0ffefb8a4d
hmac_sha256() leaves four stack buffers containing key-derived material (inner_padding, outer_padding, replacement_key, hash state) on the stack after returning. The inner_padding and outer_padding arrays contain key XOR 0x36 and key XOR 0x5c respectively, which are trivially reversible to recover the original HMAC key. This function is called with security-sensitive keys including the LUKS volume key (cryptsetup-util.c), TPM2 PIN (tpm2-util.c), and boot secret (tpm2-swtpm.c). The key material persists on the stack until overwritten by later unrelated function calls. Add CLEANUP_ERASE() to all four local buffers, following the same pattern applied to tpm2-util.c in commit 6c80ce6 (PR #41394).
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