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* Avoid confusing the user by returning -EIO instead of -ENOENT in

Browse source 
efivarfs if an EFI variable gets deleted from under us and return EOF
    when reading from a zero-length file - Lingzhu Xiang
 
  * Fix an oops in efivar_update_sysfs_entries() caused by reusing (and
    therefore corrupting) a kzalloc() allocation - Seiji Aguchi
 
  * Initialise the DataSize argument to GetVariable() otherwise it will
    not be updated with the actual size of the variable on return.
    Discovered on a Acer Aspire V3 BIOS - Lee, Chun-Yi
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Merge tag 'efi-urgent' into x86/urgent

 * Avoid confusing the user by returning -EIO instead of -ENOENT in
   efivarfs if an EFI variable gets deleted from under us and return EOF
   when reading from a zero-length file - Lingzhu Xiang

 * Fix an oops in efivar_update_sysfs_entries() caused by reusing (and
   therefore corrupting) a kzalloc() allocation - Seiji Aguchi

 * Initialise the DataSize argument to GetVariable() otherwise it will
   not be updated with the actual size of the variable on return.
   Discovered on a Acer Aspire V3 BIOS - Lee, Chun-Yi

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
H. Peter Anvin 2013-05-22 10:58:57 -07:00
parent fbe06b7bae eccaf52fee
commit 3979fdce77
3 changed files with 16 additions and 8 deletions
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2
arch/x86/platform/efi/efi.c
View file

@ -206,7 +206,7 @@ static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
}
if (boot_used_size && !finished) {
unsigned long size;
unsigned long size = 0;
u32 attr;
efi_status_t s;
void *tmp;

8
drivers/firmware/efi/efivars.c
View file

@ -523,13 +523,11 @@ static void efivar_update_sysfs_entries(struct work_struct *work)
struct efivar_entry *entry;
int err;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return;
/* Add new sysfs entries */
while (1) {
memset(entry, 0, sizeof(*entry));
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return;
err = efivar_init(efivar_update_sysfs_entry, entry,
true, false, &efivar_sysfs_list);

14
fs/efivarfs/file.c
View file

@ -44,8 +44,11 @@ static ssize_t efivarfs_file_write(struct file *file,
bytes = efivar_entry_set_get_size(var, attributes, &datasize,
data, &set);
if (!set && bytes)
if (!set && bytes) {
if (bytes == -ENOENT)
bytes = -EIO;
goto out;
}
if (bytes == -ENOENT) {
drop_nlink(inode);
@ -76,7 +79,14 @@ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
int err;
err = efivar_entry_size(var, &datasize);
if (err)
/*
* efivarfs represents uncommitted variables with
* zero-length files. Reading them should return EOF.
*/
if (err == -ENOENT)
return 0;
else if (err)
return err;
data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);