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-rw-r--r--fs/ecryptfs/Makefile2
-rw-r--r--fs/ecryptfs/crypto.c67
-rw-r--r--fs/ecryptfs/ecryptfs_kernel.h51
-rw-r--r--fs/ecryptfs/file.c34
-rw-r--r--fs/ecryptfs/inode.c52
-rw-r--r--fs/ecryptfs/keystore.c41
-rw-r--r--fs/ecryptfs/kthread.c203
-rw-r--r--fs/ecryptfs/main.c125
-rw-r--r--fs/ecryptfs/messaging.c118
-rw-r--r--fs/ecryptfs/miscdev.c59
-rw-r--r--fs/ecryptfs/mmap.c92
-rw-r--r--fs/ecryptfs/netlink.c249
12 files changed, 472 insertions, 621 deletions
diff --git a/fs/ecryptfs/Makefile b/fs/ecryptfs/Makefile
index 1e34a7fd488..2cc9ee4ad2e 100644
--- a/fs/ecryptfs/Makefile
+++ b/fs/ecryptfs/Makefile
@@ -4,4 +4,4 @@
obj-$(CONFIG_ECRYPT_FS) += ecryptfs.o
-ecryptfs-objs := dentry.o file.o inode.o main.o super.o mmap.o read_write.o crypto.o keystore.o messaging.o netlink.o miscdev.o debug.o
+ecryptfs-objs := dentry.o file.o inode.o main.o super.o mmap.o read_write.o crypto.o keystore.o messaging.o miscdev.o kthread.o debug.o
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index e2832bc7869..06db79d05c1 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -33,6 +33,7 @@
#include <linux/crypto.h>
#include <linux/file.h>
#include <linux/scatterlist.h>
+#include <asm/unaligned.h>
#include "ecryptfs_kernel.h"
static int
@@ -474,8 +475,8 @@ int ecryptfs_encrypt_page(struct page *page)
{
struct inode *ecryptfs_inode;
struct ecryptfs_crypt_stat *crypt_stat;
- char *enc_extent_virt = NULL;
- struct page *enc_extent_page;
+ char *enc_extent_virt;
+ struct page *enc_extent_page = NULL;
loff_t extent_offset;
int rc = 0;
@@ -491,14 +492,14 @@ int ecryptfs_encrypt_page(struct page *page)
page->index);
goto out;
}
- enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
- if (!enc_extent_virt) {
+ enc_extent_page = alloc_page(GFP_USER);
+ if (!enc_extent_page) {
rc = -ENOMEM;
ecryptfs_printk(KERN_ERR, "Error allocating memory for "
"encrypted extent\n");
goto out;
}
- enc_extent_page = virt_to_page(enc_extent_virt);
+ enc_extent_virt = kmap(enc_extent_page);
for (extent_offset = 0;
extent_offset < (PAGE_CACHE_SIZE / crypt_stat->extent_size);
extent_offset++) {
@@ -526,7 +527,10 @@ int ecryptfs_encrypt_page(struct page *page)
}
}
out:
- kfree(enc_extent_virt);
+ if (enc_extent_page) {
+ kunmap(enc_extent_page);
+ __free_page(enc_extent_page);
+ }
return rc;
}
@@ -608,8 +612,8 @@ int ecryptfs_decrypt_page(struct page *page)
{
struct inode *ecryptfs_inode;
struct ecryptfs_crypt_stat *crypt_stat;
- char *enc_extent_virt = NULL;
- struct page *enc_extent_page;
+ char *enc_extent_virt;
+ struct page *enc_extent_page = NULL;
unsigned long extent_offset;
int rc = 0;
@@ -626,14 +630,14 @@ int ecryptfs_decrypt_page(struct page *page)
page->index);
goto out;
}
- enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
- if (!enc_extent_virt) {
+ enc_extent_page = alloc_page(GFP_USER);
+ if (!enc_extent_page) {
rc = -ENOMEM;
ecryptfs_printk(KERN_ERR, "Error allocating memory for "
"encrypted extent\n");
goto out;
}
- enc_extent_page = virt_to_page(enc_extent_virt);
+ enc_extent_virt = kmap(enc_extent_page);
for (extent_offset = 0;
extent_offset < (PAGE_CACHE_SIZE / crypt_stat->extent_size);
extent_offset++) {
@@ -661,7 +665,10 @@ int ecryptfs_decrypt_page(struct page *page)
}
}
out:
- kfree(enc_extent_virt);
+ if (enc_extent_page) {
+ kunmap(enc_extent_page);
+ __free_page(enc_extent_page);
+ }
return rc;
}
@@ -1032,10 +1039,8 @@ static int contains_ecryptfs_marker(char *data)
{
u32 m_1, m_2;
- memcpy(&m_1, data, 4);
- m_1 = be32_to_cpu(m_1);
- memcpy(&m_2, (data + 4), 4);
- m_2 = be32_to_cpu(m_2);
+ m_1 = get_unaligned_be32(data);
+ m_2 = get_unaligned_be32(data + 4);
if ((m_1 ^ MAGIC_ECRYPTFS_MARKER) == m_2)
return 1;
ecryptfs_printk(KERN_DEBUG, "m_1 = [0x%.8x]; m_2 = [0x%.8x]; "
@@ -1073,8 +1078,7 @@ static int ecryptfs_process_flags(struct ecryptfs_crypt_stat *crypt_stat,
int i;
u32 flags;
- memcpy(&flags, page_virt, 4);
- flags = be32_to_cpu(flags);
+ flags = get_unaligned_be32(page_virt);
for (i = 0; i < ((sizeof(ecryptfs_flag_map)
/ sizeof(struct ecryptfs_flag_map_elem))); i++)
if (flags & ecryptfs_flag_map[i].file_flag) {
@@ -1100,11 +1104,9 @@ static void write_ecryptfs_marker(char *page_virt, size_t *written)
get_random_bytes(&m_1, (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2));
m_2 = (m_1 ^ MAGIC_ECRYPTFS_MARKER);
- m_1 = cpu_to_be32(m_1);
- memcpy(page_virt, &m_1, (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2));
- m_2 = cpu_to_be32(m_2);
- memcpy(page_virt + (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2), &m_2,
- (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2));
+ put_unaligned_be32(m_1, page_virt);
+ page_virt += (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2);
+ put_unaligned_be32(m_2, page_virt);
(*written) = MAGIC_ECRYPTFS_MARKER_SIZE_BYTES;
}
@@ -1121,8 +1123,7 @@ write_ecryptfs_flags(char *page_virt, struct ecryptfs_crypt_stat *crypt_stat,
flags |= ecryptfs_flag_map[i].file_flag;
/* Version is in top 8 bits of the 32-bit flag vector */
flags |= ((((u8)crypt_stat->file_version) << 24) & 0xFF000000);
- flags = cpu_to_be32(flags);
- memcpy(page_virt, &flags, 4);
+ put_unaligned_be32(flags, page_virt);
(*written) = 4;
}
@@ -1238,11 +1239,9 @@ ecryptfs_write_header_metadata(char *virt,
num_header_extents_at_front =
(u16)(crypt_stat->num_header_bytes_at_front
/ crypt_stat->extent_size);
- header_extent_size = cpu_to_be32(header_extent_size);
- memcpy(virt, &header_extent_size, 4);
+ put_unaligned_be32(header_extent_size, virt);
virt += 4;
- num_header_extents_at_front = cpu_to_be16(num_header_extents_at_front);
- memcpy(virt, &num_header_extents_at_front, 2);
+ put_unaligned_be16(num_header_extents_at_front, virt);
(*written) = 6;
}
@@ -1410,15 +1409,13 @@ static int parse_header_metadata(struct ecryptfs_crypt_stat *crypt_stat,
u32 header_extent_size;
u16 num_header_extents_at_front;
- memcpy(&header_extent_size, virt, sizeof(u32));
- header_extent_size = be32_to_cpu(header_extent_size);
- virt += sizeof(u32);
- memcpy(&num_header_extents_at_front, virt, sizeof(u16));
- num_header_extents_at_front = be16_to_cpu(num_header_extents_at_front);
+ header_extent_size = get_unaligned_be32(virt);
+ virt += sizeof(__be32);
+ num_header_extents_at_front = get_unaligned_be16(virt);
crypt_stat->num_header_bytes_at_front =
(((size_t)num_header_extents_at_front
* (size_t)header_extent_size));
- (*bytes_read) = (sizeof(u32) + sizeof(u16));
+ (*bytes_read) = (sizeof(__be32) + sizeof(__be16));
if ((validate_header_size == ECRYPTFS_VALIDATE_HEADER_SIZE)
&& (crypt_stat->num_header_bytes_at_front
< ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE)) {
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index c15c25745e0..3504cf9df35 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -79,11 +79,6 @@
#define ECRYPTFS_MAX_PKI_NAME_BYTES 16
