Re: [PATCH] platform/x86: dell-wmi-sysman: Make populate_foo_data functions more robust

From: Hans de Goede
Date: Mon May 10 2021 - 05:36:35 EST

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Hi,

On 4/27/21 6:22 AM, Prasanth KSR wrote:
> 1. Check acpi type before assignment of each property value
>
> 2. Add boundary check for properties count
>
> Co-developed-by: Divya Bharathi <divya.bharathi@xxxxxxxx>
> Signed-off-by: Divya Bharathi <divya.bharathi@xxxxxxxx>
> Signed-off-by: Prasanth KSR <prasanth.ksr@xxxxxxxx>

Thanks this mostly looks good, 2 small remarks inline below.

Once those are fixed this is ready for merging.

> ---
> .../dell/dell-wmi-sysman/dell-wmi-sysman.h | 5 ++-
> .../dell/dell-wmi-sysman/enum-attributes.c | 36 ++++++++++++++++---
> .../x86/dell/dell-wmi-sysman/int-attributes.c | 16 +++++++++
> .../dell/dell-wmi-sysman/passobj-attributes.c | 6 ++++
> .../dell/dell-wmi-sysman/string-attributes.c | 16 ++++++++-
> .../x86/dell/dell-wmi-sysman/sysman.c | 17 ++++++---
> 6 files changed, 84 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/dell-wmi-sysman.h b/drivers/platform/x86/dell/dell-wmi-sysman/dell-wmi-sysman.h
> index b80f2a62ea3f..3ad33a094588 100644
> --- a/drivers/platform/x86/dell/dell-wmi-sysman/dell-wmi-sysman.h
> +++ b/drivers/platform/x86/dell/dell-wmi-sysman/dell-wmi-sysman.h
> @@ -152,12 +152,15 @@ static ssize_t curr_val##_store(struct kobject *kobj, \
> return ret ? ret : count; \
> }
>
> +#define check_property_type(attr, prop, valuetype) \
> + (attr##_obj[prop].type != valuetype)
> +
> union acpi_object *get_wmiobj_pointer(int instance_id, const char *guid_string);
> int get_instance_count(const char *guid_string);
> void strlcpy_attr(char *dest, char *src);
>
> int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
> - struct kobject *attr_name_kobj);
> + struct kobject *attr_name_kobj, u32 enum_property_count);
> int alloc_enum_data(void);
> void exit_enum_attributes(void);
>
> diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c
> index 091e48c217ed..70f4ace56ec3 100644
> --- a/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c
> +++ b/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c
> @@ -132,39 +132,65 @@ int alloc_enum_data(void)
> * @enumeration_obj: ACPI object with enumeration data
> * @instance_id: The instance to enumerate
> * @attr_name_kobj: The parent kernel object
> + * @enum_property_count: Total properties count under enumeration type
> */
> int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
> - struct kobject *attr_name_kobj)
> + struct kobject *attr_name_kobj, u32 enum_property_count)
> {
> int i, next_obj, value_modifier_count, possible_values_count;
>
> wmi_priv.enumeration_data[instance_id].attr_name_kobj = attr_name_kobj;
> + if (check_property_type(enumeration, ATTR_NAME, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.enumeration_data[instance_id].attribute_name,
> enumeration_obj[ATTR_NAME].string.pointer);
> + if (check_property_type(enumeration, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name_language_code,
> enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer);
> + if (check_property_type(enumeration, DISPLAY_NAME, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name,
> enumeration_obj[DISPLAY_NAME].string.pointer);
> + if (check_property_type(enumeration, DEFAULT_VAL, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.enumeration_data[instance_id].default_value,
> enumeration_obj[DEFAULT_VAL].string.pointer);
> + if (check_property_type(enumeration, MODIFIER, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.enumeration_data[instance_id].dell_modifier,
> enumeration_obj[MODIFIER].string.pointer);
>
> next_obj = MODIFIER + 1;
>
> - value_modifier_count = (uintptr_t)enumeration_obj[next_obj].string.pointer;
> + if (next_obj >= enum_property_count)
> + return -EINVAL;
> +
> + if (check_property_type(enumeration, next_obj, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> + value_modifier_count = (uintptr_t)enumeration_obj[next_obj++].string.pointer;
>
> for (i = 0; i < value_modifier_count; i++) {
> + if (next_obj >= enum_property_count)
> + return -EINVAL;
> + if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING))
> + return -EINVAL;
> strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier,
> - enumeration_obj[++next_obj].string.pointer);
> + enumeration_obj[next_obj++].string.pointer);
> strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";");
> }
>
> - possible_values_count = (uintptr_t) enumeration_obj[++next_obj].string.pointer;

