Messages in this thread |  | | From | Sami Tolvanen <> | Date | Mon, 22 Feb 2021 14:46:14 -0800 | Subject | Re: [PATCH] remoteproc: core: Remove casting to rproc_handle_resource_t |
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Hi,
On Sun, Feb 21, 2021 at 11:18 PM Jindong Yue <jindong.yue@nxp.com> wrote: > > There are four different callback functions that are used for the > rproc_handle_resource_t callback that all have different second > parameter types. > > rproc_handle_vdev -> struct fw_rsc_vdev > rproc_handle_trace -> struct fw_rsc_trace > rproc_handle_devmem -> struct fw_rsc_devmem > rproc_handle_carveout -> struct fw_rsc_carveout > > These callbacks are cast to rproc_handle_resource_t so that there is no > error about incompatible pointer types. Unfortunately, this is a control > flow integrity violation, which verifies that the callback function's > types match the prototypes exactly before jumping.
Thank you for sending the patch! It might be worth noting that Clang's Control-Flow Integrity checking is currently used only in Android kernels, so while the type mismatches are real and should be fixed, they don't result in runtime errors without this feature.
> To fix this, change the second parameter of all functions to void * and > use a local variable with the correct type so that everything works > properly. With this, we can remove casting to rproc_handle_resource_t > for these functions. > > Signed-off-by: Jindong Yue <jindong.yue@nxp.com> > Reviewed-by: Peng Fan <peng.fan@nxp.com>
This looks correct to me. Please feel free to add:
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Sami
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