blacklist(struct integrity_iint_cache *iint,
> +static inline int ima_check_blacklist(struct ima_namespace *ns,
> + struct integrity_iint_cache *iint,
> const struct modsig *modsig, int pcr)
> {
> return 0;
> @@ -346,7 +362,8 @@ static inline int ima_appraise_measurement(enum ima_hooks func,
> return INTEGRITY_UNKNOWN;
> }
>
> -static inline int ima_must_appraise(struct user_namespace *mnt_userns,
> +static inline int ima_must_appraise(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns,
> struct inode *inode, int mask,
> enum ima_hooks func)
> {
> diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
> index c6805af46211..90ef246a9f43 100644
> --- a/security/integrity/ima/ima_api.c
> +++ b/security/integrity/ima/ima_api.c
> @@ -162,6 +162,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
>
> /**
> * ima_get_action - appraise & measure decision based on policy.
> + * @ns: IMA namespace that has the policy
> * @mnt_userns: user namespace of the mount the inode was found from
> * @inode: pointer to the inode associated with the object being validated
> * @cred: pointer to credentials structure to validate
> @@ -185,7 +186,8 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
> * Returns IMA_MEASURE, IMA_APPRAISE mask.
> *
> */
> -int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
> +int ima_get_action(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns, struct inode *inode,
> const struct cred *cred, u32 secid, int mask,
> enum ima_hooks func, int *pcr,
> struct ima_template_desc **template_desc,
> @@ -193,9 +195,9 @@ int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
> {
> int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE | IMA_HASH;
>
> - flags &= ima_policy_flag;
> + flags &= ns->ima_policy_flag;
>
> - return ima_match_policy(mnt_userns, inode, cred, secid, func, mask,
> + return ima_match_policy(ns, mnt_userns, inode, cred, secid, func, mask,
> flags, pcr, template_desc, func_data,
> allowed_algos);
> }
> diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
> index 17232bbfb9f9..f1b99b895c68 100644
> --- a/security/integrity/ima/ima_appraise.c
> +++ b/security/integrity/ima/ima_appraise.c
> @@ -68,7 +68,8 @@ bool is_ima_appraise_enabled(void)
> *
> * Return 1 to appraise or hash
> */
> -int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
> +int ima_must_appraise(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns, struct inode *inode,
> int mask, enum ima_hooks func)
> {
> u32 secid;
> @@ -77,7 +78,7 @@ int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
> return 0;
>
> security_current_getsecid_subj(&secid);
> - return ima_match_policy(mnt_userns, inode, current_cred(), secid,
> + return ima_match_policy(ns, mnt_userns, inode, current_cred(), secid,
> func, mask, IMA_APPRAISE | IMA_HASH, NULL,
> NULL, NULL, NULL);
> }
> @@ -341,7 +342,8 @@ static int modsig_verify(enum ima_hooks func, const struct modsig *modsig,
> *
> * Returns -EPERM if the hash is blacklisted.
> */
> -int ima_check_blacklist(struct integrity_iint_cache *iint,
> +int ima_check_blacklist(struct ima_namespace *ns,
> + struct integrity_iint_cache *iint,
> const struct modsig *modsig, int pcr)
> {
> enum hash_algo hash_algo;
> @@ -357,7 +359,8 @@ int ima_check_blacklist(struct integrity_iint_cache *iint,
>
> rc = is_binary_blacklisted(digest, digestsize);
> if ((rc == -EPERM) && (iint->flags & IMA_MEASURE))
> - process_buffer_measurement(&init_user_ns, NULL, digest, digestsize,
> + process_buffer_measurement(ns, &init_user_ns, NULL,
> + digest, digestsize,
> "blacklisted-hash", NONE,
> pcr, NULL, false, NULL, 0);
> }
> @@ -527,14 +530,16 @@ void ima_inode_post_setattr(struct user_namespace *mnt_userns,
> struct dentry *dentry)
> {
> struct inode *inode = d_backing_inode(dentry);
> + struct ima_namespace *ns = &init_ima_ns;
> struct integrity_iint_cache *iint;
> int action;
>
> - if (!(ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode)
> + if (!(ns->ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode)
> || !(inode->i_opflags & IOP_XATTR))
> return;
>
> - action = ima_must_appraise(mnt_userns, inode, MAY_ACCESS, POST_SETATTR);
> + action = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS,
> + POST_SETATTR);
> iint = integrity_iint_find(inode);
> if (iint) {
> set_bit(IMA_CHANGE_ATTR, &iint->atomic_flags);
> @@ -559,11 +564,12 @@ static int ima_protect_xattr(struct dentry *dentry, const char *xattr_name,
> return 0;
> }
>
> -static void ima_reset_appraise_flags(struct inode *inode, int digsig)
> +static void ima_reset_appraise_flags(struct ima_namespace *ns,
> + struct inode *inode, int digsig)
> {
> struct integrity_iint_cache *iint;
>
> - if (!(ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode))
> + if (!(ns->ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode))
> return;
>
> iint = integrity_iint_find(inode);
> @@ -641,6 +647,7 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
> const void *xattr_value, size_t xattr_value_len)
> {
> const struct evm_ima_xattr_data *xvalue = xattr_value;
> + struct ima_namespace *ns = &init_ima_ns;
> int digsig = 0;
> int result;
>
> @@ -658,18 +665,19 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
> if (result)
> return result;
>
> - ima_reset_appraise_flags(d_backing_inode(dentry), digsig);
> + ima_reset_appraise_flags(ns, d_backing_inode(dentry), digsig);
> }
> return result;
> }
>
> int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> int result;
>
> result = ima_protect_xattr(dentry, xattr_name, NULL, 0);
> if (result == 1 || evm_revalidate_status(xattr_name)) {
> - ima_reset_appraise_flags(d_backing_inode(dentry), 0);
> + ima_reset_appraise_flags(ns, d_backing_inode(dentry), 0);
> if (result == 1)
> result = 0;
> }
> diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c
> index f6aa0b47a772..70d87df26068 100644
> --- a/security/integrity/ima/ima_asymmetric_keys.c
> +++ b/security/integrity/ima/ima_asymmetric_keys.c
> @@ -30,6 +30,7 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
> const void *payload, size_t payload_len,
> unsigned long flags, bool create)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> bool queued = false;
>
> /* Only asymmetric keys are handled by this hook. */
> @@ -60,7 +61,8 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
> * if the IMA policy is configured to measure a key linked
> * to the given keyring.