You are missing a:

if (next_obj >= enum_property_count)
return -EINVAL;

Check here.

> + if (check_property_type(enumeration, next_obj, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> + possible_values_count = (uintptr_t) enumeration_obj[next_obj++].string.pointer;
>
> for (i = 0; i < possible_values_count; i++) {
> + if (next_obj >= enum_property_count)
> + return -EINVAL;
> + if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING))
> + return -EINVAL;
> strcat(wmi_priv.enumeration_data[instance_id].possible_values,
> - enumeration_obj[++next_obj].string.pointer);
> + enumeration_obj[next_obj++].string.pointer);
> strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";");
> }
>
> diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
> index 8a49ba6e44f9..951e75b538fa 100644
> --- a/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
> +++ b/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
> @@ -141,20 +141,36 @@ int populate_int_data(union acpi_object *integer_obj, int instance_id,
> struct kobject *attr_name_kobj)
> {
> wmi_priv.integer_data[instance_id].attr_name_kobj = attr_name_kobj;
> + if (check_property_type(integer, ATTR_NAME, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name,
> integer_obj[ATTR_NAME].string.pointer);
> + if (check_property_type(integer, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code,
> integer_obj[DISPL_NAME_LANG_CODE].string.pointer);
> + if (check_property_type(integer, DISPLAY_NAME, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.integer_data[instance_id].display_name,
> integer_obj[DISPLAY_NAME].string.pointer);
> + if (check_property_type(integer, DEFAULT_VAL, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> wmi_priv.integer_data[instance_id].default_value =
> (uintptr_t)integer_obj[DEFAULT_VAL].string.pointer;
> + if (check_property_type(integer, MODIFIER, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier,
> integer_obj[MODIFIER].string.pointer);
> + if (check_property_type(integer, MIN_VALUE, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> wmi_priv.integer_data[instance_id].min_value =
> (uintptr_t)integer_obj[MIN_VALUE].string.pointer;
> + if (check_property_type(integer, MAX_VALUE, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> wmi_priv.integer_data[instance_id].max_value =
> (uintptr_t)integer_obj[MAX_VALUE].string.pointer;
> + if (check_property_type(integer, SCALAR_INCR, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> wmi_priv.integer_data[instance_id].scalar_increment =
> (uintptr_t)integer_obj[SCALAR_INCR].string.pointer;
>
> diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/passobj-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/passobj-attributes.c
> index 834b3e82ad9f..230e6ee96636 100644
> --- a/drivers/platform/x86/dell/dell-wmi-sysman/passobj-attributes.c
> +++ b/drivers/platform/x86/dell/dell-wmi-sysman/passobj-attributes.c
> @@ -159,10 +159,16 @@ int alloc_po_data(void)
> int populate_po_data(union acpi_object *po_obj, int instance_id, struct kobject *attr_name_kobj)
> {
> wmi_priv.po_data[instance_id].attr_name_kobj = attr_name_kobj;
> + if (check_property_type(po, ATTR_NAME, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.po_data[instance_id].attribute_name,
> po_obj[ATTR_NAME].string.pointer);
> + if (check_property_type(po, MIN_PASS_LEN, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> wmi_priv.po_data[instance_id].min_password_length =
> (uintptr_t)po_obj[MIN_PASS_LEN].string.pointer;
> + if (check_property_type(po, MAX_PASS_LEN, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> wmi_priv.po_data[instance_id].max_password_length =
