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ima-evm-utils: Prevent crash if pcr is invalid

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If the pcr is invalid, evmctl will crash while accessing
an invalid memory address.  Verify the pcr is in the
expected range.

Also, correct range of an existing check.

Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Frank Sorenson
2021-02-12 11:58:22 -06:00
committed by Mimi Zohar
parent 8cbf05fcde
commit 74ea78d4f2
1 changed files with 6 additions and 1 deletions
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7
src/evmctl.c
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@@ -2023,6 +2023,11 @@ static int ima_measurement(const char *file)
while (fread(&entry.header, sizeof(entry.header), 1, fp)) {
entry_num++;
if (entry.header.pcr >= NUM_PCRS) {
log_err("Invalid PCR %d.\n", entry.header.pcr);
fclose(fp);
exit(1);
}
if (entry.header.name_len > TCG_EVENT_NAME_LEN_MAX) {
log_err("%d ERROR: event name too long!\n",
entry.header.name_len);
@@ -2243,7 +2248,7 @@ static int read_binary_bios_measurements(char *file, struct tpm_bank_info *bank)
log_info("%02u ", event.header.pcr);
log_dump(event.header.digest, SHA_DIGEST_LENGTH);
}
if (event.header.pcr > NUM_PCRS) {
if (event.header.pcr >= NUM_PCRS) {
log_err("Invalid PCR %d.\n", event.header.pcr);
err = 1;
break;