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Diffstat (limited to 'security/integrity/ima/ima_main.c')
-rw-r--r--security/integrity/ima/ima_main.c54
1 files changed, 33 insertions, 21 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 2191b36ad1da..03bb52ecf490 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -77,21 +77,19 @@ __setup("ima_hash=", hash_setup);
* could result in a file measurement error.
*
*/
-static void ima_rdwr_violation_check(struct file *file)
+static void ima_rdwr_violation_check(struct file *file,
+ struct integrity_iint_cache *iint,
+ char **pathbuf,
+ const char **pathname)
{
struct inode *inode = file_inode(file);
fmode_t mode = file->f_mode;
bool send_tomtou = false, send_writers = false;
- char *pathbuf = NULL;
- const char *pathname;
-
- if (!S_ISREG(inode->i_mode) || !(ima_policy_flag & IMA_MEASURE))
- return;
if (mode & FMODE_WRITE) {
if (atomic_read(&inode->i_readcount) && IS_IMA(inode)) {
- struct integrity_iint_cache *iint;
- iint = integrity_iint_find(inode);
+ if (!iint)
+ iint = integrity_iint_find(inode);
/* IMA_MEASURE is set from reader side */
if (iint && (iint->flags & IMA_MEASURE))
send_tomtou = true;
@@ -105,14 +103,13 @@ static void ima_rdwr_violation_check(struct file *file)
if (!send_tomtou && !send_writers)
return;
- pathname = ima_d_path(&file->f_path, &pathbuf);
+ *pathname = ima_d_path(&file->f_path, pathbuf);
if (send_tomtou)
- ima_add_violation(file, pathname, "invalid_pcr", "ToMToU");
+ ima_add_violation(file, *pathname, "invalid_pcr", "ToMToU");
if (send_writers)
- ima_add_violation(file, pathname,
+ ima_add_violation(file, *pathname,
"invalid_pcr", "open_writers");
- kfree(pathbuf);
}
static void ima_check_last_writer(struct integrity_iint_cache *iint,
@@ -160,13 +157,14 @@ static int process_measurement(struct file *file, int mask, int function,
int opened)
{
struct inode *inode = file_inode(file);
- struct integrity_iint_cache *iint;
+ struct integrity_iint_cache *iint = NULL;
struct ima_template_desc *template_desc;
char *pathbuf = NULL;
const char *pathname = NULL;
int rc = -ENOMEM, action, must_appraise;
struct evm_ima_xattr_data *xattr_value = NULL, **xattr_ptr = NULL;
int xattr_len = 0;
+ bool violation_check;
if (!ima_policy_flag || !S_ISREG(inode->i_mode))
return 0;
@@ -176,7 +174,9 @@ static int process_measurement(struct file *file, int mask, int function,
* Included is the appraise submask.
*/
action = ima_get_action(inode, mask, function);
- if (!action)
+ violation_check = (function == FILE_CHECK &&
+ (ima_policy_flag & IMA_MEASURE));
+ if (!action && !violation_check)
return 0;
must_appraise = action & IMA_APPRAISE;
@@ -187,9 +187,19 @@ static int process_measurement(struct file *file, int mask, int function,
mutex_lock(&inode->i_mutex);
- iint = integrity_inode_get(inode);
- if (!iint)
- goto out;
+ if (action) {
+ iint = integrity_inode_get(inode);
+ if (!iint)
+ goto out;
+ }
+
+ if (violation_check) {
+ ima_rdwr_violation_check(file, iint, &pathbuf, &pathname);
+ if (!action) {
+ rc = 0;
+ goto out_free;
+ }
+ }
/* Determine if already appraised/measured based on bitmask
* (IMA_MEASURE, IMA_MEASURED, IMA_XXXX_APPRAISE, IMA_XXXX_APPRAISED,
@@ -218,7 +228,8 @@ static int process_measurement(struct file *file, int mask, int function,
goto out_digsig;
}
- pathname = ima_d_path(&file->f_path, &pathbuf);
+ if (!pathname) /* ima_rdwr_violation possibly pre-fetched */
+ pathname = ima_d_path(&file->f_path, &pathbuf);
if (action & IMA_MEASURE)
ima_store_measurement(iint, file, pathname,
@@ -228,13 +239,15 @@ static int process_measurement(struct file *file, int mask, int function,
xattr_value, xattr_len, opened);
if (action & IMA_AUDIT)
ima_audit_measurement(iint, pathname);
- kfree(pathbuf);
+
out_digsig:
if ((mask & MAY_WRITE) && (iint->flags & IMA_DIGSIG))
rc = -EACCES;
+ kfree(xattr_value);
+out_free:
+ kfree(pathbuf);
out:
mutex_unlock(&inode->i_mutex);
- kfree(xattr_value);
if ((rc && must_appraise) && (ima_appraise & IMA_APPRAISE_ENFORCE))
return -EACCES;
return 0;
@@ -288,7 +301,6 @@ int ima_bprm_check(struct linux_binprm *bprm)
*/
int ima_file_check(struct file *file, int mask, int opened)
{
- ima_rdwr_violation_check(file);
return process_measurement(file,
mask & (MAY_READ | MAY_WRITE | MAY_EXEC),
FILE_CHECK, opened);