From: Arnd Bergmann <arnd@arndb.de>
To: Dragan Cvetic <dragan.cvetic@xilinx.com>
Cc: gregkh <gregkh@linuxfoundation.org>,
Michal Simek <michal.simek@xilinx.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Derek Kiernan <derek.kiernan@xilinx.com>
Subject: Re: [PATCH 08/12] misc: xilinx_sdfec: Add ability to get/set config
Date: Tue, 19 Mar 2019 14:05:43 +0100 [thread overview]
Message-ID: <CAK8P3a0E_eZb1rSb9suv65n8WUnz-cXhk24aGoR8eNKcHVPtFw@mail.gmail.com> (raw)
In-Reply-To: <1552997064-432700-9-git-send-email-dragan.cvetic@xilinx.com>
On Tue, Mar 19, 2019 at 1:06 PM Dragan Cvetic <dragan.cvetic@xilinx.com> wrote:
> - Add capability to get SD-FEC config data using ioctl
> XSDFEC_GET_CONFIG.
>
> - Add capability to set SD-FEC data order using ioctl
> SDFEC_SET_ORDER. The order of data blocks can change
> from input to output or to be maintained.
Commenting here only on the ABI, not the actual behavior of the driver:
> +static int xsdfec_get_config(struct xsdfec_dev *xsdfec, void __user *arg)
> +{
> + int err;
> +
> + err = copy_to_user(arg, &xsdfec->config, sizeof(xsdfec->config));
> + if (err) {
> + dev_err(xsdfec->dev, "%s failed for SDFEC%d", __func__,
> + xsdfec->config.fec_id);
> + err = -EFAULT;
> + }
Try to avoid printing error messages for things that can be triggered from
user space.
> static int xsdfec_set_turbo(struct xsdfec_dev *xsdfec, void __user *arg)
> {
> struct xsdfec_turbo turbo;
> @@ -670,6 +683,67 @@ static int xsdfec_add_ldpc(struct xsdfec_dev *xsdfec, void __user *arg)
> return ret;
> }
>
> +static int xsdfec_set_order(struct xsdfec_dev *xsdfec, void __user *arg)
> +{
> + bool order_invalid;
> + enum xsdfec_order order = *((enum xsdfec_order *)arg);
Generally speaking, you should never cast between __user pointers
and kernel pointers. It looks like this will actually dereference a
__user pointer, which is a security issue.
Another problem is that the command is defined as
#define XSDFEC_SET_ORDER _IOW(XSDFEC_MAGIC, 8, unsigned long *)
which would indicate an argument of type 'unsigned long __user * __user *',
which is incompatible with 'enum xsdfec_order __user *'. Both enum
and pointer types are variable length and should be avoided in
ioctl commands. Best make this a '__u64 __user *' or '__u32 __user *'.
> + */
> +#define XSDFEC_GET_CONFIG _IOR(XSDFEC_MAGIC, 6, struct xsdfec_config *)
> +/**
> * DOC: XSDFEC_GET_TURBO
> * @Parameters
> *
> @@ -322,4 +335,48 @@ xsdfec_calculate_shared_ldpc_table_entry_size(struct xsdfec_ldpc_params *ldpc,
> * ioctl that returns SD-FEC turbo param values
> */
> #define XSDFEC_GET_TURBO _IOR(XSDFEC_MAGIC, 7, struct xsdfec_turbo *)
Also wrong type, the function takes a 'struct xsdfec_turbo __user *', not a
'struct xsdfec_turbo __user * __user *',
Arnd
next prev parent reply other threads:[~2019-03-19 13:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-19 12:04 [PATCH 00/12] misc: xilinx sd-fec driver Dragan Cvetic
2019-03-19 12:04 ` [PATCH 01/12] dt-bindings: xilinx-sdfec: Add SDFEC binding Dragan Cvetic
2019-03-19 12:04 ` [PATCH 02/12] misc: xilinx-sdfec: add core driver Dragan Cvetic
2019-03-19 12:04 ` [PATCH 03/12] misc: xilinx_sdfec: Add CCF support Dragan Cvetic
2019-03-19 12:04 ` [PATCH 04/12] misc: xilinx_sdfec: Add open, close and ioctl Dragan Cvetic
2019-03-19 13:17 ` Arnd Bergmann
2019-03-19 14:59 ` Dragan Cvetic
2019-03-19 15:36 ` Arnd Bergmann
2019-03-19 18:10 ` Dragan Cvetic
2019-03-19 19:46 ` Arnd Bergmann
2019-04-09 8:35 ` Dragan Cvetic
2019-03-19 12:04 ` [PATCH 05/12] misc: xilinx_sdfec: Store driver config and state Dragan Cvetic
2019-03-19 12:04 ` [PATCH 06/12] misc: xilinx_sdfec: Add ability to configure turbo mode Dragan Cvetic
2019-03-19 12:04 ` [PATCH 07/12] misc: xilinx_sdfec: Add ability to configure LDPC Dragan Cvetic
2019-03-19 12:04 ` [PATCH 08/12] misc: xilinx_sdfec: Add ability to get/set config Dragan Cvetic
2019-03-19 13:05 ` Arnd Bergmann [this message]
2019-03-19 14:02 ` Dragan Cvetic
2019-03-19 12:04 ` [PATCH 09/12] misc: xilinx_sdfec: Support poll file operation Dragan Cvetic
2019-03-19 12:04 ` [PATCH 10/12] misc: xilinx_sdfec: Add stats & status ioctls Dragan Cvetic
2019-03-19 12:04 ` [PATCH 11/12] Docs: misc: xilinx_sdfec: Add documentation Dragan Cvetic
2019-03-19 12:04 ` [PATCH 12/12] MAINTAINERS: add maintainer for SD-FEC support Dragan Cvetic
2019-03-19 12:17 ` [PATCH 00/12] misc: xilinx sd-fec driver Michal Simek
2019-03-19 13:44 ` Dragan Cvetic
2019-03-19 13:51 ` Michal Simek
2019-03-19 13:55 ` Dragan Cvetic
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