linux-kernel - Re: [PATCH 5/5] platform/x86/amd/hsmp: Constify 'struct bin

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Message-ID: <ae2a0dfd-1b84-4b3d-ae25-5f1992c2a71a@gmail.com>
Date: Thu, 2 Jan 2025 15:36:01 -0600
From: Carlos Bilbao <carlos.bilbao.osdev@...il.com>
To: Thomas Weißschuh <linux@...ssschuh.net>,
 Stuart Hayes <stuart.w.hayes@...il.com>, Hans de Goede
 <hdegoede@...hat.com>, Ilpo Järvinen
 <ilpo.jarvinen@...ux.intel.com>, "David E. Box"
 <david.e.box@...ux.intel.com>,
 Naveen Krishna Chatradhi <naveenkrishna.chatradhi@....com>
Cc: platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] platform/x86/amd/hsmp: Constify 'struct
 bin_attribute'

On 12/2/24 13:38, Thomas Weißschuh wrote:

> The sysfs core now allows instances of 'struct bin_attribute' to be
> moved into read-only memory. Make use of that to protect them against
> accidental or malicious modifications.
>
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
>  drivers/platform/x86/amd/hsmp/acpi.c | 12 ++++++------
>  drivers/platform/x86/amd/hsmp/plat.c | 12 ++++++------
>  2 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/platform/x86/amd/hsmp/acpi.c b/drivers/platform/x86/amd/hsmp/acpi.c
> index dd5b5773328a9aff376a389cbd0109cb8cf0e385..7d802bfe206c73a4570dcd3752faee853bb81485 100644
> --- a/drivers/platform/x86/amd/hsmp/acpi.c
> +++ b/drivers/platform/x86/amd/hsmp/acpi.c
> @@ -226,7 +226,7 @@ static int hsmp_parse_acpi_table(struct device *dev, u16 sock_ind)
>  }
>  
>  static ssize_t hsmp_metric_tbl_acpi_read(struct file *filp, struct kobject *kobj,
> -					 struct bin_attribute *bin_attr, char *buf,
> +					 const struct bin_attribute *bin_attr, char *buf,
>  					 loff_t off, size_t count)
>  {
>  	struct device *dev = container_of(kobj, struct device, kobj);
> @@ -285,19 +285,19 @@ static int init_acpi(struct device *dev)
>  	return ret;
>  }
>  
> -static struct bin_attribute  hsmp_metric_tbl_attr = {
> +static const struct bin_attribute  hsmp_metric_tbl_attr = {
>  	.attr = { .name = HSMP_METRICS_TABLE_NAME, .mode = 0444},
> -	.read = hsmp_metric_tbl_acpi_read,
> +	.read_new = hsmp_metric_tbl_acpi_read,
>  	.size = sizeof(struct hsmp_metric_table),
>  };
>  
> -static struct bin_attribute *hsmp_attr_list[] = {
> +static const struct bin_attribute *hsmp_attr_list[] = {
>  	&hsmp_metric_tbl_attr,
>  	NULL
>  };
>  
> -static struct attribute_group hsmp_attr_grp = {
> -	.bin_attrs = hsmp_attr_list,
> +static const struct attribute_group hsmp_attr_grp = {
> +	.bin_attrs_new = hsmp_attr_list,
>  	.is_bin_visible = hsmp_is_sock_attr_visible,
>  };
>  
> diff --git a/drivers/platform/x86/amd/hsmp/plat.c b/drivers/platform/x86/amd/hsmp/plat.c
> index 748bbc35648474370275a80daf2c26e5d732f6ad..1fdcd65d398e6ceca154b804074cbba083f4b7f1 100644
> --- a/drivers/platform/x86/amd/hsmp/plat.c
> +++ b/drivers/platform/x86/amd/hsmp/plat.c
> @@ -59,7 +59,7 @@ static int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset,
>  }
>  
>  static ssize_t hsmp_metric_tbl_plat_read(struct file *filp, struct kobject *kobj,
> -					 struct bin_attribute *bin_attr, char *buf,
> +					 const struct bin_attribute *bin_attr, char *buf,
>  					 loff_t off, size_t count)
>  {
>  	struct hsmp_socket *sock;
> @@ -97,13 +97,13 @@ static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
>   * is_bin_visible function is used to show / hide the necessary groups.
>   */
>  #define HSMP_BIN_ATTR(index, _list)					\
> -static struct bin_attribute attr##index = {				\
> +static const struct bin_attribute attr##index = {			\
>  	.attr = { .name = HSMP_METRICS_TABLE_NAME, .mode = 0444},	\
>  	.private = (void *)index,					\
> -	.read = hsmp_metric_tbl_plat_read,					\
> +	.read_new = hsmp_metric_tbl_plat_read,				\
>  	.size = sizeof(struct hsmp_metric_table),			\
>  };									\
> -static struct bin_attribute _list[] = {					\
> +static const struct bin_attribute _list[] = {				\
>  	&attr##index,							\
>  	NULL								\
>  }
> @@ -118,8 +118,8 @@ HSMP_BIN_ATTR(6, *sock6_attr_list);
>  HSMP_BIN_ATTR(7, *sock7_attr_list);
>  
>  #define HSMP_BIN_ATTR_GRP(index, _list, _name)			\
> -static struct attribute_group sock##index##_attr_grp = {	\
> -	.bin_attrs = _list,					\
> +static const struct attribute_group sock##index##_attr_grp = {	\
> +	.bin_attrs_new = _list,					\
>  	.is_bin_visible = hsmp_is_sock_attr_visible,		\
>  	.name = #_name,						\
>  }


Acked-by: Carlos Bilbao <carlos.bilbao.osdev@...il.com>


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