#define ECRYPTFS_DEFAULT_NUM_USERS 4
#define ECRYPTFS_MAX_NUM_USERS 32768
-#define ECRYPTFS_TRANSPORT_NETLINK 0
-#define ECRYPTFS_TRANSPORT_CONNECTOR 1
-#define ECRYPTFS_TRANSPORT_RELAYFS 2
-#define ECRYPTFS_TRANSPORT_MISCDEV 3
-#define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_MISCDEV
#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
#define RFC2440_CIPHER_DES3_EDE 0x02
@@ -400,8 +395,6 @@ struct ecryptfs_msg_ctx {
struct mutex mux;
};
-extern unsigned int ecryptfs_transport;
-
struct ecryptfs_daemon;
struct ecryptfs_daemon {
@@ -559,10 +552,25 @@ extern struct kmem_cache *ecryptfs_key_record_cache;
extern struct kmem_cache *ecryptfs_key_sig_cache;
extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
extern struct kmem_cache *ecryptfs_key_tfm_cache;
+extern struct kmem_cache *ecryptfs_open_req_cache;
+
+struct ecryptfs_open_req {
+#define ECRYPTFS_REQ_PROCESSED 0x00000001
+#define ECRYPTFS_REQ_DROPPED 0x00000002
+#define ECRYPTFS_REQ_ZOMBIE 0x00000004
+ u32 flags;
+ struct file **lower_file;
+ struct dentry *lower_dentry;
+ struct vfsmount *lower_mnt;
+ wait_queue_head_t wait;
+ struct mutex mux;
+ struct list_head kthread_ctl_list;
+};
+#define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001
int ecryptfs_interpose(struct dentry *hidden_dentry,
struct dentry *this_dentry, struct super_block *sb,
- int flag);
+ u32 flags);
int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat,
const char *name, int length,
@@ -612,31 +620,20 @@ int
ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags);
int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
-int ecryptfs_process_helo(unsigned int transport, uid_t euid,
- struct user_namespace *user_ns, struct pid *pid);
+int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
+ struct pid *pid);
int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
struct pid *pid);
int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
struct user_namespace *user_ns, struct pid *pid,
u32 seq);
-int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
+int ecryptfs_send_message(char *data, int data_len,
struct ecryptfs_msg_ctx **msg_ctx);
int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
struct ecryptfs_message **emsg);
-int ecryptfs_init_messaging(unsigned int transport);
-void ecryptfs_release_messaging(unsigned int transport);
+int ecryptfs_init_messaging(void);
+void ecryptfs_release_messaging(void);
-int ecryptfs_send_netlink(char *data, int data_len,
- struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
- u16 msg_flags, struct pid *daemon_pid);
-int ecryptfs_init_netlink(void);
-void ecryptfs_release_netlink(void);
-
-int ecryptfs_send_connector(char *data, int data_len,
- struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
- u16 msg_flags, struct pid *daemon_pid);
-int ecryptfs_init_connector(void);
-void ecryptfs_release_connector(void);
void
ecryptfs_write_header_metadata(char *virt,
struct ecryptfs_crypt_stat *crypt_stat,
@@ -690,5 +687,11 @@ void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
int
ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
struct user_namespace *user_ns, struct pid *pid);
+int ecryptfs_init_kthread(void);
+void ecryptfs_destroy_kthread(void);
+int ecryptfs_privileged_open(struct file **lower_file,
+ struct dentry *lower_dentry,
+ struct vfsmount *lower_mnt);
+int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry);
#endif /* #ifndef ECRYPTFS_KERNEL_H */
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 24749bf0668..eb3dc4c7ac0 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -71,12 +71,11 @@ struct ecryptfs_getdents_callback {
void *dirent;
struct dentry *dentry;
filldir_t filldir;
- int err;
int filldir_called;
int entries_written;
};
-/* Inspired by generic filldir in fs/readir.c */
+/* Inspired by generic filldir in fs/readdir.c */
static int
ecryptfs_filldir(void *dirent, const char *name, int namelen, loff_t offset,
u64 ino, unsigned int d_type)
@@ -125,18 +124,18 @@ static int ecryptfs_readdir(struct file *file, void *dirent, filldir_t filldir)
buf.dirent = dirent;
buf.dentry = file->f_path.dentry;
buf.filldir = filldir;
-retry:
buf.filldir_called = 0;
buf.entries_written = 0;
- buf.err = 0;
rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
- if (buf.err)
- rc = buf.err;
- if (buf.filldir_called && !buf.entries_written)
- goto retry;
file->f_pos = lower_file->f_pos;
+ if (rc < 0)
+ goto out;
+ if (buf.filldir_called && !buf.entries_written)
+ goto out;
if (rc >= 0)
- fsstack_copy_attr_atime(inode, lower_file->f_path.dentry->d_inode);
+ fsstack_copy_attr_atime(inode,
+ lower_file->f_path.dentry->d_inode);
+out:
return rc;
}
@@ -192,6 +191,23 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
| ECRYPTFS_ENCRYPTED);
}
mutex_unlock(&crypt_stat->cs_mutex);
+ if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
+ && !(file->f_flags & O_RDONLY)) {
+ rc = -EPERM;
+ printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
+ "file must hence be opened RO\n", __func__);
+ goto out;
+ }
+ if (!ecryptfs_inode_to_private(inode)->lower_file) {
+ rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
+ if (rc) {
+ printk(KERN_ERR "%s: Error attempting to initialize "
+ "the persistent file for the dentry with name "
+ "[%s]; rc = [%d]\n", __func__,
+ ecryptfs_dentry->d_name.name, rc);
+ goto out;
+ }
+ }
ecryptfs_set_file_lower(
file, ecryptfs_inode_to_private(inode)->lower_file);
if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index c92cc1c00aa..89209f00f9c 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -31,6 +31,7 @@
#include <linux/mount.h>
#include <linux/crypto.h>
#include <linux/fs_stack.h>
+#include <asm/unaligned.h>
#include "ecryptfs_kernel.h"
static struct dentry *lock_parent(struct dentry *dentry)
@@ -188,6 +189,16 @@ static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
"context; rc = [%d]\n", rc);
goto out;
}
+ if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
+ rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
+ if (rc) {
+ printk(KERN_ERR "%s: Error attempting to initialize "
+ "the persistent file for the dentry with name "
+ "[%s]; rc = [%d]\n", __func__,
+ ecryptfs_dentry->d_name.name, rc);
+ goto out;
+ }
+ }
rc = ecryptfs_write_metadata(ecryptfs_dentry);
if (rc) {
printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
@@ -307,10 +318,11 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
d_add(dentry, NULL);
goto out;
}
- rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1);
+ rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb,
+ ECRYPTFS_INTERPOSE_FLAG_D_ADD);
if (rc) {
ecryptfs_printk(KERN_ERR, "Error interposing\n");
- goto out_dput;
+ goto out;
}
if (S_ISDIR(lower_inode->i_mode)) {
ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n");
@@ -336,11 +348,21 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
