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453 lines
14 KiB
453 lines
14 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2005,2006,2007,2008 IBM Corporation |
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* |
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* Authors: |
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* Reiner Sailer <[email protected]> |
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* Mimi Zohar <[email protected]> |
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* |
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* File: ima.h |
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* internal Integrity Measurement Architecture (IMA) definitions |
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*/ |
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#ifndef __LINUX_IMA_H |
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#define __LINUX_IMA_H |
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#include <linux/types.h> |
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#include <linux/crypto.h> |
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#include <linux/fs.h> |
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#include <linux/security.h> |
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#include <linux/hash.h> |
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#include <linux/tpm.h> |
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#include <linux/audit.h> |
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#include <crypto/hash_info.h> |
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#include "../integrity.h" |
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enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN, |
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IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII }; |
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enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 }; |
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/* digest size for IMA, fits SHA1 or MD5 */ |
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#define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE |
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#define IMA_EVENT_NAME_LEN_MAX 255 |
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#define IMA_HASH_BITS 10 |
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#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS) |
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#define IMA_TEMPLATE_FIELD_ID_MAX_LEN 16 |
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#define IMA_TEMPLATE_NUM_FIELDS_MAX 15 |
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#define IMA_TEMPLATE_IMA_NAME "ima" |
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#define IMA_TEMPLATE_IMA_FMT "d|n" |
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#define NR_BANKS(chip) ((chip != NULL) ? chip->nr_allocated_banks : 0) |
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/* current content of the policy */ |
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extern int ima_policy_flag; |
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/* bitset of digests algorithms allowed in the setxattr hook */ |
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extern atomic_t ima_setxattr_allowed_hash_algorithms; |
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/* set during initialization */ |
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extern int ima_hash_algo __ro_after_init; |
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extern int ima_sha1_idx __ro_after_init; |
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extern int ima_hash_algo_idx __ro_after_init; |
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extern int ima_extra_slots __ro_after_init; |
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extern int ima_appraise; |
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extern struct tpm_chip *ima_tpm_chip; |
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extern const char boot_aggregate_name[]; |
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/* IMA event related data */ |
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struct ima_event_data { |
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struct integrity_iint_cache *iint; |
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struct file *file; |
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const unsigned char *filename; |
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struct evm_ima_xattr_data *xattr_value; |
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int xattr_len; |
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const struct modsig *modsig; |
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const char *violation; |
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const void *buf; |
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int buf_len; |
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}; |
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/* IMA template field data definition */ |
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struct ima_field_data { |
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u8 *data; |
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u32 len; |
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}; |
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/* IMA template field definition */ |
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struct ima_template_field { |
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const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN]; |
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int (*field_init)(struct ima_event_data *event_data, |
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struct ima_field_data *field_data); |
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void (*field_show)(struct seq_file *m, enum ima_show_type show, |
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struct ima_field_data *field_data); |
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}; |
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/* IMA template descriptor definition */ |
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struct ima_template_desc { |
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struct list_head list; |
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char *name; |
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char *fmt; |
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int num_fields; |
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const struct ima_template_field **fields; |
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}; |
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struct ima_template_entry { |
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int pcr; |
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struct tpm_digest *digests; |
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struct ima_template_desc *template_desc; /* template descriptor */ |
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u32 template_data_len; |
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struct ima_field_data template_data[]; /* template related data */ |
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}; |
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struct ima_queue_entry { |
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struct hlist_node hnext; /* place in hash collision list */ |
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struct list_head later; /* place in ima_measurements list */ |
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struct ima_template_entry *entry; |
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}; |
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extern struct list_head ima_measurements; /* list of all measurements */ |
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/* Some details preceding the binary serialized measurement list */ |
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struct ima_kexec_hdr { |
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u16 version; |
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u16 _reserved0; |
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u32 _reserved1; |
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u64 buffer_size; |
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u64 count; |
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}; |
