On Wed, Feb 24, 2021 at 01:58:25PM +0800, Jindong Yue 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 Clang's
> Control-Flow Integrity checking violation, which verifies that the
> callback function's types match the prototypes exactly before jumping.
>
> [ 7.275750] Kernel panic - not syncing: CFI failure (target: rproc_handle_vdev+0x0/0x4)
> [ 7.283763] CPU: 2 PID: 1 Comm: init Tainted: G C O 5.4.70-03301-g527af2c96672 #17
> [ 7.292463] Hardware name: NXP i.MX8MPlus EVK board (DT)
> [ 7.297779] Call trace:
> [ 7.300232] dump_backtrace.cfi_jt+0x0/0x4
> [ 7.304337] show_stack+0x18/0x24
> [ 7.307660] dump_stack+0xb8/0x114
> [ 7.311069] panic+0x164/0x3d4
> [ 7.314130] __ubsan_handle_cfi_check_fail_abort+0x0/0x14
> [ 7.319533] perf_proc_update_handler+0x0/0xcc
> [ 7.323983] __cfi_check+0x63278/0x6a290
> [ 7.327913] rproc_boot+0x3f8/0x738
> [ 7.331404] rproc_add+0x68/0x110
> [ 7.334738] imx_rproc_probe+0x5e4/0x708 [imx_rproc]
> [ 7.339711] platform_drv_probe+0xac/0xf0
> [ 7.343726] really_probe+0x260/0x65c
> [ 7.347393] driver_probe_device+0x64/0x100
> [ 7.351580] device_driver_attach+0x6c/0xac
> [ 7.355766] __driver_attach+0xdc/0x184
> [ 7.359609] bus_for_each_dev+0x98/0x104
> [ 7.363537] driver_attach+0x24/0x30
> [ 7.367117] bus_add_driver+0x100/0x1e0
> [ 7.370958] driver_register+0x78/0x114
> [ 7.374800] __platform_driver_register+0x44/0x50
> [ 7.379514] init_module+0x20/0xfe8 [imx_rproc]
> [ 7.384049] do_one_initcall+0x190/0x348
> [ 7.387979] do_init_module+0x5c/0x210
> [ 7.391731] load_module+0x2fbc/0x3590
> [ 7.395485] __arm64_sys_finit_module+0xb8/0xec
> [ 7.400025] el0_svc_common+0xb4/0x19c
> [ 7.403777] el0_svc_handler+0x74/0x98
> [ 7.407531] el0_svc+0x8/0xc
> [ 7.410419] SMP: stopping secondary CPUs
> [ 7.414648] Kernel Offset: disabled
> [ 7.418142] CPU features: 0x00010002,2000200c
> [ 7.422501] Memory Limit: none
>
> 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 <[email protected]>
> Reviewed-by: Peng Fan <[email protected]>
> Reviewed-by: Sami Tolvanen <[email protected]>
Reviewed-by: Mathieu Poirier <[email protected]>
> ---
> drivers/remoteproc/remoteproc_core.c | 29 +++++++++++++++-------------
> 1 file changed, 16 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index ab150765d124..553e42a4d2a0 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -482,7 +482,7 @@ static int copy_dma_range_map(struct device *to, struct device *from)
> /**
> * rproc_handle_vdev() - handle a vdev fw resource
> * @rproc: the remote processor
> - * @rsc: the vring resource descriptor
> + * @ptr: the vring resource descriptor
> * @offset: offset of the resource entry
> * @avail: size of available data (for sanity checking the image)
> *
> @@ -507,9 +507,10 @@ static int copy_dma_range_map(struct device *to, struct device *from)
> *
> * Returns 0 on success, or an appropriate error code otherwise
> */
> -static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
> +static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
> int offset, int avail)
> {
> + struct fw_rsc_vdev *rsc = ptr;
> struct device *dev = &rproc->dev;
> struct rproc_vdev *rvdev;
> int i, ret;
> @@ -627,7 +628,7 @@ void rproc_vdev_release(struct kref *ref)
> /**
> * rproc_handle_trace() - handle a shared trace buffer resource
> * @rproc: the remote processor
> - * @rsc: the trace resource descriptor
> + * @ptr: the trace resource descriptor
> * @offset: offset of the resource entry
> * @avail: size of available data (for sanity checking the image)
> *
> @@ -641,9 +642,10 @@ void rproc_vdev_release(struct kref *ref)
> *
> * Returns 0 on success, or an appropriate error code otherwise
> */
> -static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
> +static int rproc_handle_trace(struct rproc *rproc, void *ptr,
> int offset, int avail)
> {
> + struct fw_rsc_trace *rsc = ptr;
> struct rproc_debug_trace *trace;
> struct device *dev = &rproc->dev;
> char name[15];
> @@ -693,7 +695,7 @@ static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
> /**
> * rproc_handle_devmem() - handle devmem resource entry
> * @rproc: remote processor handle
> - * @rsc: the devmem resource entry
> + * @ptr: the devmem resource entry
> * @offset: offset of the resource entry
> * @avail: size of available data (for sanity checking the image)
> *
> @@ -716,9 +718,10 @@ static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
> * and not allow firmwares to request access to physical addresses that
> * are outside those ranges.
> */
> -static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc,
> +static int rproc_handle_devmem(struct rproc *rproc, void *ptr,
> int offset, int avail)
> {
> + struct fw_rsc_devmem *rsc = ptr;
> struct rproc_mem_entry *mapping;
> struct device *dev = &rproc->dev;
> int ret;
> @@ -896,7 +899,7 @@ static int rproc_release_carveout(struct rproc *rproc,
> /**
> * rproc_handle_carveout() - handle phys contig memory allocation requests
> * @rproc: rproc handle
> - * @rsc: the resource entry
> + * @ptr: the resource entry
> * @offset: offset of the resource entry
> * @avail: size of available data (for image validation)
> *
> @@ -913,9 +916,9 @@ static int rproc_release_carveout(struct rproc *rproc,
> * pressure is important; it may have a substantial impact on performance.
> */
> static int rproc_handle_carveout(struct rproc *rproc,
> - struct fw_rsc_carveout *rsc,
> - int offset, int avail)
> + void *ptr, int offset, int avail)
> {
> + struct fw_rsc_carveout *rsc = ptr;
> struct rproc_mem_entry *carveout;
> struct device *dev = &rproc->dev;
>
> @@ -1097,10 +1100,10 @@ EXPORT_SYMBOL(rproc_of_parse_firmware);
> * enum fw_resource_type.
> */
> static rproc_handle_resource_t rproc_loading_handlers[RSC_LAST] = {
> - [RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout,
> - [RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem,
> - [RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace,
> - [RSC_VDEV] = (rproc_handle_resource_t)rproc_handle_vdev,
> + [RSC_CARVEOUT] = rproc_handle_carveout,
> + [RSC_DEVMEM] = rproc_handle_devmem,
> + [RSC_TRACE] = rproc_handle_trace,
> + [RSC_VDEV] = rproc_handle_vdev,
> };
>
> /* handle firmware resource entries before booting the remote processor */
> --
> 2.17.1
>