rc = -ENOMEM;
ecryptfs_printk(KERN_ERR,
"Cannot ecryptfs_kmalloc a page\n");
- goto out_dput;
+ goto out;
}
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
ecryptfs_set_default_sizes(crypt_stat);
+ if (!ecryptfs_inode_to_private(dentry->d_inode)->lower_file) {
+ rc = ecryptfs_init_persistent_file(dentry);
+ if (rc) {
+ printk(KERN_ERR "%s: Error attempting to initialize "
+ "the persistent file for the dentry with name "
+ "[%s]; rc = [%d]\n", __func__,
+ dentry->d_name.name, rc);
+ goto out;
+ }
+ }
rc = ecryptfs_read_and_validate_header_region(page_virt,
dentry->d_inode);
if (rc) {
@@ -364,8 +386,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
else
file_size = i_size_read(lower_dentry->d_inode);
} else {
- memcpy(&file_size, page_virt, sizeof(file_size));
- file_size = be64_to_cpu(file_size);
+ file_size = get_unaligned_be64(page_virt);
}
i_size_write(dentry->d_inode, (loff_t)file_size);
kmem_cache_free(ecryptfs_header_cache_2, page_virt);
@@ -444,7 +465,6 @@ static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
int rc;
struct dentry *lower_dentry;
struct dentry *lower_dir_dentry;
- umode_t mode;
char *encoded_symname;
int encoded_symlen;
struct ecryptfs_crypt_stat *crypt_stat = NULL;
@@ -452,7 +472,6 @@ static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
lower_dentry = ecryptfs_dentry_to_lower(dentry);
dget(lower_dentry);
lower_dir_dentry = lock_parent(lower_dentry);
- mode = S_IALLUGO;
encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname,
strlen(symname),
&encoded_symname);
@@ -461,7 +480,7 @@ static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
goto out_lock;
}
rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
- encoded_symname, mode);
+ encoded_symname);
kfree(encoded_symname);
if (rc || !lower_dentry->d_inode)
goto out_lock;
@@ -809,22 +828,9 @@ out:
}
static int
-ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd)
+ecryptfs_permission(struct inode *inode, int mask)
{
- int rc;
-
- if (nd) {
- struct vfsmount *vfsmnt_save = nd->path.mnt;
- struct dentry *dentry_save = nd->path.dentry;
-
- nd->path.mnt = ecryptfs_dentry_to_lower_mnt(nd->path.dentry);
- nd->path.dentry = ecryptfs_dentry_to_lower(nd->path.dentry);
- rc = permission(ecryptfs_inode_to_lower(inode), mask, nd);
- nd->path.mnt = vfsmnt_save;
- nd->path.dentry = dentry_save;
- } else
- rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL);
- return rc;
+ return inode_permission(ecryptfs_inode_to_lower(inode), mask);
}
/**
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index e82b457180b..e22bc396134 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -44,15 +44,15 @@ static int process_request_key_err(long err_code)
int rc = 0;
switch (err_code) {
- case ENOKEY:
+ case -ENOKEY:
ecryptfs_printk(KERN_WARNING, "No key\n");
rc = -ENOENT;
break;
- case EKEYEXPIRED:
+ case -EKEYEXPIRED:
ecryptfs_printk(KERN_WARNING, "Key expired\n");
rc = -ETIME;
break;
- case EKEYREVOKED:
+ case -EKEYREVOKED:
ecryptfs_printk(KERN_WARNING, "Key revoked\n");
rc = -EINVAL;
break;
@@ -234,8 +234,8 @@ parse_tag_65_packet(struct ecryptfs_session_key *session_key, u8 *cipher_code,
}
i += data_len;
if (message_len < (i + m_size)) {
- ecryptfs_printk(KERN_ERR, "The received netlink message is "
- "shorter than expected\n");
+ ecryptfs_printk(KERN_ERR, "The message received from ecryptfsd "
+ "is shorter than expected\n");
rc = -EIO;
goto out;
}
@@ -438,8 +438,8 @@ decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
struct ecryptfs_msg_ctx *msg_ctx;
struct ecryptfs_message *msg = NULL;
char *auth_tok_sig;
- char *netlink_message;
- size_t netlink_message_length;
+ char *payload;
+ size_t payload_len;
int rc;
rc = ecryptfs_get_auth_tok_sig(&auth_tok_sig, auth_tok);
@@ -449,15 +449,15 @@ decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
goto out;
}
rc = write_tag_64_packet(auth_tok_sig, &(auth_tok->session_key),
- &netlink_message, &netlink_message_length);
+ &payload, &payload_len);
if (rc) {
ecryptfs_printk(KERN_ERR, "Failed to write tag 64 packet\n");
goto out;
}
- rc = ecryptfs_send_message(ecryptfs_transport, netlink_message,
- netlink_message_length, &msg_ctx);
+ rc = ecryptfs_send_message(payload, payload_len, &msg_ctx);
if (rc) {
- ecryptfs_printk(KERN_ERR, "Error sending netlink message\n");
+ ecryptfs_printk(KERN_ERR, "Error sending message to "
+ "ecryptfsd\n");
goto out;
}
rc = ecryptfs_wait_for_response(msg_ctx, &msg);
@@ -963,8 +963,7 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
printk(KERN_ERR "Could not find key with description: [%s]\n",
sig);
- process_request_key_err(PTR_ERR(*auth_tok_key));
- rc = -EINVAL;
+ rc = process_request_key_err(PTR_ERR(*auth_tok_key));
goto out;
}
(*auth_tok) = ecryptfs_get_key_payload_data(*auth_tok_key);
@@ -1334,23 +1333,22 @@ pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok,
struct ecryptfs_key_record *key_rec)
{
struct ecryptfs_msg_ctx *msg_ctx = NULL;
- char *netlink_payload;
- size_t netlink_payload_length;
+ char *payload = NULL;
+ size_t payload_len;
struct ecryptfs_message *msg;
int rc;
rc = write_tag_66_packet(auth_tok->token.private_key.signature,
ecryptfs_code_for_cipher_string(crypt_stat),
- crypt_stat, &netlink_payload,
- &netlink_payload_length);
+ crypt_stat, &payload, &payload_len);
if (rc) {
ecryptfs_printk(KERN_ERR, "Error generating tag 66 packet\n");
goto out;
}
- rc = ecryptfs_send_message(ecryptfs_transport, netlink_payload,
- netlink_payload_length, &msg_ctx);
+ rc = ecryptfs_send_message(payload, payload_len, &msg_ctx);
if (rc) {
- ecryptfs_printk(KERN_ERR, "Error sending netlink message\n");
+ ecryptfs_printk(KERN_ERR, "Error sending message to "
+ "ecryptfsd\n");
goto out;
}
rc = ecryptfs_wait_for_response(msg_ctx, &msg);
@@ -1365,8 +1363,7 @@ pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok,
ecryptfs_printk(KERN_ERR, "Error parsing tag 67 packet\n");
kfree(msg);
out:
- if (netlink_payload)
- kfree(netlink_payload);
+ kfree(payload);
return rc;
}
/**
diff --git a/fs/ecryptfs/kthread.c b/fs/ecryptfs/kthread.c
new file mode 100644
index 00000000000..c440c6b58b2
--- /dev/null
+++ b/fs/ecryptfs/kthread.c
@@ -0,0 +1,203 @@
+/**
+ * eCryptfs: Linux filesystem encryption layer
+ *
+ * Copyright (C) 2008 International Business Machines Corp.
+ * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/wait.h>
+#include <linux/mount.h>
+#include "ecryptfs_kernel.h"
+
+struct kmem_cache *ecryptfs_open_req_cache;
+
+static struct ecryptfs_kthread_ctl {
+#define ECRYPTFS_KTHREAD_ZOMBIE 0x00000001
+ u32 flags;
+ struct mutex mux;
+ struct list_head req_list;
+ wait_queue_head_t wait;
+} ecryptfs_kthread_ctl;
+
+static struct task_struct *ecryptfs_kthread;
+
+/**
+ * ecryptfs_threadfn
+ * @ignored: ignored
+ *
+ * The eCryptfs kernel thread that has the responsibility of getting
+ * the lower persistent file with RW permissions.
