^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * eCryptfs: Linux filesystem encryption layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2008 International Business Machines Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "ecryptfs_kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static atomic_t ecryptfs_num_miscdev_opens;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * ecryptfs_miscdev_poll
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * @file: dev file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * @pt: dev poll table (ignored)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Returns the poll mask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static __poll_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) ecryptfs_miscdev_poll(struct file *file, poll_table *pt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct ecryptfs_daemon *daemon = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) __poll_t mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) mutex_lock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) printk(KERN_WARNING "%s: Attempt to poll on zombified "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) "daemon\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) goto out_unlock_daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (daemon->flags & ECRYPTFS_DAEMON_IN_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) goto out_unlock_daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) goto out_unlock_daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) daemon->flags |= ECRYPTFS_DAEMON_IN_POLL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) mutex_unlock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) poll_wait(file, &daemon->wait, pt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) mutex_lock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (!list_empty(&daemon->msg_ctx_out_queue))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) mask |= EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) out_unlock_daemon:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) daemon->flags &= ~ECRYPTFS_DAEMON_IN_POLL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) mutex_unlock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * ecryptfs_miscdev_open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * @inode: inode of miscdev handle (ignored)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * @file: file for miscdev handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) ecryptfs_miscdev_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct ecryptfs_daemon *daemon = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) mutex_lock(&ecryptfs_daemon_hash_mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) rc = ecryptfs_find_daemon_by_euid(&daemon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (!rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) goto out_unlock_daemon_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) rc = ecryptfs_spawn_daemon(&daemon, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) printk(KERN_ERR "%s: Error attempting to spawn daemon; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) "rc = [%d]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) goto out_unlock_daemon_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) mutex_lock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) rc = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) goto out_unlock_daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) daemon->flags |= ECRYPTFS_DAEMON_MISCDEV_OPEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) file->private_data = daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) atomic_inc(&ecryptfs_num_miscdev_opens);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) out_unlock_daemon:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) mutex_unlock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) out_unlock_daemon_list:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) mutex_unlock(&ecryptfs_daemon_hash_mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * ecryptfs_miscdev_release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * @inode: inode of fs/ecryptfs/euid handle (ignored)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * @file: file for fs/ecryptfs/euid handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * This keeps the daemon registered until the daemon sends another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * ioctl to fs/ecryptfs/ctl or until the kernel module unregisters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) ecryptfs_miscdev_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct ecryptfs_daemon *daemon = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) mutex_lock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) BUG_ON(!(daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) daemon->flags &= ~ECRYPTFS_DAEMON_MISCDEV_OPEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) atomic_dec(&ecryptfs_num_miscdev_opens);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) mutex_unlock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) mutex_lock(&ecryptfs_daemon_hash_mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) rc = ecryptfs_exorcise_daemon(daemon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) mutex_unlock(&ecryptfs_daemon_hash_mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) printk(KERN_CRIT "%s: Fatal error whilst attempting to "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) "shut down daemon; rc = [%d]. Please report this "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) "bug.\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * ecryptfs_send_miscdev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * @data: Data to send to daemon; may be NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * @data_size: Amount of data to send to daemon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * @msg_ctx: Message context, which is used to handle the reply. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * this is NULL, then we do not expect a reply.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * @msg_type: Type of message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * @msg_flags: Flags for message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * @daemon: eCryptfs daemon object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * Add msg_ctx to queue and then, if it exists, notify the blocked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * miscdevess about the data being available. Must be called with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * ecryptfs_daemon_hash_mux held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) int ecryptfs_send_miscdev(char *data, size_t data_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) u16 msg_flags, struct ecryptfs_daemon *daemon)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) struct ecryptfs_message *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) msg = kmalloc((sizeof(*msg) + data_size), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) mutex_lock(&msg_ctx->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) msg_ctx->msg = msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) msg_ctx->msg->index = msg_ctx->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) msg_ctx->msg->data_len = data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) msg_ctx->type = msg_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) memcpy(msg_ctx->msg->data, data, data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) msg_ctx->msg_size = (sizeof(*msg_ctx->msg) + data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) list_add_tail(&msg_ctx->daemon_out_list, &daemon->msg_ctx_out_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) mutex_unlock(&msg_ctx->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) mutex_lock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) daemon->num_queued_msg_ctx++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) wake_up_interruptible(&daemon->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) mutex_unlock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * miscdevfs packet format:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * Octet 0: Type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * Octets 1-4: network byte order msg_ctx->counter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * Octets 5-N0: Size of struct ecryptfs_message to follow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * Octets N0-N1: struct ecryptfs_message (including data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * Octets 