diff options
Diffstat (limited to 'security/integrity')
| -rw-r--r-- | security/integrity/ima/Kconfig | 5 | ||||
| -rw-r--r-- | security/integrity/ima/ima.h | 6 | ||||
| -rw-r--r-- | security/integrity/ima/ima_api.c | 5 | ||||
| -rw-r--r-- | security/integrity/ima/ima_audit.c | 3 | ||||
| -rw-r--r-- | security/integrity/ima/ima_crypto.c | 5 | ||||
| -rw-r--r-- | security/integrity/ima/ima_fs.c | 48 | ||||
| -rw-r--r-- | security/integrity/ima/ima_iint.c | 27 | ||||
| -rw-r--r-- | security/integrity/ima/ima_init.c | 3 | ||||
| -rw-r--r-- | security/integrity/ima/ima_main.c | 248 | ||||
| -rw-r--r-- | security/integrity/ima/ima_policy.c | 117 | ||||
| -rw-r--r-- | security/integrity/ima/ima_queue.c | 5 |
11 files changed, 243 insertions, 229 deletions
diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index 3d7846de8069..b6ecfd4d8d78 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -2,15 +2,14 @@ # config IMA bool "Integrity Measurement Architecture(IMA)" - depends on ACPI depends on SECURITY select SECURITYFS select CRYPTO select CRYPTO_HMAC select CRYPTO_MD5 select CRYPTO_SHA1 - select TCG_TPM - select TCG_TIS + select TCG_TPM if !S390 + select TCG_TIS if TCG_TPM help The Trusted Computing Group(TCG) runtime Integrity Measurement Architecture(IMA) maintains a list of hash diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index c41afe6639a0..3fbcd1dda0ef 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -35,6 +35,7 @@ enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) /* set during initialization */ +extern int iint_initialized; extern int ima_initialized; extern int ima_used_chip; extern char *ima_hash; @@ -65,7 +66,6 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode, const char *cause, int result, int info); /* Internal IMA function definitions */ -void ima_iintcache_init(void); int ima_init(void); void ima_cleanup(void); int ima_fs_init(void); @@ -131,12 +131,12 @@ void iint_free(struct kref *kref); void iint_rcu_free(struct rcu_head *rcu); /* IMA policy related functions */ -enum ima_hooks { PATH_CHECK = 1, FILE_MMAP, BPRM_CHECK }; +enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK }; int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); void ima_init_policy(void); void ima_update_policy(void); -int ima_parse_add_rule(char *); +ssize_t ima_parse_add_rule(char *); void ima_delete_rules(void); /* LSM based policy rules require audit */ diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index 3cd58b60afd2..52015d098fdf 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -13,6 +13,7 @@ * and store_template. */ #include <linux/module.h> +#include <linux/slab.h> #include "ima.h" static const char *IMA_TEMPLATE_NAME = "ima"; @@ -95,12 +96,12 @@ err_out: * ima_must_measure - measure decision based on policy. * @inode: pointer to inode to measure * @mask: contains the permission mask (MAY_READ, MAY_WRITE, MAY_EXECUTE) - * @function: calling function (PATH_CHECK, BPRM_CHECK, FILE_MMAP) + * @function: calling function (FILE_CHECK, BPRM_CHECK, FILE_MMAP) * * The policy is defined in terms of keypairs: * subj=, obj=, type=, func=, mask=, fsmagic= * subj,obj, and type: are LSM specific. - * func: PATH_CHECK | BPRM_CHECK | FILE_MMAP + * func: FILE_CHECK | BPRM_CHECK | FILE_MMAP * mask: contains the permission mask * fsmagic: hex value * diff --git a/security/integrity/ima/ima_audit.c b/security/integrity/ima/ima_audit.c index ff513ff737f5..c5c5a72c30be 100644 --- a/security/integrity/ima/ima_audit.c +++ b/security/integrity/ima/ima_audit.c @@ -11,6 +11,7 @@ */ #include <linux/fs.h> +#include <linux/gfp.h> #include <linux/audit.h> #include "ima.h" @@ -40,7 +41,7 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode, return; ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno); - audit_log_format(ab, "integrity: