* [v4] media: platform: davinci: return -EINVAL for VPFE_CMD_S_CCDC_RAW_PARAMS ioctl
@ 2017-07-20 12:02 Lad, Prabhakar
0 siblings, 0 replies; only message in thread
From: Lad, Prabhakar @ 2017-07-20 12:02 UTC (permalink / raw)
To: LMML; +Cc: Arnd Bergmann, Sekhar Nori, Hans Verkuil
this patch makes sure VPFE_CMD_S_CCDC_RAW_PARAMS ioctl no longer works
for vpfe_capture driver with a minimal patch suitable for backporting.
- This ioctl was never in public api and was only defined in kernel header.
- The function set_params constantly mixes up pointers and phys_addr_t
numbers.
- This is part of a 'VPFE_CMD_S_CCDC_RAW_PARAMS' ioctl command that is
described as an 'experimental ioctl that will change in future kernels'.
- The code to allocate the table never gets called after we copy_from_user
the user input over the kernel settings, and then compare them
for inequality.
- We then go on to use an address provided by user space as both the
__user pointer for input and pass it through phys_to_virt to come up
with a kernel pointer to copy the data to. This looks like a trivially
exploitable root hole.
Due to these reasons we make sure this ioctl now returns -EINVAL and backport
this patch as far as possible.
Fixes: 5f15fbb68fd7 ("V4L/DVB (12251): v4l: dm644x ccdc module for vpfe capture driver")
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
---
drivers/media/platform/davinci/vpfe_capture.c | 22 ++--------------------
1 file changed, 2 insertions(+), 20 deletions(-)
diff --git a/drivers/media/platform/davinci/vpfe_capture.c b/drivers/media/platform/davinci/vpfe_capture.c
index e3fe3e0..1831bf5 100644
--- a/drivers/media/platform/davinci/vpfe_capture.c
+++ b/drivers/media/platform/davinci/vpfe_capture.c
@@ -1719,27 +1719,9 @@ static long vpfe_param_handler(struct file *file, void *priv,
switch (cmd) {
case VPFE_CMD_S_CCDC_RAW_PARAMS:
+ ret = -EINVAL;
v4l2_warn(&vpfe_dev->v4l2_dev,
- "VPFE_CMD_S_CCDC_RAW_PARAMS: experimental ioctl\n");
- if (ccdc_dev->hw_ops.set_params) {
- ret = ccdc_dev->hw_ops.set_params(param);
- if (ret) {
- v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
- "Error setting parameters in CCDC\n");
- goto unlock_out;
- }
- ret = vpfe_get_ccdc_image_format(vpfe_dev,
- &vpfe_dev->fmt);
- if (ret < 0) {
- v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
- "Invalid image format at CCDC\n");
- goto unlock_out;
- }
- } else {
- ret = -EINVAL;
- v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
- "VPFE_CMD_S_CCDC_RAW_PARAMS not supported\n");
- }
+ "VPFE_CMD_S_CCDC_RAW_PARAMS not supported\n");
break;
default:
ret = -ENOTTY;
--
2.7.4
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2017-07-20 12:02 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-07-20 12:02 [v4] media: platform: davinci: return -EINVAL for VPFE_CMD_S_CCDC_RAW_PARAMS ioctl Lad, Prabhakar
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).