> */
> - process_buffer_measurement(&init_user_ns, NULL, payload, payload_len,
> + process_buffer_measurement(ns, &init_user_ns, NULL,
> + payload, payload_len,
> keyring->description, KEY_CHECK, 0,
> keyring->description, false, NULL, 0);
> }
> diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
> index cd1683dad3bf..f7ad93a56982 100644
> --- a/security/integrity/ima/ima_fs.c
> +++ b/security/integrity/ima/ima_fs.c
> @@ -271,7 +271,7 @@ static const struct file_operations ima_ascii_measurements_ops = {
> .release = seq_release,
> };
>
> -static ssize_t ima_read_policy(char *path)
> +static ssize_t ima_read_policy(struct ima_namespace *ns, char *path)
> {
> void *data = NULL;
> char *datap;
> @@ -296,7 +296,7 @@ static ssize_t ima_read_policy(char *path)
> datap = data;
> while (size > 0 && (p = strsep(&datap, "\n"))) {
> pr_debug("rule: %s\n", p);
> - rc = ima_parse_add_rule(p);
> + rc = ima_parse_add_rule(ns, p);
> if (rc < 0)
> break;
> size -= rc;
> @@ -314,6 +314,7 @@ static ssize_t ima_read_policy(char *path)
> static ssize_t ima_write_policy(struct file *file, const char __user *buf,
> size_t datalen, loff_t *ppos)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> char *data;
> ssize_t result;
>
> @@ -336,7 +337,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
> goto out_free;
>
> if (data[0] == '/') {
> - result = ima_read_policy(data);
> + result = ima_read_policy(ns, data);
> } else if (ima_appraise & IMA_APPRAISE_POLICY) {
> pr_err("signed policy file (specified as an absolute pathname) required\n");
> integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
> @@ -344,7 +345,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
> 1, 0);
> result = -EACCES;
> } else {
> - result = ima_parse_add_rule(data);
> + result = ima_parse_add_rule(ns, data);
> }
> mutex_unlock(&ima_write_mutex);
> out_free:
> @@ -410,11 +411,12 @@ 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 = &init_ima_ns;
>
> if ((file->f_flags & O_ACCMODE) == O_RDONLY)
> return seq_release(inode, file);
>
> - if (valid_policy && ima_check_policy() < 0) {
> + if (valid_policy && ima_check_policy(ns) < 0) {
> cause = "failed";
> valid_policy = 0;
> }
> @@ -424,13 +426,13 @@ static int ima_release_policy(struct inode *inode, struct file *file)
> "policy_update", cause, !valid_policy, 0);
>
> if (!valid_policy) {
> - ima_delete_rules();
> + ima_delete_rules(ns);
> valid_policy = 1;
> clear_bit(IMA_FS_BUSY, &ima_fs_flags);
> return 0;
> }
>
> - ima_update_policy();
> + ima_update_policy(ns);
> #if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY)
> securityfs_remove(ima_policy);
> ima_policy = NULL;
> diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
> index 63979aefc95f..7e5b4187035d 100644
> --- a/security/integrity/ima/ima_init.c
> +++ b/security/integrity/ima/ima_init.c
> @@ -101,15 +101,15 @@ static int __init ima_add_boot_aggregate(void)
> #ifdef CONFIG_IMA_LOAD_X509
> void __init ima_load_x509(void)
> {
> - int unset_flags = ima_policy_flag & IMA_APPRAISE;
> + int unset_flags = init_ima_ns.ima_policy_flag & IMA_APPRAISE;
>
> - ima_policy_flag &= ~unset_flags;
> + init_ima_ns.ima_policy_flag &= ~unset_flags;
> integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH);
>
> /* load also EVM key to avoid appraisal */
> evm_load_x509();
>
> - ima_policy_flag |= unset_flags;
> + init_ima_ns.ima_policy_flag |= unset_flags;
> }
> #endif
>
> @@ -117,6 +117,10 @@ int __init ima_init(void)
> {
> int rc;
>
> + rc = ima_ns_init();
> + if (rc)
> + return rc;
> +
> ima_tpm_chip = tpm_default_chip();
> if (!ima_tpm_chip)
> pr_info("No TPM chip found, activating TPM-bypass!\n");
> @@ -142,7 +146,7 @@ int __init ima_init(void)
> if (rc != 0)
> return rc;
>
> - ima_init_policy();
> + ima_init_policy(&init_ima_ns);
>
> rc = ima_fs_init();
> if (rc != 0)
> diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
> new file mode 100644
> index 000000000000..c919a456b525
> --- /dev/null
> +++ b/security/integrity/ima/ima_init_ima_ns.c
> @@ -0,0 +1,29 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2016-2022 IBM Corporation
> + * Author:
> + * Yuqiong Sun <suny@us.ibm.com>
> + * Stefan Berger <stefanb@linux.vnet.ibm.com>
> + */
> +
> +#include "ima.h"
> +
> +static int ima_init_namespace(struct ima_namespace *ns)
> +{
> + INIT_LIST_HEAD(&ns->ima_default_rules);
> + INIT_LIST_HEAD(&ns->ima_policy_rules);
> + INIT_LIST_HEAD(&ns->ima_temp_rules);
> + ns->ima_rules = (struct list_head __rcu *)(&ns->ima_default_rules);
> + ns->ima_policy_flag = 0;
> +
> + return 0;
> +}
> +
> +int __init ima_ns_init(void)
> +{
> + return ima_init_namespace(&init_ima_ns);
> +}
> +
> +struct ima_namespace init_ima_ns = {
> +};
> +EXPORT_SYMBOL(init_ima_ns);
> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index 3d3f8c5c502b..400865c521dd 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c
> @@ -185,10 +185,11 @@ static void ima_check_last_writer(struct integrity_iint_cache *iint,
> */
> void ima_file_free(struct file *file)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> struct inode *inode = file_inode(file);
> struct integrity_iint_cache *iint;
>
> - if (!ima_policy_flag || !S_ISREG(inode->i_mode))
> + if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
> return;
>
> iint = integrity_iint_find(inode);
> @@ -198,7 +199,8 @@ void ima_file_free(struct file *file)
> ima_check_last_writer(iint, inode, file);
> }
>
> -static int process_measurement(struct file *file, const struct cred *cred,
> +static int process_measurement(struct ima_namespace *ns,
> + struct file *file, const struct cred *cred,
> u32 secid, char *buf, loff_t size, int mask,
> enum ima_hooks func)
> {
> @@ -217,18 +219,18 @@ static int process_measurement(struct file *file, const struct cred *cred,
> enum hash_algo hash_algo;
> unsigned int allowed_algos = 0;
>
> - if (!ima_policy_flag || !S_ISREG(inode->i_mode))
> + if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
> return 0;
>
> /* Return an IMA_MEASURE, IMA_APPRAISE, IMA_AUDIT action
> * bitmask based on the appraise/audit/measurement policy.