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+static int ecryptfs_threadfn(void *ignored)
+{
+ set_freezable();
+ while (1) {
+ struct ecryptfs_open_req *req;
+
+ wait_event_freezable(
+ ecryptfs_kthread_ctl.wait,
+ (!list_empty(&ecryptfs_kthread_ctl.req_list)
+ || kthread_should_stop()));
+ mutex_lock(&ecryptfs_kthread_ctl.mux);
+ if (ecryptfs_kthread_ctl.flags & ECRYPTFS_KTHREAD_ZOMBIE) {
+ mutex_unlock(&ecryptfs_kthread_ctl.mux);
+ goto out;
+ }
+ while (!list_empty(&ecryptfs_kthread_ctl.req_list)) {
+ req = list_first_entry(&ecryptfs_kthread_ctl.req_list,
+ struct ecryptfs_open_req,
+ kthread_ctl_list);
+ mutex_lock(&req->mux);
+ list_del(&req->kthread_ctl_list);
+ if (!(req->flags & ECRYPTFS_REQ_ZOMBIE)) {
+ dget(req->lower_dentry);
+ mntget(req->lower_mnt);
+ (*req->lower_file) = dentry_open(
+ req->lower_dentry, req->lower_mnt,
+ (O_RDWR | O_LARGEFILE));
+ req->flags |= ECRYPTFS_REQ_PROCESSED;
+ }
+ wake_up(&req->wait);
+ mutex_unlock(&req->mux);
+ }
+ mutex_unlock(&ecryptfs_kthread_ctl.mux);
+ }
+out:
+ return 0;
+}
+
+int ecryptfs_init_kthread(void)
+{
+ int rc = 0;
+
+ mutex_init(&ecryptfs_kthread_ctl.mux);
+ init_waitqueue_head(&ecryptfs_kthread_ctl.wait);
+ INIT_LIST_HEAD(&ecryptfs_kthread_ctl.req_list);
+ ecryptfs_kthread = kthread_run(&ecryptfs_threadfn, NULL,
+ "ecryptfs-kthread");
+ if (IS_ERR(ecryptfs_kthread)) {
+ rc = PTR_ERR(ecryptfs_kthread);
+ printk(KERN_ERR "%s: Failed to create kernel thread; rc = [%d]"
+ "\n", __func__, rc);
+ }
+ return rc;
+}
+
+void ecryptfs_destroy_kthread(void)
+{
+ struct ecryptfs_open_req *req;
+
+ mutex_lock(&ecryptfs_kthread_ctl.mux);
+ ecryptfs_kthread_ctl.flags |= ECRYPTFS_KTHREAD_ZOMBIE;
+ list_for_each_entry(req, &ecryptfs_kthread_ctl.req_list,
+ kthread_ctl_list) {
+ mutex_lock(&req->mux);
+ req->flags |= ECRYPTFS_REQ_ZOMBIE;
+ wake_up(&req->wait);
+ mutex_unlock(&req->mux);
+ }
+ mutex_unlock(&ecryptfs_kthread_ctl.mux);
+ kthread_stop(ecryptfs_kthread);
+ wake_up(&ecryptfs_kthread_ctl.wait);
+}
+
+/**
+ * ecryptfs_privileged_open
+ * @lower_file: Result of dentry_open by root on lower dentry
+ * @lower_dentry: Lower dentry for file to open
+ * @lower_mnt: Lower vfsmount for file to open
+ *
+ * This function gets a r/w file opened againt the lower dentry.
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+int ecryptfs_privileged_open(struct file **lower_file,
+ struct dentry *lower_dentry,
+ struct vfsmount *lower_mnt)
+{
+ struct ecryptfs_open_req *req;
+ int rc = 0;
+
+ /* Corresponding dput() and mntput() are done when the
+ * persistent file is fput() when the eCryptfs inode is
+ * destroyed. */
+ dget(lower_dentry);
+ mntget(lower_mnt);
+ (*lower_file) = dentry_open(lower_dentry, lower_mnt,
+ (O_RDWR | O_LARGEFILE));
+ if (!IS_ERR(*lower_file))
+ goto out;
+ req = kmem_cache_alloc(ecryptfs_open_req_cache, GFP_KERNEL);
+ if (!req) {
+ rc = -ENOMEM;
+ goto out;
+ }
+ mutex_init(&req->mux);
+ req->lower_file = lower_file;
+ req->lower_dentry = lower_dentry;
+ req->lower_mnt = lower_mnt;
+ init_waitqueue_head(&req->wait);
+ req->flags = 0;
+ mutex_lock(&ecryptfs_kthread_ctl.mux);
+ if (ecryptfs_kthread_ctl.flags & ECRYPTFS_KTHREAD_ZOMBIE) {
+ rc = -EIO;
+ mutex_unlock(&ecryptfs_kthread_ctl.mux);
+ printk(KERN_ERR "%s: We are in the middle of shutting down; "
+ "aborting privileged request to open lower file\n",
+ __func__);
+ goto out_free;
+ }
+ list_add_tail(&req->kthread_ctl_list, &ecryptfs_kthread_ctl.req_list);
+ mutex_unlock(&ecryptfs_kthread_ctl.mux);
+ wake_up(&ecryptfs_kthread_ctl.wait);
+ wait_event(req->wait, (req->flags != 0));
+ mutex_lock(&req->mux);
+ BUG_ON(req->flags == 0);
+ if (req->flags & ECRYPTFS_REQ_DROPPED
+ || req->flags & ECRYPTFS_REQ_ZOMBIE) {
+ rc = -EIO;
+ printk(KERN_WARNING "%s: Privileged open request dropped\n",
+ __func__);
+ goto out_unlock;
+ }
+ if (IS_ERR(*req->lower_file)) {
+ rc = PTR_ERR(*req->lower_file);
+ dget(lower_dentry);
+ mntget(lower_mnt);
+ (*lower_file) = dentry_open(lower_dentry, lower_mnt,
+ (O_RDONLY | O_LARGEFILE));
+ if (IS_ERR(*lower_file)) {
+ rc = PTR_ERR(*req->lower_file);
+ (*lower_file) = NULL;
+ printk(KERN_WARNING "%s: Error attempting privileged "
+ "open of lower file with either RW or RO "
+ "perms; rc = [%d]. Giving up.\n",
+ __func__, rc);
+ }
+ }
+out_unlock:
+ mutex_unlock(&req->mux);
+out_free:
+ kmem_cache_free(ecryptfs_open_req_cache, req);
+out:
+ return rc;
+}
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index d603631601e..64d2ba980df 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -30,7 +30,6 @@
#include <linux/namei.h>
#include <linux/skbuff.h>
#include <linux/crypto.h>
-#include <linux/netlink.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/key.h>
@@ -49,8 +48,7 @@ MODULE_PARM_DESC(ecryptfs_verbosity,
"0, which is Quiet)");
/**
- * Module parameter that defines the number of netlink message buffer
- * elements
+ * Module parameter that defines the number of message buffer elements
*/
unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
@@ -60,9 +58,9 @@ MODULE_PARM_DESC(ecryptfs_message_buf_len,
/**
* Module parameter that defines the maximum guaranteed amount of time to wait
- * for a response through netlink. The actual sleep time will be, more than
+ * for a response from ecryptfsd. The actual sleep time will be, more than
* likely, a small amount greater than this specified value, but only less if
- * the netlink message successfully arrives.
+ * the message successfully arrives.
*/
signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
@@ -83,8 +81,6 @@ module_param(ecryptfs_number_of_users, uint, 0);
MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
"concurrent users of eCryptfs");
-unsigned int ecryptfs_transport = ECRYPTFS_DEFAULT_TRANSPORT;
-
void __ecryptfs_printk(const char *fmt, ...)
{
va_list args;
@@ -117,7 +113,7 @@ void __ecryptfs_printk(const char *fmt, ...)
*
* Returns zero on success; non-zero otherwise
*/
-static int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
+int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
{
struct ecryptfs_inode_info *inode_info =
ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
@@ -130,26 +126,12 @@ static int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
- /* Corresponding dput() and mntput() are done when the
- * persistent file is fput() when the eCryptfs inode
- * is destroyed. */
- dget(lower_dentry);
- mntget(lower_mnt);
- inode_info->lower_file = dentry_open(lower_dentry,
- lower_mnt,
- (O_RDWR | O_LARGEFILE));
- if (IS_ERR(inode_info->lower_file)) {
- dget(lower_dentry);
- mntget(lower_mnt);
- inode_info->lower_file = dentry_open(lower_dentry,
- lower_mnt,
- (O_RDONLY
- | O_LARGEFILE));
- }
- if (IS_ERR(inode_info->lower_file)) {
+ rc = ecryptfs_privileged_open(&inode_info->lower_file,
+ lower_dentry, lower_mnt);
+ if (rc || IS_ERR(inode_info->lower_file)) {
printk(KERN_ERR "Error opening lower persistent file "
- "for lower_dentry [0x%p] and lower_mnt [0x%p]\n",
- lower_dentry, lower_mnt);
+ "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
+ "rc = [%d]\n", lower_dentry, lower_mnt, rc);
rc = PTR_ERR(inode_info->lower_file);
inode_info->lower_file = NULL;
}
@@ -163,14 +145,14 @@ static int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
* @lower_dentry: Existing dentry in the lower filesystem
* @dentry: ecryptfs' dentry
* @sb: ecryptfs's super_block
- * @flag: If set to true, then d_add is called, else d_instantiate is called
+ * @flags: flags to govern behavior of interpose procedure
*
* Interposes upper and lower dentries.
