On 9/3/19 7:40 AM, AKASHI Takahiro wrote:
If EFI_VARIABLE_APPEND_WRITE is specified in attributes at
efi_set_variable(), specified data will be appended to the variable's
original value. Attributes other than APPEND_WRITE should not be
modified.
With this patch, APPEND_WRITE test in 'variables' selftest will pass.
Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
---
lib/efi_loader/efi_variable.c | 50 +++++++++++++++++++++--------------
1 file changed, 30 insertions(+), 20 deletions(-)
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index 6687b69a400d..5d1ee50a606e 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -423,18 +423,17 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
const efi_guid_t *vendor, u32 attributes,
efi_uintn_t data_size, const void *data)
{
- char *native_name = NULL, *val = NULL, *s;
+ char *native_name = NULL, *oval, *val = NULL, *s;
Please, use old_val install of oval.
+ size_t oval_size;
Please, use old_val_size.
efi_status_t ret = EFI_SUCCESS;
u32 attr;
EFI_ENTRY("\"%ls\" %pUl %x %zu %p", variable_name, vendor, attributes,
data_size, data);
- /* TODO: implement APPEND_WRITE */
if (!variable_name || !*variable_name || !vendor ||
((attributes & EFI_VARIABLE_RUNTIME_ACCESS) &&
- !(attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS)) ||
- (attributes & EFI_VARIABLE_APPEND_WRITE)) {
+ !(attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS))) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
Append with data_size = 0 should not delete the variable. See UEFI 2.8 spec.
If a variable does not exist, trying to delete it should return
EFI_NOT_FOUND.
If a variable is READ_ONLY we have to return EFI_WRITE_PROTECTED and
should not delete it.
I know these deficiencies are not caused by your patch. But as you are
touching the code now, could you, please, consider them.
@@ -452,28 +451,37 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
goto out;
}
- val = env_get(native_name);
- if (val) {
- parse_attr(val, &attr);
+ oval = env_get(native_name);
+ if (oval) {
+ oval = parse_attr(oval, &attr);
- /* We should not free val */
- val = NULL;
if (attr & READ_ONLY) {
ret = EFI_WRITE_PROTECTED;
goto out;
}
- /*
- * attributes won't be changed
- * TODO: take care of APPEND_WRITE once supported
- */
- if (attr != attributes) {
+ /* attributes won't be changed */
+ if (attr != (attributes & ~EFI_VARIABLE_APPEND_WRITE)) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
+
+ if (attributes & EFI_VARIABLE_APPEND_WRITE) {
+ if (!prefix(oval, "(blob)")) {
+ /* TODO: should support utf8? */
If the variable is read_only we should not append to it but return
EFI_WRITE_PROTECTED.
We never stored any data as utf8. We can eliminate all references to the
(utf8) prefix in a future patch.
In lib/efi_selftest/efi_selftest_variables.c we already have a test for
APPEND. We should change the efi_st_todo() into efi_st_error() in a
follow-up patch.
Thanks for taking care of this gap.
Best regards
Heinrich
+ return EFI_DEVICE_ERROR;
+ goto out;
+ }
+ oval_size = strlen(oval);
+ } else {
+ oval_size = 0;
+ }
+ } else {
+ oval_size = 0;
}
- val = malloc(2 * data_size + strlen("{ro,run,boot,nv}(blob)") + 1);
+ val = malloc(oval_size + 2 * data_size
+ + strlen("{ro,run,boot,nv}(blob)") + 1);
if (!val) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
@@ -481,10 +489,7 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
s = val;
- /*
- * store attributes
- * TODO: several attributes are not supported
- */
+ /* store attributes */
attributes &= (EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS);
@@ -505,8 +510,13 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
}
s += sprintf(s, "}");
+ if (oval_size)
+ /* APPEND_WRITE */
+ s += sprintf(s, oval);
+ else
+ s += sprintf(s, "(blob)");
+
/* store payload: */
- s += sprintf(s, "(blob)");
s = bin2hex(s, data, data_size);
*s = '\0';
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