pid=%d uid=%u auid=%u ses=%u", + audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u", current->pid, current_cred()->uid, audit_get_loginuid(current), audit_get_sessionid(current)); diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index 46642a19bc78..9b3ade7468b2 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -18,6 +18,7 @@ #include <linux/crypto.h> #include <linux/scatterlist.h> #include <linux/err.h> +#include <linux/slab.h> #include "ima.h" static int init_desc(struct hash_desc *desc) @@ -26,7 +27,7 @@ static int init_desc(struct hash_desc *desc) desc->tfm = crypto_alloc_hash(ima_hash, 0, CRYPTO_ALG_ASYNC); if (IS_ERR(desc->tfm)) { - pr_info("failed to load %s transform: %ld\n", + pr_info("IMA: failed to load %s transform: %ld\n", ima_hash, PTR_ERR(desc->tfm)); rc = PTR_ERR(desc->tfm); return rc; @@ -111,7 +112,7 @@ static void __init ima_pcrread(int idx, u8 *pcr) return; if (tpm_pcr_read(TPM_ANY_NUM, idx, pcr) != 0) - pr_err("Error Communicating to TPM chip\n"); + pr_err("IMA: Error Communicating to TPM chip\n"); } /* diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 0c72c9c38956..ef21b96a0b42 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -16,6 +16,7 @@ * current measurement list and IMA statistics */ #include <linux/fcntl.h> +#include <linux/slab.h> #include <linux/module.h> #include <linux/seq_file.h> #include <linux/rculist.h> @@ -44,7 +45,8 @@ static ssize_t ima_show_htable_violations(struct file *filp, } static const struct file_operations ima_htable_violations_ops = { - .read = ima_show_htable_violations + .read = ima_show_htable_violations, + .llseek = generic_file_llseek, }; static ssize_t ima_show_measurements_count(struct file *filp, @@ -56,7 +58,8 @@ static ssize_t ima_show_measurements_count(struct file *filp, } static const struct file_operations ima_measurements_count_ops = { - .read = ima_show_measurements_count + .read = ima_show_measurements_count, + .llseek = generic_file_llseek, }; /* returns pointer to hlist_node */ @@ -243,32 +246,34 @@ static const struct file_operations ima_ascii_measurements_ops = { static ssize_t ima_write_policy(struct file *file, const char __user *buf, size_t datalen, loff_t *ppos) { - char *data; - int rc; + char *data = NULL; + ssize_t result; if (datalen >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } + datalen = PAGE_SIZE - 1; + + /* No partial writes. */ + result = -EINVAL; + if (*ppos != 0) + goto out; + + result = -ENOMEM; data = kmalloc(datalen + 1, GFP_KERNEL); if (!data) - return -ENOMEM; + goto out; - if (copy_from_user(data, buf, datalen)) { - kfree(data); - return -EFAULT; - } *(data + datalen) = '\0'; - rc = ima_parse_add_rule(data); - if (rc < 0) { - datalen = -EINVAL; - valid_policy = 0; - } + result = -EFAULT; + if (copy_from_user(data, buf, datalen)) + goto out; + + result = ima_parse_add_rule(data); +out: + if (result < 0) + valid_policy = 0; kfree(data); - return datalen; + return result; } static struct dentry *ima_dir; @@ -316,7 +321,8 @@ static int ima_release_policy(struct inode *inode, struct file *file) static const struct file_operations ima_measure_policy_ops = { .open = ima_open_policy, .write = ima_write_policy, - .release = ima_release_policy + .release = ima_release_policy, + .llseek = generic_file_llseek, }; int __init ima_fs_init(void) diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c index fa592ff1ac1c..afba4aef812f 100644 --- a/security/integrity/ima/ima_iint.c +++ b/security/integrity/ima/ima_iint.c @@ -14,6 +14,7 @@ * - cache integrity information associated with an inode * using a radix tree. */ +#include <linux/slab.h> #include <linux/module.h> #include <linux/spinlock.h> #include <linux/radix-tree.h> @@ -21,9 +22,10 @@ RADIX_TREE(ima_iint_store, GFP_ATOMIC); DEFINE_SPINLOCK(ima_iint_lock); - static struct kmem_cache *iint_cache __read_mostly; +int iint_initialized = 0; + /* ima_iint_find_get - return the iint associated with an inode * * ima_iint_find_get gets a reference to the iint. Caller must @@ -52,9 +54,6 @@ int ima_inode_alloc(struct inode *inode) struct ima_iint_cache *iint = NULL; int rc = 0; - if (!ima_initialized) - return 0; - iint = kmem_cache_alloc(iint_cache, GFP_NOFS); if (!iint) return -ENOMEM; @@ -66,12 +65,11 @@ int ima_inode_alloc(struct inode *inode) spin_lock(&ima_iint_lock); rc = radix_tree_insert(&ima_iint_store, (unsigned long)inode, iint); spin_unlock(&ima_iint_lock); + radix_tree_preload_end(); out: if (rc < 0) kmem_cache_free(iint_cache, iint); - radix_tree_preload_end(); - return rc; } @@ -83,21 +81,21 @@ void iint_free(struct kref *kref) iint->version = 0; iint->flags = 0UL; if (iint->readcount != 0) { - printk(KERN_INFO "%s: readcount: %ld\n", __FUNCTION__, + printk(KERN_INFO "%s: readcount: %ld\n", __func__, iint->readcount); iint->readcount = 0; } if (iint->writecount != 0) { - printk(KERN_INFO "%s: writecount: %ld\n", __FUNCTION__, + printk(KERN_INFO "%s: writecount: %ld\n", __func__, iint->writecount); iint->writecount = 0; } if (iint->opencount != 0) { - printk(KERN_INFO "%s: opencount: %ld\n", __FUNCTION__, + printk(KERN_INFO "%s: opencount: %ld\n", __func__, iint->opencount); iint->opencount = 0; } - kref_set(&iint->refcount, 1); + kref_init(&iint->refcount); kmem_cache_free(iint_cache, iint); } @@ -118,8 +116,6 @@ void ima_inode_free(struct inode *inode) { struct ima_iint_cache *iint; - if (!ima_initialized) - return; spin_lock(&ima_iint_lock); iint = radix_tree_delete(&ima_iint_store, (unsigned long)inode); spin_unlock(&ima_iint_lock); @@ -138,12 +134,15 @@ static void init_once(void *foo) iint->readcount = 0; iint->writecount = 0; iint->opencount = 0; - kref_set(&iint->refcount, 1); + kref_init(&iint->refcount); } -void __init ima_iintcache_init(void) +static int __init ima_iintcache_init(void) { iint_cache = kmem_cache_create("iint_cache", sizeof(struct ima_iint_cache), 0, SLAB_PANIC, init_once); + iint_initialized = 1; + return 0; } +security_initcall(ima_iintcache_init); diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index a40da7ae5900..17f1f060306f 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -16,6 +16,7 @@ */ #include <linux/module.h> #include <linux/scatterlist.h> +#include <linux/slab.h> #include <linux/err.h> #include "ima.h" @@ -82,7 +83,7 @@ int __init ima_init(void) ima_used_chip = 1; if (!ima_used_chip) - pr_info("No TPM chip found, activating TPM-bypass!\n"); + pr_info("IMA: No TPM chip found, activating TPM-bypass!\n"); ima_add_boot_aggregate(); /* boot aggregate must be first entry */ ima_init_policy(); diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index a89f44d5e030..e662b89d4079 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -14,13 +14,14 @@ * * File: ima_main.c * implements the IMA hooks: ima_bprm_check, ima_file_mmap, - * and ima_path_check. + * and ima_file_check. */ #include <linux/module.h> #include <linux/file.h> #include <linux/binfmts.h> #include <linux/mount.h> #include <linux/mman.h> +#include <linux/slab.h> #include "ima.h" @@ -84,6 +85,36 @@ out: return found; } +/* ima_read_write_check - reflect possible reading/writing errors in the PCR. + * + * When opening a file for read, if the file is already open for write, + * the file could change, resulting in a file measurement error. + * + * Opening a file for write, if the file is already open for read, results + * in a time of measure, time of use (ToMToU) error. + * + * In either case invalidate the PCR. + */ +enum iint_pcr_error { TOMTOU, OPEN_WRITERS }; +static void ima_read_write_check(enum iint_pcr_error error, + struct ima_iint_cache *iint, + struct inode *inode, + const unsigned char *filename) +{ + switch (error) { + case TOMTOU: + if (iint->readcount > 0) + ima_add_violation(inode, filename, "invalid_pcr", + "ToMToU"); + break; + case OPEN_WRITERS: + if (iint->writecount > 0) + ima_add_violation(inode, filename, "invalid_pcr", + "open_writers"); + break; + } +} + /* * Update the counts given an fmode_t */ @@ -99,6 +130,49 @@ static void ima_inc_counts(struct ima_iint_cache *iint, fmode_t mode) } /* + * ima_counts_get - increment file counts + * + * Maintain read/write counters for all files, but only + * invalidate the PCR for measured files: + * - Opening a file for write when already open for read, + * results in a time of measure, time of use (ToMToU) error. + * - Opening a file for read when already open for write, + * could result in a file measurement error. + * + */ +void ima_counts_get(struct file *file) +{ + struct dentry *dentry = file->f_path.dentry; + struct inode *inode = dentry->d_inode; + fmode_t mode = file->f_mode; + struct ima_iint_cache *iint; + int rc; + + if (!iint_initialized || !S_ISREG(inode->i_mode)) + return; + iint = ima_iint_find_get(inode); + if (!iint) + return; + mutex_lock(&iint->mutex); + if (!ima_initialized) + goto out; + rc = ima_must_measure(iint, inode, MAY_READ, FILE_CHECK); + if (rc < 0) + goto out; + + if (mode & FMODE_WRITE) { + ima_read_write_check(TOMTOU, iint, inode, dentry->d_name.name); + goto out; + } + ima_read_write_check(OPEN_WRITERS, iint, inode, dentry->d_name.name); +out: + ima_inc_counts(iint, file->f_mode); + mutex_unlock(&iint->mutex); + + kref_put(&iint->refcount, iint_free); +} + +/* * Decrement ima counts */ static void ima_dec_counts(struct ima_iint_cache *iint, struct inode *inode, @@ -123,7 +197,7 @@ static void ima_dec_counts(struct ima_iint_cache *iint, struct inode *inode, (iint->writecount < 0)) && !ima_limit_imbalance(file)) { printk(KERN_INFO "%s: open/free imbalance (r:%ld w:%ld o:%ld)\n", - __FUNCTION__, iint->readcount, iint->writecount, + __func__, iint->readcount, iint->writecount, iint->opencount); dump_stack(); } @@ -141,7 +215,7 @@ void ima_file_free(struct file *file) struct inode *inode = file->f_dentry->d_inode; struct ima_iint_cache *iint; - if (!ima_initialized || !S_ISREG(inode->i_mode)) + if (!iint_initialized || !S_ISREG(inode->i_mode)) return; iint = ima_iint_find_get(inode); if (!iint) @@ -153,129 +227,12 @@ void ima_file_free(struct file *file) kref_put(&iint->refcount, iint_free); } -/* ima_read_write_check - reflect possible reading/writing errors in the PCR. - * - * When opening a file for read, if the file is already open for write, - * the file could change, resulting in a file measurement error. - * - * Opening a file for write, if the file is already open for read, results - * in a time of measure, time of use (ToMToU) error. - * - * In either case invalidate the PCR. - */ -enum iint_pcr_error { TOMTOU, OPEN_WRITERS }; -static void ima_read_write_check(enum iint_pcr_error error, - struct ima_iint_cache *iint, - struct inode *inode, - const unsigned char *filename) -{ - switch (error) { - case TOMTOU: - if (iint->readcount > 0) - ima_add_violation(inode, filename, "invalid_pcr", - "ToMToU"); - break; - case OPEN_WRITERS: - if (iint->writecount > 0) - ima_add_violation(inode, filename, "invalid_pcr", - "open_writers"); - break; - } -} - -static int get_path_measurement(struct ima_iint_cache *iint, struct file *file, - const unsigned char *filename) -{ - int rc = 0; - - ima_inc_counts(iint, file->f_mode); - - rc = ima_collect_measurement(iint, file); - if (!rc) - ima_store_measurement(iint, file, filename); - return rc; -} - -/** - * ima_path_check - based on policy, collect/store measurement. - * @path: contains a pointer to the path to be measured - * @mask: contains MAY_READ, MAY_WRITE or MAY_EXECUTE - * - * Measure the file being open for readonly, based