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ima: Move file-change detection variables into new structure

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Move all the variables used for file change detection into a structure
that can be used by IMA and EVM. Implement an inline function for storing
the identification of an inode and one for detecting changes to an inode
based on this new structure.

Co-developed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Stefan Berger
2024-02-23 12:25:08 -05:00
committed by Mimi Zohar
parent faf994811e
commit 309e2b775d
5 changed files with 44 additions and 13 deletions
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34
include/linux/integrity.h
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@@ -8,6 +8,7 @@
#define _LINUX_INTEGRITY_H
#include <linux/fs.h>
#include <linux/iversion.h>
enum integrity_status {
INTEGRITY_PASS = 0,
@@ -28,4 +29,37 @@ static inline void integrity_load_keys(void)
}
#endif /* CONFIG_INTEGRITY */
/* An inode's attributes for detection of changes */
struct integrity_inode_attributes {
u64 version; /* track inode changes */
unsigned long ino;
dev_t dev;
};
/*
* On stacked filesystems the i_version alone is not enough to detect file data
* or metadata change. Additional metadata is required.
*/
static inline void
integrity_inode_attrs_store(struct integrity_inode_attributes *attrs,
u64 i_version, const struct inode *inode)
{
attrs->version = i_version;
attrs->dev = inode->i_sb->s_dev;
attrs->ino = inode->i_ino;
}
/*
* On stacked filesystems detect whether the inode or its content has changed.
*/
static inline bool
integrity_inode_attrs_changed(const struct integrity_inode_attributes *attrs,
const struct inode *inode)
{
return (inode->i_sb->s_dev != attrs->dev ||
inode->i_ino != attrs->ino ||
!inode_eq_iversion(inode, attrs->version));
}
#endif /* _LINUX_INTEGRITY_H */