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IMA: define a hook to measure kernel integrity critical data

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IMA provides capabilities to measure file and buffer data.  However,
various data structures, policies, and states stored in kernel memory
also impact the integrity of the system.  Several kernel subsystems
contain such integrity critical data.  These kernel subsystems help
protect the integrity of the system.  Currently, IMA does not provide a
generic function for measuring kernel integrity critical data.

Define ima_measure_critical_data, a new IMA hook, to measure kernel
integrity critical data.

Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com>
Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Tushar Sugandhi
2021-01-07 20:07:03 -08:00
committed by Mimi Zohar
parent 291af651b3
commit d6e645012d
4 changed files with 33 additions and 1 deletions
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7
include/linux/ima.h
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@@ -31,6 +31,9 @@ extern void ima_post_path_mknod(struct dentry *dentry);
extern int ima_file_hash(struct file *file, char *buf, size_t buf_size);
extern int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size);
extern void ima_kexec_cmdline(int kernel_fd, const void *buf, int size);
extern void ima_measure_critical_data(const char *event_name,
const void *buf, size_t buf_len,
bool hash);
#ifdef CONFIG_IMA_APPRAISE_BOOTPARAM
extern void ima_appraise_parse_cmdline(void);
@@ -128,6 +131,10 @@ static inline int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size
}
static inline void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) {}
static inline void ima_measure_critical_data(const char *event_name,
const void *buf, size_t buf_len,
bool hash) {}
#endif /* CONFIG_IMA */
#ifndef CONFIG_IMA_KEXEC