1 files changed, 18 insertions, 4 deletions

diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 5f2e3326337..18369d497eb 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -13,6 +13,8 @@
 #include <linux/mount.h>
 #include <linux/mnt_namespace.h>
 #include <linux/fs_struct.h>
+#include <linux/hash.h>
+
 #include "common.h"
 #include "realpath.h"
 
@@ -108,6 +110,15 @@ int tomoyo_realpath_from_path2(struct path *path, char *newname,
 		spin_unlock(&dcache_lock);
 		path_put(&root);
 		path_put(&ns_root);
+		/* Prepend "/proc" prefix if using internal proc vfs mount. */
+		if (!IS_ERR(sp) && (path->mnt->mnt_parent == path->mnt) &&
+		    (strcmp(path->mnt->mnt_sb->s_type->name, "proc") == 0)) {
+			sp -= 5;
+			if (sp >= newname)
+				memcpy(sp, "/proc", 5);
+			else
+				sp = ERR_PTR(-ENOMEM);
+		}
 	}
 	if (IS_ERR(sp))
 		error = PTR_ERR(sp);
@@ -263,7 +274,8 @@ static unsigned int tomoyo_quota_for_savename;
  * table. Frequency of appending strings is very low. So we don't need
  * large (e.g. 64k) hash size. 256 will be sufficient.
  */
-#define TOMOYO_MAX_HASH 256
+#define TOMOYO_HASH_BITS  8
+#define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)
 
 /*
  * tomoyo_name_entry is a structure which is used for linking
@@ -315,6 +327,7 @@ const struct tomoyo_path_info *tomoyo_save_name(const char *name)
 	struct tomoyo_free_memory_block_list *fmb;
 	int len;
 	char *cp;
+	struct list_head *head;
 
 	if (!name)
 		return NULL;
@@ -325,9 +338,10 @@ const struct tomoyo_path_info *tomoyo_save_name(const char *name)
 		return NULL;
 	}
 	hash = full_name_hash((const unsigned char *) name, len - 1);
+	head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
+
 	mutex_lock(&lock);
-	list_for_each_entry(ptr, &tomoyo_name_list[hash % TOMOYO_MAX_HASH],
-			     list) {
+	list_for_each_entry(ptr, head, list) {
 		if (hash == ptr->entry.hash && !strcmp(name, ptr->entry.name))
 			goto out;
 	}
@@ -365,7 +379,7 @@ const struct tomoyo_path_info *tomoyo_save_name(const char *name)
 	tomoyo_fill_path_info(&ptr->entry);
 	fmb->ptr += len;
 	fmb->len -= len;
-	list_add_tail(&ptr->list, &tomoyo_name_list[hash % TOMOYO_MAX_HASH]);
+	list_add_tail(&ptr->list, head);
 	if (fmb->len == 0) {
 		list_del(&fmb->list);
 		kfree(fmb);