> (uintptr_t) po_obj[MAX_PASS_LEN].string.pointer;
>
> diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/string-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/string-attributes.c
> index 552537852459..c392f0ecf8b5 100644
> --- a/drivers/platform/x86/dell/dell-wmi-sysman/string-attributes.c
> +++ b/drivers/platform/x86/dell/dell-wmi-sysman/string-attributes.c
> @@ -118,24 +118,38 @@ int alloc_str_data(void)
>
> /**
> * populate_str_data() - Populate all properties of an instance under string attribute
> - * @str_obj: ACPI object with integer data
> + * @str_obj: ACPI object with string data
> * @instance_id: The instance to enumerate
> * @attr_name_kobj: The parent kernel object
> */
> int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj)
> {
> wmi_priv.str_data[instance_id].attr_name_kobj = attr_name_kobj;
> + if (check_property_type(str, ATTR_NAME, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.str_data[instance_id].attribute_name,
> str_obj[ATTR_NAME].string.pointer);
> + if (check_property_type(str, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.str_data[instance_id].display_name_language_code,
> str_obj[DISPL_NAME_LANG_CODE].string.pointer);
> + if (check_property_type(str, DISPLAY_NAME, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.str_data[instance_id].display_name,
> str_obj[DISPLAY_NAME].string.pointer);
> + if (check_property_type(str, DEFAULT_VAL, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.str_data[instance_id].default_value,
> str_obj[DEFAULT_VAL].string.pointer);
> + if (check_property_type(str, MODIFIER, ACPI_TYPE_STRING))
> + return -EINVAL;
> strlcpy_attr(wmi_priv.str_data[instance_id].dell_modifier,
> str_obj[MODIFIER].string.pointer);
> + if (check_property_type(str, MIN_LEN, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> wmi_priv.str_data[instance_id].min_length = (uintptr_t)str_obj[MIN_LEN].string.pointer;
> + if (check_property_type(str, MAX_LEN, ACPI_TYPE_INTEGER))
> + return -EINVAL;
> wmi_priv.str_data[instance_id].max_length = (uintptr_t) str_obj[MAX_LEN].string.pointer;
>
> return sysfs_create_group(attr_name_kobj, &str_attr_group);
> diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c b/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
> index c8d276d78e92..5276e8c5aad5 100644
> --- a/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
> +++ b/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
> @@ -412,10 +412,16 @@ static int init_bios_attributes(int attr_type, const char *guid)
> return retval;
>
> switch (attr_type) {
> - case ENUM: min_elements = 8; break;
> - case INT: min_elements = 9; break;
> - case STR: min_elements = 8; break;
> - case PO: min_elements = 4; break;
> + case ENUM:
> + case STR:
> + min_elements = 8;
> + break;
> + case INT:
> + min_elements = 9;
> + break;
> + case PO:
> + min_elements = 4;
> + break;
> default:
> pr_err("Error: Unknown attr_type: %d\n", attr_type);
> return -EINVAL;

Please drop these unrelated changes. If you want to change this please submit a
separate patch for it, but I would prefer to keep this as is.

> @@ -481,7 +487,8 @@ static int init_bios_attributes(int attr_type, const char *guid)
> /* enumerate all of this attribute */
> switch (attr_type) {
> case ENUM:
> - retval = populate_enum_data(elements, instance_id, attr_name_kobj);
> + retval = populate_enum_data(elements, instance_id, attr_name_kobj,
> + obj->package.count);
> break;
> case INT:
> retval = populate_int_data(elements, instance_id, attr_name_kobj);
>

Regards,

Hans

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