> * Included is the appraise submask.
> */
> - action = ima_get_action(file_mnt_user_ns(file), inode, cred, secid,
> + action = ima_get_action(ns, file_mnt_user_ns(file), inode, cred, secid,
> mask, func, &pcr, &template_desc, NULL,
> &allowed_algos);
> violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) &&
> - (ima_policy_flag & IMA_MEASURE));
> + (ns->ima_policy_flag & IMA_MEASURE));
> if (!action && !violation_check)
> return 0;
>
> @@ -346,7 +348,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
> xattr_value, xattr_len, modsig, pcr,
> template_desc);
> if (rc == 0 && (action & IMA_APPRAISE_SUBMASK)) {
> - rc = ima_check_blacklist(iint, modsig, pcr);
> + rc = ima_check_blacklist(ns, iint, modsig, pcr);
> if (rc != -EPERM) {
> inode_lock(inode);
> rc = ima_appraise_measurement(func, iint, file,
> @@ -405,12 +407,13 @@ static int process_measurement(struct file *file, const struct cred *cred,
> */
> int ima_file_mmap(struct file *file, unsigned long prot)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> u32 secid;
>
> if (file && (prot & PROT_EXEC)) {
> security_current_getsecid_subj(&secid);
> - return process_measurement(file, current_cred(), secid, NULL,
> - 0, MAY_EXEC, MMAP_CHECK);
> + return process_measurement(ns, file, current_cred(), secid,
> + NULL, 0, MAY_EXEC, MMAP_CHECK);
> }
>
> return 0;
> @@ -431,6 +434,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
> */
> int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> struct ima_template_desc *template = NULL;
> struct file *file = vma->vm_file;
> char filename[NAME_MAX];
> @@ -443,13 +447,13 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
> int pcr;
>
> /* Is mprotect making an mmap'ed file executable? */
> - if (!(ima_policy_flag & IMA_APPRAISE) || !vma->vm_file ||
> + if (!(ns->ima_policy_flag & IMA_APPRAISE) || !vma->vm_file ||
> !(prot & PROT_EXEC) || (vma->vm_flags & VM_EXEC))
> return 0;
>
> security_current_getsecid_subj(&secid);
> inode = file_inode(vma->vm_file);
> - action = ima_get_action(file_mnt_user_ns(vma->vm_file), inode,
> + action = ima_get_action(ns, file_mnt_user_ns(vma->vm_file), inode,
> current_cred(), secid, MAY_EXEC, MMAP_CHECK,
> &pcr, &template, NULL, NULL);
>
> @@ -485,17 +489,18 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
> */
> int ima_bprm_check(struct linux_binprm *bprm)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> int ret;
> u32 secid;
>
> security_current_getsecid_subj(&secid);
> - ret = process_measurement(bprm->file, current_cred(), secid, NULL, 0,
> - MAY_EXEC, BPRM_CHECK);
> + ret = process_measurement(ns, bprm->file, current_cred(), secid, NULL,
> + 0, MAY_EXEC, BPRM_CHECK);
> if (ret)
> return ret;
>
> security_cred_getsecid(bprm->cred, &secid);
> - return process_measurement(bprm->file, bprm->cred, secid, NULL, 0,
> + return process_measurement(ns, bprm->file, bprm->cred, secid, NULL, 0,
> MAY_EXEC, CREDS_CHECK);
> }
>
> @@ -511,22 +516,23 @@ int ima_bprm_check(struct linux_binprm *bprm)
> */
> int ima_file_check(struct file *file, int mask)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> u32 secid;
>
> security_current_getsecid_subj(&secid);
> - return process_measurement(file, current_cred(), secid, NULL, 0,
> + return process_measurement(ns, file, current_cred(), secid, NULL, 0,
> mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
> MAY_APPEND), FILE_CHECK);
> }
> EXPORT_SYMBOL_GPL(ima_file_check);
>
> -static int __ima_inode_hash(struct inode *inode, struct file *file, char *buf,
> - size_t buf_size)
> +static int __ima_inode_hash(struct ima_namespace *ns, struct inode *inode,
> + struct file *file, char *buf, size_t buf_size)
> {
> struct integrity_iint_cache *iint = NULL, tmp_iint;
> int rc, hash_algo;
>
> - if (ima_policy_flag) {
> + if (ns->ima_policy_flag) {
> iint = integrity_iint_find(inode);
> if (iint)
> mutex_lock(&iint->mutex);
> @@ -595,10 +601,12 @@ static int __ima_inode_hash(struct inode *inode, struct file *file, char *buf,
