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author | Igor Opaniuk <igor.opaniuk@gmail.com> | 2019-04-09 16:38:14 +0300 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2019-04-27 01:58:22 +0300 |
commit | fc1fe01b08cedd77a194bb82fa81af4fe1e39031 (patch) | |
tree | 222892e528eed7e9785a444e765014fa320bba2b /cmd | |
parent | b85d155199ff717ee1a2c43784db6d7632761679 (diff) | |
download | u-boot-fc1fe01b08cedd77a194bb82fa81af4fe1e39031.tar.xz |
avb: add support for named persistent values
AVB 2.0 spec. revision 1.1 introduces support for named persistent values
that must be tamper evident and allows AVB to store arbitrary key-value
pairs [1].
Introduce implementation of two additional AVB operations
read_persistent_value()/write_persistent_value() for retrieving/storing
named persistent values.
Correspondent pull request in the OP-TEE OS project repo [2].
[1]: https://android.googlesource.com/platform/external/avb/+/android-9.0.0_r22
[2]: https://github.com/OP-TEE/optee_os/pull/2699
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Diffstat (limited to 'cmd')
-rw-r--r-- | cmd/avb.c | 78 |
1 files changed, 78 insertions, 0 deletions
@@ -340,6 +340,76 @@ int do_avb_is_unlocked(cmd_tbl_t *cmdtp, int flag, return CMD_RET_FAILURE; } +int do_avb_read_pvalue(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + const char *name; + size_t bytes; + size_t bytes_read; + void *buffer; + char *endp; + + if (!avb_ops) { + printf("AVB 2.0 is not initialized, run 'avb init' first\n"); + return CMD_RET_FAILURE; + } + + if (argc != 3) + return CMD_RET_USAGE; + + name = argv[1]; + bytes = simple_strtoul(argv[2], &endp, 10); + if (*endp && *endp != '\n') + return CMD_RET_USAGE; + + buffer = malloc(bytes); + if (!buffer) + return CMD_RET_FAILURE; + + if (avb_ops->read_persistent_value(avb_ops, name, bytes, buffer, + &bytes_read) == AVB_IO_RESULT_OK) { + printf("Read %ld bytes, value = %s\n", bytes_read, + (char *)buffer); + free(buffer); + return CMD_RET_SUCCESS; + } + + printf("Failed to read persistent value\n"); + + free(buffer); + + return CMD_RET_FAILURE; +} + +int do_avb_write_pvalue(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + const char *name; + const char *value; + + if (!avb_ops) { + printf("AVB 2.0 is not initialized, run 'avb init' first\n"); + return CMD_RET_FAILURE; + } + + if (argc != 3) + return CMD_RET_USAGE; + + name = argv[1]; + value = argv[2]; + + if (avb_ops->write_persistent_value(avb_ops, name, strlen(value) + 1, + (const uint8_t *)value) == + AVB_IO_RESULT_OK) { + printf("Wrote %ld bytes\n", strlen(value) + 1); + return CMD_RET_SUCCESS; + } + + printf("Failed to write persistent value\n"); + + return CMD_RET_FAILURE; +} + static cmd_tbl_t cmd_avb[] = { U_BOOT_CMD_MKENT(init, 2, 0, do_avb_init, "", ""), U_BOOT_CMD_MKENT(read_rb, 2, 0, do_avb_read_rb, "", ""), @@ -350,6 +420,10 @@ static cmd_tbl_t cmd_avb[] = { U_BOOT_CMD_MKENT(read_part_hex, 4, 0, do_avb_read_part_hex, "", ""), U_BOOT_CMD_MKENT(write_part, 5, 0, do_avb_write_part, "", ""), U_BOOT_CMD_MKENT(verify, 1, 0, do_avb_verify_part, "", ""), +#ifdef CONFIG_OPTEE_TA_AVB + U_BOOT_CMD_MKENT(read_pvalue, 3, 0, do_avb_read_pvalue, "", ""), + U_BOOT_CMD_MKENT(write_pvalue, 3, 0, do_avb_write_pvalue, "", ""), +#endif }; static int do_avb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) @@ -384,6 +458,10 @@ U_BOOT_CMD( " partition <partname> and print to stdout\n" "avb write_part <partname> <offset> <num> <addr> - write <num> bytes to\n" " <partname> by <offset> using data from <addr>\n" +#ifdef CONFIG_OPTEE_TA_AVB + "avb read_pvalue <name> <bytes> - read a persistent value <name>\n" + "avb write_pvalue <name> <value> - write a persistent value <name>\n" +#endif "avb verify - run verification process using hash data\n" " from vbmeta structure\n" ); |