5-N1 not written if the packet type does not include a message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) #define PKT_TYPE_SIZE 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) #define PKT_CTR_SIZE 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) #define MIN_NON_MSG_PKT_SIZE (PKT_TYPE_SIZE + PKT_CTR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) #define MIN_MSG_PKT_SIZE (PKT_TYPE_SIZE + PKT_CTR_SIZE \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) + ECRYPTFS_MIN_PKT_LEN_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* 4 + ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES comes from tag 65 packet format */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) #define MAX_MSG_PKT_SIZE (PKT_TYPE_SIZE + PKT_CTR_SIZE \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) + ECRYPTFS_MAX_PKT_LEN_SIZE \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) + sizeof(struct ecryptfs_message) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) + 4 + ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #define PKT_TYPE_OFFSET 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) #define PKT_CTR_OFFSET PKT_TYPE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) #define PKT_LEN_OFFSET (PKT_TYPE_SIZE + PKT_CTR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * ecryptfs_miscdev_read - format and send message from queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * @file: miscdevfs handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * @buf: User buffer into which to copy the next message on the daemon queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * @count: Amount of space available in @buf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * @ppos: Offset in file (ignored)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * Pulls the most recent message from the daemon queue, formats it for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * being sent via a miscdevfs handle, and copies it into @buf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * Returns the number of bytes copied into the user buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) struct ecryptfs_daemon *daemon = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct ecryptfs_msg_ctx *msg_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) size_t packet_length_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) char packet_length[ECRYPTFS_MAX_PKT_LEN_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) size_t total_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) mutex_lock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) printk(KERN_WARNING "%s: Attempt to read from zombified "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) "daemon\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) goto out_unlock_daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (daemon->flags & ECRYPTFS_DAEMON_IN_READ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) goto out_unlock_daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* This daemon will not go away so long as this flag is set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) daemon->flags |= ECRYPTFS_DAEMON_IN_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) check_list:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (list_empty(&daemon->msg_ctx_out_queue)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) mutex_unlock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) rc = wait_event_interruptible(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) daemon->wait, !list_empty(&daemon->msg_ctx_out_queue));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) mutex_lock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (rc < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) goto out_unlock_daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) goto out_unlock_daemon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (list_empty(&daemon->msg_ctx_out_queue)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /* Something else jumped in since the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * wait_event_interruptable() and removed the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * message from the queue; try again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) goto check_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) msg_ctx = list_first_entry(&daemon->msg_ctx_out_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct ecryptfs_msg_ctx, daemon_out_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) BUG_ON(!msg_ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) mutex_lock(&msg_ctx->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (msg_ctx->msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) rc = ecryptfs_write_packet_length(packet_length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) msg_ctx->msg_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) &packet_length_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) printk(KERN_WARNING "%s: Error writing packet length; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) "rc = [%d]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) goto out_unlock_msg_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) packet_length_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) msg_ctx->msg_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) total_length = (PKT_TYPE_SIZE + PKT_CTR_SIZE + packet_length_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) + msg_ctx->msg_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (count < total_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) printk(KERN_WARNING "%s: Only given user buffer of "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) "size [%zd], but we need [%zd] to read the "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) "pending message\n", __func__, count, total_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) goto out_unlock_msg_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (put_user(msg_ctx->type, buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) goto out_unlock_msg_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (put_user(cpu_to_be32(msg_ctx->counter),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) (__be32 __user *)(&buf[PKT_CTR_OFFSET])))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) goto out_unlock_msg_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) i = PKT_TYPE_SIZE + PKT_CTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (msg_ctx->msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (copy_to_user(&buf[i], packet_length, packet_length_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) goto out_unlock_msg_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) i += packet_length_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (copy_to_user(&buf[i], msg_ctx->msg, msg_ctx->msg_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) goto out_unlock_msg_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) i += msg_ctx->msg_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) rc = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) list_del(&msg_ctx->daemon_out_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) kfree(msg_ctx->msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) msg_ctx->msg = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) /* We do not expect a reply from the userspace daemon for any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * message type other than ECRYPTFS_MSG_REQUEST */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (msg_ctx->type != ECRYPTFS_MSG_REQUEST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) out_unlock_msg_ctx:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) mutex_unlock(&msg_ctx->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) out_unlock_daemon:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) daemon->flags &= ~ECRYPTFS_DAEMON_IN_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) mutex_unlock(&daemon->mux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * ecryptfs_miscdev_response - miscdevess response to message previously sent to daemon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * @data: Bytes comprising struct ecryptfs_message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * @data_size: sizeof(struct ecryptfs_message) + data len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * @seq: Sequence number for miscdev response packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static int ecryptfs_miscdev_response(struct ecryptfs_daemon *daemon, char *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) size_t data_size, u32 seq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct ecryptfs_message *msg = (struct ecryptfs_message *)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if ((sizeof(*msg) + msg->data_len) != data_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) printk(KERN_WARNING "%s: (sizeof(*msg) + msg->data_len) = "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) "[%zd]; data_size = [%zd]. Invalid packet.