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ieee1275/tcg2: Add TCG2 driver for ieee1275 PowerPC firmware

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Follow recent extensions of EFI support providing a TCG2 driver with
a public API for getting the maximum TPM command size and passing a TPM
command through to the TPM 2. Implement this functionality using ieee1275
PowerPC firmware API calls. Move tcg2.c into the TCG2 driver.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Stefan Berger 2024-11-26 15:39:45 -05:00 committed by Daniel Kiper
parent 72092a8641
commit ff14b89bda
2 changed files with 104 additions and 1 deletions
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3
grub-core/Makefile.core.def
View File

@ -1155,7 +1155,6 @@ module = {
name = tpm;
common = commands/tpm.c;
ieee1275 = commands/ieee1275/ibmvtpm.c;
ieee1275 = lib/ieee1275/tcg2.c;
enable = powerpc_ieee1275;
};
@ -2576,8 +2575,10 @@ module = {
common = lib/tss2/tss2.c;
efi = lib/efi/tcg2.c;
emu = lib/tss2/tcg2_emu.c;
powerpc_ieee1275 = lib/ieee1275/tcg2.c;
enable = efi;
enable = emu;
enable = powerpc_ieee1275;
cppflags = '-I$(srcdir)/lib/tss2';
};

102
grub-core/lib/ieee1275/tcg2.c
View File

@ -23,6 +23,8 @@
#include <grub/mm.h>
#include <grub/misc.h>
#include <tcg2.h>
grub_ieee1275_ihandle_t grub_ieee1275_tpm_ihandle = GRUB_IEEE1275_IHANDLE_INVALID;
grub_err_t
@ -53,3 +55,103 @@ grub_ieee1275_tpm_init (void)
return GRUB_ERR_NONE;
}
grub_err_t
grub_tcg2_get_max_output_size (grub_size_t *size)
{
struct tpm_get_maximum_cmd_size
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t catch_result;
grub_ieee1275_cell_t size;
};
struct tpm_get_maximum_cmd_size args;
static bool error_displayed = false;
grub_err_t err;
err = grub_ieee1275_tpm_init ();
if (err != GRUB_ERR_NONE)
return err;
INIT_IEEE1275_COMMON (&args.common, "call-method", 2, 2);
args.method = (grub_ieee1275_cell_t) "get-maximum-cmd-size";
args.ihandle = grub_ieee1275_tpm_ihandle;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return GRUB_ERR_INVALID_COMMAND;
/*
* args.catch_result is set if firmware does not support get-maximum-cmd-size.
* rc is GRUB_IEEE1275_CELL_FALSE (0) on failure.
*/
if (args.catch_result)
{
if (error_displayed == false)
{
error_displayed = true;
return grub_error (GRUB_ERR_BAD_DEVICE,
"get-maximum-cmd-size failed: Firmware is likely too old");
}
return GRUB_ERR_INVALID_COMMAND;
}
*size = args.size;
return GRUB_ERR_NONE;
}
grub_err_t
grub_tcg2_submit_command (grub_size_t input_size,
grub_uint8_t *input,
grub_size_t output_size,
grub_uint8_t *output)
{
struct tpm_pass_through_to_tpm
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t buf_size;
grub_ieee1275_cell_t buf_addr;
grub_ieee1275_cell_t catch_result;
grub_ieee1275_cell_t resp_size;
};
struct tpm_pass_through_to_tpm args;
static bool error_displayed = false;
grub_err_t err;
if (input_size == 0 || input == NULL ||
output_size == 0 || output == NULL)
return GRUB_ERR_BAD_ARGUMENT;
err = grub_ieee1275_tpm_init ();
if (err != GRUB_ERR_NONE)
return err;
INIT_IEEE1275_COMMON (&args.common, "call-method", 4, 2);
args.method = (grub_ieee1275_cell_t) "pass-through-to-tpm";
args.ihandle = grub_ieee1275_tpm_ihandle;
args.buf_size = (grub_ieee1275_cell_t) input_size;
args.buf_addr = (grub_ieee1275_cell_t) input;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return GRUB_ERR_INVALID_COMMAND;
/* args.catch_result is set if firmware does not support pass-through-to-tpm. */
if (args.catch_result)
{
if (error_displayed == false)
{
error_displayed = true;
return grub_error (GRUB_ERR_BAD_DEVICE,
"pass-through-to-tpm failed: Firmware is likely too old");
}
return GRUB_ERR_INVALID_COMMAND;
}
grub_memcpy (output, input, args.resp_size);
return GRUB_ERR_NONE;
}