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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f7e47677e3
Add a key/keyring change notification facility whereby notifications about
changes in key and keyring content and attributes can be received.
Firstly, an event queue needs to be created:
pipe2(fds, O_NOTIFICATION_PIPE);
ioctl(fds[1], IOC_WATCH_QUEUE_SET_SIZE, 256);
then a notification can be set up to report notifications via that queue:
struct watch_notification_filter filter = {
.nr_filters = 1,
.filters = {
[0] = {
.type = WATCH_TYPE_KEY_NOTIFY,
.subtype_filter[0] = UINT_MAX,
},
},
};
ioctl(fds[1], IOC_WATCH_QUEUE_SET_FILTER, &filter);
keyctl_watch_key(KEY_SPEC_SESSION_KEYRING, fds[1], 0x01);
After that, records will be placed into the queue when events occur in
which keys are changed in some way. Records are of the following format:
struct key_notification {
struct watch_notification watch;
__u32 key_id;
__u32 aux;
} *n;
Where:
n->watch.type will be WATCH_TYPE_KEY_NOTIFY.
n->watch.subtype will indicate the type of event, such as
NOTIFY_KEY_REVOKED.
n->watch.info & WATCH_INFO_LENGTH will indicate the length of the
record.
n->watch.info & WATCH_INFO_ID will be the second argument to
keyctl_watch_key(), shifted.
n->key will be the ID of the affected key.
n->aux will hold subtype-dependent information, such as the key
being linked into the keyring specified by n->key in the case of
NOTIFY_KEY_LINKED.
Note that it is permissible for event records to be of variable length -
or, at least, the length may be dependent on the subtype. Note also that
the queue can be shared between multiple notifications of various types.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
166 lines
4.0 KiB
C
166 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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#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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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 compat_keyctl_dh_compute(compat_ptr(arg2),
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compat_ptr(arg3),
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arg4, compat_ptr(arg5));
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case KEYCTL_RESTRICT_KEYRING:
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return keyctl_restrict_keyring(arg2, compat_ptr(arg3),
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compat_ptr(arg4));
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case KEYCTL_PKEY_QUERY:
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if (arg3 != 0)
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return -EINVAL;
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return keyctl_pkey_query(arg2,
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compat_ptr(arg4),
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compat_ptr(arg5));
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case KEYCTL_PKEY_ENCRYPT:
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case KEYCTL_PKEY_DECRYPT:
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case KEYCTL_PKEY_SIGN:
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return keyctl_pkey_e_d_s(option,
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compat_ptr(arg2), compat_ptr(arg3),
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compat_ptr(arg4), compat_ptr(arg5));
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case KEYCTL_PKEY_VERIFY:
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return keyctl_pkey_verify(compat_ptr(arg2), compat_ptr(arg3),
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compat_ptr(arg4), compat_ptr(arg5));
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case KEYCTL_MOVE:
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return keyctl_keyring_move(arg2, arg3, arg4, arg5);
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case KEYCTL_CAPABILITIES:
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return keyctl_capabilities(compat_ptr(arg2), arg3);
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case KEYCTL_WATCH_KEY:
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return keyctl_watch_key(arg2, arg3, arg4);
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default:
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return -EOPNOTSUPP;
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}
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}
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