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extern const int read_idmap[]; |
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#ifdef CONFIG_HAVE_IMA_KEXEC |
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void ima_load_kexec_buffer(void); |
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#else |
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static inline void ima_load_kexec_buffer(void) {} |
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#endif /* CONFIG_HAVE_IMA_KEXEC */ |
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/* |
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* The default binary_runtime_measurements list format is defined as the |
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* platform native format. The canonical format is defined as little-endian. |
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*/ |
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extern bool ima_canonical_fmt; |
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/* Internal IMA function definitions */ |
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int ima_init(void); |
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int ima_fs_init(void); |
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int ima_add_template_entry(struct ima_template_entry *entry, int violation, |
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const char *op, struct inode *inode, |
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const unsigned char *filename); |
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int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); |
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int ima_calc_buffer_hash(const void *buf, loff_t len, |
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struct ima_digest_data *hash); |
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int ima_calc_field_array_hash(struct ima_field_data *field_data, |
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struct ima_template_entry *entry); |
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int ima_calc_boot_aggregate(struct ima_digest_data *hash); |
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void ima_add_violation(struct file *file, const unsigned char *filename, |
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struct integrity_iint_cache *iint, |
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const char *op, const char *cause); |
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int ima_init_crypto(void); |
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void ima_putc(struct seq_file *m, void *data, int datalen); |
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void ima_print_digest(struct seq_file *m, u8 *digest, u32 size); |
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int template_desc_init_fields(const char *template_fmt, |
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const struct ima_template_field ***fields, |
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int *num_fields); |
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struct ima_template_desc *ima_template_desc_current(void); |
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struct ima_template_desc *ima_template_desc_buf(void); |
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struct ima_template_desc *lookup_template_desc(const char *name); |
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bool ima_template_has_modsig(const struct ima_template_desc *ima_template); |
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int ima_restore_measurement_entry(struct ima_template_entry *entry); |
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int ima_restore_measurement_list(loff_t bufsize, void *buf); |
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int ima_measurements_show(struct seq_file *m, void *v); |
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unsigned long ima_get_binary_runtime_size(void); |
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int ima_init_template(void); |
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void ima_init_template_list(void); |
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int __init ima_init_digests(void); |
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int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event, |
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void *lsm_data); |
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/* |
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* used to protect h_table and sha_table |
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*/ |
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extern spinlock_t ima_queue_lock; |
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struct ima_h_table { |
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atomic_long_t len; /* number of stored measurements in the list */ |
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atomic_long_t violations; |
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struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; |
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}; |
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extern struct ima_h_table ima_htable; |
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static inline unsigned int ima_hash_key(u8 *digest) |
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{ |
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/* there is no point in taking a hash of part of a digest */ |
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return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE; |
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} |
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#define __ima_hooks(hook) \ |
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hook(NONE, none) \ |
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hook(FILE_CHECK, file) \ |
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hook(MMAP_CHECK, mmap) \ |
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hook(BPRM_CHECK, bprm) \ |
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hook(CREDS_CHECK, creds) \ |
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hook(POST_SETATTR, post_setattr) \ |
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hook(MODULE_CHECK, module) \ |
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hook(FIRMWARE_CHECK, firmware) \ |
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hook(KEXEC_KERNEL_CHECK, kexec_kernel) \ |
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hook(KEXEC_INITRAMFS_CHECK, kexec_initramfs) \ |
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hook(POLICY_CHECK, policy) \ |
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hook(KEXEC_CMDLINE, kexec_cmdline) \ |
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hook(KEY_CHECK, key) \ |
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hook(CRITICAL_DATA, critical_data) \ |
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hook(SETXATTR_CHECK, setxattr_check) \ |
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hook(MAX_CHECK, none) |
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#define __ima_hook_enumify(ENUM, str) ENUM, |
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#define __ima_stringify(arg) (#arg) |
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#define __ima_hook_measuring_stringify(ENUM, str) \ |
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(__ima_stringify(measuring_ ##str)), |
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enum ima_hooks { |
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__ima_hooks(__ima_hook_enumify) |
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}; |
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static const char * const ima_hooks_measure_str[] = { |
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__ima_hooks(__ima_hook_measuring_stringify) |
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}; |
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static inline const char *func_measure_str(enum ima_hooks func) |
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{ |
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if (func >= MAX_CHECK) |
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return ima_hooks_measure_str[NONE]; |
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return ima_hooks_measure_str[func]; |
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} |