> */
> int ima_file_hash(struct file *file, char *buf, size_t buf_size)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> +
> if (!file)
> return -EINVAL;
>
> - return __ima_inode_hash(file_inode(file), file, buf, buf_size);
> + return __ima_inode_hash(ns, file_inode(file), file, buf, buf_size);
> }
> EXPORT_SYMBOL_GPL(ima_file_hash);
>
> @@ -622,10 +630,12 @@ EXPORT_SYMBOL_GPL(ima_file_hash);
> */
> int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> +
> if (!inode)
> return -EINVAL;
>
> - return __ima_inode_hash(inode, NULL, buf, buf_size);
> + return __ima_inode_hash(ns, inode, NULL, buf, buf_size);
> }
> EXPORT_SYMBOL_GPL(ima_inode_hash);
>
> @@ -641,13 +651,14 @@ EXPORT_SYMBOL_GPL(ima_inode_hash);
> void ima_post_create_tmpfile(struct user_namespace *mnt_userns,
> struct inode *inode)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> struct integrity_iint_cache *iint;
> int must_appraise;
>
> - if (!ima_policy_flag || !S_ISREG(inode->i_mode))
> + if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
> return;
>
> - must_appraise = ima_must_appraise(mnt_userns, inode, MAY_ACCESS,
> + must_appraise = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS,
> FILE_CHECK);
> if (!must_appraise)
> return;
> @@ -673,14 +684,15 @@ void ima_post_create_tmpfile(struct user_namespace *mnt_userns,
> void ima_post_path_mknod(struct user_namespace *mnt_userns,
> struct dentry *dentry)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> struct integrity_iint_cache *iint;
> struct inode *inode = dentry->d_inode;
> int must_appraise;
>
> - if (!ima_policy_flag || !S_ISREG(inode->i_mode))
> + if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
> return;
>
> - must_appraise = ima_must_appraise(mnt_userns, inode, MAY_ACCESS,
> + must_appraise = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS,
> FILE_CHECK);
> if (!must_appraise)
> return;
> @@ -709,6 +721,7 @@ void ima_post_path_mknod(struct user_namespace *mnt_userns,
> int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
> bool contents)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> enum ima_hooks func;
> u32 secid;
>
> @@ -731,7 +744,7 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
> /* Read entire file for all partial reads. */
> func = read_idmap[read_id] ?: FILE_CHECK;
> security_current_getsecid_subj(&secid);
> - return process_measurement(file, current_cred(), secid, NULL,
> + return process_measurement(ns, file, current_cred(), secid, NULL,
> 0, MAY_READ, func);
> }
>
> @@ -759,6 +772,7 @@ const int read_idmap[READING_MAX_ID] = {
> int ima_post_read_file(struct file *file, void *buf, loff_t size,
> enum kernel_read_file_id read_id)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> enum ima_hooks func;
> u32 secid;
>
> @@ -767,14 +781,15 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
> return 0;
>
> if (!file || !buf || size == 0) { /* should never happen */
> - if (ima_appraise & IMA_APPRAISE_ENFORCE)
> + if (ns == &init_ima_ns &&
> + (ima_appraise & IMA_APPRAISE_ENFORCE))
> return -EACCES;
> return 0;
> }
>
> func = read_idmap[read_id] ?: FILE_CHECK;
> security_current_getsecid_subj(&secid);
> - return process_measurement(file, current_cred(), secid, buf, size,
> + return process_measurement(ns, file, current_cred(), secid, buf, size,
> MAY_READ, func);
> }
>
> @@ -862,6 +877,7 @@ int ima_post_load_data(char *buf, loff_t size,
>
> /**
> * process_buffer_measurement - Measure the buffer or the buffer data hash
> + * @ns: IMA namespace that has the policy
> * @mnt_userns: user namespace of the mount the inode was found from
> * @inode: inode associated with the object being measured (NULL for KEY_CHECK)
> * @buf: pointer to the buffer that needs to be added to the log.
> @@ -880,7 +896,8 @@ int ima_post_load_data(char *buf, loff_t size,
> * has been written to the passed location but not added to a measurement entry,
> * a negative value otherwise.
