The field boot OptionalData in structure _EFI_LOAD_OPTIONS is for binary
data.
When we use `efidebug boot add` we should convert the 5th argument from
UTF-8 to UTF-16 before putting it into the BootXXXX variable.
When printing boot variables with `efidebug boot dump` we should support
the OptionalData being arbitrary binary data. So let's dump the data as
hexadecimal values.
Here is an example session protocol:
=> efidebug boot add 00a1 label1 scsi 0:1 doit1 'my option'
=> efidebug boot add 00a2 label2 scsi 0:1 doit2
=> efidebug boot dump
Boot00A0:
attributes: A-- (0x00000001)
label: label1
file_path: .../HD(1,MBR,0xeac4e18b,0x800,0x3fffe)/doit1
data:
00000000: 6d 00 79 00 20 00 6f 00 70 00 74 00 69 00 6f 00 m.y. .o.p.t.i.o.
00000010: 6e 00 00 00 n...
Boot00A1:
attributes: A-- (0x00000001)
label: label2
file_path: .../HD(1,MBR,0xeac4e18b,0x800,0x3fffe)/doit2
data:
Signed-off-by: Heinrich Schuchardt <[email protected]>
---
Resend to incorrect email address original post.
---
cmd/efidebug.c | 27 +++++++++++++++++----------
include/efi_loader.h | 2 +-
lib/efi_loader/efi_bootmgr.c | 15 ++++++++-------
3 files changed, 26 insertions(+), 18 deletions(-)
diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index a40c4f4be2..e4cc92ec0e 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -11,6 +11,7 @@
#include <efi_loader.h>
#include <environment.h>
#include <exports.h>
+#include <hexdump.h>
#include <malloc.h>
#include <search.h>
#include <linux/ctype.h>
@@ -545,7 +546,10 @@ static int do_efi_boot_add(cmd_tbl_t *cmdtp, int flag,
+ sizeof(struct efi_device_path); /* for END */
/* optional data */
- lo.optional_data = (u8 *)(argc == 6 ? "" : argv[6]);
+ if (argc < 6)
+ lo.optional_data = NULL;
+ else
+ lo.optional_data = (const u8 *)argv[6];
size = efi_serialize_load_option(&lo, (u8 **)&data);
if (!size) {
@@ -615,12 +619,13 @@ static int do_efi_boot_rm(cmd_tbl_t *cmdtp, int flag,
/**
* show_efi_boot_opt_data() - dump UEFI load option
*
- * @id: Load option number
- * @data: Value of UEFI load option variable
+ * @id: load option number
+ * @data: value of UEFI load option variable
+ * @size: size of the boot option
*
* Decode the value of UEFI load option variable and print information.
*/
-static void show_efi_boot_opt_data(int id, void *data)
+static void show_efi_boot_opt_data(int id, void *data, size_t size)
{
struct efi_load_option lo;
char *label, *p;
@@ -638,7 +643,7 @@ static void show_efi_boot_opt_data(int id, void *data)
utf16_utf8_strncpy(&p, lo.label, label_len16);
printf("Boot%04X:\n", id);
- printf("\tattributes: %c%c%c (0x%08x)\n",
+ printf(" attributes: %c%c%c (0x%08x)\n",
/* ACTIVE */
lo.attributes & LOAD_OPTION_ACTIVE ? 'A' : '-',
/* FORCE RECONNECT */
@@ -646,14 +651,16 @@ static void show_efi_boot_opt_data(int id, void *data)
/* HIDDEN */
lo.attributes & LOAD_OPTION_HIDDEN ? 'H' : '-',
lo.attributes);
- printf("\tlabel: %s\n", label);
+ printf(" label: %s\n", label);
dp_str = efi_dp_str(lo.file_path);
- printf("\tfile_path: %ls\n", dp_str);
+ printf(" file_path: %ls\n", dp_str);
efi_free_pool(dp_str);
- printf("\tdata: %s\n", lo.optional_data);
-
+ printf(" data:\n");
+ print_hex_dump(" ", DUMP_PREFIX_OFFSET, 16, 1,
+ lo.optional_data, size + (u8 *)data -
+ (u8 *)lo.optional_data, true);
free(label);
}
@@ -686,7 +693,7 @@ static void show_efi_boot_opt(int id)
data));
}
if (ret == EFI_SUCCESS)
- show_efi_boot_opt_data(id, data);
+ show_efi_boot_opt_data(id, data, size);
else if (ret == EFI_NOT_FOUND)
printf("Boot%04X: not found\n", id);
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 39ed8a6fa5..07b913d256 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -560,7 +560,7 @@ struct efi_load_option {
u16 file_path_length;
u16 *label;
struct efi_device_path *file_path;
- u8 *optional_data;
+ const u8 *optional_data;
};
void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data);
diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
index 4ccba22875..7bf51874c1 100644
--- a/lib/efi_loader/efi_bootmgr.c
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -53,19 +53,20 @@ void efi_deserialize_load_option(struct efi_load_option
*lo, u8 *data)
*/
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data)
{
- unsigned long label_len, option_len;
+ unsigned long label_len;
unsigned long size;
u8 *p;
label_len = (u16_strlen(lo->label) + 1) * sizeof(u16);
- option_len = strlen((char *)lo->optional_data);
/* total size */
size = sizeof(lo->attributes);
size += sizeof(lo->file_path_length);
size += label_len;
size += lo->file_path_length;
- size += option_len + 1;
+ if (lo->optional_data)
+ size += (utf8_utf16_strlen((const char *)lo->optional_data)
+ + 1) * sizeof(u16);
p = malloc(size);
if (!p)
return 0;
@@ -84,10 +85,10 @@ unsigned long efi_serialize_load_option(struct
efi_load_option *lo, u8 **data)
memcpy(p, lo->file_path, lo->file_path_length);
p += lo->file_path_length;
- memcpy(p, lo->optional_data, option_len);
- p += option_len;
- *(char *)p = '\0';
-
+ if (lo->optional_data) {
+ utf8_utf16_strcpy((u16 **)&p, (const char *)lo->optional_data);
+ p += sizeof(u16); /* size of trailing \0 */
+ }
return size;
}
--
2.20.1
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