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-rw-r--r--security/keys/compat.c50
-rw-r--r--security/keys/encrypted.c3
-rw-r--r--security/keys/internal.h8
-rw-r--r--security/keys/key.c27
-rw-r--r--security/keys/keyctl.c143
-rw-r--r--security/keys/keyring.c4
-rw-r--r--security/keys/request_key.c2
-rw-r--r--security/keys/trusted.c3
-rw-r--r--security/keys/user_defined.c3
9 files changed, 217 insertions, 26 deletions
diff --git a/security/keys/compat.c b/security/keys/compat.c
index 07a5f35e3970..338b510e9027 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -12,9 +12,52 @@
#include <linux/syscalls.h>
#include <linux/keyctl.h>
#include <linux/compat.h>
+#include <linux/slab.h>
#include "internal.h"
/*
+ * Instantiate a key with the specified compatibility multipart payload and
+ * link the key into the destination keyring if one is given.
+ *
+ * The caller must have the appropriate instantiation permit set for this to
+ * work (see keyctl_assume_authority). No other permissions are required.
+ *
+ * If successful, 0 will be returned.
+ */
+long compat_keyctl_instantiate_key_iov(
+ key_serial_t id,
+ const struct compat_iovec __user *_payload_iov,
+ unsigned ioc,
+ key_serial_t ringid)
+{
+ struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+ long ret;
+
+ if (_payload_iov == 0 || ioc == 0)
+ goto no_payload;
+
+ ret = compat_rw_copy_check_uvector(WRITE, _payload_iov, ioc,
+ ARRAY_SIZE(iovstack),
+ iovstack, &iov);
+ if (ret < 0)
+ return ret;
+ if (ret == 0)
+ goto no_payload_free;
+
+ ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid);
+
+ if (iov != iovstack)
+ kfree(iov);
+ return ret;
+
+no_payload_free:
+ if (iov != iovstack)
+ kfree(iov);
+no_payload:
+ return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid);
+}
+
+/*
* The key control system call, 32-bit compatibility version for 64-bit archs
*
* This should only be called if the 64-bit arch uses weird pointers in 32-bit
@@ -85,6 +128,13 @@ asmlinkage long compat_sys_keyctl(u32 option,
case KEYCTL_SESSION_TO_PARENT:
return keyctl_session_to_parent();
+ case KEYCTL_REJECT:
+ return keyctl_reject_key(arg2, arg3, arg4, arg5);
+
+ case KEYCTL_INSTANTIATE_IOV:
+ return compat_keyctl_instantiate_key_iov(
+ arg2, compat_ptr(arg3), arg4, arg5);
+
default:
return -EOPNOTSUPP;
}
diff --git a/security/keys/encrypted.c b/security/keys/encrypted.c
index 9e7e4ce3fae8..69907a58a683 100644
--- a/security/keys/encrypted.c
+++ b/security/keys/encrypted.c
@@ -765,8 +765,7 @@ static long encrypted_read(const struct key *key, char __user *buffer,
size_t asciiblob_len;
int ret;
- epayload = rcu_dereference_protected(key->payload.data,
- rwsem_is_locked(&((struct key *)key)->sem));
+ epayload = rcu_dereference_key(key);
/* returns the hex encoded iv, encrypted-data, and hmac as ascii */
asciiblob_len = epayload->datablob_len + ivsize + 1
diff --git a/security/keys/internal.h b/security/keys/internal.h
index a52aa7c88b41..07a025f81902 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -214,6 +214,14 @@ extern long keyctl_assume_authority(key_serial_t);
extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
size_t buflen);
extern long keyctl_session_to_parent(void);
+extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
+extern long keyctl_instantiate_key_iov(key_serial_t,
+ const struct iovec __user *,
+ unsigned, key_serial_t);
+
+extern long keyctl_instantiate_key_common(key_serial_t,
+ const struct iovec __user *,
+ unsigned, size_t, key_serial_t);
/*
* Debugging key validation
diff --git a/security/keys/key.c b/security/keys/key.c
index 1c2d43dc5107..f7f9d93f08d9 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -249,6 +249,14 @@ struct key *key_alloc(struct key_type *type, const char *desc,
if (!desc || !*desc)
goto error;
+ if (type->vet_description) {
+ ret = type->vet_description(desc);
+ if (ret < 0) {
+ key = ERR_PTR(ret);
+ goto error;
+ }
+ }
+
desclen = strlen(desc) + 1;
quotalen = desclen + type->def_datalen;
@@ -503,26 +511,29 @@ int key_instantiate_and_link(struct key *key,
EXPORT_SYMBOL(key_instantiate_and_link);
/**
- * key_negate_and_link - Negatively instantiate a key and link it into the keyring.
+ * key_reject_and_link - Negatively instantiate a key and link it into the keyring.
* @key: The key to instantiate.
* @timeout: The timeout on the negative key.
+ * @error: The error to return when the key is hit.
* @keyring: Keyring to create a link in on success (or NULL).