*
* Returns zero on success; non-zero otherwise
*/
int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
- struct super_block *sb, int flag)
+ struct super_block *sb, u32 flags)
{
struct inode *lower_inode;
struct inode *inode;
@@ -207,7 +189,7 @@ int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
init_special_inode(inode, lower_inode->i_mode,
lower_inode->i_rdev);
dentry->d_op = &ecryptfs_dops;
- if (flag)
+ if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD)
d_add(dentry, inode);
else
d_instantiate(dentry, inode);
@@ -215,13 +197,6 @@ int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
/* This size will be overwritten for real files w/ headers and
* other metadata */
fsstack_copy_inode_size(inode, lower_inode);
- rc = ecryptfs_init_persistent_file(dentry);
- if (rc) {
- printk(KERN_ERR "%s: Error attempting to initialize the "
- "persistent file for the dentry with name [%s]; "
- "rc = [%d]\n", __func__, dentry->d_name.name, rc);
- goto out;
- }
out:
return rc;
}
@@ -232,7 +207,7 @@ enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
ecryptfs_opt_encrypted_view, ecryptfs_opt_err };
-static match_table_t tokens = {
+static const match_table_t tokens = {
{ecryptfs_opt_sig, "sig=%s"},
{ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
{ecryptfs_opt_cipher, "cipher=%s"},
@@ -262,10 +237,11 @@ static int ecryptfs_init_global_auth_toks(
"session keyring for sig specified in mount "
"option: [%s]\n", global_auth_tok->sig);
global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
- rc = 0;
+ goto out;
} else
global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
}
+out:
return rc;
}
@@ -314,7 +290,6 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
char *cipher_name_dst;
char *cipher_name_src;
char *cipher_key_bytes_src;
- int cipher_name_len;
if (!options) {
rc = -EINVAL;
@@ -395,17 +370,12 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
goto out;
}
if (!cipher_name_set) {
- cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
- if (unlikely(cipher_name_len
- >= ECRYPTFS_MAX_CIPHER_NAME_SIZE)) {
- rc = -EINVAL;
- BUG();
- goto out;
- }
- memcpy(mount_crypt_stat->global_default_cipher_name,
- ECRYPTFS_DEFAULT_CIPHER, cipher_name_len);
- mount_crypt_stat->global_default_cipher_name[cipher_name_len]
- = '\0';
+ int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
+
+ BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE);
+
+ strcpy(mount_crypt_stat->global_default_cipher_name,
+ ECRYPTFS_DEFAULT_CIPHER);
}
if (!cipher_key_bytes_set) {
mount_crypt_stat->global_default_cipher_key_size = 0;
@@ -430,7 +400,6 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
printk(KERN_WARNING "One or more global auth toks could not "
"properly register; rc = [%d]\n", rc);
}
- rc = 0;
out:
return rc;
}
@@ -502,31 +471,26 @@ out:
*/
static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
{
+ struct path path;
int rc;
- struct nameidata nd;
- struct dentry *lower_root;
- struct vfsmount *lower_mnt;
- memset(&nd, 0, sizeof(struct nameidata));
- rc = path_lookup(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
+ rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
if (rc) {
ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n");
goto out;
}
- lower_root = nd.path.dentry;
- lower_mnt = nd.path.mnt;
- ecryptfs_set_superblock_lower(sb, lower_root->d_sb);
- sb->s_maxbytes = lower_root->d_sb->s_maxbytes;
- sb->s_blocksize = lower_root->d_sb->s_blocksize;
- ecryptfs_set_dentry_lower(sb->s_root, lower_root);
- ecryptfs_set_dentry_lower_mnt(sb->s_root, lower_mnt);
- rc = ecryptfs_interpose(lower_root, sb->s_root, sb, 0);
+ ecryptfs_set_superblock_lower(sb, path.dentry->d_sb);
+ sb->s_maxbytes = path.dentry->d_sb->s_maxbytes;
+ sb->s_blocksize = path.dentry->d_sb->s_blocksize;
+ ecryptfs_set_dentry_lower(sb->s_root, path.dentry);
+ ecryptfs_set_dentry_lower_mnt(sb->s_root, path.mnt);
+ rc = ecryptfs_interpose(path.dentry, sb->s_root, sb, 0);
if (rc)
goto out_free;
rc = 0;
goto out;
out_free:
- path_put(&nd.path);
+ path_put(&path);
out:
return rc;
}
@@ -605,7 +569,7 @@ static struct file_system_type ecryptfs_fs_type = {
* Initializes the ecryptfs_inode_info_cache when it is created
*/
static void
-inode_info_init_once(struct kmem_cache *cachep, void *vptr)
+inode_info_init_once(void *vptr)
{
struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
@@ -616,7 +580,7 @@ static struct ecryptfs_cache_info {
struct kmem_cache **cache;
const char *name;
size_t size;
- void (*ctor)(struct kmem_cache *cache, void *obj);
+ void (*ctor)(void *obj);
} ecryptfs_cache_infos[] = {
{
.cache = &ecryptfs_auth_tok_list_item_cache,
@@ -679,6 +643,11 @@ static struct ecryptfs_cache_info {
.name = "ecryptfs_key_tfm_cache",
.size = sizeof(struct ecryptfs_key_tfm),
},
+ {
+ .cache = &ecryptfs_open_req_cache,
+ .name = "ecryptfs_open_req_cache",
+ .size = sizeof(struct ecryptfs_open_req),
+ },
};
static void ecryptfs_free_kmem_caches(void)
@@ -795,12 +764,19 @@ static int __init ecryptfs_init(void)
printk(KERN_ERR "sysfs registration failed\n");
goto out_unregister_filesystem;
}
- rc = ecryptfs_init_messaging(ecryptfs_transport);
+ rc = ecryptfs_init_kthread();
if (rc) {
- ecryptfs_printk(KERN_ERR, "Failure occured while attempting to "
- "initialize the eCryptfs netlink socket\n");
+ printk(KERN_ERR "%s: kthread initialization failed; "
+ "rc = [%d]\n", __func__, rc);
goto out_do_sysfs_unregistration;
}
+ rc = ecryptfs_init_messaging();
+ if (rc) {
+ printk(KERN_ERR "Failure occured while attempting to "
+ "initialize the communications channel to "
+ "ecryptfsd\n");
+ goto out_destroy_kthread;
+ }
rc = ecryptfs_init_crypto();
if (rc) {
printk(KERN_ERR "Failure whilst attempting to init crypto; "
@@ -813,7 +789,9 @@ static int __init ecryptfs_init(void)
goto out;
out_release_messaging:
- ecryptfs_release_messaging(ecryptfs_transport);
+ ecryptfs_release_messaging();
+out_destroy_kthread:
+ ecryptfs_destroy_kthread();
out_do_sysfs_unregistration:
do_sysfs_unregistration();
out_unregister_filesystem:
@@ -832,7 +810,8 @@ static void __exit ecryptfs_exit(void)
if (rc)
printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
"rc = [%d]\n", rc);
- ecryptfs_release_messaging(ecryptfs_transport);
+ ecryptfs_release_messaging();
+ ecryptfs_destroy_kthread();
do_sysfs_unregistration();
unregister_filesystem(&ecryptfs_fs_type);
ecryptfs_free_kmem_caches();
diff --git a/fs/ecryptfs/messaging.c b/fs/ecryptfs/messaging.c
index 1b5c20058ac..c6983978a31 100644
--- a/fs/ecryptfs/messaging.c
+++ b/fs/ecryptfs/messaging.c
@@ -134,12 +134,11 @@ out:
}
static int
-ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
- u8 msg_type, struct ecryptfs_msg_ctx **msg_ctx);
+ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
+ struct ecryptfs_msg_ctx **msg_ctx);
/**
* ecryptfs_send_raw_message
- * @transport: Transport type
* @msg_type: Message type
* @daemon: Daemon struct for recipient of message
*
@@ -150,38 +149,25 @@ ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
*
* Returns zero on success; non-zero otherwise
*/
-static int ecryptfs_send_raw_message(unsigned int transport, u8 msg_type,
+static int ecryptfs_send_raw_message(u8 msg_type,
struct ecryptfs_daemon *daemon)
{
struct ecryptfs_msg_ctx *msg_ctx;
int rc;
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_send_netlink(NULL, 0, NULL, msg_type, 0,
- daemon->pid);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_send_message_locked(transport, NULL, 0, msg_type,
- &msg_ctx);
- if (rc) {
- printk(KERN_ERR "%s: Error whilst attempting to send "
- "message via procfs; rc = [%d]\n", __func__, rc);
- goto out;
- }
- /* Raw messages are logically context-free (e.g., no
- * reply is expected), so we set the state of the
- * ecryptfs_msg_ctx object to indicate that it should
- * be freed as soon as the transport sends out the message. */
- mutex_lock(&msg_ctx->mux);
- msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_NO_REPLY;
- mutex_unlock(&msg_ctx->mux);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
+ rc = ecryptfs_send_message_locked(NULL, 0, msg_type, &msg_ctx);
+ if (rc) {
+ printk(KERN_ERR "%s: Error whilst attempting to send "
+ "message to ecryptfsd; rc = [%d]\n", __func__, rc);
+ goto out;
}
+ /* Raw messages are logically context-free (e.g., no
+ * reply is expected), so we set the state of the
+ * ecryptfs_msg_ctx object to indicate that it should
+ * be freed as soon as the message is sent. */
+ mutex_lock(&msg_ctx->mux);
+ msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_NO_REPLY;
+ mutex_unlock(&msg_ctx->mux);
out:
return rc;
}
@@ -227,7 +213,6 @@ out:
/**
* ecryptfs_process_helo
- * @transport: The underlying transport (netlink, etc.)
