On Tue, Jan 09, 2007 at 02:42:03PM -0800, Andrew Morton wrote:
> On Tue, 9 Jan 2007 16:23:37 -0600
> Michael Halcrow <[EMAIL PROTECTED]> wrote:
> > + set_header_info(page_virt, crypt_stat);
> > + }
>
> The kernel must always run flush_dcache_page() after modifying a pagecache
> page by hand. Please review all of ecryptfs for this.
Call flush_dcache_page() after modifying a pagecache by hand.
Signed-off-by: Michael Halcrow <[EMAIL PROTECTED]>
---
fs/ecryptfs/mmap.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
b77b1e2cbda1dfa6cc0925bca790701261771c43
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 2a7ba51..59ec097 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -238,7 +238,9 @@ int ecryptfs_do_readpage(struct file *fi
lower_page_data = (char *)kmap_atomic(lower_page, KM_USER1);
memcpy(page_data, lower_page_data, PAGE_CACHE_SIZE);
kunmap_atomic(lower_page_data, KM_USER1);
+ flush_dcache_page(lower_page);
kunmap_atomic(page_data, KM_USER0);
+ flush_dcache_page(page);
rc = 0;
out:
if (likely(lower_page))
@@ -322,6 +324,7 @@ static int ecryptfs_readpage(struct file
set_header_info(page_virt, crypt_stat);
}
kunmap_atomic(page_virt, KM_USER0);
+ flush_dcache_page(page);
if (rc) {
printk(KERN_ERR "Error reading xattr "
"region\n");
@@ -382,6 +385,7 @@ static int fill_zeros_to_end_of_page(str
memset((page_virt + end_byte_in_page), 0,
(PAGE_CACHE_SIZE - end_byte_in_page));
kunmap_atomic(page_virt, KM_USER0);
+ flush_dcache_page(page);
out:
return 0;
}
@@ -456,6 +460,7 @@ static int ecryptfs_write_inode_size_to_
header_virt = kmap_atomic(header_page, KM_USER0);
memcpy(header_virt, &file_size, sizeof(u64));
kunmap_atomic(header_virt, KM_USER0);
+ flush_dcache_page(header_page);
rc = lower_a_ops->commit_write(lower_file, header_page, 0, 8);
if (rc < 0)
ecryptfs_printk(KERN_ERR, "Error commiting header page "
@@ -742,6 +747,7 @@ int write_zeros(struct file *file, pgoff
tmp_page_virt = kmap_atomic(tmp_page, KM_USER0);
memset(((char *)tmp_page_virt + start), 0, num_zeros);
kunmap_atomic(tmp_page_virt, KM_USER0);
+ flush_dcache_page(tmp_page);
rc = ecryptfs_commit_write(file, tmp_page, start, start + num_zeros);
if (rc < 0) {
ecryptfs_printk(KERN_ERR, "Error attempting to write zero's "
--
1.3.3
-
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