* @authkey: The authorisation token permitting instantiation.
*
* Negatively instantiate a key that's in the uninstantiated state and, if
- * successful, set its timeout and link it in to the destination keyring if one
- * is supplied. The key and any links to the key will be automatically garbage
- * collected after the timeout expires.
+ * successful, set its timeout and stored error and link it in to the
+ * destination keyring if one is supplied. The key and any links to the key
+ * will be automatically garbage collected after the timeout expires.
*
* Negative keys are used to rate limit repeated request_key() calls by causing
- * them to return -ENOKEY until the negative key expires.
+ * them to return the stored error code (typically ENOKEY) until the negative
+ * key expires.
*
* If successful, 0 is returned, the authorisation token is revoked and anyone
* waiting for the key is woken up. If the key was already instantiated,
* -EBUSY will be returned.
*/
-int key_negate_and_link(struct key *key,
+int key_reject_and_link(struct key *key,
unsigned timeout,
+ unsigned error,
struct key *keyring,
struct key *authkey)
{
@@ -548,6 +559,7 @@ int key_negate_and_link(struct key *key,
atomic_inc(&key->user->nikeys);
set_bit(KEY_FLAG_NEGATIVE, &key->flags);
set_bit(KEY_FLAG_INSTANTIATED, &key->flags);
+ key->type_data.reject_error = -error;
now = current_kernel_time();
key->expiry = now.tv_sec + timeout;
key_schedule_gc(key->expiry + key_gc_delay);
@@ -577,8 +589,7 @@ int key_negate_and_link(struct key *key,
return ret == 0 ? link_ret : ret;
}
-
-EXPORT_SYMBOL(key_negate_and_link);
+EXPORT_SYMBOL(key_reject_and_link);
/*
* Garbage collect keys in process context so that we don't have to disable
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 31a0fd8189f1..427fddcaeb19 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -913,6 +913,21 @@ static int keyctl_change_reqkey_auth(struct key *key)
}
/*
+ * Copy the iovec data from userspace
+ */
+static long copy_from_user_iovec(void *buffer, const struct iovec *iov,
+ unsigned ioc)
+{
+ for (; ioc > 0; ioc--) {
+ if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0)
+ return -EFAULT;
+ buffer += iov->iov_len;
+ iov++;
+ }
+ return 0;
+}
+
+/*
* Instantiate a key with the specified payload and link the key into the
* destination keyring if one is given.
*
@@ -921,10 +936,11 @@ static int keyctl_change_reqkey_auth(struct key *key)
*
* If successful, 0 will be returned.
*/
-long keyctl_instantiate_key(key_serial_t id,
- const void __user *_payload,
- size_t plen,
- key_serial_t ringid)
+long keyctl_instantiate_key_common(key_serial_t id,
+ const struct iovec *payload_iov,
+ unsigned ioc,
+ size_t plen,
+ key_serial_t ringid)
{
const struct cred *cred = current_cred();
struct request_key_auth *rka;
@@ -953,7 +969,7 @@ long keyctl_instantiate_key(key_serial_t id,
/* pull the payload in if one was supplied */
payload = NULL;
- if (_payload) {
+ if (payload_iov) {
ret = -ENOMEM;
payload = kmalloc(plen, GFP_KERNEL);
if (!payload) {
@@ -965,8 +981,8 @@ long keyctl_instantiate_key(key_serial_t id,
goto error;
}
- ret = -EFAULT;
- if (copy_from_user(payload, _payload, plen) != 0)
+ ret = copy_from_user_iovec(payload, payload_iov, ioc);
+ if (ret < 0)
goto error2;
}
@@ -997,6 +1013,72 @@ error:
}
/*
+ * Instantiate a key with the specified payload and link the key into the
+ * destination keyring if one is given.
+ *
+ * The caller must have the appropriate instantiation permit set for this to
+ * work (see keyctl_assume_authority). No other permissions are required.
+ *
+ * If successful, 0 will be returned.
+ */
+long keyctl_instantiate_key(key_serial_t id,
+ const void __user *_payload,
+ size_t plen,
+ key_serial_t ringid)
+{
+ if (_payload && plen) {
+ struct iovec iov[1] = {
+ [0].iov_base = (void __user *)_payload,
+ [0].iov_len = plen
+ };
+
+ return keyctl_instantiate_key_common(id, iov, 1, plen, ringid);
+ }
+
+ return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid);
+}
+
+/*
+ * Instantiate a key with the specified multipart payload and link the key into
+ * the destination keyring if one is given.
+ *
+ * The caller must have the appropriate instantiation permit set for this to
+ * work (see keyctl_assume_authority). No other permissions are required.
+ *
+ * If successful, 0 will be returned.
