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Diffstat (limited to 'security/keys/compat.c')
| -rw-r--r-- | security/keys/compat.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/security/keys/compat.c b/security/keys/compat.c new file mode 100644 index 000000000..e87c89c01 --- /dev/null +++ b/security/keys/compat.c @@ -0,0 +1,147 @@ +/* 32-bit compatibility syscall for 64-bit systems + * + * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#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. + */ +static 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; + struct iov_iter from; + long ret; + + if (!_payload_iov) + ioc = 0; + + ret = compat_import_iovec(WRITE, _payload_iov, ioc, + ARRAY_SIZE(iovstack), &iov, + &from); + if (ret < 0) + return ret; + + ret = keyctl_instantiate_key_common(id, &from, ringid); + kfree(iov); + return ret; +} + +/* + * 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 + * mode or doesn't guarantee that the top 32-bits of the argument registers on + * taking a 32-bit syscall are zero. If you can, you should call sys_keyctl() + * directly. + */ +COMPAT_SYSCALL_DEFINE5(keyctl, u32, option, + u32, arg2, u32, arg3, u32, arg4, u32, arg5) +{ + switch (option) { + case KEYCTL_GET_KEYRING_ID: + return keyctl_get_keyring_ID(arg2, arg3); + + case KEYCTL_JOIN_SESSION_KEYRING: + return keyctl_join_session_keyring(compat_ptr(arg2)); + + case KEYCTL_UPDATE: + return keyctl_update_key(arg2, compat_ptr(arg3), arg4); + + case KEYCTL_REVOKE: + return keyctl_revoke_key(arg2); + + case KEYCTL_DESCRIBE: + return keyctl_describe_key(arg2, compat_ptr(arg3), arg4); + + case KEYCTL_CLEAR: + return keyctl_keyring_clear(arg2); + + case KEYCTL_LINK: + return keyctl_keyring_link(arg2, arg3); + + case KEYCTL_UNLINK: + return keyctl_keyring_unlink(arg2, arg3); + + case KEYCTL_SEARCH: + return keyctl_keyring_search(arg2, compat_ptr(arg3), + compat_ptr(arg4), arg5); + + case KEYCTL_READ: + return keyctl_read_key(arg2, compat_ptr(arg3), arg4); + + case KEYCTL_CHOWN: + return keyctl_chown_key(arg2, arg3, arg4); + + case KEYCTL_SETPERM: + return keyctl_setperm_key(arg2, arg3); + + case KEYCTL_INSTANTIATE: + return keyctl_instantiate_key(arg2, compat_ptr(arg3), arg4, + arg5); + + case KEYCTL_NEGATE: + return keyctl_negate_key(arg2, arg3, arg4); + + case KEYCTL_SET_REQKEY_KEYRING: + return keyctl_set_reqkey_keyring(arg2); + + case KEYCTL_SET_TIMEOUT: + return keyctl_set_timeout(arg2, arg3); + + case KEYCTL_ASSUME_AUTHORITY: + return keyctl_assume_authority(arg2); + + case KEYCTL_GET_SECURITY: + return keyctl_get_security(arg2, compat_ptr(arg3), arg4); + + 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); + + case KEYCTL_INVALIDATE: + return keyctl_invalidate_key(arg2); + + case KEYCTL_GET_PERSISTENT: + return keyctl_get_persistent(arg2, arg3); + + case KEYCTL_DH_COMPUTE: + return compat_keyctl_dh_compute(compat_ptr(arg2), + compat_ptr(arg3), + arg4, compat_ptr(arg5)); + + case KEYCTL_RESTRICT_KEYRING: + return keyctl_restrict_keyring(arg2, compat_ptr(arg3), + compat_ptr(arg4)); + + default: + return -EOPNOTSUPP; + } +} |