ceph: properly zero data pages for file holes.

A bug is found in striped_read() of fs/ceph/file.c. striped_read() calls
ceph_zero_pape_vector_range().  The first argument, page_align + read + ret,
passed to ceph_zero_pape_vector_range() is wrong.

When a file has holes, this wrong parameter may cause memory corruption
either in kernal space or user space. Kernel space memory may be corrupted in
the case of non direct IO; user space memory may be corrupted in the case of
direct IO. In the latter case, the application doing direct IO may crash due
to memory corruption, as we have experienced.

The correct value should be initial_align + read + ret, where intial_align =
o_direct ? buf_align : io_align.  Compared with page_align, the current page
offest, initial_align is the initial page offest, which should be used to
calculate the page and offset in ceph_zero_pape_vector_range().

Reported-by: caifeng zhu <zhucaifeng@unissoft-nj.com>
Signed-off-by: Yan, Zheng <zyan@redhat.com>

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index ce74b394b49dd4affb91d2b23be4eb47915e9e75..663da44c06b6053e83bd7712622c798dfaf750c5 100644 (file)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -392,13 +392,14 @@ more:
        if (ret >= 0) {
                int didpages;
                if (was_short && (pos + ret < inode->i_size)) {
-                       u64 tmp = min(this_len - ret,
-                                       inode->i_size - pos - ret);
+                       int zlen = min(this_len - ret,
+                                      inode->i_size - pos - ret);
+                       int zoff = (o_direct ? buf_align : io_align) +
+                                   read + ret;
                        dout(" zero gap %llu to %llu\n",
-                               pos + ret, pos + ret + tmp);
-                       ceph_zero_page_vector_range(page_align + read + ret,
-                                                       tmp, pages);
-                       ret += tmp;
+                               pos + ret, pos + ret + zlen);
+                       ceph_zero_page_vector_range(zoff, zlen, pages);
+                       ret += zlen;
                }
 
                didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;