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-rw-r--r--security/integrity/ima/ima_main.c22
1 files changed, 16 insertions, 6 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 939f53d02627..82c9d62bcb11 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -613,11 +613,8 @@ void ima_post_path_mknod(struct dentry *dentry)
int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
bool contents)
{
- /* Reject all partial reads during appraisal. */
- if (!contents) {
- if (ima_appraise & IMA_APPRAISE_ENFORCE)
- return -EACCES;
- }
+ enum ima_hooks func;
+ u32 secid;
/*
* Do devices using pre-allocated memory run the risk of the
@@ -626,7 +623,20 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
* buffers? It may be desirable to include the buffer address
* in this API and walk all the dma_map_single() mappings to check.
*/
- return 0;
+
+ /*
+ * There will be a call made to ima_post_read_file() with
+ * a filled buffer, so we don't need to perform an extra
+ * read early here.
+ */
+ if (contents)
+ return 0;
+
+ /* Read entire file for all partial reads. */
+ func = read_idmap[read_id] ?: FILE_CHECK;
+ security_task_getsecid(current, &secid);
+ return process_measurement(file, current_cred(), secid, NULL,
+ 0, MAY_READ, func);
}
const int read_idmap[READING_MAX_ID] = {