floppy: Do not copy a kernel pointer to user memory in FDGETPRM ioctl

The final field of a floppy_struct is the field "name", which is a pointer
to a string in kernel memory.  The kernel pointer should not be copied to
user memory.  The FDGETPRM ioctl copies a floppy_struct to user memory,
including this "name" field.  This pointer cannot be used by the user
and it will leak a kernel address to user-space, which will reveal the
location of kernel code and data and undermine KASLR protection.

Model this code after the compat ioctl which copies the returned data
to a previously cleared temporary structure on the stack (excluding the
name pointer) and copy out to userspace from there.  As we already have
an inparam union with an appropriate member and that memory is already
cleared even for read only calls make use of that as a temporary store.

Based on an initial patch by Brian Belleville.

CVE-2018-7755
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Broke up long line.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name floppy-Do-not-copy-a-kernel-pointer-to-user-memory-i.patch

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 8871b5044d9e4b0de6b8eb85ce6c7aaf33a3a4b6..7d7c698c0213988d60a2d175892f90c0377863e2 100644 (file)
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3470,6 +3470,9 @@ static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int
                                          (struct floppy_struct **)&outparam);
                if (ret)
                        return ret;
+               memcpy(&inparam.g, outparam,
+                               offsetof(struct floppy_struct, name));
+               outparam = &inparam.g;
                break;
        case FDMSGON:
                UDP->flags |= FTD_MSG;