Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* AFS security handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2007, 2017 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/hashtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <keys/rxrpc-type.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) static DEFINE_HASHTABLE(afs_permits_cache, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) static DEFINE_SPINLOCK(afs_permits_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * get a key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) struct key *afs_request_key(struct afs_cell *cell)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct key *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	_enter("{%x}", key_serial(cell->anonymous_key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	_debug("key %s", cell->anonymous_key->description);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	key = request_key_net(&key_type_rxrpc, cell->anonymous_key->description,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 			      cell->net->net, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (IS_ERR(key)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		if (PTR_ERR(key) != -ENOKEY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 			_leave(" = %ld", PTR_ERR(key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 			return key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		/* act as anonymous user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		_leave(" = {%x} [anon]", key_serial(cell->anonymous_key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		return key_get(cell->anonymous_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		/* act as authorised user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		_leave(" = {%x} [auth]", key_serial(key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		return key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * Get a key when pathwalk is in rcuwalk mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) struct key *afs_request_key_rcu(struct afs_cell *cell)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	struct key *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	_enter("{%x}", key_serial(cell->anonymous_key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	_debug("key %s", cell->anonymous_key->description);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	key = request_key_net_rcu(&key_type_rxrpc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 				  cell->anonymous_key->description,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 				  cell->net->net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	if (IS_ERR(key)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		if (PTR_ERR(key) != -ENOKEY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			_leave(" = %ld", PTR_ERR(key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			return key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		/* act as anonymous user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		_leave(" = {%x} [anon]", key_serial(cell->anonymous_key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return key_get(cell->anonymous_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		/* act as authorised user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		_leave(" = {%x} [auth]", key_serial(key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		return key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * Dispose of a list of permits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) static void afs_permits_rcu(struct rcu_head *rcu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	struct afs_permits *permits =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		container_of(rcu, struct afs_permits, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	for (i = 0; i < permits->nr_permits; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		key_put(permits->permits[i].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	kfree(permits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  * Discard a permission cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) void afs_put_permits(struct afs_permits *permits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if (permits && refcount_dec_and_test(&permits->usage)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		spin_lock(&afs_permits_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		hash_del_rcu(&permits->hash_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		spin_unlock(&afs_permits_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		call_rcu(&permits->rcu, afs_permits_rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  * Clear a permit cache on callback break.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) void afs_clear_permits(struct afs_vnode *vnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	struct afs_permits *permits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	spin_lock(&vnode->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	permits = rcu_dereference_protected(vnode->permit_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 					    lockdep_is_held(&vnode->lock));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	RCU_INIT_POINTER(vnode->permit_cache, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	spin_unlock(&vnode->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	afs_put_permits(permits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  * Hash a list of permits.  Use simple addition to make it easy to add an extra
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  * one at an as-yet indeterminate position in the list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static void afs_hash_permits(struct afs_permits *permits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	unsigned long h = permits->nr_permits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	for (i = 0; i < permits->nr_permits; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		h += (unsigned long)permits->permits[i].key / sizeof(void *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		h += permits->permits[i].access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	permits->h = h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * Cache the CallerAccess result obtained from doing a fileserver operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * that returned a vnode status for a particular key.  If a callback break
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * occurs whilst the operation was in progress then we have to ditch the cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  * as the ACL *may* have changed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) void afs_cache_permit(struct afs_vnode *vnode, struct key *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		      unsigned int cb_break, struct afs_status_cb *scb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	struct afs_permits *permits, *xpermits, *replacement, *zap, *new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	afs_access_t caller_access = scb->status.caller_access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	size_t size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	bool changed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	_enter("{%llx:%llu},%x,%x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	       vnode->fid.vid, vnode->fid.vnode, key_serial(key), caller_access);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	/* Check for the common case first: We got back the same access as last