+ */
+long keyctl_instantiate_key_iov(key_serial_t id,
+ const struct iovec __user *_payload_iov,
+ unsigned ioc,
+ key_serial_t ringid)
+{
+ struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+ long ret;
+
+ if (_payload_iov == 0 || ioc == 0)
+ goto no_payload;
+
+ ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc,
+ ARRAY_SIZE(iovstack), iovstack, &iov);
+ if (ret < 0)
+ return ret;
+ if (ret == 0)
+ goto no_payload_free;
+
+ ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid);
+
+ if (iov != iovstack)
+ kfree(iov);
+ return ret;
+
+no_payload_free:
+ if (iov != iovstack)
+ kfree(iov);
+no_payload:
+ return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid);
+}
+
+/*
* Negatively instantiate the key with the given timeout (in seconds) and link
* the key into the destination keyring if one is given.
*
@@ -1013,12 +1095,42 @@ error:
*/
long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
{
+ return keyctl_reject_key(id, timeout, ENOKEY, ringid);
+}
+
+/*
+ * Negatively instantiate the key with the given timeout (in seconds) and error
+ * code and link the key into the destination keyring if one is given.
+ *
+ * The caller must have the appropriate instantiation permit set for this to
+ * work (see keyctl_assume_authority). No other permissions are required.
+ *
+ * The key and any links to the key will be automatically garbage collected
+ * after the timeout expires.
+ *
+ * Negative keys are used to rate limit repeated request_key() calls by causing
+ * them to return the specified error code until the negative key expires.
+ *
+ * If successful, 0 will be returned.
+ */
+long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error,
+ key_serial_t ringid)
+{
const struct cred *cred = current_cred();
struct request_key_auth *rka;
struct key *instkey, *dest_keyring;
long ret;
- kenter("%d,%u,%d", id, timeout, ringid);
+ kenter("%d,%u,%u,%d", id, timeout, error, ringid);
+
+ /* must be a valid error code and mustn't be a kernel special */
+ if (error <= 0 ||
+ error >= MAX_ERRNO ||
+ error == ERESTARTSYS ||
+ error == ERESTARTNOINTR ||
+ error == ERESTARTNOHAND ||
+ error == ERESTART_RESTARTBLOCK)
+ return -EINVAL;
/* the appropriate instantiation authorisation key must have been
* assumed before calling this */
@@ -1038,7 +1150,7 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
goto error;
/* instantiate the key and link it into a keyring */
- ret = key_negate_and_link(rka->target_key, timeout,
+ ret = key_reject_and_link(rka->target_key, timeout, error,
dest_keyring, instkey);
key_put(dest_keyring);
@@ -1492,6 +1604,19 @@ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3,
case KEYCTL_SESSION_TO_PARENT:
return keyctl_session_to_parent();
+ case KEYCTL_REJECT:
+ return keyctl_reject_key((key_serial_t) arg2,
+ (unsigned) arg3,
+ (unsigned) arg4,
+ (key_serial_t) arg5);
+
+ case KEYCTL_INSTANTIATE_IOV:
+ return keyctl_instantiate_key_iov(
+ (key_serial_t) arg2,
+ (const struct iovec __user *) arg3,
+ (unsigned) arg4,
+ (key_serial_t) arg5);
+
default:
return -EOPNOTSUPP;
}
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 5620f084dede..cdd2f3f88c88 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -352,7 +352,7 @@ key_ref_t keyring_search_aux(key_ref_t keyring_ref,
goto error_2;
if (key->expiry && now.tv_sec >= key->expiry)
goto error_2;
- key_ref = ERR_PTR(-ENOKEY);
+ key_ref = ERR_PTR(key->type_data.reject_error);
if (kflags & (1 << KEY_FLAG_NEGATIVE))
goto error_2;
goto found;
@@ -401,7 +401,7 @@ descend:
/* we set a different error code if we pass a negative key */
if (kflags & (1 << KEY_FLAG_NEGATIVE)) {
- err = -ENOKEY;
+ err = key->type_data.reject_error;
continue;
}
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index a3dc0d460def..df3c0417ee40 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -585,7 +585,7 @@ int wait_for_key_construction(struct key *key, bool intr)
if (ret < 0)
return ret;
if (test_bit(KEY_FLAG_NEGATIVE, &key->flags))
- return -ENOKEY;
+ return key->type_data.reject_error;
return key_validate(key);
}
EXPORT_SYMBOL(wait_for_key_construction);
diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index 83fc92e297cd..c99b9368368c 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -1076,8 +1076,7 @@ static long trusted_read(const struct key *key, char __user *buffer,
char *bufp;
int i;
- p = rcu_dereference_protected(key->payload.data,
- rwsem_is_locked(&((struct key *)key)->sem));
+ p = rcu_dereference_key(key);
if (!p)
return -EINVAL;
if (!buffer || buflen <= 0)
diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index 02807fb16340..c6ca8662a468 100644
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -184,8 +184,7 @@ long user_read(const struct key *key, char __user *buffer, size_t buflen)
struct user_key_payload *upayload;
long ret;
- upayload = rcu_dereference_protected(
- key->payload.data, rwsem_is_locked(&((struct key *)key)->sem));
+ upayload = rcu_dereference_key(key);
ret = upayload->datalen;
/* we can return the data as is */