> */
> -int process_buffer_measurement(struct user_namespace *mnt_userns,
> +int process_buffer_measurement(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns,
> struct inode *inode, const void *buf, int size,
> const char *eventname, enum ima_hooks func,
> int pcr, const char *func_data,
> @@ -905,7 +922,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
> if (digest && digest_len < digest_hash_len)
> return -EINVAL;
>
> - if (!ima_policy_flag && !digest)
> + if (!ns->ima_policy_flag && !digest)
> return -ENOENT;
>
> template = ima_template_desc_buf();
> @@ -924,7 +941,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
> */
> if (func) {
> security_current_getsecid_subj(&secid);
> - action = ima_get_action(mnt_userns, inode, current_cred(),
> + action = ima_get_action(ns, mnt_userns, inode, current_cred(),
> secid, 0, func, &pcr, &template,
> func_data, NULL);
> if (!(action & IMA_MEASURE) && !digest)
> @@ -961,7 +978,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
> if (digest)
> memcpy(digest, iint.ima_hash->digest, digest_hash_len);
>
> - if (!ima_policy_flag || (func && !(action & IMA_MEASURE)))
> + if (!ns->ima_policy_flag || (func && !(action & IMA_MEASURE)))
> return 1;
>
> ret = ima_alloc_init_template(&event_data, &entry, template);
> @@ -995,6 +1012,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
> */
> void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> struct fd f;
>
> if (!buf || !size)
> @@ -1004,7 +1022,8 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
> if (!f.file)
> return;
>
> - process_buffer_measurement(file_mnt_user_ns(f.file), file_inode(f.file),
> + process_buffer_measurement(ns,
> + file_mnt_user_ns(f.file), file_inode(f.file),
> buf, size, "kexec-cmdline", KEXEC_CMDLINE, 0,
> NULL, false, NULL, 0);
> fdput(f);
> @@ -1034,10 +1053,12 @@ int ima_measure_critical_data(const char *event_label,
> const void *buf, size_t buf_len,
> bool hash, u8 *digest, size_t digest_len)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> +
> if (!event_name || !event_label || !buf || !buf_len)
> return -ENOPARAM;
>
> - return process_buffer_measurement(&init_user_ns, NULL, buf, buf_len,
> + return process_buffer_measurement(ns, &init_user_ns, NULL, buf, buf_len,
> event_name, CRITICAL_DATA, 0,
> event_label, hash, digest,
> digest_len);
> @@ -1046,6 +1067,7 @@ EXPORT_SYMBOL_GPL(ima_measure_critical_data);
>
> static int __init init_ima(void)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> int error;
>
> ima_appraise_parse_cmdline();
> @@ -1070,7 +1092,7 @@ static int __init init_ima(void)
> pr_warn("Couldn't register LSM notifier, error %d\n", error);
>
> if (!error)
> - ima_update_policy_flags();
> + ima_update_policy_flags(ns);
>
> return error;
> }
> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> index eea6e92500b8..69b19f4d5fee 100644
> --- a/security/integrity/ima/ima_policy.c
> +++ b/security/integrity/ima/ima_policy.c
> @@ -51,7 +51,6 @@
> #define INVALID_PCR(a) (((a) < 0) || \
> (a) >= (sizeof_field(struct integrity_iint_cache, measured_pcrs) * 8))
>
> -int ima_policy_flag;
> static int temp_ima_appraise;
> static int build_ima_appraise __ro_after_init;
>
> @@ -232,11 +231,6 @@ static struct ima_rule_entry critical_data_rules[] __ro_after_init = {
> /* An array of architecture specific rules */
> static struct ima_rule_entry *arch_policy_entry __ro_after_init;
>
> -static LIST_HEAD(ima_default_rules);
> -static LIST_HEAD(ima_policy_rules);
> -static LIST_HEAD(ima_temp_rules);
> -static struct list_head __rcu *ima_rules = (struct list_head __rcu *)(&ima_default_rules);
> -
> static int ima_policy __initdata;
>
> static int __init default_measure_policy_setup(char *str)
> @@ -453,12 +447,12 @@ static bool ima_rule_contains_lsm_cond(struct ima_rule_entry *entry)
> * to the old, stale LSM policy. Update the IMA LSM based rules to reflect
> * the reloaded LSM policy.
> */
> -static void ima_lsm_update_rules(void)
> +static void ima_lsm_update_rules(struct ima_namespace *ns)
> {
> struct ima_rule_entry *entry, *e;
> int result;
>
> - list_for_each_entry_safe(entry, e, &ima_policy_rules, list) {
> + list_for_each_entry_safe(entry, e, &ns->ima_policy_rules, list) {
> if (!ima_rule_contains_lsm_cond(entry))
> continue;
>
> @@ -473,10 +467,12 @@ static void ima_lsm_update_rules(void)
> int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event,
> void *lsm_data)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> +
> if (event != LSM_POLICY_CHANGE)
> return NOTIFY_DONE;
>
> - ima_lsm_update_rules();
> + ima_lsm_update_rules(ns);
> return NOTIFY_OK;
> }
>
> @@ -668,6 +664,7 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
>
> /**
> * ima_match_policy - decision based on LSM and other conditions
> + * @ns: IMA namespace that has the policy
> * @mnt_userns: user namespace of the mount the inode was found from
> * @inode: pointer to an inode for which the policy decision is being made
> * @cred: pointer to a credentials structure for which the policy decision is
> @@ -687,7 +684,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
> * list when walking it. Reads are many orders of magnitude more numerous
> * than writes so ima_match_policy() is classical RCU candidate.
> */
> -int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
> +int ima_match_policy(struct ima_namespace *ns,
> + struct user_namespace *mnt_userns, struct inode *inode,
> const struct cred *cred, u32 secid, enum ima_hooks func,
> int mask, int flags, int *pcr,
> struct ima_template_desc **template_desc,
> @@ -701,7 +699,7 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
> *template_desc = ima_template_desc_current();
>
> rcu_read_lock();
> - ima_rules_tmp = rcu_dereference(ima_rules);
> + ima_rules_tmp = rcu_dereference(ns->ima_rules);
> list_for_each_entry_rcu(entry, ima_rules_tmp, list) {
>
> if (!(entry->action & actmask))
> @@ -745,8 +743,8 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
> }
>
> /**
> - * ima_update_policy_flags() - Update global IMA variables
> - *
> + * ima_update_policy_flags() - Update namespaced IMA variables
> + * @ns: IMA namespace that has the policy
> * Update ima_policy_flag and ima_setxattr_allowed_hash_algorithms
> * based on the currently loaded policy.
> *
> @@ -759,14 +757,14 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
> *
> * Context: called after a policy update and at system initialization.