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	 * time we tried and already have it recorded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	permits = rcu_dereference(vnode->permit_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (permits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		if (!permits->invalidated) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			for (i = 0; i < permits->nr_permits; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 				if (permits->permits[i].key < key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 					continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 				if (permits->permits[i].key > key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 				if (permits->permits[i].access != caller_access) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 					changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 				if (afs_cb_is_broken(cb_break, vnode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 					changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 				/* The cache is still good. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 				rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 				return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		changed |= permits->invalidated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		size = permits->nr_permits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		/* If this set of permits is now wrong, clear the permits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		 * pointer so that no one tries to use the stale information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		if (changed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			spin_lock(&vnode->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			if (permits != rcu_access_pointer(vnode->permit_cache))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 				goto someone_else_changed_it_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			RCU_INIT_POINTER(vnode->permit_cache, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			spin_unlock(&vnode->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			afs_put_permits(permits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			permits = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (afs_cb_is_broken(cb_break, vnode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		goto someone_else_changed_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	/* We need a ref on any permits list we want to copy as we'll have to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 * drop the lock to do memory allocation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (permits && !refcount_inc_not_zero(&permits->usage))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		goto someone_else_changed_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	/* Speculatively create a new list with the revised permission set.  We
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	 * discard this if we find an extant match already in the hash, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	 * it's easier to compare with memcmp this way.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	 * We fill in the key pointers at this time, but we don't get the refs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	 * yet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	size++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	new = kzalloc(sizeof(struct afs_permits) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		      sizeof(struct afs_permit) * size, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	refcount_set(&new->usage, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	new->nr_permits = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	i = j = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (permits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		for (i = 0; i < permits->nr_permits; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			if (j == i && permits->permits[i].key > key) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 				new->permits[j].key = key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 				new->permits[j].access = caller_access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 				j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			new->permits[j].key = permits->permits[i].key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			new->permits[j].access = permits->permits[i].access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (j == i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		new->permits[j].key = key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		new->permits[j].access = caller_access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	afs_hash_permits(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	/* Now see if the permit list we want is actually already available */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	spin_lock(&afs_permits_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	hash_for_each_possible(afs_permits_cache, xpermits, hash_node, new->h) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		if (xpermits->h != new->h ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		    xpermits->invalidated ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		    xpermits->nr_permits != new->nr_permits ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		    memcmp(xpermits->permits, new->permits,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			   new->nr_permits * sizeof(struct afs_permit)) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		if (refcount_inc_not_zero(&xpermits->usage)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			replacement = xpermits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	for (i = 0; i < new->nr_permits; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		key_get(new->permits[i].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	hash_add_rcu(afs_permits_cache, &new->hash_node, new->h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	replacement = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	spin_unlock(&afs_permits_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	kfree(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	spin_lock(&vnode->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	zap = rcu_access_pointer(vnode->permit_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (!afs_cb_is_broken(cb_break, vnode) && zap == permits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		rcu_assign_pointer(vnode->permit_cache, replacement);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		zap = replacement;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	spin_unlock(&vnode->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	afs_put_permits(zap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) out_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	afs_put_permits(permits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) someone_else_changed_it_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	spin_unlock(&vnode->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) someone_else_changed_it:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	/* Someone else changed the cache under us - don't recheck at this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	 * time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static bool afs_check_permit_rcu(struct afs_vnode *vnode, struct key *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 				 afs_access_t *_access)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	const struct afs_permits *permits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	_enter("{%llx:%llu},%x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	       vnode->fid.vid, vnode->fid.vnode, key_serial(key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	/* check the permits to see if we've got one yet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	if (key == vnode->volume->cell->anonymous_key) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		*_access = vnode->status.anon_access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		_leave(" = t [anon %x]", *_access);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	permits = rcu_dereference(vnode->permit_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	if (permits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		for (i = 0; i < permits->nr_permits; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			if (permits->permits[i].key < key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			if (permits->permits[i].key > key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 			*_access = permits->permits[i].access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 			_leave(" = %u [perm %x]", !permits->invalidated, *_access);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 			return !permits->invalidated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	_leave(" = f");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)  * check with the fileserver to see if the directory or parent directory is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)  * permitted to be accessed with this authorisation, and if so, what access it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)  * is granted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) int afs_check_permit(struct afs_vnode *vnode, struct key *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		     afs_access_t *_access)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	struct afs_permits *permits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	bool valid = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	int i, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	_enter("{%llx:%llu},%x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	       vnode->fid.vid, vnode->fid.vnode, key_serial(key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	/* check the permits to see if we've got one yet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	if (key == vnode->volume->cell->anonymous_key) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		_debug("anon");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		*_access = vnode->status.anon_access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		valid = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		permits = rcu_dereference(vnode->permit_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		if (permits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 			for (i = 0; i < permits->nr_permits; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 				if (permits->permits[i].key < key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 					continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 				if (permits->permits[i].key > key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 				*_access = permits->permits[i].access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 				valid = !permits->invalidated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	if (!valid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		/* Check the status on the file we're actually interested in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		 * (the post-processing will cache the result).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		_debug("no valid permit");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		ret = afs_fetch_status(vnode, key, false, _access);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 			*_access = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 			_leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	_leave(" = 0 [access %x]", *_access);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)  * check the permissions on an AFS file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)  * - AFS ACLs are attached to directories only, and a file is controlled by its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)  *   parent directory's ACL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) int afs_permission(struct inode *inode, int mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	struct afs_vnode *vnode = AFS_FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	afs_access_t access;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	struct key *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	_enter("{{%llx:%llu},%lx},%x,",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	       vnode->fid.vid, vnode->fid.vnode, vnode->flags, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	if (mask & MAY_NOT_BLOCK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		key = afs_request_key_rcu(vnode->volume->cell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		if (IS_ERR(key))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 			return -ECHILD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		ret = -ECHILD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		if (!afs_check_validity(vnode) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 		    !afs_check_permit_rcu(vnode, key, &access))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 			goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 		key = afs_request_key(vnode->volume->cell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 		if (IS_ERR(key)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 			_leave(" = %ld [key]", PTR_ERR(key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 			return PTR_ERR(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 		ret = afs_validate(vnode, key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 			goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		/* check the permits to see if we've got one yet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		ret = afs_check_permit(vnode, key, &access);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 			goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	/* interpret the access mask */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	_debug("REQ %x ACC %x on %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	       mask, access, S_ISDIR(inode->i_mode) ? "dir" : "file");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	if (S_ISDIR(inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 		if (mask & (MAY_EXEC | MAY_READ | MAY_CHDIR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 			if (!(access & AFS_ACE_LOOKUP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 				goto permission_denied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		if (mask & MAY_WRITE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 			if (!(access & (AFS_ACE_DELETE | /* rmdir, unlink, rename from */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 					AFS_ACE_INSERT))) /* create, mkdir, symlink, rename to */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 				goto permission_denied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 		if (!(access & AFS_ACE_LOOKUP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 			goto permission_denied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 		if ((mask & MAY_EXEC) && !(inode->i_mode & S_IXUSR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 			goto permission_denied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 		if (mask & (MAY_EXEC | MAY_READ)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 			if (!(access & AFS_ACE_READ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 				goto permission_denied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 			if (!(inode->i_mode & S_IRUSR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 				goto permission_denied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 		} else if (mask & MAY_WRITE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 			if (!(access & AFS_ACE_WRITE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 				goto permission_denied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 			if (!(inode->i_mode & S_IWUSR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 				goto permission_denied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	key_put(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	_leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) permission_denied:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 	ret = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 	key_put(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 	_leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) void __exit afs_clean_up_permit_cache(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	for (i = 0; i < HASH_SIZE(afs_permits_cache); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 		WARN_ON_ONCE(!hlist_empty(&afs_permits_cache[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }