Print a warning when overlayfs copies up a file if the process that triggered
the copy up has a R/O fd open to the lower file being copied up.
This can help catch applications that do things like the following:
fd1 = open("foo", O_RDONLY);
fd2 = open("foo", O_RDWR);
where they expect fd1 and fd2 to refer to the same file - which will no longer
be the case post-copy up.
With this patch, the following commands:
bash 5</mnt/a/foo128
6<>/mnt/a/foo128
assuming /mnt/a/foo128 to be an un-copied up file on an overlay will produce
the following warning in the kernel log:
overlayfs: Copying up foo129, but open R/O on fd 5 which will cease to
be coherent [pid=3818 bash]
This is enabled by setting:
/sys/module/overlay/parameters/check_copy_up
to 1.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 24f640441bd9..04f6f75ba4a9 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -7,6 +7,7 @@
* the Free Software Foundation.
*/
+#include <linux/module.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/file.h>
@@ -16,10 +17,40 @@
#include <linux/uaccess.h>
#include <linux/sched.h>
#include <linux/namei.h>
+#include <linux/fdtable.h>
#include "overlayfs.h"
#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)
+static bool __read_mostly ovl_check_copy_up;
+module_param_named(check_copy_up, ovl_check_copy_up, bool,
+ S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(ovl_check_copy_up,
+ "Warn on copy-up when causing process also has a R/O fd open");
+
+static int ovl_check_fd(const void *data, struct file *f, unsigned fd)
+{
+ const struct dentry *dentry = data;
+
+ if (f->f_path.dentry == dentry)
+ pr_warn("overlayfs: Warning: Copying up %pD, but open R/O on fd %u which will cease to be coherent [pid=%d %s]\n",
+ f, fd, current->pid, current->comm);
+ return 0;
+}
+
+/*
+ * Check the fds open by this process and warn if something like the following
+ * scenario is about to occur:
+ *
+ * fd1 = open("foo", O_RDONLY);
+ * fd2 = open("foo", O_RDWR);
+ */
+static void ovl_do_check_copy_up(struct dentry *dentry)
+{
+ if (ovl_check_copy_up)
+ iterate_fd(current->files, 0, ovl_check_fd, dentry);
+}
+
int ovl_copy_xattr(struct dentry *old, struct dentry *new)
{
ssize_t list_size, size;
@@ -299,6 +330,8 @@ int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
struct cred *override_cred;
char *link = NULL;
+ ovl_do_check_copy_up(lowerpath->dentry);
+
ovl_path_upper(parent, &parentpath);
upperdir = parentpath.dentry;
--
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