> */
> -void ima_update_policy_flags(void)
> +void ima_update_policy_flags(struct ima_namespace *ns)
> {
> struct ima_rule_entry *entry;
> int new_policy_flag = 0;
> struct list_head *ima_rules_tmp;
>
> rcu_read_lock();
> - ima_rules_tmp = rcu_dereference(ima_rules);
> + ima_rules_tmp = rcu_dereference(ns->ima_rules);
> list_for_each_entry_rcu(entry, ima_rules_tmp, list) {
> /*
> * SETXATTR_CHECK rules do not implement a full policy check
> @@ -796,7 +794,7 @@ void ima_update_policy_flags(void)
> if (!ima_appraise)
> new_policy_flag &= ~IMA_APPRAISE;
>
> - ima_policy_flag = new_policy_flag;
> + ns->ima_policy_flag = new_policy_flag;
> }
>
> static int ima_appraise_flag(enum ima_hooks func)
> @@ -812,7 +810,8 @@ static int ima_appraise_flag(enum ima_hooks func)
> return 0;
> }
>
> -static void add_rules(struct ima_rule_entry *entries, int count,
> +static void add_rules(struct ima_namespace *ns,
> + struct ima_rule_entry *entries, int count,
> enum policy_rule_list policy_rule)
> {
> int i = 0;
> @@ -821,7 +820,7 @@ static void add_rules(struct ima_rule_entry *entries, int count,
> struct ima_rule_entry *entry;
>
> if (policy_rule & IMA_DEFAULT_POLICY)
> - list_add_tail(&entries[i].list, &ima_default_rules);
> + list_add_tail(&entries[i].list, &ns->ima_default_rules);
>
> if (policy_rule & IMA_CUSTOM_POLICY) {
> entry = kmemdup(&entries[i], sizeof(*entry),
> @@ -829,7 +828,7 @@ static void add_rules(struct ima_rule_entry *entries, int count,
> if (!entry)
> continue;
>
> - list_add_tail(&entry->list, &ima_policy_rules);
> + list_add_tail(&entry->list, &ns->ima_policy_rules);
> }
> if (entries[i].action == APPRAISE) {
> if (entries != build_appraise_rules)
> @@ -842,9 +841,10 @@ static void add_rules(struct ima_rule_entry *entries, int count,
> }
> }
>
> -static int ima_parse_rule(char *rule, struct ima_rule_entry *entry);
> +static int ima_parse_rule(struct ima_namespace *ns,
> + char *rule, struct ima_rule_entry *entry);
>
> -static int __init ima_init_arch_policy(void)
> +static int __init ima_init_arch_policy(struct ima_namespace *ns)
> {
> const char * const *arch_rules;
> const char * const *rules;
> @@ -872,7 +872,7 @@ static int __init ima_init_arch_policy(void)
> result = strscpy(rule, *rules, sizeof(rule));
>
> INIT_LIST_HEAD(&arch_policy_entry[i].list);
> - result = ima_parse_rule(rule, &arch_policy_entry[i]);
> + result = ima_parse_rule(ns, rule, &arch_policy_entry[i]);
> if (result) {
> pr_warn("Skipping unknown architecture policy rule: %s\n",
> rule);
> @@ -887,26 +887,27 @@ static int __init ima_init_arch_policy(void)
>
> /**
> * ima_init_policy - initialize the default measure rules.
> - *
> + * @ns: IMA namespace to which the policy belongs to
> * ima_rules points to either the ima_default_rules or the new ima_policy_rules.
> */
> -void __init ima_init_policy(void)
> +void __init ima_init_policy(struct ima_namespace *ns)
> {
> int build_appraise_entries, arch_entries;
>
> /* if !ima_policy, we load NO default rules */
> if (ima_policy)
> - add_rules(dont_measure_rules, ARRAY_SIZE(dont_measure_rules),
> + add_rules(ns, dont_measure_rules,
> + ARRAY_SIZE(dont_measure_rules),
> IMA_DEFAULT_POLICY);
>
> switch (ima_policy) {
> case ORIGINAL_TCB:
> - add_rules(original_measurement_rules,
> + add_rules(ns, original_measurement_rules,
> ARRAY_SIZE(original_measurement_rules),
> IMA_DEFAULT_POLICY);
> break;
> case DEFAULT_TCB:
> - add_rules(default_measurement_rules,
> + add_rules(ns, default_measurement_rules,
> ARRAY_SIZE(default_measurement_rules),
> IMA_DEFAULT_POLICY);
> break;
> @@ -920,11 +921,11 @@ void __init ima_init_policy(void)
> * and custom policies, prior to other appraise rules.
> * (Highest priority)
> */
> - arch_entries = ima_init_arch_policy();
> + arch_entries = ima_init_arch_policy(ns);
> if (!arch_entries)
> pr_info("No architecture policies found\n");
> else
> - add_rules(arch_policy_entry, arch_entries,
> + add_rules(ns, arch_policy_entry, arch_entries,
> IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY);
>
> /*
> @@ -932,7 +933,7 @@ void __init ima_init_policy(void)
> * signatures, prior to other appraise rules.
