UBUNTU: SAUCE: 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>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index eae484acfbbc1d4c8228b5524b4d30070793620a..0a860603a5b6c3380cff05174f24411ce80f5f35 100644 (file)
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3470,6 +3470,8 @@ 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;