[PATCH] Allow clients to set key perms in key_create_or_update()

[Arun Raghavan <arunsr@cse.iitk.ac.in>]

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Hello,
The key_create_or_update() function provided by the keyring code has a 
default set of permissions that are always applied to the key when 
created. This might not be desirable to all clients.

Here's a patch that adds a "perm" parameter to the function to address 
this, which can be set to KEY_PERM_UNDEF to revert to the current behaviour.

Cheers,
Arun

[please CC me on replies -- I'm not on the LKML)

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diff --git a/include/linux/key.h b/include/linux/key.h
index a70b8a8..5b09ad6 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -67,6 +67,8 @@ struct key;
 #define KEY_OTH_SETATTR	0x00000020
 #define KEY_OTH_ALL	0x0000003f
 
+#define KEY_PERM_UNDEF	0xffffffff
+
 struct seq_file;
 struct user_struct;
 struct signal_struct;
@@ -229,6 +231,7 @@ extern key_ref_t key_create_or_update(key_ref_t keyring,
 				      const char *description,
 				      const void *payload,
 				      size_t plen,
+				      key_perm_t perm,
 				      unsigned long flags);
 
 extern int key_update(key_ref_t key,
diff --git a/security/keys/key.c b/security/keys/key.c
index fdd5ca6..ca1d921 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -757,11 +757,11 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
 			       const char *description,
 			       const void *payload,
 			       size_t plen,
+			       key_perm_t perm,
 			       unsigned long flags)
 {
 	struct key_type *ktype;
 	struct key *keyring, *key = NULL;
-	key_perm_t perm;
 	key_ref_t key_ref;
 	int ret;
 
@@ -806,15 +806,17 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
 			goto found_matching_key;
 	}
 
-	/* decide on the permissions we want */
-	perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
-	perm |= KEY_USR_VIEW | KEY_USR_SEARCH | KEY_USR_LINK | KEY_USR_SETATTR;
+	/* if the client doesn't provide, decide on the permissions we want */
+	if (perm == KEY_PERM_UNDEF) {
+		perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
+		perm |= KEY_USR_VIEW | KEY_USR_SEARCH | KEY_USR_LINK | KEY_USR_SETATTR;
 
-	if (ktype->read)
-		perm |= KEY_POS_READ | KEY_USR_READ;
+		if (ktype->read)
+			perm |= KEY_POS_READ | KEY_USR_READ;
 
-	if (ktype == &key_type_keyring || ktype->update)
-		perm |= KEY_USR_WRITE;
+		if (ktype == &key_type_keyring || ktype->update)
+			perm |= KEY_USR_WRITE;
+	}
 
 	/* allocate a new key */
 	key = key_alloc(ktype, description, current->fsuid, current->fsgid,
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index d9ca15c..90ba663 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -102,7 +102,8 @@ asmlinkage long sys_add_key(const char __user *_type,
 	/* create or update the requested key and add it to the target
 	 * keyring */
 	key_ref = key_create_or_update(keyring_ref, type, description,
-				       payload, plen, KEY_ALLOC_IN_QUOTA);
+				       payload, plen, KEY_PERM_UNDEF,
+				       KEY_ALLOC_IN_QUOTA);
 	if (!IS_ERR(key_ref)) {
 		ret = key_ref_to_ptr(key_ref)->serial;
 		key_ref_put(key_ref);

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