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Subject[PATCH 3/5] efivars: Stop passing a struct argument to efivar_validate()
Date
From: Matt Fleming <matt.fleming@intel.com>

In preparation for compat support, we can't assume that user variable
object is represented by a 'struct efi_variable'. Convert the validation
functions to take the variable name as an argument, which is the only
piece of the struct that was ever used anyway.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
drivers/firmware/efi/efivars.c | 6 ++++--
drivers/firmware/efi/vars.c | 30 +++++++++++++++---------------
include/linux/efi.h | 6 ++++--
3 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 2c21cccc2572..5ee2cfb96698 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -231,7 +231,7 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
}

if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
- efivar_validate(new_var, data, size) == false) {
+ efivar_validate(name, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
@@ -339,6 +339,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
{
struct efi_variable *new_var = (struct efi_variable *)buf;
struct efivar_entry *new_entry;
+ efi_char16_t *name;
unsigned long size;
u32 attributes;
u8 *data;
@@ -351,11 +352,12 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
return -EINVAL;

attributes = new_var->Attributes;
+ name = new_var->VariableName;
size = new_var->DataSize;
data = new_var->Data;

if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
- efivar_validate(new_var, data, size) == false) {
+ efivar_validate(name, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c
index b22659cccca4..f0a43646a2f3 100644
--- a/drivers/firmware/efi/vars.c
+++ b/drivers/firmware/efi/vars.c
@@ -42,7 +42,7 @@ DECLARE_WORK(efivar_work, NULL);
EXPORT_SYMBOL_GPL(efivar_work);

static bool
-validate_device_path(struct efi_variable *var, int match, u8 *buffer,
+validate_device_path(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
struct efi_generic_dev_path *node;
@@ -75,7 +75,7 @@ validate_device_path(struct efi_variable *var, int match, u8 *buffer,
}

static bool
-validate_boot_order(struct efi_variable *var, int match, u8 *buffer,
+validate_boot_order(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
/* An array of 16-bit integers */
@@ -86,18 +86,18 @@ validate_boot_order(struct efi_variable *var, int match, u8 *buffer,
}

static bool
-validate_load_option(struct efi_variable *var, int match, u8 *buffer,
+validate_load_option(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
u16 filepathlength;
int i, desclength = 0, namelen;

- namelen = ucs2_strnlen(var->VariableName, sizeof(var->VariableName));
+ namelen = ucs2_strnlen(var_name, EFI_VAR_NAME_LEN);

/* Either "Boot" or "Driver" followed by four digits of hex */
for (i = match; i < match+4; i++) {
- if (var->VariableName[i] > 127 ||
- hex_to_bin(var->VariableName[i] & 0xff) < 0)
+ if (var_name[i] > 127 ||
+ hex_to_bin(var_name[i] & 0xff) < 0)
return true;
}

@@ -132,12 +132,12 @@ validate_load_option(struct efi_variable *var, int match, u8 *buffer,
/*
* And, finally, check the filepath
*/
- return validate_device_path(var, match, buffer + desclength + 6,
+ return validate_device_path(var_name, match, buffer + desclength + 6,
filepathlength);
}

static bool
-validate_uint16(struct efi_variable *var, int match, u8 *buffer,
+validate_uint16(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
/* A single 16-bit integer */
@@ -148,7 +148,7 @@ validate_uint16(struct efi_variable *var, int match, u8 *buffer,
}

static bool
-validate_ascii_string(struct efi_variable *var, int match, u8 *buffer,
+validate_ascii_string(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
int i;
@@ -166,7 +166,7 @@ validate_ascii_string(struct efi_variable *var, int match, u8 *buffer,

struct variable_validate {
char *name;
- bool (*validate)(struct efi_variable *var, int match, u8 *data,
+ bool (*validate)(efi_char16_t *var_name, int match, u8 *data,
unsigned long len);
};

@@ -189,10 +189,10 @@ static const struct variable_validate variable_validate[] = {
};

bool
-efivar_validate(struct efi_variable *var, u8 *data, unsigned long len)
+efivar_validate(efi_char16_t *var_name, u8 *data, unsigned long len)
{
int i;
- u16 *unicode_name = var->VariableName;
+ u16 *unicode_name = var_name;

for (i = 0; variable_validate[i].validate != NULL; i++) {
const char *name = variable_validate[i].name;
@@ -208,7 +208,7 @@ efivar_validate(struct efi_variable *var, u8 *data, unsigned long len)

/* Wildcard in the matching name means we've matched */
if (c == '*')
- return variable_validate[i].validate(var,
+ return variable_validate[i].validate(var_name,
match, data, len);

/* Case sensitive match */
@@ -217,7 +217,7 @@ efivar_validate(struct efi_variable *var, u8 *data, unsigned long len)

/* Reached the end of the string while matching */
if (!c)
- return variable_validate[i].validate(var,
+ return variable_validate[i].validate(var_name,
match, data, len);
}
}
@@ -805,7 +805,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,

*set = false;

- if (efivar_validate(&entry->var, data, *size) == false)
+ if (efivar_validate(name, data, *size) == false)
return -EINVAL;

/*
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 6c100ff0cae4..0f5f6d54fb56 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1033,8 +1033,10 @@ struct efivars {
* and we use a page for reading/writing.
*/

+#define EFI_VAR_NAME_LEN 1024
+
struct efi_variable {
- efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
+ efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];
efi_guid_t VendorGuid;
unsigned long DataSize;
__u8 Data[1024];
@@ -1116,7 +1118,7 @@ int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
struct list_head *head, bool remove);

-bool efivar_validate(struct efi_variable *var, u8 *data, unsigned long len);
+bool efivar_validate(efi_char16_t *var_name, u8 *data, unsigned long len);

extern struct work_struct efivar_work;
void efivar_run_worker(void);
--
1.8.5.3


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