diff options
Diffstat (limited to 'freed-ora/current/master/linux-3.1-keys-remove-special-keyring.patch')
| -rw-r--r-- | freed-ora/current/master/linux-3.1-keys-remove-special-keyring.patch | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/freed-ora/current/master/linux-3.1-keys-remove-special-keyring.patch b/freed-ora/current/master/linux-3.1-keys-remove-special-keyring.patch new file mode 100644 index 000000000..4e7f1395b --- /dev/null +++ b/freed-ora/current/master/linux-3.1-keys-remove-special-keyring.patch @@ -0,0 +1,110 @@ +diff -up linux-3.1.x86_64/Documentation/networking/dns_resolver.txt.orig linux-3.1.x86_64/Documentation/networking/dns_resolver.txt +--- linux-3.1.x86_64/Documentation/networking/dns_resolver.txt.orig 2011-10-24 03:10:05.000000000 -0400 ++++ linux-3.1.x86_64/Documentation/networking/dns_resolver.txt 2011-12-13 15:09:35.705766078 -0500 +@@ -102,6 +102,10 @@ implemented in the module can be called + If _expiry is non-NULL, the expiry time (TTL) of the result will be + returned also. + ++The kernel maintains an internal keyring in which it caches looked up keys. ++This can be cleared by any process that has the CAP_SYS_ADMIN capability by ++the use of KEYCTL_KEYRING_CLEAR on the keyring ID. ++ + + =============================== + READING DNS KEYS FROM USERSPACE +diff -up linux-3.1.x86_64/Documentation/security/keys.txt.orig linux-3.1.x86_64/Documentation/security/keys.txt +--- linux-3.1.x86_64/Documentation/security/keys.txt.orig 2011-10-24 03:10:05.000000000 -0400 ++++ linux-3.1.x86_64/Documentation/security/keys.txt 2011-12-13 15:09:35.706766099 -0500 +@@ -554,6 +554,10 @@ The keyctl syscall functions are: + process must have write permission on the keyring, and it must be a + keyring (or else error ENOTDIR will result). + ++ This function can also be used to clear special kernel keyrings if they ++ are appropriately marked if the user has CAP_SYS_ADMIN capability. The ++ DNS resolver cache keyring is an example of this. ++ + + (*) Link a key into a keyring: + +diff -up linux-3.1.x86_64/fs/cifs/cifsacl.c.orig linux-3.1.x86_64/fs/cifs/cifsacl.c +--- linux-3.1.x86_64/fs/cifs/cifsacl.c.orig 2011-12-13 12:54:12.221145867 -0500 ++++ linux-3.1.x86_64/fs/cifs/cifsacl.c 2011-12-13 15:09:35.707766122 -0500 +@@ -556,6 +556,7 @@ init_cifs_idmap(void) + + /* instruct request_key() to use this special keyring as a cache for + * the results it looks up */ ++ set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); + cred->thread_keyring = keyring; + cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; + root_cred = cred; +diff -up linux-3.1.x86_64/fs/nfs/idmap.c.orig linux-3.1.x86_64/fs/nfs/idmap.c +--- linux-3.1.x86_64/fs/nfs/idmap.c.orig 2011-12-13 12:54:14.657203507 -0500 ++++ linux-3.1.x86_64/fs/nfs/idmap.c 2011-12-13 15:10:14.731681691 -0500 +@@ -115,6 +115,7 @@ int nfs_idmap_init(void) + if (ret < 0) + goto failed_put_key; + ++ set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); + cred->thread_keyring = keyring; + cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; + id_resolver_cache = cred; +@@ -185,7 +186,7 @@ static ssize_t nfs_idmap_request_key(con + } + + rcu_read_lock(); +- rkey->perm |= KEY_USR_VIEW; ++ rkey->perm |= KEY_USR_VIEW|KEY_USR_WRITE; + + ret = key_validate(rkey); + if (ret < 0) +diff -up linux-3.1.x86_64/include/linux/key.h.orig linux-3.1.x86_64/include/linux/key.h +--- linux-3.1.x86_64/include/linux/key.h.orig 2011-10-24 03:10:05.000000000 -0400 ++++ linux-3.1.x86_64/include/linux/key.h 2011-12-13 15:09:35.748767078 -0500 +@@ -155,6 +155,7 @@ struct key { + #define KEY_FLAG_IN_QUOTA 3 /* set if key consumes quota */ + #define KEY_FLAG_USER_CONSTRUCT 4 /* set if key is being constructed in userspace */ + #define KEY_FLAG_NEGATIVE 5 /* set if key is negative */ ++#define KEY_FLAG_ROOT_CAN_CLEAR 6 /* set if key can be cleared by root without permission */ + + /* the description string + * - this is used to match a key against search criteria +diff -up linux-3.1.x86_64/net/dns_resolver/dns_key.c.orig linux-3.1.x86_64/net/dns_resolver/dns_key.c +--- linux-3.1.x86_64/net/dns_resolver/dns_key.c.orig 2011-10-24 03:10:05.000000000 -0400 ++++ linux-3.1.x86_64/net/dns_resolver/dns_key.c 2011-12-13 15:09:35.748767078 -0500 +@@ -281,6 +281,7 @@ static int __init init_dns_resolver(void + + /* instruct request_key() to use this special keyring as a cache for + * the results it looks up */ ++ set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); + cred->thread_keyring = keyring; + cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; + dns_resolver_cache = cred; +diff -up linux-3.1.x86_64/security/keys/keyctl.c.orig linux-3.1.x86_64/security/keys/keyctl.c +--- linux-3.1.x86_64/security/keys/keyctl.c.orig 2011-12-13 12:54:30.322571289 -0500 ++++ linux-3.1.x86_64/security/keys/keyctl.c 2011-12-13 15:09:35.756767271 -0500 +@@ -388,11 +388,24 @@ long keyctl_keyring_clear(key_serial_t r + keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); + if (IS_ERR(keyring_ref)) { + ret = PTR_ERR(keyring_ref); ++ ++ /* Root is permitted to invalidate certain special keyrings */ ++ if (capable(CAP_SYS_ADMIN)) { ++ keyring_ref = lookup_user_key(ringid, 0, 0); ++ if (IS_ERR(keyring_ref)) ++ goto error; ++ if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, ++ &key_ref_to_ptr(keyring_ref)->flags)) ++ goto clear; ++ goto error_put; ++ } ++ + goto error; + } + ++clear: + ret = keyring_clear(key_ref_to_ptr(keyring_ref)); +- ++error_put: + key_ref_put(keyring_ref); + error: + return ret; |
