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authorTyler Hicks <tyhicks@linux.vnet.ibm.com>2010-02-11 16:10:38 +0300
committerTyler Hicks <tyhicks@linux.vnet.ibm.com>2010-03-23 20:29:49 +0300
commit157f1071354db1aed885816094888e0e257c9d0a (patch)
tree711d00d7dce97f846342db0a27b4a61c6b1966a4 /fs/ecryptfs/mmap.c
parent220bf991b0366cc50a94feede3d7341fa5710ee4 (diff)
downloadlinux-157f1071354db1aed885816094888e0e257c9d0a.tar.xz
eCryptfs: Fix metadata in xattr feature regression
Fixes regression in 8faece5f906725c10e7a1f6caf84452abadbdc7b When using the ecryptfs_xattr_metadata mount option, eCryptfs stores the metadata (normally stored at the front of the file) in the user.ecryptfs xattr. This causes ecryptfs_crypt_stat.num_header_bytes_at_front to be 0, since there is no header data at the front of the file. This results in too much memory being requested and ENOMEM being returned from ecryptfs_write_metadata(). This patch fixes the problem by using the num_header_bytes_at_front variable for specifying the max size of the metadata, despite whether it is stored in the header or xattr. Reviewed-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Diffstat (limited to 'fs/ecryptfs/mmap.c')
-rw-r--r--fs/ecryptfs/mmap.c19
1 files changed, 5 insertions, 14 deletions
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index df4ce99d0597..5a30e01547f1 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -97,19 +97,6 @@ out:
* (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;
- size_t save_num_header_bytes_at_front =
- crypt_stat->num_header_bytes_at_front;
-
- crypt_stat->num_header_bytes_at_front =
- ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE;
- ecryptfs_write_header_metadata(page_virt + 20, crypt_stat, &written);
- crypt_stat->num_header_bytes_at_front =
- save_num_header_bytes_at_front;
-}
/**
* ecryptfs_copy_up_encrypted_with_header
@@ -146,9 +133,13 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page,
memset(page_virt, 0, PAGE_CACHE_SIZE);
/* TODO: Support more than one header extent */
if (view_extent_num == 0) {
+ size_t written;
+
rc = ecryptfs_read_xattr_region(
page_virt, page->mapping->host);
- set_header_info(page_virt, crypt_stat);
+ ecryptfs_write_header_metadata(page_virt + 20,
+ crypt_stat,
+ &written);
}
kunmap_atomic(page_virt, KM_USER0);
flush_dcache_page(page);