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4693fc734d
The values computed during Diffie-Hellman key exchange are often used in combination with key derivation functions to create cryptographic keys. Add a placeholder for a later implementation to configure a key derivation function that will transform the Diffie-Hellman result returned by the KEYCTL_DH_COMPUTE command. [This patch was stripped down from a patch produced by Mat Martineau that had a bug in the compat code - so for the moment Stephan's patch simply requires that the placeholder argument must be NULL] Original-signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/* 32-bit compatibility syscall for 64-bit systems
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*
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* Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/syscalls.h>
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#include <linux/keyctl.h>
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#include <linux/compat.h>
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#include <linux/slab.h>
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#include "internal.h"
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/*
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* Instantiate a key with the specified compatibility multipart payload and
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* link the key into the destination keyring if one is given.
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*
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* The caller must have the appropriate instantiation permit set for this to
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* work (see keyctl_assume_authority). No other permissions are required.
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*
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* If successful, 0 will be returned.
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*/
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static long compat_keyctl_instantiate_key_iov(
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key_serial_t id,
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const struct compat_iovec __user *_payload_iov,
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unsigned ioc,
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key_serial_t ringid)
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{
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struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
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struct iov_iter from;
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long ret;
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if (!_payload_iov)
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ioc = 0;
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ret = compat_import_iovec(WRITE, _payload_iov, ioc,
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ARRAY_SIZE(iovstack), &iov,
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&from);
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if (ret < 0)
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return ret;
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ret = keyctl_instantiate_key_common(id, &from, ringid);
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kfree(iov);
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return ret;
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}
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/*
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* The key control system call, 32-bit compatibility version for 64-bit archs
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*
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* This should only be called if the 64-bit arch uses weird pointers in 32-bit
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* mode or doesn't guarantee that the top 32-bits of the argument registers on
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* taking a 32-bit syscall are zero. If you can, you should call sys_keyctl()
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* directly.
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*/
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COMPAT_SYSCALL_DEFINE5(keyctl, u32, option,
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u32, arg2, u32, arg3, u32, arg4, u32, arg5)
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{
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switch (option) {
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case KEYCTL_GET_KEYRING_ID:
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return keyctl_get_keyring_ID(arg2, arg3);
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case KEYCTL_JOIN_SESSION_KEYRING:
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return keyctl_join_session_keyring(compat_ptr(arg2));
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case KEYCTL_UPDATE:
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return keyctl_update_key(arg2, compat_ptr(arg3), arg4);
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case KEYCTL_REVOKE:
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return keyctl_revoke_key(arg2);
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case KEYCTL_DESCRIBE:
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return keyctl_describe_key(arg2, compat_ptr(arg3), arg4);
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case KEYCTL_CLEAR:
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return keyctl_keyring_clear(arg2);
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case KEYCTL_LINK:
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return keyctl_keyring_link(arg2, arg3);
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case KEYCTL_UNLINK:
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return keyctl_keyring_unlink(arg2, arg3);
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case KEYCTL_SEARCH:
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return keyctl_keyring_search(arg2, compat_ptr(arg3),
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compat_ptr(arg4), arg5);
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case KEYCTL_READ:
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return keyctl_read_key(arg2, compat_ptr(arg3), arg4);
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case KEYCTL_CHOWN:
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return keyctl_chown_key(arg2, arg3, arg4);
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case KEYCTL_SETPERM:
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return keyctl_setperm_key(arg2, arg3);
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case KEYCTL_INSTANTIATE:
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return keyctl_instantiate_key(arg2, compat_ptr(arg3), arg4,
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arg5);
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case KEYCTL_NEGATE:
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return keyctl_negate_key(arg2, arg3, arg4);
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case KEYCTL_SET_REQKEY_KEYRING:
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return keyctl_set_reqkey_keyring(arg2);
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case KEYCTL_SET_TIMEOUT:
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return keyctl_set_timeout(arg2, arg3);
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case KEYCTL_ASSUME_AUTHORITY:
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return keyctl_assume_authority(arg2);
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case KEYCTL_GET_SECURITY:
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return keyctl_get_security(arg2, compat_ptr(arg3), arg4);
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case KEYCTL_SESSION_TO_PARENT:
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return keyctl_session_to_parent();
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case KEYCTL_REJECT:
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return keyctl_reject_key(arg2, arg3, arg4, arg5);
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case KEYCTL_INSTANTIATE_IOV:
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return compat_keyctl_instantiate_key_iov(
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arg2, compat_ptr(arg3), arg4, arg5);
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case KEYCTL_INVALIDATE:
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return keyctl_invalidate_key(arg2);
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case KEYCTL_GET_PERSISTENT:
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return keyctl_get_persistent(arg2, arg3);
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case KEYCTL_DH_COMPUTE:
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return keyctl_dh_compute(compat_ptr(arg2), compat_ptr(arg3),
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arg4, compat_ptr(arg5));
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default:
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return -EOPNOTSUPP;
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}
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}
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