* @euid: The user ID owner of the message
* @user_ns: The namespace in which @euid applies
* @pid: The process ID for the userspace program that sent the
@@ -239,8 +224,8 @@ out:
* Returns zero after adding a new daemon to the hash list;
* non-zero otherwise.
*/
-int ecryptfs_process_helo(unsigned int transport, uid_t euid,
- struct user_namespace *user_ns, struct pid *pid)
+int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
+ struct pid *pid)
{
struct ecryptfs_daemon *new_daemon;
struct ecryptfs_daemon *old_daemon;
@@ -252,8 +237,7 @@ int ecryptfs_process_helo(unsigned int transport, uid_t euid,
printk(KERN_WARNING "Received request from user [%d] "
"to register daemon [0x%p]; unregistering daemon "
"[0x%p]\n", euid, pid, old_daemon->pid);
- rc = ecryptfs_send_raw_message(transport, ECRYPTFS_MSG_QUIT,
- old_daemon);
+ rc = ecryptfs_send_raw_message(ECRYPTFS_MSG_QUIT, old_daemon);
if (rc)
printk(KERN_WARNING "Failed to send QUIT "
"message to daemon [0x%p]; rc = [%d]\n",
@@ -467,8 +451,6 @@ out:
/**
* ecryptfs_send_message_locked
- * @transport: The transport over which to send the message (i.e.,
- * netlink)
* @data: The data to send
* @data_len: The length of data
* @msg_ctx: The message context allocated for the send
@@ -478,8 +460,8 @@ out:
* Returns zero on success; non-zero otherwise
*/
static int
-ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
- u8 msg_type, struct ecryptfs_msg_ctx **msg_ctx)
+ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
+ struct ecryptfs_msg_ctx **msg_ctx)
{
struct ecryptfs_daemon *daemon;
int rc;
@@ -503,20 +485,8 @@ ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
ecryptfs_msg_ctx_free_to_alloc(*msg_ctx);
mutex_unlock(&(*msg_ctx)->mux);
mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
- switch (transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_send_netlink(data, data_len, *msg_ctx, msg_type,
- 0, daemon->pid);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type,
- 0, daemon);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
- }
+ rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type, 0,
+ daemon);
if (rc)
printk(KERN_ERR "%s: Error attempting to send message to "
"userspace daemon; rc = [%d]\n", __func__, rc);
@@ -526,8 +496,6 @@ out:
/**
* ecryptfs_send_message
- * @transport: The transport over which to send the message (i.e.,
- * netlink)
* @data: The data to send
* @data_len: The length of data
* @msg_ctx: The message context allocated for the send
@@ -536,14 +504,14 @@ out:
*
* Returns zero on success; non-zero otherwise
*/
-int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
+int ecryptfs_send_message(char *data, int data_len,
struct ecryptfs_msg_ctx **msg_ctx)
{
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
- rc = ecryptfs_send_message_locked(transport, data, data_len,
- ECRYPTFS_MSG_REQUEST, msg_ctx);
+ rc = ecryptfs_send_message_locked(data, data_len, ECRYPTFS_MSG_REQUEST,
+ msg_ctx);
mutex_unlock(&ecryptfs_daemon_hash_mux);
return rc;
}
@@ -586,7 +554,7 @@ sleep:
return rc;
}
-int ecryptfs_init_messaging(unsigned int transport)
+int ecryptfs_init_messaging(void)
{
int i;
int rc = 0;
@@ -639,27 +607,14 @@ int ecryptfs_init_messaging(unsigned int transport)
mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
}
mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_init_netlink();
- if (rc)
- ecryptfs_release_messaging(transport);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_init_ecryptfs_miscdev();
- if (rc)
- ecryptfs_release_messaging(transport);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
- }
+ rc = ecryptfs_init_ecryptfs_miscdev();
+ if (rc)
+ ecryptfs_release_messaging();
out:
return rc;
}
-void ecryptfs_release_messaging(unsigned int transport)
+void ecryptfs_release_messaging(void)
{
if (ecryptfs_msg_ctx_arr) {
int i;
@@ -698,17 +653,6 @@ void ecryptfs_release_messaging(unsigned int transport)
kfree(ecryptfs_daemon_hash);
mutex_unlock(&ecryptfs_daemon_hash_mux);
}
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- ecryptfs_release_netlink();
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- ecryptfs_destroy_ecryptfs_miscdev();
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- break;
- }
+ ecryptfs_destroy_ecryptfs_miscdev();
return;
}
diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c
index 09a4522f65e..b484792a099 100644
--- a/fs/ecryptfs/miscdev.c
+++ b/fs/ecryptfs/miscdev.c
@@ -358,46 +358,6 @@ out_unlock_daemon:
}
/**
- * ecryptfs_miscdev_helo
- * @euid: effective user id of miscdevess sending helo packet
- * @user_ns: The namespace in which @euid applies
- * @pid: miscdevess id of miscdevess sending helo packet
- *
- * Returns zero on success; non-zero otherwise
- */
-static int ecryptfs_miscdev_helo(uid_t euid, struct user_namespace *user_ns,
- struct pid *pid)
-{
- int rc;
-
- rc = ecryptfs_process_helo(ECRYPTFS_TRANSPORT_MISCDEV, euid, user_ns,
- pid);
- if (rc)
- printk(KERN_WARNING "Error processing HELO; rc = [%d]\n", rc);
- return rc;
-}
-
-/**
- * ecryptfs_miscdev_quit
- * @euid: effective user id of miscdevess sending quit packet
- * @user_ns: The namespace in which @euid applies
- * @pid: miscdevess id of miscdevess sending quit packet
- *
- * Returns zero on success; non-zero otherwise
- */
-static int ecryptfs_miscdev_quit(uid_t euid, struct user_namespace *user_ns,
- struct pid *pid)
-{
- int rc;
-
- rc = ecryptfs_process_quit(euid, user_ns, pid);
- if (rc)
- printk(KERN_WARNING
- "Error processing QUIT message; rc = [%d]\n", rc);
- return rc;
-}
-
-/**
* ecryptfs_miscdev_response - miscdevess response to message previously sent to daemon
* @data: Bytes comprising struct ecryptfs_message
* @data_size: sizeof(struct ecryptfs_message) + data len
@@ -512,26 +472,7 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
__func__, rc);
break;
case ECRYPTFS_MSG_HELO:
- rc = ecryptfs_miscdev_helo(current->euid,
- current->nsproxy->user_ns,
- task_pid(current));
- if (rc) {
- printk(KERN_ERR "%s: Error attempting to process "
- "helo from pid [0x%p]; rc = [%d]\n", __func__,
- task_pid(current), rc);
- goto out_free;
- }
- break;
case ECRYPTFS_MSG_QUIT:
- rc = ecryptfs_miscdev_quit(current->euid,
- current->nsproxy->user_ns,
- task_pid(current));
- if (rc) {
- printk(KERN_ERR "%s: Error attempting to process "
- "quit from pid [0x%p]; rc = [%d]\n", __func__,
- task_pid(current), rc);
- goto out_free;
- }
break;
default:
ecryptfs_printk(KERN_WARNING, "Dropping miscdev "
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 2b6fe1e6e8b..04d7b3fa1ac 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -32,6 +32,7 @@
#include <linux/file.h>
#include <linux/crypto.h>
#include <linux/scatterlist.h>
+#include <asm/unaligned.h>
#include "ecryptfs_kernel.h"
/**
@@ -264,22 +265,34 @@ out:
}
/**
- * ecryptfs_prepare_write
+ * ecryptfs_write_begin
* @file: The eCryptfs file
- * @page: The eCryptfs page
- * @from: The start byte from which we will write
- * @to: The end byte to which we will write
