From ffe2157447ce0101802e717147001fd59581e759 Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Fri, 26 Apr 2019 09:44:18 +0900 Subject: cmd: efidebug: rework "boot dump" sub-command using GetNextVariableName() Currently in do_efi_boot_dump(), we directly read EFI variables from related environment variables. To accommodate alternative storage backends, we should switch to using the UEFI API instead. Signed-off-by: AKASHI Takahiro Reviewed-by: Heinrich Schuchardt --- cmd/efidebug.c | 79 ++++++++++++++++++++++++++++++++++++++++------------------ 1 file changed, 55 insertions(+), 24 deletions(-) (limited to 'cmd/efidebug.c') diff --git a/cmd/efidebug.c b/cmd/efidebug.c index a40c4f4be2..efe4ea873e 100644 --- a/cmd/efidebug.c +++ b/cmd/efidebug.c @@ -693,6 +693,17 @@ static void show_efi_boot_opt(int id) free(data); } +static int u16_tohex(u16 c) +{ + if (c >= '0' && c <= '9') + return c - '0'; + if (c >= 'A' && c <= 'F') + return c - 'A' + 10; + + /* not hexadecimal */ + return -1; +} + /** * show_efi_boot_dump() - dump all UEFI load options * @@ -709,38 +720,58 @@ static void show_efi_boot_opt(int id) static int do_efi_boot_dump(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { - char regex[256]; - char * const regexlist[] = {regex}; - char *variables = NULL, *boot, *value; - int len; - int id; + u16 *var_name16, *p; + efi_uintn_t buf_size, size; + efi_guid_t guid; + int id, i, digit; + efi_status_t ret; if (argc > 1) return CMD_RET_USAGE; - snprintf(regex, 256, "efi_.*-.*-.*-.*-.*_Boot[0-9A-F]+"); - - /* TODO: use GetNextVariableName? */ - len = hexport_r(&env_htab, '\n', H_MATCH_REGEX | H_MATCH_KEY, - &variables, 0, 1, regexlist); - - if (!len) - return CMD_RET_SUCCESS; - - if (len < 0) + buf_size = 128; + var_name16 = malloc(buf_size); + if (!var_name16) return CMD_RET_FAILURE; - boot = variables; - while (*boot) { - value = strstr(boot, "Boot") + 4; - id = (int)simple_strtoul(value, NULL, 16); - show_efi_boot_opt(id); - boot = strchr(boot, '\n'); - if (!*boot) + var_name16[0] = 0; + for (;;) { + size = buf_size; + ret = EFI_CALL(efi_get_next_variable_name(&size, var_name16, + &guid)); + if (ret == EFI_NOT_FOUND) break; - boot++; + if (ret == EFI_BUFFER_TOO_SMALL) { + buf_size = size; + p = realloc(var_name16, buf_size); + if (!p) { + free(var_name16); + return CMD_RET_FAILURE; + } + var_name16 = p; + ret = EFI_CALL(efi_get_next_variable_name(&size, + var_name16, + &guid)); + } + if (ret != EFI_SUCCESS) { + free(var_name16); + return CMD_RET_FAILURE; + } + + if (memcmp(var_name16, L"Boot", 8)) + continue; + + for (id = 0, i = 0; i < 4; i++) { + digit = u16_tohex(var_name16[4 + i]); + if (digit < 0) + break; + id = (id << 4) + digit; + } + if (i == 4 && !var_name16[8]) + show_efi_boot_opt(id); } - free(variables); + + free(var_name16); return CMD_RET_SUCCESS; } -- cgit v1.2.3 From 39a1ff8ceab4b74164b2e19217206e7226aa9cd8 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Mon, 29 Apr 2019 13:51:45 +0200 Subject: efi_loader: optional data in load options are binary 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 --- cmd/efidebug.c | 27 +++++++++++++++++---------- include/efi_loader.h | 2 +- lib/efi_loader/efi_bootmgr.c | 15 ++++++++------- 3 files changed, 26 insertions(+), 18 deletions(-) (limited to 'cmd/efidebug.c') diff --git a/cmd/efidebug.c b/cmd/efidebug.c index efe4ea873e..c4ac9dd634 100644 --- a/cmd/efidebug.c +++ b/cmd/efidebug.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -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; } -- cgit v1.2.3