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eCryptfs: Use entire helper page during page crypto operations

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When encrypting eCryptfs pages and decrypting pages from the lower
filesystem, utilize the entire helper page rather than only the first
4096 bytes.

This only affects architectures where PAGE_CACHE_SIZE is larger than
4096 bytes.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
This commit is contained in:
Tyler Hicks 2013-04-16 23:21:24 -07:00
parent fc8b14d338
commit 12003e5b18
1 changed files with 16 additions and 13 deletions
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29
fs/ecryptfs/crypto.c
View File

@ -450,10 +450,11 @@ static int ecryptfs_encrypt_extent(struct page *enc_extent_page,
(unsigned long long)(extent_base + extent_offset), rc);
goto out;
}
rc = ecryptfs_encrypt_page_offset(crypt_stat, enc_extent_page, 0,
page, (extent_offset
* crypt_stat->extent_size),
crypt_stat->extent_size, extent_iv);
rc = ecryptfs_encrypt_page_offset(crypt_stat, enc_extent_page,
extent_offset * crypt_stat->extent_size,
page,
extent_offset * crypt_stat->extent_size,
crypt_stat->extent_size, extent_iv);
if (rc < 0) {
printk(KERN_ERR "%s: Error attempting to encrypt page with "
"page->index = [%ld], extent_offset = [%ld]; "
@ -520,8 +521,9 @@ int ecryptfs_encrypt_page(struct page *page)
* (PAGE_CACHE_SIZE
/ crypt_stat->extent_size))
+ extent_offset), crypt_stat);
rc = ecryptfs_write_lower(ecryptfs_inode, enc_extent_virt,
offset, crypt_stat->extent_size);
rc = ecryptfs_write_lower(ecryptfs_inode, (enc_extent_virt +
extent_offset * crypt_stat->extent_size),
offset, crypt_stat->extent_size);
if (rc < 0) {
ecryptfs_printk(KERN_ERR, "Error attempting "
"to write lower page; rc = [%d]"
@ -558,10 +560,10 @@ static int ecryptfs_decrypt_extent(struct page *page,
goto out;
}
rc = ecryptfs_decrypt_page_offset(crypt_stat, page,
(extent_offset
* crypt_stat->extent_size),
enc_extent_page, 0,
crypt_stat->extent_size, extent_iv);
extent_offset * crypt_stat->extent_size,
enc_extent_page,
extent_offset * crypt_stat->extent_size,
crypt_stat->extent_size, extent_iv);
if (rc < 0) {
printk(KERN_ERR "%s: Error attempting to decrypt to page with "
"page->index = [%ld], extent_offset = [%ld]; "
@ -620,9 +622,10 @@ int ecryptfs_decrypt_page(struct page *page)
&offset, ((page->index * (PAGE_CACHE_SIZE
/ crypt_stat->extent_size))
+ extent_offset), crypt_stat);
rc = ecryptfs_read_lower(enc_extent_virt, offset,
crypt_stat->extent_size,
ecryptfs_inode);
rc = ecryptfs_read_lower((enc_extent_virt +
extent_offset * crypt_stat->extent_size),
offset, crypt_stat->extent_size,
ecryptfs_inode);
if (rc < 0) {
ecryptfs_printk(KERN_ERR, "Error attempting "
"to read lower page; rc = [%d]"