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authorDmitry Kasatkin <dmitry.kasatkin@intel.com>2012-09-27 15:06:28 +0300
committerMimi Zohar <zohar@linux.vnet.ibm.com>2013-01-16 17:50:05 -0500
commita175b8bb29ebbad380ab4788f307fbfc47997b19 (patch)
tree8e0dbb1def59d05412e57ff2f9fc089bb304bffa /security/integrity
parentea1046d4c57ee6e3d5f68f19dd9a45bbab0b71a0 (diff)
downloadvexpress-lsk-a175b8bb29ebbad380ab4788f307fbfc47997b19.tar.gz
ima: forbid write access to files with digital signatures
This patch forbids write access to files with digital signatures, as they are considered immutable. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity')
-rw-r--r--security/integrity/ima/ima_main.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index d743c9a0a4b..cd00ba39e8e 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -175,12 +175,12 @@ static int process_measurement(struct file *file, const char *filename,
if (!action) {
if (iint->flags & IMA_APPRAISED)
rc = iint->ima_status;
- goto out;
+ goto out_digsig;
}
rc = ima_collect_measurement(iint, file);
if (rc != 0)
- goto out;
+ goto out_digsig;
if (function != BPRM_CHECK)
pathname = ima_d_path(&file->f_path, &pathbuf);
@@ -195,6 +195,9 @@ static int process_measurement(struct file *file, const char *filename,
if (action & IMA_AUDIT)
ima_audit_measurement(iint, pathname);
kfree(pathbuf);
+out_digsig:
+ if ((mask & MAY_WRITE) && (iint->flags & IMA_DIGSIG))
+ rc = -EACCES;
out:
mutex_unlock(&inode->i_mutex);
if ((rc && must_appraise) && (ima_appraise & IMA_APPRAISE_ENFORCE))