> */
> if (ima_use_secure_boot)
> - add_rules(secure_boot_rules, ARRAY_SIZE(secure_boot_rules),
> + add_rules(ns, secure_boot_rules, ARRAY_SIZE(secure_boot_rules),
> IMA_DEFAULT_POLICY);
>
> /*
> @@ -944,39 +945,41 @@ void __init ima_init_policy(void)
> build_appraise_entries = ARRAY_SIZE(build_appraise_rules);
> if (build_appraise_entries) {
> if (ima_use_secure_boot)
> - add_rules(build_appraise_rules, build_appraise_entries,
> + add_rules(ns, build_appraise_rules,
> + build_appraise_entries,
> IMA_CUSTOM_POLICY);
> else
> - add_rules(build_appraise_rules, build_appraise_entries,
> + add_rules(ns, build_appraise_rules,
> + build_appraise_entries,
> IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY);
> }
>
> if (ima_use_appraise_tcb)
> - add_rules(default_appraise_rules,
> + add_rules(ns, default_appraise_rules,
> ARRAY_SIZE(default_appraise_rules),
> IMA_DEFAULT_POLICY);
>
> if (ima_use_critical_data)
> - add_rules(critical_data_rules,
> + add_rules(ns, critical_data_rules,
> ARRAY_SIZE(critical_data_rules),
> IMA_DEFAULT_POLICY);
>
> atomic_set(&ima_setxattr_allowed_hash_algorithms, 0);
>
> - ima_update_policy_flags();
> + ima_update_policy_flags(ns);
> }
>
> /* Make sure we have a valid policy, at least containing some rules. */
> -int ima_check_policy(void)
> +int ima_check_policy(struct ima_namespace *ns)
> {
> - if (list_empty(&ima_temp_rules))
> + if (list_empty(&ns->ima_temp_rules))
> return -EINVAL;
> return 0;
> }
>
> /**
> * ima_update_policy - update default_rules with new measure rules
> - *
> + * @ns: IMA namespace that has the policy
> * Called on file .release to update the default rules with a complete new
> * policy. What we do here is to splice ima_policy_rules and ima_temp_rules so
> * they make a queue. The policy may be updated multiple times and this is the
> @@ -985,16 +988,17 @@ int ima_check_policy(void)
> * Policy rules are never deleted so ima_policy_flag gets zeroed only once when
> * we switch from the default policy to user defined.
> */
> -void ima_update_policy(void)
> +void ima_update_policy(struct ima_namespace *ns)
> {
> - struct list_head *policy = &ima_policy_rules;
> + struct list_head *policy = &ns->ima_policy_rules;
>
> - list_splice_tail_init_rcu(&ima_temp_rules, policy, synchronize_rcu);
> + list_splice_tail_init_rcu(&ns->ima_temp_rules, policy,
> + synchronize_rcu);
>
> - if (ima_rules != (struct list_head __rcu *)policy) {
> - ima_policy_flag = 0;
> + if (ns->ima_rules != (struct list_head __rcu *)policy) {
> + ns->ima_policy_flag = 0;
>
> - rcu_assign_pointer(ima_rules, policy);
> + rcu_assign_pointer(ns->ima_rules, policy);
> /*
> * IMA architecture specific policy rules are specified
> * as strings and converted to an array of ima_entry_rules
> @@ -1003,10 +1007,10 @@ void ima_update_policy(void)
> */
> kfree(arch_policy_entry);
> }
> - ima_update_policy_flags();
> + ima_update_policy_flags(ns);
>
> /* Custom IMA policy has been loaded */
> - ima_process_queued_keys();
> + ima_process_queued_keys(ns);
> }
>
> /* Keep the enumeration in sync with the policy_tokens! */
> @@ -1076,7 +1080,8 @@ static const match_table_t policy_tokens = {
> {Opt_err, NULL}
> };
>
> -static int ima_lsm_rule_init(struct ima_rule_entry *entry,
> +static int ima_lsm_rule_init(struct ima_namespace *ns,
> + struct ima_rule_entry *entry,
> substring_t *args, int lsm_rule, int audit_type)
> {
> int result;
> @@ -1096,7 +1101,8 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry,
> pr_warn("rule for LSM \'%s\' is undefined\n",
> entry->lsm[lsm_rule].args_p);
>
> - if (ima_rules == (struct list_head __rcu *)(&ima_default_rules)) {
> + if (ns->ima_rules ==
> + (struct list_head __rcu *)&ns->ima_default_rules) {
> kfree(entry->lsm[lsm_rule].args_p);
> entry->lsm[lsm_rule].args_p = NULL;
> result = -EINVAL;
> @@ -1323,7 +1329,8 @@ static unsigned int ima_parse_appraise_algos(char *arg)
> return res;
> }
>
> -static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
> +static int ima_parse_rule(struct ima_namespace *ns,
> + char *rule, struct ima_rule_entry *entry)
> {
> struct audit_buffer *ab;
> char *from;
> @@ -1673,37 +1680,37 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
> break;
> case Opt_obj_user:
> ima_log_string(ab, "obj_user", args[0].from);
> - result = ima_lsm_rule_init(entry, args,
> + result = ima_lsm_rule_init(ns, entry, args,
> LSM_OBJ_USER,
> AUDIT_OBJ_USER);
> break;
> case Opt_obj_role:
> ima_log_string(ab, "obj_role", args[0].from);
> - result = ima_lsm_rule_init(entry, args,
> + result = ima_lsm_rule_init(ns, entry, args,
> LSM_OBJ_ROLE,
> AUDIT_OBJ_ROLE);
> break;
> case Opt_obj_type:
> ima_log_string(ab, "obj_type", args[0].from);
> - result = ima_lsm_rule_init(entry, args,
> + result = ima_lsm_rule_init(ns, entry, args,
> LSM_OBJ_TYPE,
> AUDIT_OBJ_TYPE);
> break;
> case Opt_subj_user:
> ima_log_string(ab, "subj_user", args[0].from);
> - result = ima_lsm_rule_init(entry, args,
> + result = ima_lsm_rule_init(ns, entry, args,
> LSM_SUBJ_USER,
> AUDIT_SUBJ_USER);
> break;
> case Opt_subj_role:
> ima_log_string(ab, "subj_role", args[0].from);
> - result = ima_lsm_rule_init(entry, args,
> + result = ima_lsm_rule_init(ns, entry, args,
> LSM_SUBJ_ROLE,
> AUDIT_SUBJ_ROLE);
> break;
> case Opt_subj_type:
> ima_log_string(ab, "subj_type", args[0].from);
> - result = ima_lsm_rule_init(entry, args,
> + result = ima_lsm_rule_init(ns, entry, args,
> LSM_SUBJ_TYPE,
> AUDIT_SUBJ_TYPE);
> break;
> @@ -1804,12 +1811,13 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
>
> /**
> * ima_parse_add_rule - add a rule to ima_policy_rules
> + * @ns: IMA namespace that has the policy
> * @rule - ima measurement policy rule
> *
> * Avoid locking by allowing just one writer at a time in ima_write_policy()
> * Returns the length of the rule parsed, an error code on failure
> */
> -ssize_t ima_parse_add_rule(char *rule)
> +ssize_t ima_parse_add_rule(struct ima_namespace *ns, char *rule)
> {
> static const char op[] = "update_policy";
> char *p;
> @@ -1833,7 +1841,7 @@ ssize_t ima_parse_add_rule(char *rule)
>
> INIT_LIST_HEAD(&entry->list);
>
> - result = ima_parse_rule(p, entry);
> + result = ima_parse_rule(ns, p, entry);
> if (result) {
> ima_free_rule(entry);
> integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
> @@ -1842,23 +1850,24 @@ ssize_t ima_parse_add_rule(char *rule)
> return result;
> }
>
> - list_add_tail(&entry->list, &ima_temp_rules);
> + list_add_tail(&entry->list, &ns->ima_temp_rules);
>
> return len;
> }
>
> /**
> - * ima_delete_rules() called to cleanup invalid in-flight policy.
