From: Heinrich Schuchardt Date: Wed, 1 Jul 2020 10:44:00 +0000 (+0200) Subject: efi_loader: add missing validation of timestamp X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=33f183f68b76226a1053694418d2c283371bee72;p=u-boot.git efi_loader: add missing validation of timestamp The UEFI specification requires that when UEFI variables are set using time based authentication we have to check that unused fields of the timestamp are zero Signed-off-by: Heinrich Schuchardt --- diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c index 74a9c65402..f9a0efd427 100644 --- a/lib/efi_loader/efi_variable.c +++ b/lib/efi_loader/efi_variable.c @@ -481,11 +481,15 @@ static efi_status_t efi_variable_authenticate(u16 *variable, if (guidcmp(&auth->auth_info.cert_type, &efi_guid_cert_type_pkcs7)) goto err; + memcpy(×tamp, &auth->time_stamp, sizeof(timestamp)); + if (timestamp.pad1 || timestamp.nanosecond || timestamp.timezone || + timestamp.daylight || timestamp.pad2) + goto err; + *data += sizeof(auth->time_stamp) + auth->auth_info.hdr.dwLength; *data_size -= (sizeof(auth->time_stamp) + auth->auth_info.hdr.dwLength); - memcpy(×tamp, &auth->time_stamp, sizeof(timestamp)); memset(&tm, 0, sizeof(tm)); tm.tm_year = timestamp.year; tm.tm_mon = timestamp.month;