diff options
Diffstat (limited to 'security')
| -rw-r--r-- | security/Makefile | 3 | ||||
| -rw-r--r-- | security/integrity/ima/ima.h | 3 | ||||
| -rw-r--r-- | security/integrity/ima/ima_iint.c | 79 | ||||
| -rw-r--r-- | security/integrity/ima/ima_main.c | 184 | ||||
| -rw-r--r-- | security/keys/keyctl.c | 12 | ||||
| -rw-r--r-- | security/min_addr.c | 2 |
6 files changed, 129 insertions, 154 deletions
diff --git a/security/Makefile b/security/Makefile index bb44e350c618..da20a193c8dd 100644 --- a/security/Makefile +++ b/security/Makefile @@ -8,7 +8,8 @@ subdir-$(CONFIG_SECURITY_SMACK) += smack subdir-$(CONFIG_SECURITY_TOMOYO) += tomoyo # always enable default capabilities -obj-y += commoncap.o min_addr.o +obj-y += commoncap.o +obj-$(CONFIG_MMU) += min_addr.o # Object file lists obj-$(CONFIG_SECURITY) += security.o capability.o diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 165eb5397ea5..c41afe6639a0 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -97,7 +97,6 @@ static inline unsigned long ima_hash_key(u8 *digest) /* iint cache flags */ #define IMA_MEASURED 1 -#define IMA_IINT_DUMP_STACK 512 /* integrity data associated with an inode */ struct ima_iint_cache { @@ -128,8 +127,6 @@ void ima_template_show(struct seq_file *m, void *e, */ struct ima_iint_cache *ima_iint_insert(struct inode *inode); struct ima_iint_cache *ima_iint_find_get(struct inode *inode); -struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode); -void ima_iint_delete(struct inode *inode); void iint_free(struct kref *kref); void iint_rcu_free(struct rcu_head *rcu); diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c index a4e2b1dac943..fa592ff1ac1c 100644 --- a/security/integrity/ima/ima_iint.c +++ b/security/integrity/ima/ima_iint.c @@ -19,8 +19,6 @@ #include <linux/radix-tree.h> #include "ima.h" -#define ima_iint_delete ima_inode_free - RADIX_TREE(ima_iint_store, GFP_ATOMIC); DEFINE_SPINLOCK(ima_iint_lock); @@ -45,22 +43,21 @@ out: return iint; } -/* Allocate memory for the iint associated with the inode - * from the iint_cache slab, initialize the iint, and - * insert it into the radix tree. - * - * On success return a pointer to the iint; on failure return NULL. +/** + * ima_inode_alloc - allocate an iint associated with an inode + * @inode: pointer to the inode */ -struct ima_iint_cache *ima_iint_insert(struct inode *inode) +int ima_inode_alloc(struct inode *inode) { struct ima_iint_cache *iint = NULL; int rc = 0; if (!ima_initialized) - return iint; + return 0; + iint = kmem_cache_alloc(iint_cache, GFP_NOFS); if (!iint) - return iint; + return -ENOMEM; rc = radix_tree_preload(GFP_NOFS); if (rc < 0) @@ -70,65 +67,13 @@ struct ima_iint_cache *ima_iint_insert(struct inode *inode) rc = radix_tree_insert(&ima_iint_store, (unsigned long)inode, iint); spin_unlock(&ima_iint_lock); out: - if (rc < 0) { + if (rc < 0) kmem_cache_free(iint_cache, iint); - if (rc == -EEXIST) { - spin_lock(&ima_iint_lock); - iint = radix_tree_lookup(&ima_iint_store, - (unsigned long)inode); - spin_unlock(&ima_iint_lock); - } else - iint = NULL; - } - radix_tree_preload_end(); - return iint; -} - -/** - * ima_inode_alloc - allocate an iint associated with an inode - * @inode: pointer to the inode - * - * Return 0 on success, 1 on failure. - */ -int ima_inode_alloc(struct inode *inode) -{ - struct ima_iint_cache *iint; - - if (!ima_initialized) - return 0; - - iint = ima_iint_insert(inode); - if (!iint) - return 1; - return 0; -} - -/* ima_iint_find_insert_get - get the iint associated with an inode - * - * Most insertions are done at inode_alloc, except those allocated - * before late_initcall. When the iint does not exist, allocate it, - * initialize and insert it, and increment the iint refcount. - * - * (Can't initialize at security_initcall before any inodes are - * allocated, got to wait at least until proc_init.) - * - * Return the iint. - */ -struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode) -{ - struct ima_iint_cache *iint = NULL; - iint = ima_iint_find_get(inode); - if (iint) - return iint; - - iint = ima_iint_insert(inode); - if (iint) - kref_get(&iint->refcount); + radix_tree_preload_end(); - return iint; + return rc; } -EXPORT_SYMBOL_GPL(ima_iint_find_insert_get); /* iint_free - called when the iint refcount goes to zero */ void iint_free(struct kref *kref) @@ -164,12 +109,12 @@ void iint_rcu_free(struct rcu_head *rcu_head) } /** - * ima_iint_delete - called on integrity_inode_free + * ima_inode_free - called on security_inode_free * @inode: pointer to the inode * * Free the integrity information(iint) associated with an inode. */ -void ima_iint_delete(struct inode *inode) +void ima_inode_free(struct inode *inode) { struct ima_iint_cache *iint; diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index b85e61bcf246..a89f44d5e030 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -13,8 +13,8 @@ * License. * * File: ima_main.c - * implements the IMA hooks: ima_bprm_check, ima_file_mmap, - * and ima_path_check. + * implements the IMA hooks: ima_bprm_check, ima_file_mmap, + * and ima_path_check. */ #include <linux/module.h> #include <linux/file.h> @@ -35,6 +35,100 @@ static int __init hash_setup(char *str) } __setup("ima_hash=", hash_setup); +struct ima_imbalance { + struct hlist_node node; + unsigned long fsmagic; +}; + +/* + * ima_limit_imbalance - emit one imbalance message per filesystem type + * + * Maintain list of filesystem types that do not measure files properly. + * Return false if unknown, true if known. + */ +static bool ima_limit_imbalance(struct file *file) +{ + static DEFINE_SPINLOCK(ima_imbalance_lock); + static HLIST_HEAD(ima_imbalance_list); + + struct super_block *sb = file->f_dentry->d_sb; + struct ima_imbalance *entry; + struct hlist_node *node; + bool found = false; + + rcu_read_lock(); + hlist_for_each_entry_rcu(entry, node, &ima_imbalance_list, node) { + if (entry->fsmagic == sb->s_magic) { + found = true; + break; + } + } + rcu_read_unlock(); + if (found) + goto out; + + entry = kmalloc(sizeof(*entry), GFP_NOFS); + if (!entry) + goto out; + entry->fsmagic = sb->s_magic; + spin_lock(&ima_imbalance_lock); + /* + * we could have raced and something else might have added this fs + * to the list, but we don't really care + */ + hlist_add_head_rcu(&entry->node, &ima_imbalance_list); + spin_unlock(&ima_imbalance_lock); + printk(KERN_INFO "IMA: unmeasured files on fsmagic: %lX\n", + entry->fsmagic); +out: + return found; +} + +/* + * Update the counts given an fmode_t + */ +static void ima_inc_counts(struct ima_iint_cache *iint, fmode_t mode) +{ + BUG_ON(!mutex_is_locked(&iint->mutex)); + + iint->opencount++; + if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) + iint->readcount++; + if (mode & FMODE_WRITE) + iint->writecount++; +} + +/* + * Decrement ima counts + */ +static void ima_dec_counts(struct ima_iint_cache *iint, struct inode *inode, + struct file *file) +{ + mode_t mode = file->f_mode; + BUG_ON(!mutex_is_locked(&iint->mutex)); + + iint->opencount--; + if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) + iint->readcount--; + if (mode & FMODE_WRITE) { + iint->writecount--; + if (iint->writecount == 0) { + if (iint->version != inode->i_version) + iint->flags &= ~IMA_MEASURED; + } + } + + if (((iint->opencount < 0) || + (iint->readcount < 0) || + (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, + iint->opencount); + dump_stack(); + } +} + /** * ima_file_free - called on __fput() * @file: pointer to file structure being freed @@ -54,29 +148,7 @@ void ima_file_free(struct file *file) return; mutex_lock(&iint->mutex); - if (iint->opencount <= 0) { - printk(KERN_INFO - "%s: %s open/free imbalance (r:%ld w:%ld o:%ld f:%ld)\n", - __FUNCTION__, file->f_dentry->d_name.name, - iint->readcount, iint->writecount, - iint->opencount, atomic_long_read(&file->f_count)); - if (!(iint->flags & IMA_IINT_DUMP_STACK)) { - dump_stack(); - iint->flags |= IMA_IINT_DUMP_STACK; - } - } - iint->opencount--; - - if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) - iint->readcount--; - - if (file->f_mode & FMODE_WRITE) { - iint->writecount--; - if (iint->writecount == 0) { - if (iint->version != inode->i_version) - iint->flags &= ~IMA_MEASURED; - } - } + ima_dec_counts(iint, inode, file); mutex_unlock(&iint->mutex); kref_put(&iint->refcount, iint_free); } @@ -116,8 +188,7 @@ static int get_path_measurement(struct ima_iint_cache *iint, struct file *file, { int rc = 0; - iint->opencount++; - iint->readcount++; + ima_inc_counts(iint, file->f_mode); rc = ima_collect_measurement(iint, file); if (!rc) @@ -125,15 +196,6 @@ static int get_path_measurement(struct ima_iint_cache *iint, struct file *file, return rc; } -static void ima_update_counts(struct ima_iint_cache *iint, int mask) -{ - iint->opencount++; - if ((mask & MAY_WRITE) || (mask == 0)) - iint->writecount++; - else if (mask & (MAY_READ | MAY_EXEC)) - iint->readcount++; -} - /** * ima_path_check - based on policy, collect/store measurement. * @path: contains a pointer to the path to be measured @@ -152,7 +214,7 @@ static void ima_update_counts(struct ima_iint_cache *iint, int mask) * 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, int update_counts) +int ima_path_check(struct path *path, int mask) { struct inode *inode = path->dentry->d_inode; struct ima_iint_cache *iint; @@ -161,13 +223,11 @@ int ima_path_check(struct path *path, int mask, int update_counts) if (!ima_initialized || !S_ISREG(inode->i_mode)) return 0; - iint = ima_iint_find_insert_get(inode); + iint = ima_iint_find_get(inode); if (!iint) return 0; mutex_lock(&iint->mutex); - if (update_counts) - ima_update_counts(iint, mask); rc = ima_must_measure(iint, inode, MAY_READ, PATH_CHECK); if (rc < 0) @@ -219,7 +279,7 @@ static int process_measurement(struct file *file, const unsigned char *filename, if (!ima_initialized || !S_ISREG(inode->i_mode)) return 0; - iint = ima_iint_find_insert_get(inode); + iint = ima_iint_find_get(inode); if (!iint) return -ENOMEM; @@ -238,39 +298,6 @@ out: } /* - * ima_counts_put - decrement file counts - * - * File counts are incremented in ima_path_check. On file open - * error, such as ETXTBSY, decrement the counts to prevent - * unnecessary imbalance messages. - */ -void ima_counts_put(struct path *path, int mask) -{ - struct inode *inode = path->dentry->d_inode; - struct ima_iint_cache *iint; - - /* The inode may already have been freed, freeing the iint - * with it. Verify the inode is not NULL before dereferencing - * it. - */ - if (!ima_initialized || !inode || !S_ISREG(inode->i_mode)) - return; - iint = ima_iint_find_insert_get(inode); - if (!iint) - return; - - mutex_lock(&iint->mutex); - iint->opencount--; - if ((mask & MAY_WRITE) || (mask == 0)) - iint->writecount--; - else if (mask & (MAY_READ | MAY_EXEC)) - iint->readcount--; - mutex_unlock(&iint->mutex); - - kref_put(&iint->refcount, iint_free); -} - -/* * ima_counts_get - increment file counts * * - for IPC shm and shmat file. @@ -286,16 +313,11 @@ void ima_counts_get(struct file *file) if (!ima_initialized || !S_ISREG(inode->i_mode)) return; - iint = ima_iint_find_insert_get(inode); + iint = ima_iint_find_get(inode); if (!iint) return; mutex_lock(&iint->mutex); - iint->opencount++; - if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) - iint->readcount++; - - if (file->f_mode & FMODE_WRITE) - iint->writecount++; + ima_inc_counts(iint, file->f_mode); mutex_unlock(&iint->mutex); kref_put(&iint->refcount, iint_free); diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index 06ec722897be..e9c2e7c584d9 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -1194,7 +1194,7 @@ long keyctl_get_security(key_serial_t keyid, * have the authorisation token handy */ instkey = key_get_instantiation_authkey(keyid); if (IS_ERR(instkey)) - return PTR_ERR(key_ref); + return PTR_ERR(instkey); key_put(instkey); key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); @@ -1236,6 +1236,7 @@ long keyctl_get_security(key_serial_t keyid, */ long keyctl_session_to_parent(void) { +#ifdef TIF_NOTIFY_RESUME struct task_struct *me, *parent; const struct cred *mycred, *pcred; struct cred *cred, *oldcred; @@ -1326,6 +1327,15 @@ not_permitted: error_keyring: key_ref_put(keyring_r); return ret; + +#else /* !TIF_NOTIFY_RESUME */ + /* + * To be removed when TIF_NOTIFY_RESUME has been implemented on + * m68k/xtensa + */ +#warning TIF_NOTIFY_RESUME not implemented + return -EOPNOTSUPP; +#endif /* !TIF_NOTIFY_RESUME */ } /*****************************************************************************/ diff --git a/security/min_addr.c b/security/min_addr.c index fc43c9d37084..e86f297522bf 100644 --- a/security/min_addr.c +++ b/security/min_addr.c @@ -43,7 +43,7 @@ int mmap_min_addr_handler(struct ctl_table *table, int write, return ret; } -int __init init_mmap_min_addr(void) +static int __init init_mmap_min_addr(void) { update_mmap_min_addr(); |