diff options
Diffstat (limited to 'futility/updater_quirks.c')
| -rw-r--r-- | futility/updater_quirks.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/futility/updater_quirks.c b/futility/updater_quirks.c index 6a3fa222..c1d937af 100644 --- a/futility/updater_quirks.c +++ b/futility/updater_quirks.c @@ -9,6 +9,8 @@ #include <assert.h> #include <stdio.h> #include <string.h> +#include <sys/types.h> +#include <sys/stat.h> #include "updater.h" #include "host_misc.h" @@ -31,6 +33,9 @@ static const struct quirks_record quirks_records[] = { { .match = "Google_Caroline.", .quirks = "unlock_me_for_update" }, { .match = "Google_Cave.", .quirks = "unlock_me_for_update" }, + { .match = "Google_Eve.", + .quirks = "unlock_me_for_update,eve_smm_store" }, + { .match = "Google_Poppy.", .quirks = "min_platform_version=6" }, { .match = "Google_Scarlet.", .quirks = "min_platform_version=1" }, @@ -220,6 +225,81 @@ static int quirk_daisy_snow_dual_model(struct updater_config *cfg) } /* + * Extracts files from a CBFS on given region (section) of image_file. + * Returns the path to a temporary file on success, otherwise NULL. + */ +static const char *extract_cbfs_file(struct updater_config *cfg, + const char *image_file, + const char *cbfs_region, + const char *cbfs_name) +{ + const char *output = create_temp_file(cfg); + char *command, *result; + + if (asprintf(&command, "cbfstool \"%s\" extract -r %s -n \"%s\" " + "-f \"%s\" 2>&1", image_file, cbfs_region, + cbfs_name, output) < 0) { + ERROR("Failed to allocate internal buffer."); + return NULL; + } + result = host_shell(command); + free(command); + + if (!*result) + output = NULL; + + free(result); + return output; +} + +/* + * Quirk to help preserving SMM store on devices without a dedicated "SMMSTORE" + * FMAP section. These devices will store "smm store" file in same CBFS where + * the legacy boot loader lives (i.e, FMAP RW_LEGACY). + * Note this currently has dependency on external program "cbstool". + * Returns 0 if the SMM store is properly preserved, or if the system is not + * available to do that (problem in cbfstool, or no "smm store" in current + * system firmware). Otherwise non-zero as failure. + */ +static int quirk_eve_smm_store(struct updater_config *cfg) +{ + const char *smm_store_name = "smm store"; + const char *temp_image = create_temp_file(cfg); + const char *old_store; + char *command; + + if (write_image(temp_image, &cfg->image_current) != VBERROR_SUCCESS) + return -1; + + old_store = extract_cbfs_file(cfg, temp_image, FMAP_RW_LEGACY, + smm_store_name); + if (!old_store) { + DEBUG("cbfstool failure or SMM store not available. " + "Don't preserve."); + return 0; + } + + /* Reuse temp_image. */ + if (write_image(temp_image, &cfg->image) != VBERROR_SUCCESS) + return -1; + + /* crosreview.com/1165109: The offset is fixed at 0x1bf000. */ + if (asprintf(&command, + "cbfstool \"%s\" remove -r %s -n \"%s\" 2>/dev/null; " + "cbfstool \"%s\" add -r %s -n \"%s\" -f \"%s\" " + " -t raw -b 0x1bf000", temp_image, FMAP_RW_LEGACY, + smm_store_name, temp_image, FMAP_RW_LEGACY, + smm_store_name, old_store) < 0) { + ERROR("Failed to allocate internal buffer."); + return -1; + } + host_shell(command); + free(command); + + return reload_image(temp_image, &cfg->image); +} + +/* * Registers known quirks to a updater_config object. */ void updater_register_quirks(struct updater_config *cfg) @@ -248,6 +328,12 @@ void updater_register_quirks(struct updater_config *cfg) quirks->name = "daisy_snow_dual_model"; quirks->help = "b/35525858; needs an image RW A=[model x16], B=x8."; quirks->apply = quirk_daisy_snow_dual_model; + + quirks = &cfg->quirks[QUIRK_EVE_SMM_STORE]; + quirks->name = "eve_smm_store"; + quirks->help = "b/70682365; preserve UEFI SMM store without " + "dedicated FMAP section."; + quirks->apply = quirk_eve_smm_store; } /* |