From: AKASHI Takahiro takahiro.akashi@linaro.org
Since the size check against an entry in efi_search_siglist() is incorrect, this function will never find out a to-be-matched certificate and its associated revocation time in the signature list.
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- lib/efi_loader/efi_signature.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/lib/efi_loader/efi_signature.c b/lib/efi_loader/efi_signature.c index e05c471c61..cd2df46264 100644 --- a/lib/efi_loader/efi_signature.c +++ b/lib/efi_loader/efi_signature.c @@ -433,10 +433,11 @@ static bool efi_search_siglist(struct x509_certificate *cert, * time64_t revocation_time; * }; */ - if ((sig_data->size == SHA256_SUM_LEN) && - !memcmp(sig_data->data, hash, SHA256_SUM_LEN)) { + if ((sig_data->size >= SHA256_SUM_LEN + sizeof(time64_t)) && + !memcmp(sig_data->data, msg, SHA256_SUM_LEN)) { memcpy(revoc_time, sig_data->data + SHA256_SUM_LEN, sizeof(*revoc_time)); + EFI_PRINT("revocation time: 0x%llx\n", *revoc_time); found = true; goto out; } -- 2.27.0