Update Linux to v5.4.148
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz
Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/security/integrity/evm/evm_secfs.c b/security/integrity/evm/evm_secfs.c
index c11c1f7..d7f12ed 100644
--- a/security/integrity/evm/evm_secfs.c
+++ b/security/integrity/evm/evm_secfs.c
@@ -68,12 +68,13 @@
static ssize_t evm_write_key(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- int i, ret;
+ unsigned int i;
+ int ret;
if (!capable(CAP_SYS_ADMIN) || (evm_initialized & EVM_SETUP_COMPLETE))
return -EPERM;
- ret = kstrtoint_from_user(buf, count, 0, &i);
+ ret = kstrtouint_from_user(buf, count, 0, &i);
if (ret)
return ret;
@@ -82,12 +83,12 @@
if (!i || (i & ~EVM_INIT_MASK) != 0)
return -EINVAL;
- /* Don't allow a request to freshly enable metadata writes if
- * keys are loaded.
+ /*
+ * Don't allow a request to enable metadata writes if
+ * an HMAC key is loaded.
*/
if ((i & EVM_ALLOW_METADATA_WRITES) &&
- ((evm_initialized & EVM_KEY_MASK) != 0) &&
- !(evm_initialized & EVM_ALLOW_METADATA_WRITES))
+ (evm_initialized & EVM_INIT_HMAC) != 0)
return -EPERM;
if (i & EVM_INIT_HMAC) {
@@ -234,7 +235,14 @@
goto out;
}
- /* Guard against races in evm_read_xattrs */
+ /*
+ * xattr_list_mutex guards against races in evm_read_xattrs().
+ * Entries are only added to the evm_config_xattrnames list
+ * and never deleted. Therefore, the list is traversed
+ * using list_for_each_entry_lockless() without holding
+ * the mutex in evm_calc_hmac_or_hash(), evm_find_protected_xattrs()
+ * and evm_protected_xattr().
+ */
mutex_lock(&xattr_list_mutex);
list_for_each_entry(tmp, &evm_config_xattrnames, list) {
if (strcmp(xattr->name, tmp->name) == 0) {