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extern const char *const func_tokens[]; |
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struct modsig; |
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#ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS |
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/* |
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* To track keys that need to be measured. |
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*/ |
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struct ima_key_entry { |
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struct list_head list; |
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void *payload; |
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size_t payload_len; |
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char *keyring_name; |
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}; |
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void ima_init_key_queue(void); |
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bool ima_should_queue_key(void); |
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bool ima_queue_key(struct key *keyring, const void *payload, |
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size_t payload_len); |
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void ima_process_queued_keys(void); |
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#else |
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static inline void ima_init_key_queue(void) {} |
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static inline bool ima_should_queue_key(void) { return false; } |
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static inline bool ima_queue_key(struct key *keyring, |
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const void *payload, |
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size_t payload_len) { return false; } |
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static inline void ima_process_queued_keys(void) {} |
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#endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS */ |
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/* LIM API function definitions */ |
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int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode, |
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const struct cred *cred, u32 secid, int mask, |
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enum ima_hooks func, int *pcr, |
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struct ima_template_desc **template_desc, |
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const char *func_data, unsigned int *allowed_algos); |
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int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func); |
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int ima_collect_measurement(struct integrity_iint_cache *iint, |
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struct file *file, void *buf, loff_t size, |
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enum hash_algo algo, struct modsig *modsig); |
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void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, |
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const unsigned char *filename, |
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struct evm_ima_xattr_data *xattr_value, |
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int xattr_len, const struct modsig *modsig, int pcr, |
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struct ima_template_desc *template_desc); |
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int process_buffer_measurement(struct user_namespace *mnt_userns, |
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struct inode *inode, const void *buf, int size, |
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const char *eventname, enum ima_hooks func, |
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int pcr, const char *func_data, |
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bool buf_hash, u8 *digest, size_t digest_len); |
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void ima_audit_measurement(struct integrity_iint_cache *iint, |
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const unsigned char *filename); |
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int ima_alloc_init_template(struct ima_event_data *event_data, |
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struct ima_template_entry **entry, |
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struct ima_template_desc *template_desc); |
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int ima_store_template(struct ima_template_entry *entry, int violation, |
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struct inode *inode, |
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const unsigned char *filename, int pcr); |
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void ima_free_template_entry(struct ima_template_entry *entry); |
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const char *ima_d_path(const struct path *path, char **pathbuf, char *filename); |
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/* IMA policy related functions */ |
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int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, |
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const struct cred *cred, u32 secid, enum ima_hooks func, |
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int mask, int flags, int *pcr, |
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struct ima_template_desc **template_desc, |
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const char *func_data, unsigned int *allowed_algos); |
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void ima_init_policy(void); |
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void ima_update_policy(void); |
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void ima_update_policy_flags(void); |
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ssize_t ima_parse_add_rule(char *); |
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void ima_delete_rules(void); |
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int ima_check_policy(void); |
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void *ima_policy_start(struct seq_file *m, loff_t *pos); |
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void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos); |
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void ima_policy_stop(struct seq_file *m, void *v); |
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int ima_policy_show(struct seq_file *m, void *v); |
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/* Appraise integrity measurements */ |
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#define IMA_APPRAISE_ENFORCE 0x01 |
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#define IMA_APPRAISE_FIX 0x02 |
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#define IMA_APPRAISE_LOG 0x04 |
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#define IMA_APPRAISE_MODULES 0x08 |
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#define IMA_APPRAISE_FIRMWARE 0x10 |
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#define IMA_APPRAISE_POLICY 0x20 |
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#define IMA_APPRAISE_KEXEC 0x40 |
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#ifdef CONFIG_IMA_APPRAISE |
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int ima_check_blacklist(struct integrity_iint_cache *iint, |
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const struct modsig *modsig, int pcr); |
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int ima_appraise_measurement(enum ima_hooks func, |
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struct integrity_iint_cache *iint, |
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struct file *file, const unsigned char *filename, |
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struct evm_ima_xattr_data *xattr_value, |
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int xattr_len, const struct modsig *modsig); |
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int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode, |
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int mask, enum ima_hooks func); |
