Commit e33655a3 authored by Matt Fleming's avatar Matt Fleming
Browse files

efivars: Add compatibility code for compat tasks 



It seems people are using 32-bit efibootmgr on top of 64-bit kernels,
which will currently fail horribly when using the efivars interface,
which is the traditional efibootmgr backend (the other being efivarfs).

Since there is no versioning info in the data structure, figure out when
we need to munge the structure data via judicious use of
is_compat_task().

Cc: Mike Waychison <mikew@google.com>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent 54d2fbfb

drivers/firmware/efi/efivars.c

+116 −26
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ 
#include <linux/module.h>

#include <linux/slab.h>

#include <linux/ucs2_string.h>

#include <linux/compat.h>



#define EFIVARS_VERSION "0.08"

#define EFIVARS_DATE "2004-May-17"
@@ -86,6 +87,15 @@ static struct kset *efivars_kset; 
static struct bin_attribute *efivars_new_var;

static struct bin_attribute *efivars_del_var;



struct compat_efi_variable {

	efi_char16_t  VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];

	efi_guid_t    VendorGuid;

	__u32         DataSize;

	__u8          Data[1024];

	__u32         Status;

	__u32         Attributes;

} __packed;



struct efivar_attribute {

	struct attribute attr;

	ssize_t (*show) (struct efivar_entry *entry, char *buf);
@@ -218,6 +228,25 @@ sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor, 
	return 0;

}



static inline bool is_compat(void)

{

	if (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())

		return true;



	return false;

}



static void

copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src)

{

	memcpy(dst->VariableName, src->VariableName, EFI_VAR_NAME_LEN);

	memcpy(dst->Data, src->Data, sizeof(src->Data));



	dst->VendorGuid = src->VendorGuid;

	dst->DataSize = src->DataSize;

	dst->Attributes = src->Attributes;

}



/*

 * We allow each variable to be edited via rewriting the

 * entire efi variable structure.
@@ -233,6 +262,25 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) 
	u8 *data;

	int err;



	if (is_compat()) {

		struct compat_efi_variable *compat;



		if (count != sizeof(*compat))

			return -EINVAL;



		compat = (struct compat_efi_variable *)buf;

		attributes = compat->Attributes;

		vendor = compat->VendorGuid;

		name = compat->VariableName;

		size = compat->DataSize;

		data = compat->Data;



		err = sanity_check(var, name, vendor, size, attributes, data);

		if (err)

			return err;



		copy_out_compat(&entry->var, compat);

	} else {

		if (count != sizeof(struct efi_variable))

			return -EINVAL;
@@ -249,6 +297,7 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) 
			return err;



		memcpy(&entry->var, new_var, count);

	}



	err = efivar_entry_set(entry, attributes, size, data, NULL);

	if (err) {
@@ -263,6 +312,8 @@ static ssize_t 
efivar_show_raw(struct efivar_entry *entry, char *buf)

{

	struct efi_variable *var = &entry->var;

	struct compat_efi_variable *compat;

	size_t size;



	if (!entry || !buf)

		return 0;
@@ -272,9 +323,23 @@ efivar_show_raw(struct efivar_entry *entry, char *buf) 
			     &entry->var.DataSize, entry->var.Data))

		return -EIO;



	memcpy(buf, var, sizeof(*var));

	if (is_compat()) {

		compat = (struct compat_efi_variable *)buf;



		size = sizeof(*compat);

		memcpy(compat->VariableName, var->VariableName,

			EFI_VAR_NAME_LEN);

		memcpy(compat->Data, var->Data, sizeof(compat->Data));



		compat->VendorGuid = var->VendorGuid;

		compat->DataSize = var->DataSize;

		compat->Attributes = var->Attributes;

	} else {

		size = sizeof(*var);

		memcpy(buf, var, size);

	}



	return sizeof(*var);

	return size;

}



/*
@@ -349,8 +414,10 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj, 
			     struct bin_attribute *bin_attr,

			     char *buf, loff_t pos, size_t count)

{

	struct compat_efi_variable *compat = (struct compat_efi_variable *)buf;

	struct efi_variable *new_var = (struct efi_variable *)buf;

	struct efivar_entry *new_entry;

	bool need_compat = is_compat();

	efi_char16_t *name;

	unsigned long size;

	u32 attributes;
@@ -360,6 +427,15 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj, 
	if (!capable(CAP_SYS_ADMIN))

		return -EACCES;



	if (need_compat) {

		if (count != sizeof(*compat))

			return -EINVAL;



		attributes = compat->Attributes;

		name = compat->VariableName;

		size = compat->DataSize;

		data = compat->Data;

	} else {

		if (count != sizeof(*new_var))

			return -EINVAL;
@@ -367,6 +443,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj, 
		name = new_var->VariableName;

		size = new_var->DataSize;

		data = new_var->Data;

	}



	if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||

	    efivar_validate(name, data, size) == false) {
@@ -378,6 +455,9 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj, 
	if (!new_entry)

		return -ENOMEM;



	if (need_compat)

		copy_out_compat(&new_entry->var, compat);

	else

		memcpy(&new_entry->var, new_var, sizeof(*new_var));



	err = efivar_entry_set(new_entry, attributes, size,
@@ -404,6 +484,7 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, 
			     char *buf, loff_t pos, size_t count)

{

	struct efi_variable *del_var = (struct efi_variable *)buf;

	struct compat_efi_variable *compat;

	struct efivar_entry *entry;

	efi_char16_t *name;

	efi_guid_t vendor;
@@ -412,11 +493,20 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, 
	if (!capable(CAP_SYS_ADMIN))

		return -EACCES;



	if (is_compat()) {

		if (count != sizeof(*compat))

			return -EINVAL;



		compat = (struct compat_efi_variable *)buf;

		name = compat->VariableName;

		vendor = compat->VendorGuid;

	} else {

		if (count != sizeof(*del_var))

			return -EINVAL;



		name = del_var->VariableName;

		vendor = del_var->VendorGuid;

	}



	efivar_entry_iter_begin();

	entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true);

CRA Git | Maintained and supported by SUSTech CRA and CCSE