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authorBryan Schumaker <bjschuma@netapp.com>2011-03-23 15:04:31 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-03-23 15:14:27 -0400
commit8ef2ce3e16d9bec6cf015207c1c82a5b864046ac (patch)
tree35441fd695c4f5215ab0061d8df26b4cfd9a44f5 /fs/nfs
parent480c2006ebb44ae03165695db7b3e38c04e0d102 (diff)
NFS: Detect loops in a readdir due to bad cookies
Some filesystems (such as ext4) can return the same cookie value for multiple files. If we try to start a readdir with one of these cookies, the server will return the first file found with a cookie of the same value. This can cause the client to enter an infinite loop. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/dir.c28
1 files changed, 27 insertions, 1 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index cda73814f666..db87a7d1109b 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -139,7 +139,9 @@ static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct rpc_cred *
struct nfs_open_dir_context *ctx;
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (ctx != NULL) {
+ ctx->duped = 0;
ctx->dir_cookie = 0;
+ ctx->dup_cookie = 0;
ctx->cred = get_rpccred(cred);
} else
ctx = ERR_PTR(-ENOMEM);
@@ -321,6 +323,7 @@ int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descri
{
loff_t diff = desc->file->f_pos - desc->current_index;
unsigned int index;
+ struct nfs_open_dir_context *ctx = desc->file->private_data;
if (diff < 0)
goto out_eof;
@@ -333,6 +336,7 @@ int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descri
index = (unsigned int)diff;
*desc->dir_cookie = array->array[index].cookie;
desc->cache_entry_index = index;
+ ctx->duped = 0;
return 0;
out_eof:
desc->eof = 1;
@@ -343,11 +347,18 @@ static
int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
{
int i;
+ loff_t new_pos;
int status = -EAGAIN;
+ struct nfs_open_dir_context *ctx = desc->file->private_data;
for (i = 0; i < array->size; i++) {
if (array->array[i].cookie == *desc->dir_cookie) {
- desc->file->f_pos = desc->current_index + i;
+ new_pos = desc->current_index + i;
+ if (new_pos < desc->file->f_pos) {
+ ctx->dup_cookie = *desc->dir_cookie;
+ ctx->duped = 1;
+ }
+ desc->file->f_pos = new_pos;
desc->cache_entry_index = i;
return 0;
}
@@ -732,6 +743,20 @@ int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent,
int i = 0;
int res = 0;
struct nfs_cache_array *array = NULL;
+ struct nfs_open_dir_context *ctx = file->private_data;
+
+ if (ctx->duped != 0 && ctx->dup_cookie == *desc->dir_cookie) {
+ if (printk_ratelimit()) {
+ pr_notice("NFS: directory %s/%s contains a readdir loop. "
+ "Please contact your server vendor. "
+ "Offending cookie: %llu\n",
+ file->f_dentry->d_parent->d_name.name,
+ file->f_dentry->d_name.name,
+ *desc->dir_cookie);
+ }
+ res = -ELOOP;
+ goto out;
+ }
array = nfs_readdir_get_array(desc->page);
if (IS_ERR(array)) {
@@ -914,6 +939,7 @@ static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin)
if (offset != filp->f_pos) {
filp->f_pos = offset;
dir_ctx->dir_cookie = 0;
+ dir_ctx->duped = 0;
}
out:
mutex_unlock(&inode->i_mutex);