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Message-Id: <20200504232132.23570-11-daniel.kiper@oracle.com>
Date: Tue, 5 May 2020 01:21:24 +0200
From: Daniel Kiper <daniel.kiper@...cle.com>
To: grub-devel@....org, linux-kernel@...r.kernel.org,
trenchboot-devel@...glegroups.com, x86@...nel.org
Cc: alexander.burmashev@...cle.com, andrew.cooper3@...rix.com,
ard.biesheuvel@...aro.org, dpsmith@...rtussolutions.com,
eric.snowberg@...cle.com, javierm@...hat.com,
kanth.ghatraju@...cle.com, konrad.wilk@...cle.com,
krystian.hebel@...eb.com, lukasz.hawrylko@...ux.intel.com,
michal.zygowski@...eb.com, mjg59@...gle.com, phcoder@...il.com,
pirot.krol@...eb.com, pjones@...hat.com, ross.philipson@...cle.com
Subject: [GRUB PATCH RFC 10/18] efi: Return grub_efi_status_t from grub_efi_get_variable()
This is needed to properly detect and report UEFI Secure Boot status
to the x86 Linux kernel. The functionality will be added by subsequent
patches.
Signed-off-by: Daniel Kiper <daniel.kiper@...cle.com>
---
grub-core/commands/efi/efifwsetup.c | 8 ++++----
grub-core/kern/efi/efi.c | 16 +++++++++-------
grub-core/video/efi_gop.c | 2 +-
include/grub/efi/efi.h | 7 ++++---
4 files changed, 18 insertions(+), 15 deletions(-)
diff --git a/grub-core/commands/efi/efifwsetup.c b/grub-core/commands/efi/efifwsetup.c
index 7a137a72a..eaca03283 100644
--- a/grub-core/commands/efi/efifwsetup.c
+++ b/grub-core/commands/efi/efifwsetup.c
@@ -38,8 +38,8 @@ grub_cmd_fwsetup (grub_command_t cmd __attribute__ ((unused)),
grub_size_t oi_size;
grub_efi_guid_t global = GRUB_EFI_GLOBAL_VARIABLE_GUID;
- old_os_indications = grub_efi_get_variable ("OsIndications", &global,
- &oi_size);
+ grub_efi_get_variable ("OsIndications", &global, &oi_size,
+ (void **) &old_os_indications);
if (old_os_indications != NULL && oi_size == sizeof (os_indications))
os_indications |= *old_os_indications;
@@ -63,8 +63,8 @@ efifwsetup_is_supported (void)
grub_size_t oi_size = 0;
grub_efi_guid_t global = GRUB_EFI_GLOBAL_VARIABLE_GUID;
- os_indications_supported = grub_efi_get_variable ("OsIndicationsSupported",
- &global, &oi_size);
+ grub_efi_get_variable ("OsIndicationsSupported", &global, &oi_size,
+ (void **) &os_indications_supported);
if (!os_indications_supported)
return 0;
diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index 3a708ed72..81bc49f84 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -222,9 +222,9 @@ grub_efi_set_variable(const char *var, const grub_efi_guid_t *guid,
return grub_error (GRUB_ERR_IO, "could not set EFI variable `%s'", var);
}
-void *
+grub_efi_status_t
grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
- grub_size_t *datasize_out)
+ grub_size_t *datasize_out, void **data_out)
{
grub_efi_status_t status;
grub_efi_uintn_t datasize = 0;
@@ -233,13 +233,14 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
void *data;
grub_size_t len, len16;
+ *data_out = NULL;
*datasize_out = 0;
len = grub_strlen (var);
len16 = len * GRUB_MAX_UTF16_PER_UTF8;
var16 = grub_malloc ((len16 + 1) * sizeof (var16[0]));
if (!var16)
- return NULL;
+ return GRUB_EFI_OUT_OF_RESOURCES;
len16 = grub_utf8_to_utf16 (var16, len16, (grub_uint8_t *) var, len, NULL);
var16[len16] = 0;
@@ -250,14 +251,14 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
if (status != GRUB_EFI_BUFFER_TOO_SMALL || !datasize)
{
grub_free (var16);
- return NULL;
+ return status;
}
data = grub_malloc (datasize);
if (!data)
{
grub_free (var16);
- return NULL;
+ return GRUB_EFI_OUT_OF_RESOURCES;
}
status = efi_call_5 (r->get_variable, var16, guid, NULL, &datasize, data);
@@ -265,12 +266,13 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
if (status == GRUB_EFI_SUCCESS)
{
+ *data_out = data;
*datasize_out = datasize;
- return data;
+ return status;
}
grub_free (data);
- return NULL;
+ return status;
}
#pragma GCC diagnostic ignored "-Wcast-align"
diff --git a/grub-core/video/efi_gop.c b/grub-core/video/efi_gop.c
index be446f8d2..7fe0cdabf 100644
--- a/grub-core/video/efi_gop.c
+++ b/grub-core/video/efi_gop.c
@@ -316,7 +316,7 @@ grub_video_gop_get_edid (struct grub_video_edid_info *edid_info)
char edidname[] = "agp-internal-edid";
grub_size_t datasize;
grub_uint8_t *data;
- data = grub_efi_get_variable (edidname, &efi_var_guid, &datasize);
+ grub_efi_get_variable (edidname, &efi_var_guid, &datasize, (void **) &data);
if (data && datasize > 16)
{
copy_size = datasize - 16;
diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
index e90e00dc4..8b2a0f1f5 100644
--- a/include/grub/efi/efi.h
+++ b/include/grub/efi/efi.h
@@ -74,9 +74,10 @@ grub_err_t EXPORT_FUNC (grub_efi_set_virtual_address_map) (grub_efi_uintn_t memo
grub_efi_uintn_t descriptor_size,
grub_efi_uint32_t descriptor_version,
grub_efi_memory_descriptor_t *virtual_map);
-void *EXPORT_FUNC (grub_efi_get_variable) (const char *variable,
- const grub_efi_guid_t *guid,
- grub_size_t *datasize_out);
+grub_efi_status_t EXPORT_FUNC (grub_efi_get_variable) (const char *variable,
+ const grub_efi_guid_t *guid,
+ grub_size_t *datasize_out,
+ void **data_out);
grub_err_t
EXPORT_FUNC (grub_efi_set_variable) (const char *var,
const grub_efi_guid_t *guid,
--
2.11.0
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