Commit 3b73bcf3 authored by Sasha Levin's avatar Sasha Levin Committed by Luis Henriques

vfs: read file_handle only once in handle_to_path

commit 161f873b upstream.

We used to read file_handle twice.  Once to get the amount of extra
bytes, and once to fetch the entire structure.

This may be problematic since we do size verifications only after the
first read, so if the number of extra bytes changes in userspace between
the first and second calls, we'll have an incoherent view of
file_handle.

Instead, read the constant size once, and copy that over to the final
structure without having to re-read it again.
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 2f2c08d6
...@@ -195,8 +195,9 @@ static int handle_to_path(int mountdirfd, struct file_handle __user *ufh, ...@@ -195,8 +195,9 @@ static int handle_to_path(int mountdirfd, struct file_handle __user *ufh,
goto out_err; goto out_err;
} }
/* copy the full handle */ /* copy the full handle */
if (copy_from_user(handle, ufh, *handle = f_handle;
sizeof(struct file_handle) + if (copy_from_user(&handle->f_handle,
&ufh->f_handle,
f_handle.handle_bytes)) { f_handle.handle_bytes)) {
retval = -EFAULT; retval = -EFAULT;
goto out_handle; goto out_handle;
......
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