diff options
| author | Matthew Daley <mattd@bugfuzz.com> | 2014-04-28 19:05:21 +1200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-05-05 07:46:56 -0700 |
| commit | 2145e15e0557a01b9195d1c7199a1b92cb9be81f (patch) | |
| tree | 5c9f4d9d23feb63d2a1eef1ec56a4f1138c973d8 | |
| parent | ef87dbe7614341c2e7bfe8d32fcb7028cc97442c (diff) | |
floppy: don't write kernel-only members to FDRAWCMD ioctl output
Do not leak kernel-only floppy_raw_cmd structure members to userspace.
This includes the linked-list pointer and the pointer to the allocated
DMA space.
Signed-off-by: Matthew Daley <mattd@bugfuzz.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/block/floppy.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index 12251a68887..fa9bb742df6 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -3067,7 +3067,10 @@ static int raw_cmd_copyout(int cmd, void __user *param, int ret; while (ptr) { - ret = copy_to_user(param, ptr, sizeof(*ptr)); + struct floppy_raw_cmd cmd = *ptr; + cmd.next = NULL; + cmd.kernel_data = NULL; + ret = copy_to_user(param, &cmd, sizeof(cmd)); if (ret) return -EFAULT; param += sizeof(struct floppy_raw_cmd); |