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vendorcode/google/chromeos: Use unsigned int for "factory_config" 

This patch ensures `chromeos_get_factory_config()` returns an
unsigned integer value because factory config represents
bit-fields to determine the Chromebook Plus branding.

Additionally, introduced safety measures to catch future
"factory_config" bit-field exhaustion.

BUG=b:317880956
TEST=Able to verify that google/screebo is branded as
Chromebook Plus.

Change-Id: I3021b8646de4750b4c8e2a2981f42500894fa2d0
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79769
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Subrata Banik 2024-01-02 23:28:49 +05:30
parent c64be928de
commit 8e7251c625
2 changed files with 15 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/vendorcode/google/chromeos/chromeos.h
View File

@ -17,6 +17,8 @@ static inline void mark_watchdog_tombstone(void) { return; }
static inline void reboot_from_watchdog(void) { return; } static inline void reboot_from_watchdog(void) { return; }
#endif /* CONFIG_CHROMEOS */ #endif /* CONFIG_CHROMEOS */
#define UNDEFINED_FACTORY_CONFIG ~((uint64_t)0)
/** /**
* Perform any platform specific actions required prior to resetting the Cr50. * Perform any platform specific actions required prior to resetting the Cr50.
* Defined as weak function in cr50_enable_update.c * Defined as weak function in cr50_enable_update.c
@ -29,9 +31,9 @@ void chromeos_set_ramoops(void *ram_oops, size_t size);
/* /*
* The factory config space is a one-time programmable info page. * The factory config space is a one-time programmable info page.
* For the unprovisioned one, the read will be 0x0. * For the unprovisioned one, the read will be 0x0.
* Return `-1` in case of error. * Return "UNDEFINED_FACTORY_CONFIG" in case of error.
*/ */
int64_t chromeos_get_factory_config(void); uint64_t chromeos_get_factory_config(void);
/* /*
* Determines whether a ChromeOS device is branded as a Chromebook Plus * Determines whether a ChromeOS device is branded as a Chromebook Plus
* based on specific bit flags: * based on specific bit flags:

19
src/vendorcode/google/chromeos/tpm_factory_config.c
View File

@ -1,5 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */ /* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <console/console.h> #include <console/console.h>
#include <security/tpm/tss.h> #include <security/tpm/tss.h>
#include <types.h> #include <types.h>
@ -9,11 +10,11 @@
#define CHROMEBOOK_PLUS_SOFT_BRANDED BIT(0) #define CHROMEBOOK_PLUS_SOFT_BRANDED BIT(0)
#define CHROMEBOOK_PLUS_DEVICE (CHROMEBOOK_PLUS_HARD_BRANDED | CHROMEBOOK_PLUS_SOFT_BRANDED) #define CHROMEBOOK_PLUS_DEVICE (CHROMEBOOK_PLUS_HARD_BRANDED | CHROMEBOOK_PLUS_SOFT_BRANDED)
int64_t chromeos_get_factory_config(void) uint64_t chromeos_get_factory_config(void)
{ {
static int64_t factory_config = -1; static uint64_t factory_config = UNDEFINED_FACTORY_CONFIG;
if (factory_config >= 0) if (factory_config != UNDEFINED_FACTORY_CONFIG)
return factory_config; return factory_config;
/* Initialize TPM driver. */ /* Initialize TPM driver. */
@ -21,17 +22,19 @@ int64_t chromeos_get_factory_config(void)
if (rc != TPM_SUCCESS) { if (rc != TPM_SUCCESS) {
printk(BIOS_ERR, "%s:%d - tlcl_lib_init() failed: %#x\n", printk(BIOS_ERR, "%s:%d - tlcl_lib_init() failed: %#x\n",
__func__, __LINE__, rc); __func__, __LINE__, rc);
return -1; return UNDEFINED_FACTORY_CONFIG;
} }
rc = tlcl_cr50_get_factory_config((uint64_t *)&factory_config); rc = tlcl_cr50_get_factory_config(&factory_config);
if (rc != TPM_SUCCESS) { if (rc != TPM_SUCCESS) {
printk(BIOS_ERR, "%s:%d - tlcl_cr50_get_factory_config() failed: %#x\n", printk(BIOS_ERR, "%s:%d - tlcl_cr50_get_factory_config() failed: %#x\n",
__func__, __LINE__, rc); __func__, __LINE__, rc);
return -1; return UNDEFINED_FACTORY_CONFIG;
} }
assert(factory_config != UNDEFINED_FACTORY_CONFIG);
return factory_config; return factory_config;
} }
@ -48,9 +51,9 @@ int64_t chromeos_get_factory_config(void)
*/ */
bool chromeos_device_branded_plus(void) bool chromeos_device_branded_plus(void)
{ {
int64_t factory_config = chromeos_get_factory_config(); uint64_t factory_config = chromeos_get_factory_config();
if (factory_config < 0) if (factory_config == UNDEFINED_FACTORY_CONFIG)
return false; return false;
return factory_config & CHROMEBOOK_PLUS_DEVICE; return factory_config & CHROMEBOOK_PLUS_DEVICE;