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| author | Stefan Berger <stefanb@linux.ibm.com> | 2024-02-23 12:25:10 -0500 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2024-04-09 17:14:57 -0400 |
| commit | cd9b909a117210bfd77a89bb06a3154c1fc51b51 (patch) | |
| tree | e258bd0296c3401b5ab9352bb282ad0ad14b96cd /security | |
| parent | a652aa59068bd78d96a1ab6ea7c0c4d3c79fb5e8 (diff) | |
| download | lwn-cd9b909a117210bfd77a89bb06a3154c1fc51b51.tar.gz lwn-cd9b909a117210bfd77a89bb06a3154c1fc51b51.zip | |
ima: re-evaluate file integrity on file metadata change
Force a file's integrity to be re-evaluated on file metadata change by
resetting both the IMA and EVM status flags.
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>
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/ima_main.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 4b215d85c14b..f04f43af651c 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -26,6 +26,7 @@ #include <linux/ima.h> #include <linux/fs.h> #include <linux/iversion.h> +#include <linux/evm.h> #include "ima.h" @@ -211,6 +212,7 @@ static int process_measurement(struct file *file, const struct cred *cred, struct inode *real_inode, *inode = file_inode(file); struct ima_iint_cache *iint = NULL; struct ima_template_desc *template_desc = NULL; + struct inode *metadata_inode; char *pathbuf = NULL; char filename[NAME_MAX]; const char *pathname = NULL; @@ -286,7 +288,8 @@ static int process_measurement(struct file *file, const struct cred *cred, } /* - * On stacked filesystems, detect and re-evaluate file data changes. + * On stacked filesystems, detect and re-evaluate file data and + * metadata changes. */ real_inode = d_real_inode(file_dentry(file)); if (real_inode != inode && @@ -297,6 +300,15 @@ static int process_measurement(struct file *file, const struct cred *cred, iint->flags &= ~IMA_DONE_MASK; iint->measured_pcrs = 0; } + + /* + * Reset the EVM status when metadata changed. + */ + metadata_inode = d_inode(d_real(file_dentry(file), + D_REAL_METADATA)); + if (evm_metadata_changed(inode, metadata_inode)) + iint->flags &= ~(IMA_APPRAISED | + IMA_APPRAISED_SUBMASK); } /* Determine if already appraised/measured based on bitmask |