From a175b8bb29ebbad380ab4788f307fbfc47997b19 Mon Sep 17 00:00:00 2001 From: Dmitry Kasatkin Date: Thu, 27 Sep 2012 15:06:28 +0300 Subject: [PATCH] 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 Signed-off-by: Mimi Zohar --- security/integrity/ima/ima_main.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index d743c9a0a4b4..cd00ba39e8e0 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))