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efi_loader: SetVariable() deleting variables

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APPEND_WRITE with data length zero is allowable according to the UEFI
specification.

The EDK2 interpretation of no access attributes is attributes = 0. As
the UEFI specification is vague in this respect let's stick to EDK2 here.

Fixes: commit 6d2f27c5fd ("efi_loader: variable: support APPEND_WRITE")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-09-23 22:38:53 +02:00
parent edb6b6842c
commit 3545c66143
1 changed files with 6 additions and 5 deletions
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11
lib/efi_loader/efi_variable.c
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@ -443,8 +443,6 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
if (ret)
goto out;
#define ACCESS_ATTR (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)
old_val = env_get(native_name);
if (old_val) {
old_val = parse_attr(old_val, &attr);
@ -455,7 +453,9 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
goto out;
}
if ((data_size == 0) || !(attributes & ACCESS_ATTR)) {
if ((data_size == 0 &&
!(attributes & EFI_VARIABLE_APPEND_WRITE)) ||
!attributes) {
/* delete the variable: */
env_set(native_name, NULL);
ret = EFI_SUCCESS;
@ -478,8 +478,9 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
old_size = 0;
}
} else {
if ((data_size == 0) || !(attributes & ACCESS_ATTR) ||
(attributes & EFI_VARIABLE_APPEND_WRITE)) {
if ((data_size == 0 &&
!(attributes & EFI_VARIABLE_APPEND_WRITE)) ||
!attributes) {
/* delete, but nothing to do */
ret = EFI_NOT_FOUND;
goto out;