\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) (sizeof(*msg) + msg->data_len), data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) rc = ecryptfs_process_response(daemon, msg, seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) printk(KERN_ERR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) "Error processing response message; rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * ecryptfs_miscdev_write - handle write to daemon miscdev handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * @file: File for misc dev handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * @buf: Buffer containing user data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * @count: Amount of data in @buf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * @ppos: Pointer to offset in file (ignored)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * Returns the number of bytes read from @buf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ecryptfs_miscdev_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) __be32 counter_nbo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) u32 seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) size_t packet_size, packet_size_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) char *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) unsigned char packet_size_peek[ECRYPTFS_MAX_PKT_LEN_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) ssize_t rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (count == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) } else if (count == MIN_NON_MSG_PKT_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) /* Likely a harmless MSG_HELO or MSG_QUIT - no packet length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) goto memdup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) } else if (count < MIN_MSG_PKT_SIZE || count > MAX_MSG_PKT_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) printk(KERN_WARNING "%s: Acceptable packet size range is "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) "[%d-%zu], but amount of data written is [%zu].\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) __func__, MIN_MSG_PKT_SIZE, MAX_MSG_PKT_SIZE, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (copy_from_user(packet_size_peek, &buf[PKT_LEN_OFFSET],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) sizeof(packet_size_peek))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) printk(KERN_WARNING "%s: Error while inspecting packet size\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) rc = ecryptfs_parse_packet_length(packet_size_peek, &packet_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) &packet_size_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) printk(KERN_WARNING "%s: Error parsing packet length; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) "rc = [%zd]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) return rc;
^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) if ((PKT_TYPE_SIZE + PKT_CTR_SIZE + packet_size_length + packet_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) != count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) printk(KERN_WARNING "%s: Invalid packet size [%zu]\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) packet_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) memdup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) data = memdup_user(buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (IS_ERR(data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) printk(KERN_ERR "%s: memdup_user returned error [%ld]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) __func__, PTR_ERR(data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) return PTR_ERR(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) switch (data[PKT_TYPE_OFFSET]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) case ECRYPTFS_MSG_RESPONSE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (count < (MIN_MSG_PKT_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) + sizeof(struct ecryptfs_message))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) printk(KERN_WARNING "%s: Minimum acceptable packet "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) "size is [%zd], but amount of data written is "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) "only [%zd]. Discarding response packet.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) (MIN_MSG_PKT_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) + sizeof(struct ecryptfs_message)), count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) memcpy(&counter_nbo, &data[PKT_CTR_OFFSET], PKT_CTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) seq = be32_to_cpu(counter_nbo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) rc = ecryptfs_miscdev_response(file->private_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) &data[PKT_LEN_OFFSET + packet_size_length],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) packet_size, seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) printk(KERN_WARNING "%s: Failed to deliver miscdev "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) "response to requesting operation; rc = [%zd]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) case ECRYPTFS_MSG_HELO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) case ECRYPTFS_MSG_QUIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) ecryptfs_printk(KERN_WARNING, "Dropping miscdev "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) "message of unrecognized type [%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) data[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) rc = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) kfree(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) static const struct file_operations ecryptfs_miscdev_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) .open = ecryptfs_miscdev_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) .poll = ecryptfs_miscdev_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) .read = ecryptfs_miscdev_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) .write = ecryptfs_miscdev_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) .release = ecryptfs_miscdev_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) .llseek = noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) static struct miscdevice ecryptfs_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) .minor = MISC_DYNAMIC_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) .name = "ecryptfs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) .fops = &ecryptfs_miscdev_fops
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) * ecryptfs_init_ecryptfs_miscdev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) * Messages sent to the userspace daemon from the kernel are placed on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * a queue associated with the daemon. The next read against the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * miscdev handle by that daemon will return the oldest message placed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) * on the message queue for the daemon.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) int __init ecryptfs_init_ecryptfs_miscdev(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) atomic_set(&ecryptfs_num_miscdev_opens, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) rc = misc_register(&ecryptfs_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) printk(KERN_ERR "%s: Failed to register miscellaneous device "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) "for communications with userspace daemons; rc = [%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * ecryptfs_destroy_ecryptfs_miscdev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) * All of the daemons must be exorcised prior to calling this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) void ecryptfs_destroy_ecryptfs_miscdev(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) BUG_ON(atomic_read(&ecryptfs_num_miscdev_opens) != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) misc_deregister(&ecryptfs_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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