> + * ima_delete_rules - called to cleanup invalid in-flight policy.
> + * @ns: IMA namespace that has the policy
> * We don't need locking as we operate on the temp list, which is
> * different from the active one. There is also only one user of
> * ima_delete_rules() at a time.
> */
> -void ima_delete_rules(void)
> +void ima_delete_rules(struct ima_namespace *ns)
> {
> struct ima_rule_entry *entry, *tmp;
>
> temp_ima_appraise = 0;
> - list_for_each_entry_safe(entry, tmp, &ima_temp_rules, list) {
> + list_for_each_entry_safe(entry, tmp, &ns->ima_temp_rules, list) {
> list_del(&entry->list);
> ima_free_rule(entry);
> }
> @@ -1884,12 +1893,13 @@ static const char *const mask_tokens[] = {
>
> void *ima_policy_start(struct seq_file *m, loff_t *pos)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> loff_t l = *pos;
> struct ima_rule_entry *entry;
> struct list_head *ima_rules_tmp;
>
> rcu_read_lock();
> - ima_rules_tmp = rcu_dereference(ima_rules);
> + ima_rules_tmp = rcu_dereference(ns->ima_rules);
> list_for_each_entry_rcu(entry, ima_rules_tmp, list) {
> if (!l--) {
> rcu_read_unlock();
> @@ -1902,6 +1912,7 @@ void *ima_policy_start(struct seq_file *m, loff_t *pos)
>
> void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> struct ima_rule_entry *entry = v;
>
> rcu_read_lock();
> @@ -1909,8 +1920,8 @@ void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos)
> rcu_read_unlock();
> (*pos)++;
>
> - return (&entry->list == &ima_default_rules ||
> - &entry->list == &ima_policy_rules) ? NULL : entry;
> + return (&entry->list == &ns->ima_default_rules ||
> + &entry->list == &ns->ima_policy_rules) ? NULL : entry;
> }
>
> void ima_policy_stop(struct seq_file *m, void *v)
> @@ -2173,6 +2184,7 @@ int ima_policy_show(struct seq_file *m, void *v)
> */
> bool ima_appraise_signature(enum kernel_read_file_id id)
> {
> + struct ima_namespace *ns = &init_ima_ns;
> struct ima_rule_entry *entry;
> bool found = false;
> enum ima_hooks func;
> @@ -2184,7 +2196,7 @@ bool ima_appraise_signature(enum kernel_read_file_id id)
> func = read_idmap[id] ?: FILE_CHECK;
>
> rcu_read_lock();
> - ima_rules_tmp = rcu_dereference(ima_rules);
> + ima_rules_tmp = rcu_dereference(ns->ima_rules);
> list_for_each_entry_rcu(entry, ima_rules_tmp, list) {
> if (entry->action != APPRAISE)
> continue;
> diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c
> index 93056c03bf5a..e366a21dd8be 100644
> --- a/security/integrity/ima/ima_queue_keys.c
> +++ b/security/integrity/ima/ima_queue_keys.c
> @@ -10,6 +10,7 @@
>
> #include <linux/user_namespace.h>
> #include <linux/workqueue.h>
> +#include <linux/ima.h>
> #include <keys/asymmetric-type.h>
> #include "ima.h"
>
> @@ -42,7 +43,7 @@ static bool timer_expired;
> static void ima_keys_handler(struct work_struct *work)
> {
> timer_expired = true;
> - ima_process_queued_keys();
> + ima_process_queued_keys(&init_ima_ns);
> }
>
> /*
> @@ -130,11 +131,15 @@ bool ima_queue_key(struct key *keyring, const void *payload,
> * This function sets ima_process_keys to true and processes queued keys.
> * From here on keys will be processed right away (not queued).
> */
> -void ima_process_queued_keys(void)
> +void ima_process_queued_keys(struct ima_namespace *ns)
> {
> struct ima_key_entry *entry, *tmp;
> bool process = false;
>
> + /* only applies to init_ima_ns */

Hm, yes, it seems to, but it should be unreachable with
ns != &init_ima_ns, ever, right?

So it seems better to either not have this hunk at all, (both
here and at ima_keys_handler()) or to actually have a BUG_ON.

Or am I completely misreading the situation?

> + if (ns != &init_ima_ns)
> + return;
> +
> if (ima_process_keys)
> return;
>
> @@ -159,7 +164,7 @@ void ima_process_queued_keys(void)
>
> list_for_each_entry_safe(entry, tmp, &ima_keys, list) {
> if (!timer_expired)
> - process_buffer_measurement(&init_user_ns, NULL,
> + process_buffer_measurement(ns, &init_user_ns, NULL,
> entry->payload,
> entry->payload_len,
> entry->keyring_name,
> --
> 2.34.1