on the - * ima_must_measure() policy decision. - * - * Keep read/write counters for all files, but only - * invalidate the PCR for measured files: - * - Opening a file for write when already open for read, - * results in a time of measure, time of use (ToMToU) error. - * - Opening a file for read when already open for write, - * could result in a file measurement error. - * - * Always return 0 and audit dentry_open failures. - * (Return code will be based upon measurement appraisal.) - */ -int ima_path_check(struct path *path, int mask) -{ - struct inode *inode = path->dentry->d_inode; - struct ima_iint_cache *iint; - struct file *file = NULL; - int rc; - - if (!ima_initialized || !S_ISREG(inode->i_mode)) - return 0; - iint = ima_iint_find_get(inode); - if (!iint) - return 0; - - mutex_lock(&iint->mutex); - - rc = ima_must_measure(iint, inode, MAY_READ, PATH_CHECK); - if (rc < 0) - goto out; - - if ((mask & MAY_WRITE) || (mask == 0)) - ima_read_write_check(TOMTOU, iint, inode, - path->dentry->d_name.name); - - if ((mask & (MAY_WRITE | MAY_READ | MAY_EXEC)) != MAY_READ) - goto out; - - ima_read_write_check(OPEN_WRITERS, iint, inode, - path->dentry->d_name.name); - if (!(iint->flags & IMA_MEASURED)) { - struct dentry *dentry = dget(path->dentry); - struct vfsmount *mnt = mntget(path->mnt); - - file = dentry_open(dentry, mnt, O_RDONLY | O_LARGEFILE, - current_cred()); - if (IS_ERR(file)) { - int audit_info = 0; - - integrity_audit_msg(AUDIT_INTEGRITY_PCR, inode, - dentry->d_name.name, - "add_measurement", - "dentry_open failed", - 1, audit_info); - file = NULL; - goto out; - } - rc = get_path_measurement(iint, file, dentry->d_name.name); - } -out: - mutex_unlock(&iint->mutex); - if (file) - fput(file); - kref_put(&iint->refcount, iint_free); - return 0; -} -EXPORT_SYMBOL_GPL(ima_path_check); - static int process_measurement(struct file *file, const unsigned char *filename, int mask, int function) { struct inode *inode = file->f_dentry->d_inode; struct ima_iint_cache *iint; - int rc; + int rc = 0; if (!ima_initialized || !S_ISREG(inode->i_mode)) return 0; @@ -297,33 +254,6 @@ out: return rc; } -/* - * ima_counts_get - increment file counts - * - * - for IPC shm and shmat file. - * - for nfsd exported files. - * - * Increment the counts for these files to prevent unnecessary - * imbalance messages. - */ -void ima_counts_get(struct file *file) -{ - struct inode *inode = file->f_dentry->d_inode; - struct ima_iint_cache *iint; - - if (!ima_initialized || !S_ISREG(inode->i_mode)) - return; - iint = ima_iint_find_get(inode); - if (!iint) - return; - mutex_lock(&iint->mutex); - ima_inc_counts(iint, file->f_mode); - mutex_unlock(&iint->mutex); - - kref_put(&iint->refcount, iint_free); -} -EXPORT_SYMBOL_GPL(ima_counts_get); - /** * ima_file_mmap - based on policy, collect/store measurement. * @file: pointer to the file to be measured (May be NULL) @@ -369,11 +299,31 @@ int ima_bprm_check(struct linux_binprm *bprm) return 0; } +/** + * ima_path_check - based on policy, collect/store measurement. + * @file: pointer to the file to be measured + * @mask: contains MAY_READ, MAY_WRITE or MAY_EXECUTE + * + * Measure files based on the ima_must_measure() policy decision. + * + * Always return 0 and audit dentry_open failures. + * (Return code will be based upon measurement appraisal.) + */ +int ima_file_check(struct file *file, int mask) +{ + int rc; + + rc = process_measurement(file, file->f_dentry->d_name.name, + mask & (MAY_READ | MAY_WRITE | MAY_EXEC), + FILE_CHECK); + return 0; +} +EXPORT_SYMBOL_GPL(ima_file_check); + static int __init init_ima(void) { int error; - ima_iintcache_init(); error = ima_init(); ima_initialized = 1; return error; diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index e1278399b345..aef8c0a923ab 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -15,6 +15,7 @@ #include <linux/security.h> #include <linux/magic.h> #include <linux/parser.h> +#include <linux/slab.h> #include "ima.h" @@ -67,7 +68,7 @@ static struct ima_measure_rule_entry default_rules[] = { .flags = IMA_FUNC | IMA_MASK}, {.action = MEASURE,.func = BPRM_CHECK,.mask = MAY_EXEC, .flags = IMA_FUNC | IMA_MASK}, - {.action = MEASURE,.func = PATH_CHECK,.mask = MAY_READ,.uid = 0, + {.action = MEASURE,.func = FILE_CHECK,.mask = MAY_READ,.uid = 0, .flags = IMA_FUNC | IMA_MASK | IMA_UID}, }; @@ -245,6 +246,9 @@ static int ima_lsm_rule_init(struct ima_measure_rule_entry *entry, { int result; + if (entry->lsm[lsm_rule].rule) + return -EINVAL; + entry->lsm[lsm_rule].type = audit_type; result = security_filter_rule_init(entry->lsm[lsm_rule].type, Audit_equal, args, @@ -252,6 +256,13 @@ static int ima_lsm_rule_init(struct ima_measure_rule_entry *entry, return result; } +static void ima_log_string(struct audit_buffer *ab, char *key, char *value) +{ + audit_log_format(ab, "%s=", key); + audit_log_untrustedstring(ab, value); + audit_log_format(ab, " "); +} + static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry) { struct audit_buffer *ab; @@ -260,30 +271,46 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry) ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_RULE); - entry->action = -1; - while ((p = strsep(&rule, " \n")) != NULL) { + entry->uid = -1; + entry->action = UNKNOWN; + while ((p = strsep(&rule, " \t")) != NULL) { substring_t args[MAX_OPT_ARGS]; int token; unsigned long lnum; if (result < 0) break; - if (!*p) + if ((*p == '\0') || (*p == ' ') || (*p == '\t')) continue; token = match_token(p, policy_tokens, args); switch (token) { case Opt_measure: - audit_log_format(ab, "%s ", "measure"); + ima_log_string(ab, "action", "measure"); + + if (entry->action != UNKNOWN) + result = -EINVAL; + entry->action = MEASURE; break; case Opt_dont_measure: - audit_log_format(ab, "%s ", "dont_measure"); + ima_log_string(ab, "action", "dont_measure"); + + if (entry->action != UNKNOWN) + result = -EINVAL; + entry->action = DONT_MEASURE; break; case Opt_func: - audit_log_format(ab, "func=%s ", args[0].from); - if (strcmp(args[0].from, "PATH_CHECK") == 0) - entry->func = PATH_CHECK; + ima_log_string(ab, "func", args[0].from); + + if (entry->func) + result = -EINVAL; + + if (strcmp(args[0].from, "FILE_CHECK") == 0) + entry->func = FILE_CHECK; + /* PATH_CHECK is for backwards compat */ + else if (strcmp(args[0].from, "PATH_CHECK") == 0) + entry->func = FILE_CHECK; else if (strcmp(args[0].from, "FILE_MMAP") == 0) entry->func = FILE_MMAP; else if (strcmp(args[0].from, "BPRM_CHECK") == 0) @@ -294,7 +321,11 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry) entry->flags |= IMA_FUNC; break; case Opt_mask: - audit_log_format(ab, "mask=%s ", args[0].from); + ima_log_string(ab, "mask", args[0].from); + + if (entry->mask) + result = -EINVAL; + if ((strcmp(args[0].from, "MAY_EXEC")) == 0) entry->mask = MAY_EXEC; else if (strcmp(args[0].from, "MAY_WRITE") == 0) @@ -309,14 +340,26 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry) entry->flags |= IMA_MASK; break; case Opt_fsmagic: - audit_log_format(ab, "fsmagic=%s ", args[0].from); + ima_log_string(ab, "fsmagic", args[0].from); + + if (entry->fsmagic) { + result = -EINVAL; + break; + } + result = strict_strtoul(args[0].from, 16, &entry->fsmagic); if (!result) entry->flags |= IMA_FSMAGIC; break; case Opt_uid: - audit_log_format(ab, "uid=%s ", args[0].from); + ima_log_string(ab, "uid", args[0].from); + + if (entry->uid != -1) { + result = -EINVAL; + break; + } + result = strict_strtoul(args[0].from, 10, &lnum); if (!result) { entry->uid = (uid_t) lnum; @@ -327,50 +370,51 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry) } break; case Opt_obj_user: - audit_log_format(ab, "obj_user=%s ", args[0].from); + ima_log_string(ab, "obj_user", args[0].from); result = ima_lsm_rule_init(entry, args[0].from, LSM_OBJ_USER, AUDIT_OBJ_USER); break; case Opt_obj_role: - audit_log_format(ab, "obj_role=%s ", args[0].from); + ima_log_string(ab, "obj_role", args[0].from); result = ima_lsm_rule_init(entry, args[0].from, LSM_OBJ_ROLE, AUDIT_OBJ_ROLE); break; case Opt_obj_type: - audit_log_format(ab, "obj_type=%s ", args[0].from); + ima_log_string(ab, "obj_type", args[0].from); result = ima_lsm_rule_init(entry, args[0].from, LSM_OBJ_TYPE, AUDIT_OBJ_TYPE); break; case Opt_subj_user: - audit_log_format(ab, "subj_user=%s ", args[0].from); + ima_log_string(ab, "subj_user", args[0].from); result = ima_lsm_rule_init(entry, args[0].from, LSM_SUBJ_USER, AUDIT_SUBJ_USER); break; case Opt_subj_role: - audit_log_format(ab, "subj_role=%s ", args[0].from); + ima_log_string(ab, "subj_role", args[0].from); result = ima_lsm_rule_init(entry, args[0].from, LSM_SUBJ_ROLE, AUDIT_SUBJ_ROLE); break; case Opt_subj_type: - audit_log_format(ab, "subj_type=%s ", args[0].from); + ima_log_string(ab, "subj_type", args[0].from); result = ima_lsm_rule_init(entry, args[0].from, LSM_SUBJ_TYPE, AUDIT_SUBJ_TYPE); break; case Opt_err: - audit_log_format(ab, "UNKNOWN=%s ", p); + ima_log_string(ab, "UNKNOWN", p); + result = -EINVAL; break; } } - if (entry->action == UNKNOWN) + if (!result && (entry->action == UNKNOWN)) result = -EINVAL; - audit_log_format(ab, "res=%d", !result ? 0 : 1); + audit_log_format(ab, "res=%d", !!result); audit_log_end(ab); return result; } @@ -380,13 +424,14 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry) * @rule - ima measurement policy rule * * Uses a mutex to protect the policy list from multiple concurrent writers. - * Returns 0 on success, an error code on failure. + * Returns the length of the rule parsed, an error code on failure */ -int ima_parse_add_rule(char *rule) +ssize_t ima_parse_add_rule(char *rule) { const char *op = "update_policy"; + char *p; struct ima_measure_rule_entry *entry; - int result = 0; + ssize_t result, len; int audit_info = 0; /* Prevent installed policy from changing */ @@ -406,18 +451,28 @@ int ima_parse_add_rule(char *rule) INIT_LIST_HEAD(&entry->list); - result = ima_parse_rule(rule, entry); - if (!result) { - mutex_lock(&ima_measure_mutex); - list_add_tail(&entry->list, &measure_policy_rules); - mutex_unlock(&ima_measure_mutex); - } else { + p = strsep(&rule, "\n"); + len = strlen(p) + 1; + + if (*p == '#') { + kfree(entry); + return len; + } + + result = ima_parse_rule(p, entry); + if (result) { kfree(entry); integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL, op, "invalid policy", result, audit_info); + return result; } - return result; + + mutex_lock(&ima_measure_mutex); + list_add_tail(&entry->list, &measure_policy_rules); + mutex_unlock(&ima_measure_mutex); + + return len; } /* ima_delete_rules called to cleanup invalid policy */ diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index a0880e9c8e05..8e28f04a5e2e 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -20,6 +20,7 @@ */ #include <linux/module.h> #include <linux/rculist.h> +#include <linux/slab.h> #include "ima.h" LIST_HEAD(ima_measurements); /* list of all measurements */ @@ -70,7 +71,7 @@ static int ima_add_digest_entry(struct ima_template_entry *entry) qe = kmalloc(sizeof(*qe), GFP_KERNEL); if (qe == NULL) { - pr_err("OUT OF MEMORY ERROR creating queue entry.\n"); + pr_err("IMA: OUT OF MEMORY ERROR creating queue entry.\n"); return -ENOMEM; } qe->entry = entry; @@ -93,7 +94,7 @@ static int ima_pcr_extend(const u8 *hash) result = tpm_pcr_extend(TPM_ANY_NUM, CONFIG_IMA_MEASURE_PCR_IDX, hash); if (result != 0) - pr_err("Error Communicating to TPM chip\n"); + pr_err("IMA: Error Communicating to TPM chip\n"); return result; } |