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authorLinus Torvalds <torvalds@linux-foundation.org>2016-05-21 05:16:12 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-21 05:16:12 +0300
commitb99a9e8776ca837344c6b64d518483fc5d5eefb4 (patch)
tree66f7534e7bc008f21cb493a706d3d3a670aa12f5 /fs
parentbe1332c0994fbf016fa4ef0f0c4acda566fe6cb3 (diff)
parent48a77aa7e20557319205f9bd4cc02d4b67b5f761 (diff)
downloadlinux-b99a9e8776ca837344c6b64d518483fc5d5eefb4.tar.xz
Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French: "Two small cifs fixes, including one spnego upcall cifs security fix for stable" * 'for-next' of git://git.samba.org/sfrench/cifs-2.6: CIFS: Remove some obsolete comments cifs: Create dedicated keyring for spnego operations
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifs_spnego.c67
-rw-r--r--fs/cifs/cifsfs.c11
-rw-r--r--fs/cifs/cifsproto.h2
3 files changed, 72 insertions, 8 deletions
diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c
index 6908080e9b6d..b611fc2e8984 100644
--- a/fs/cifs/cifs_spnego.c
+++ b/fs/cifs/cifs_spnego.c
@@ -24,10 +24,13 @@
#include <linux/string.h>
#include <keys/user-type.h>
#include <linux/key-type.h>
+#include <linux/keyctl.h>
#include <linux/inet.h>
#include "cifsglob.h"
#include "cifs_spnego.h"
#include "cifs_debug.h"
+#include "cifsproto.h"
+static const struct cred *spnego_cred;
/* create a new cifs key */
static int
@@ -102,6 +105,7 @@ cifs_get_spnego_key(struct cifs_ses *sesInfo)
size_t desc_len;
struct key *spnego_key;
const char *hostname = server->hostname;
+ const struct cred *saved_cred;
/* length of fields (with semicolons): ver=0xyz ip4=ipaddress
host=hostname sec=mechanism uid=0xFF user=username */
@@ -163,7 +167,9 @@ cifs_get_spnego_key(struct cifs_ses *sesInfo)
sprintf(dp, ";pid=0x%x", current->pid);
cifs_dbg(FYI, "key description = %s\n", description);
+ saved_cred = override_creds(spnego_cred);
spnego_key = request_key(&cifs_spnego_key_type, description, "");
+ revert_creds(saved_cred);
#ifdef CONFIG_CIFS_DEBUG2
if (cifsFYI && !IS_ERR(spnego_key)) {
@@ -177,3 +183,64 @@ out:
kfree(description);
return spnego_key;
}
+
+int
+init_cifs_spnego(void)
+{
+ struct cred *cred;
+ struct key *keyring;
+ int ret;
+
+ cifs_dbg(FYI, "Registering the %s key type\n",
+ cifs_spnego_key_type.name);
+
+ /*
+ * Create an override credential set with special thread keyring for
+ * spnego upcalls.
+ */
+
+ cred = prepare_kernel_cred(NULL);
+ if (!cred)
+ return -ENOMEM;
+
+ keyring = keyring_alloc(".cifs_spnego",
+ GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) |
+ KEY_USR_VIEW | KEY_USR_READ,
+ KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
+ if (IS_ERR(keyring)) {
+ ret = PTR_ERR(keyring);
+ goto failed_put_cred;
+ }
+
+ ret = register_key_type(&cifs_spnego_key_type);
+ if (ret < 0)
+ goto failed_put_key;
+
+ /*
+ * 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;
+ spnego_cred = cred;
+
+ cifs_dbg(FYI, "cifs spnego keyring: %d\n", key_serial(keyring));
+ return 0;
+
+failed_put_key:
+ key_put(keyring);
+failed_put_cred:
+ put_cred(cred);
+ return ret;
+}
+
+void
+exit_cifs_spnego(void)
+{
+ key_revoke(spnego_cred->thread_keyring);
+ unregister_key_type(&cifs_spnego_key_type);
+ put_cred(spnego_cred);
+ cifs_dbg(FYI, "Unregistered %s key type\n", cifs_spnego_key_type.name);
+}
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 08fa36e5b2bc..5d8b7edf8a8f 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -890,7 +890,6 @@ const struct inode_operations cifs_dir_inode_ops = {
.rmdir = cifs_rmdir,
.rename2 = cifs_rename2,
.permission = cifs_permission,
-/* revalidate:cifs_revalidate, */
.setattr = cifs_setattr,
.symlink = cifs_symlink,
.mknod = cifs_mknod,
@@ -901,9 +900,8 @@ const struct inode_operations cifs_dir_inode_ops = {
};
const struct inode_operations cifs_file_inode_ops = {
-/* revalidate:cifs_revalidate, */
.setattr = cifs_setattr,
- .getattr = cifs_getattr, /* do we need this anymore? */
+ .getattr = cifs_getattr,
.permission = cifs_permission,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
@@ -915,9 +913,6 @@ const struct inode_operations cifs_symlink_inode_ops = {
.readlink = generic_readlink,
.get_link = cifs_get_link,
.permission = cifs_permission,
- /* BB add the following two eventually */
- /* revalidate: cifs_revalidate,
- setattr: cifs_notify_change, *//* BB do we need notify change */
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = cifs_listxattr,
@@ -1303,7 +1298,7 @@ init_cifs(void)
goto out_destroy_mids;
#ifdef CONFIG_CIFS_UPCALL
- rc = register_key_type(&cifs_spnego_key_type);
+ rc = init_cifs_spnego();
if (rc)
goto out_destroy_request_bufs;
#endif /* CONFIG_CIFS_UPCALL */
@@ -1326,7 +1321,7 @@ out_init_cifs_idmap:
out_register_key_type:
#endif
#ifdef CONFIG_CIFS_UPCALL
- unregister_key_type(&cifs_spnego_key_type);
+ exit_cifs_spnego();
out_destroy_request_bufs:
#endif
cifs_destroy_request_bufs();
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 0f9a6bc4ba43..1243bd326591 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -58,6 +58,8 @@ do { \
} while (0)
extern int init_cifs_idmap(void);
extern void exit_cifs_idmap(void);
+extern int init_cifs_spnego(void);
+extern void exit_cifs_spnego(void);
extern char *build_path_from_dentry(struct dentry *);
extern char *cifs_build_path_to_root(struct smb_vol *vol,
struct cifs_sb_info *cifs_sb,