+ * @mapping: The eCryptfs object
+ * @pos: The file offset at which to start writing
+ * @len: Length of the write
+ * @flags: Various flags
+ * @pagep: Pointer to return the page
+ * @fsdata: Pointer to return fs data (unused)
*
* This function must zero any hole we create
*
* Returns zero on success; non-zero otherwise
*/
-static int ecryptfs_prepare_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
+static int ecryptfs_write_begin(struct file *file,
+ struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
{
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+ struct page *page;
loff_t prev_page_end_size;
int rc = 0;
+ page = __grab_cache_page(mapping, index);
+ if (!page)
+ return -ENOMEM;
+ *pagep = page;
+
if (!PageUptodate(page)) {
struct ecryptfs_crypt_stat *crypt_stat =
&ecryptfs_inode_to_private(
@@ -288,8 +301,7 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)
|| (crypt_stat->flags & ECRYPTFS_NEW_FILE)) {
rc = ecryptfs_read_lower_page_segment(
- page, page->index, 0, PAGE_CACHE_SIZE,
- page->mapping->host);
+ page, index, 0, PAGE_CACHE_SIZE, mapping->host);
if (rc) {
printk(KERN_ERR "%s: Error attemping to read "
"lower page segment; rc = [%d]\n",
@@ -315,8 +327,8 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
SetPageUptodate(page);
} else {
rc = ecryptfs_read_lower_page_segment(
- page, page->index, 0, PAGE_CACHE_SIZE,
- page->mapping->host);
+ page, index, 0, PAGE_CACHE_SIZE,
+ mapping->host);
if (rc) {
printk(KERN_ERR "%s: Error reading "
"page; rc = [%d]\n",
@@ -338,10 +350,10 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
SetPageUptodate(page);
}
}
- prev_page_end_size = ((loff_t)page->index << PAGE_CACHE_SHIFT);
+ prev_page_end_size = ((loff_t)index << PAGE_CACHE_SHIFT);
/* If creating a page or more of holes, zero them out via truncate.
* Note, this will increase i_size. */
- if (page->index != 0) {
+ if (index != 0) {
if (prev_page_end_size > i_size_read(page->mapping->host)) {
rc = ecryptfs_truncate(file->f_path.dentry,
prev_page_end_size);
@@ -356,8 +368,8 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
}
/* Writing to a new page, and creating a small hole from start
* of page? Zero it out. */
- if ((i_size_read(page->mapping->host) == prev_page_end_size)
- && (from != 0))
+ if ((i_size_read(mapping->host) == prev_page_end_size)
+ && (pos != 0))
zero_user(page, 0, PAGE_CACHE_SIZE);
out:
return rc;
@@ -372,7 +384,6 @@ out:
*/
static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode)
{
- u64 file_size;
char *file_size_virt;
int rc;
@@ -381,9 +392,7 @@ static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode)
rc = -ENOMEM;
goto out;
}
- file_size = (u64)i_size_read(ecryptfs_inode);
- file_size = cpu_to_be64(file_size);
- memcpy(file_size_virt, &file_size, sizeof(u64));
+ put_unaligned_be64(i_size_read(ecryptfs_inode), file_size_virt);
rc = ecryptfs_write_lower(ecryptfs_inode, file_size_virt, 0,
sizeof(u64));
kfree(file_size_virt);
@@ -403,7 +412,6 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
struct dentry *lower_dentry =
ecryptfs_inode_to_private(ecryptfs_inode)->lower_file->f_dentry;
struct inode *lower_inode = lower_dentry->d_inode;
- u64 file_size;
int rc;
if (!lower_inode->i_op->getxattr || !lower_inode->i_op->setxattr) {
@@ -424,9 +432,7 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
xattr_virt, PAGE_CACHE_SIZE);
if (size < 0)
size = 8;
- file_size = (u64)i_size_read(ecryptfs_inode);
- file_size = cpu_to_be64(file_size);
- memcpy(xattr_virt, &file_size, sizeof(u64));
+ put_unaligned_be64(i_size_read(ecryptfs_inode), xattr_virt);
rc = lower_inode->i_op->setxattr(lower_dentry, ECRYPTFS_XATTR_NAME,
xattr_virt, size, 0);
mutex_unlock(&lower_inode->i_mutex);
@@ -450,21 +456,28 @@ int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode)
}
/**
- * ecryptfs_commit_write
+ * ecryptfs_write_end
* @file: The eCryptfs file object
+ * @mapping: The eCryptfs object
+ * @pos: The file position
+ * @len: The length of the data (unused)
+ * @copied: The amount of data copied
* @page: The eCryptfs page
- * @from: Ignored (we rotate the page IV on each write)
- * @to: Ignored
+ * @fsdata: The fsdata (unused)
*
* This is where we encrypt the data and pass the encrypted data to
* the lower filesystem. In OpenPGP-compatible mode, we operate on
* entire underlying packets.
*/
-static int ecryptfs_commit_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
+static int ecryptfs_write_end(struct file *file,
+ struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
{
- loff_t pos;
- struct inode *ecryptfs_inode = page->mapping->host;
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+ unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+ unsigned to = from + copied;
+ struct inode *ecryptfs_inode = mapping->host;
struct ecryptfs_crypt_stat *crypt_stat =
&ecryptfs_inode_to_private(file->f_path.dentry->d_inode)->crypt_stat;
int rc;
@@ -476,25 +489,22 @@ static int ecryptfs_commit_write(struct file *file, struct page *page,
} else
ecryptfs_printk(KERN_DEBUG, "Not a new file\n");
ecryptfs_printk(KERN_DEBUG, "Calling fill_zeros_to_end_of_page"
- "(page w/ index = [0x%.16x], to = [%d])\n", page->index,
- to);
+ "(page w/ index = [0x%.16x], to = [%d])\n", index, to);
/* Fills in zeros if 'to' goes beyond inode size */
rc = fill_zeros_to_end_of_page(page, to);
if (rc) {
ecryptfs_printk(KERN_WARNING, "Error attempting to fill "
- "zeros in page with index = [0x%.16x]\n",
- page->index);
+ "zeros in page with index = [0x%.16x]\n", index);
goto out;
}
rc = ecryptfs_encrypt_page(page);
if (rc) {
ecryptfs_printk(KERN_WARNING, "Error encrypting page (upper "
- "index [0x%.16x])\n", page->index);
+ "index [0x%.16x])\n", index);
goto out;
}
- pos = (((loff_t)page->index) << PAGE_CACHE_SHIFT) + to;
- if (pos > i_size_read(ecryptfs_inode)) {
- i_size_write(ecryptfs_inode, pos);
+ if (pos + copied > i_size_read(ecryptfs_inode)) {
+ i_size_write(ecryptfs_inode, pos + copied);
ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
"[0x%.16x]\n", i_size_read(ecryptfs_inode));
}
@@ -502,7 +512,11 @@ static int ecryptfs_commit_write(struct file *file, struct page *page,
if (rc)
printk(KERN_ERR "Error writing inode size to metadata; "
"rc = [%d]\n", rc);
+ else
+ rc = copied;
out:
+ unlock_page(page);
+ page_cache_release(page);
return rc;
}
@@ -523,7 +537,7 @@ static sector_t ecryptfs_bmap(struct address_space *mapping, sector_t block)
struct address_space_operations ecryptfs_aops = {
.writepage = ecryptfs_writepage,
.readpage = ecryptfs_readpage,
- .prepare_write = ecryptfs_prepare_write,
- .commit_write = ecryptfs_commit_write,
+ .write_begin = ecryptfs_write_begin,
+ .write_end = ecryptfs_write_end,
.bmap = ecryptfs_bmap,
};
diff --git a/fs/ecryptfs/netlink.c b/fs/ecryptfs/netlink.c
deleted file mode 100644
index e0abad62b39..00000000000
--- a/fs/ecryptfs/netlink.c
+++ /dev/null
@@ -1,249 +0,0 @@
-/**
- * eCryptfs: Linux filesystem encryption layer
- *
- * Copyright (C) 2004-2006 International Business Machines Corp.
- * Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
- * Tyler Hicks <tyhicks@ou.edu>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version
- * 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
-
-#include <net/sock.h>
-#include <linux/hash.h>
-#include <linux/random.h>
-#include "ecryptfs_kernel.h"
-
-static struct sock *ecryptfs_nl_sock;
-
-/**
- * ecryptfs_send_netlink
- * @data: The data to include as the payload
- * @data_len: The byte count of the data
- * @msg_ctx: The netlink context that will be used to handle the
- * response message
- * @msg_type: The type of netlink message to send
- * @msg_flags: The flags to include in the netlink header
- * @daemon_pid: The process id of the daemon to send the message to
- *
- * Sends the data to the specified daemon pid and uses the netlink
- * context element to store the data needed for validation upon
- * receiving the response. The data and the netlink context can be
- * null if just sending a netlink header is sufficient. Returns zero
- * upon sending the message; non-zero upon error.
- */
-int ecryptfs_send_netlink(char *data, int data_len,
- struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
- u16 msg_flags, struct pid *daemon_pid)
-{
- struct sk_buff *skb;
- struct nlmsghdr *nlh;
- struct ecryptfs_message *msg;
- size_t payload_len;
- int rc;
-
- payload_len = ((data && data_len) ? (sizeof(*msg) + data_len) : 0);
- skb = alloc_skb(NLMSG_SPACE(payload_len), GFP_KERNEL);
- if (!skb) {
- rc = -ENOMEM;
- ecryptfs_printk(KERN_ERR, "Failed to allocate socket buffer\n");
- goto out;
- }
- nlh = NLMSG_PUT(skb, pid_nr(daemon_pid), msg_ctx ? msg_ctx->counter : 0,
- msg_type, payload_len);
- nlh->nlmsg_flags = msg_flags;
- if (msg_ctx && payload_len) {
- msg = (struct ecryptfs_message *)NLMSG_DATA(nlh);
- msg->index = msg_ctx->index;
- msg->data_len = data_len;
- memcpy(msg->data, data, data_len);
- }
- rc = netlink_unicast(ecryptfs_nl_sock, skb, pid_nr(daemon_pid), 0);
- if (rc < 0) {
- ecryptfs_printk(KERN_ERR, "Failed to send eCryptfs netlink "
- "message; rc = [%d]\n", rc);
- goto out;
- }
- rc = 0;
- goto out;
-nlmsg_failure:
- rc = -EMSGSIZE;
- kfree_skb(skb);
-out:
- return rc;
-}
-
-/**
- * ecryptfs_process_nl_reponse
- * @skb: The socket buffer containing the netlink message of state
- * RESPONSE
- *
- * Processes a response message after sending a operation request to
- * userspace. Attempts to assign the msg to a netlink context element
- * at the index specified in the msg. The sk_buff and nlmsghdr must
- * be validated before this function. Returns zero upon delivery to
- * desired context element; non-zero upon delivery failure or error.
- */
-static int ecryptfs_process_nl_response(struct sk_buff *skb)
-{
- struct nlmsghdr *nlh = nlmsg_hdr(skb);
- struct ecryptfs_message *msg = NLMSG_DATA(nlh);
- struct pid *pid;
- int rc;
-
- if (skb->len - NLMSG_HDRLEN - sizeof(*msg) != msg->data_len) {
- rc = -EINVAL;
- ecryptfs_printk(KERN_ERR, "Received netlink message with "
- "incorrectly specified data length\n");
- goto out;
- }
- pid = find_get_pid(NETLINK_CREDS(skb)->pid);
- rc = ecryptfs_process_response(msg, NETLINK_CREDS(skb)->uid, NULL,
- pid, nlh->nlmsg_seq);
- put_pid(pid);
- if (rc)
- printk(KERN_ERR
- "Error processing response message; rc = [%d]\n", rc);
-out:
- return rc;
-}
-
-/**
- * ecryptfs_process_nl_helo
- * @skb: The socket buffer containing the nlmsghdr in HELO state
- *
- * Gets uid and pid of the skb and adds the values to the daemon id
- * hash. Returns zero after adding a new daemon id to the hash list;
- * non-zero otherwise.
- */
-static int ecryptfs_process_nl_helo(struct sk_buff *skb)
-{
- struct pid *pid;
- int rc;
-
- pid = find_get_pid(NETLINK_CREDS(skb)->pid);
- rc = ecryptfs_process_helo(ECRYPTFS_TRANSPORT_NETLINK,
- NETLINK_CREDS(skb)->uid, NULL, pid);
- put_pid(pid);
- if (rc)
- printk(KERN_WARNING "Error processing HELO; rc = [%d]\n", rc);
- return rc;
-}
-
-/**
- * ecryptfs_process_nl_quit
- * @skb: The socket buffer containing the nlmsghdr in QUIT state
- *
- * Gets uid and pid of the skb and deletes the corresponding daemon
- * id, if it is the registered that is requesting the
- * deletion. Returns zero after deleting the desired daemon id;
- * non-zero otherwise.
- */
-static int ecryptfs_process_nl_quit(struct sk_buff *skb)
-{
- struct pid *pid;
- int rc;
-
- pid = find_get_pid(NETLINK_CREDS(skb)->pid);
- rc = ecryptfs_process_quit(NETLINK_CREDS(skb)->uid, NULL, pid);
- put_pid(pid);
- if (rc)
- printk(KERN_WARNING
- "Error processing QUIT message; rc = [%d]\n", rc);
- return rc;
-}
-
-/**
- * ecryptfs_receive_nl_message
- *
- * Callback function called by netlink system when a message arrives.
- * If the message looks to be valid, then an attempt is made to assign
- * it to its desired netlink context element and wake up the process
- * that is waiting for a response.
- */
-static void ecryptfs_receive_nl_message(struct sk_buff *skb)
-{
- struct nlmsghdr *nlh;
-
- nlh = nlmsg_hdr(skb);
- if (!NLMSG_OK(nlh, skb->len)) {
- ecryptfs_printk(KERN_ERR, "Received corrupt netlink "
- "message\n");
- goto free;
- }
- switch (nlh->nlmsg_type) {
- case ECRYPTFS_MSG_RESPONSE:
- if (ecryptfs_process_nl_response(skb)) {
- ecryptfs_printk(KERN_WARNING, "Failed to "
- "deliver netlink response to "
- "requesting operation\n");
- }
- break;
- case ECRYPTFS_MSG_HELO:
- if (ecryptfs_process_nl_helo(skb)) {
- ecryptfs_printk(KERN_WARNING, "Failed to "
- "fulfill HELO request\n");
- }
- break;
- case ECRYPTFS_MSG_QUIT:
- if (ecryptfs_process_nl_quit(skb)) {
- ecryptfs_printk(KERN_WARNING, "Failed to "
- "fulfill QUIT request\n");
- }
- break;
- default:
- ecryptfs_printk(KERN_WARNING, "Dropping netlink "
- "message of unrecognized type [%d]\n",
- nlh->nlmsg_type);
- break;
- }
-free:
- kfree_skb(skb);
-}
-
-/**
- * ecryptfs_init_netlink
- *
- * Initializes the daemon id hash list, netlink context array, and
- * necessary locks. Returns zero upon success; non-zero upon error.
- */
-int ecryptfs_init_netlink(void)
-{
- int rc;
-
- ecryptfs_nl_sock = netlink_kernel_create(&init_net, NETLINK_ECRYPTFS, 0,
- ecryptfs_receive_nl_message,
- NULL, THIS_MODULE);
- if (!ecryptfs_nl_sock) {
- rc = -EIO;
- ecryptfs_printk(KERN_ERR, "Failed to create netlink socket\n");
- goto out;
- }
- ecryptfs_nl_sock->sk_sndtimeo = ECRYPTFS_DEFAULT_SEND_TIMEOUT;
- rc = 0;
-out:
- return rc;
-}
-
-/**
- * ecryptfs_release_netlink
- *
- * Frees all memory used by the netlink context array and releases the
- * netlink socket.
- */
-void ecryptfs_release_netlink(void)
-{
- netlink_kernel_release(ecryptfs_nl_sock);
- ecryptfs_nl_sock = NULL;
-}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-02-04 17:10:58 +0000