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void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); |
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enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, |
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enum ima_hooks func); |
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enum hash_algo ima_get_hash_algo(const struct evm_ima_xattr_data *xattr_value, |
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int xattr_len); |
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int ima_read_xattr(struct dentry *dentry, |
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struct evm_ima_xattr_data **xattr_value); |
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#else |
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static inline int ima_check_blacklist(struct integrity_iint_cache *iint, |
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const struct modsig *modsig, int pcr) |
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{ |
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return 0; |
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} |
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static inline int ima_appraise_measurement(enum ima_hooks func, |
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struct integrity_iint_cache *iint, |
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struct file *file, |
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const unsigned char *filename, |
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struct evm_ima_xattr_data *xattr_value, |
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int xattr_len, |
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const struct modsig *modsig) |
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{ |
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return INTEGRITY_UNKNOWN; |
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} |
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static inline int ima_must_appraise(struct user_namespace *mnt_userns, |
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struct inode *inode, int mask, |
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enum ima_hooks func) |
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{ |
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return 0; |
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} |
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static inline void ima_update_xattr(struct integrity_iint_cache *iint, |
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struct file *file) |
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{ |
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} |
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static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache |
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*iint, |
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enum ima_hooks func) |
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{ |
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return INTEGRITY_UNKNOWN; |
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} |
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static inline enum hash_algo |
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ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len) |
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{ |
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return ima_hash_algo; |
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} |
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static inline int ima_read_xattr(struct dentry *dentry, |
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struct evm_ima_xattr_data **xattr_value) |
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{ |
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return 0; |
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} |
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#endif /* CONFIG_IMA_APPRAISE */ |
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#ifdef CONFIG_IMA_APPRAISE_MODSIG |
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int ima_read_modsig(enum ima_hooks func, const void *buf, loff_t buf_len, |
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struct modsig **modsig); |
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void ima_collect_modsig(struct modsig *modsig, const void *buf, loff_t size); |
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int ima_get_modsig_digest(const struct modsig *modsig, enum hash_algo *algo, |
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const u8 **digest, u32 *digest_size); |
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int ima_get_raw_modsig(const struct modsig *modsig, const void **data, |
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u32 *data_len); |
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void ima_free_modsig(struct modsig *modsig); |
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#else |
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static inline int ima_read_modsig(enum ima_hooks func, const void *buf, |
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loff_t buf_len, struct modsig **modsig) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static inline void ima_collect_modsig(struct modsig *modsig, const void *buf, |
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loff_t size) |
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{ |
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} |
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static inline int ima_get_modsig_digest(const struct modsig *modsig, |
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enum hash_algo *algo, const u8 **digest, |
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u32 *digest_size) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static inline int ima_get_raw_modsig(const struct modsig *modsig, |
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const void **data, u32 *data_len) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static inline void ima_free_modsig(struct modsig *modsig) |
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{ |
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} |
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#endif /* CONFIG_IMA_APPRAISE_MODSIG */ |
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/* LSM based policy rules require audit */ |
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#ifdef CONFIG_IMA_LSM_RULES |
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#define ima_filter_rule_init security_audit_rule_init |
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#define ima_filter_rule_free security_audit_rule_free |
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#define ima_filter_rule_match security_audit_rule_match |
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#else |
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static inline int ima_filter_rule_init(u32 field, u32 op, char *rulestr, |
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void **lsmrule) |
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{ |
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return -EINVAL; |
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} |
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static inline void ima_filter_rule_free(void *lsmrule) |
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{ |
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} |
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static inline int ima_filter_rule_match(u32 secid, u32 field, u32 op, |
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void *lsmrule) |
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{ |
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return -EINVAL; |
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} |
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#endif /* CONFIG_IMA_LSM_RULES */ |
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#ifdef CONFIG_IMA_READ_POLICY |
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#define POLICY_FILE_FLAGS (S_IWUSR | S_IRUSR) |
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#else |
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#define POLICY_FILE_FLAGS S_IWUSR |
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#endif /* CONFIG_IMA_READ_POLICY */ |
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#endif /* __LINUX_IMA_H */
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