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-rw-r--r--fs/ecryptfs/crypto.c15
-rw-r--r--fs/ecryptfs/ecryptfs_kernel.h7
-rw-r--r--fs/ecryptfs/file.c13
-rw-r--r--fs/ecryptfs/inode.c15
-rw-r--r--fs/ecryptfs/mmap.c74
5 files changed, 113 insertions, 11 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 96fa40a48b4..44c2ec2e9e6 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1256,9 +1256,10 @@ out:
}
-static void
-write_header_metadata(char *virt, struct ecryptfs_crypt_stat *crypt_stat,
- size_t *written)
+void
+ecryptfs_write_header_metadata(char *virt,
+ struct ecryptfs_crypt_stat *crypt_stat,
+ size_t *written)
{
u32 header_extent_size;
u16 num_header_extents_at_front;
@@ -1320,7 +1321,8 @@ static int ecryptfs_write_headers_virt(char *page_virt, size_t *size,
offset += written;
write_ecryptfs_flags((page_virt + offset), crypt_stat, &written);
offset += written;
- write_header_metadata((page_virt + offset), crypt_stat, &written);
+ ecryptfs_write_header_metadata((page_virt + offset), crypt_stat,
+ &written);
offset += written;
rc = ecryptfs_generate_key_packet_set((page_virt + offset), crypt_stat,
ecryptfs_dentry, &written,
@@ -1606,7 +1608,12 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry,
ssize_t bytes_read;
struct ecryptfs_crypt_stat *crypt_stat =
&ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
+ struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
+ &ecryptfs_superblock_to_private(
+ ecryptfs_dentry->d_sb)->mount_crypt_stat;
+ ecryptfs_copy_mount_wide_flags_to_inode_flags(crypt_stat,
+ mount_crypt_stat);
/* Read the first page from the underlying file */
page_virt = kmem_cache_alloc(ecryptfs_header_cache_1, GFP_USER);
if (!page_virt) {
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 020abcd16f0..ec526df4235 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -559,7 +559,7 @@ ssize_t ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
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 dentry *ecryptfs_dentry);
int ecryptfs_process_helo(unsigned int transport, uid_t uid, pid_t pid);
int ecryptfs_process_quit(uid_t uid, pid_t pid);
int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t uid,
@@ -582,6 +582,9 @@ int ecryptfs_send_connector(char *data, int data_len,
u16 msg_flags, pid_t 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,
+ size_t *written);
#endif /* #ifndef ECRYPTFS_KERNEL_H */
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index f22c3a73485..652ed772a9b 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -250,6 +250,17 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
struct ecryptfs_file_info *file_info;
int lower_flags;
+ mount_crypt_stat = &ecryptfs_superblock_to_private(
+ ecryptfs_dentry->d_sb)->mount_crypt_stat;
+ if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
+ && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR)
+ || (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC)
+ || (file->f_flags & O_APPEND))) {
+ printk(KERN_WARNING "Mount has encrypted view enabled; "
+ "files may only be read\n");
+ rc = -EPERM;
+ goto out;
+ }
/* Released in ecryptfs_release or end of function if failure */
file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
ecryptfs_set_file_private(file, file_info);
@@ -261,8 +272,6 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
}
lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
- mount_crypt_stat = &ecryptfs_superblock_to_private(
- ecryptfs_dentry->d_sb)->mount_crypt_stat;
mutex_lock(&crypt_stat->cs_mutex);
if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED)) {
ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 6b45b2908f1..bbc1b4f666f 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -289,6 +289,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
char *encoded_name;
unsigned int encoded_namelen;
struct ecryptfs_crypt_stat *crypt_stat = NULL;
+ struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
char *page_virt = NULL;
struct inode *lower_inode;
u64 file_size;
@@ -388,8 +389,18 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
}
crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
}
- memcpy(&file_size, page_virt, sizeof(file_size));
- file_size = be64_to_cpu(file_size);
+ mount_crypt_stat = &ecryptfs_superblock_to_private(
+ dentry->d_sb)->mount_crypt_stat;
+ if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
+ if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
+ file_size = (crypt_stat->header_extent_size
+ + i_size_read(lower_dentry->d_inode));
+ 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);
+ }
i_size_write(dentry->d_inode, (loff_t)file_size);
kmem_cache_free(ecryptfs_header_cache_2, page_virt);
goto out;
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index ba3650d03c4..3386014becc 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -260,6 +260,33 @@ out:
ClearPageUptodate(page);
return rc;
}
+/**
+ * Header Extent:
+ * Octets 0-7: Unencrypted file size (big-endian)
+ * Octets 8-15: eCryptfs special marker
+ * Octets 16-19: Flags
+ * Octet 16: File format version number (between 0 and 255)
+ * Octets 17-18: Reserved
+ * Octet 19: Bit 1 (lsb): Reserved
+ * Bit 2: Encrypted?
+ * Bits 3-8: Reserved
+ * Octets 20-23: Header extent size (big-endian)
+ * Octets 24-25: Number of header extents at front of file
+ * (big-endian)
+ * Octet 26: Begin RFC 2440 authentication token packet set
+ */
+static void set_header_info(char *page_virt,
+ struct ecryptfs_crypt_stat *crypt_stat)
+{
+ size_t written;
+ int save_num_header_extents_at_front =
+ crypt_stat->num_header_extents_at_front;
+
+ crypt_stat->num_header_extents_at_front = 1;
+ ecryptfs_write_header_metadata(page_virt + 20, crypt_stat, &written);
+ crypt_stat->num_header_extents_at_front =
+ save_num_header_extents_at_front;
+}
/**
* ecryptfs_readpage
@@ -289,10 +316,55 @@ static int ecryptfs_readpage(struct file *file, struct page *page)
"[%d]\n", rc);
goto out;
}
+ } else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) {
+ if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
+ int num_pages_in_header_region =
+ (crypt_stat->header_extent_size
+ / PAGE_CACHE_SIZE);
+
+ if (page->index < num_pages_in_header_region) {
+ char *page_virt;
+
+ page_virt = (char *)kmap(page);
+ if (!page_virt) {
+ rc = -ENOMEM;
+ printk(KERN_ERR "Error mapping page\n");
+ goto out;
+ }
+ memset(page_virt, 0, PAGE_CACHE_SIZE);
+ if (page->index == 0) {
+ rc = ecryptfs_read_xattr_region(
+ page_virt, file->f_path.dentry);
+ set_header_info(page_virt, crypt_stat);
+ }
+ kunmap(page);
+ if (rc) {
+ printk(KERN_ERR "Error reading xattr "
+ "region\n");
+ goto out;
+ }
+ } else {
+ rc = ecryptfs_do_readpage(
+ file, page,
+ (page->index
+ - num_pages_in_header_region));
+ if (rc) {
+ printk(KERN_ERR "Error reading page; "
+ "rc = [%d]\n", rc);
+ goto out;
+ }
+ }
+ } else {
+ rc = ecryptfs_do_readpage(file, page, page->index);
+ if (rc) {
+ printk(KERN_ERR "Error reading page; rc = "
+ "[%d]\n", rc);
+ goto out;
+ }
+ }
} else {
rc = ecryptfs_decrypt_page(file, page);
if (rc) {
-
ecryptfs_printk(KERN_ERR, "Error decrypting page; "
"rc = [%d]\n", rc);
goto out;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-26 00:45:49 +0000