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Maniphest T1040

TF-A 2.8 on an MT7986 board
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Description

I'm running TF-A 2.8 on an MT7986 board, and I enabled TRUSTED_BOARD_BOOT using mbedtls-3.4.0. When I tried to load BL31, TF-A BL2 hung, and it appears that BL2 failed to obtain the correct oid in the function get_ext (drivers/auth/mbedtls/mbedtls_x509_parser.

Part of the oid is printed using %c in the 3.4.0 version of mbedtls_oid_get_numeric_string (https://github.com/Mbed-TLS/mbedtls/blob/v3.4.0/library/oid.c#L864).

However, it appears that ATF libc's snprintf doesn't support%c format, as mbedtls_oid_get_numeric_string returns an erroneous oid.

in get_ext oid_str dump

(mbedtls_oid_get_numeric_string) oid_str=%c.49.6.1.4.1.4128.2100.1
oid_str=1.3.6.1.4.1.4128.2100.1 (TRUSTED_FW_NVCOUNTER_OID)

I try to change snprintf format %c to %u in mbedtls_oid_get_numeric_string, TF-A boots successfully

elastic man

Thanks.

Event Timeline

• stevenpalomi created this task.Jun 19 2023, 6:40 AM
• stevenpalomi updated the task description. (Show Details)
• Cloudsicker added a subscriber: • Cloudsicker.Mar 2 2024, 8:30 PM

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