swtpm_ioctl: Repeatedly call PTM_GET_INFO for long responses
Fix the display of long responses that require calling PTM_GET_INFO
multiple times to get parts of the response from increasing offsets
until the whole response has been received.
Long responses are only returned when libtpms has profiles support and
several flags are passed to PTM_GET_INFO.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
diff --git a/src/swtpm_ioctl/tpm_ioctl.c b/src/swtpm_ioctl/tpm_ioctl.c
index 6c513ad..df1d877 100644
--- a/src/swtpm_ioctl/tpm_ioctl.c
+++ b/src/swtpm_ioctl/tpm_ioctl.c
@@ -1302,24 +1302,43 @@
devtoh32(is_chardev, psbs.u.resp.minsize),
devtoh32(is_chardev, psbs.u.resp.maxsize));
} else if (!strcmp(command, "--info")) {
+ char buffer[sizeof(pgi.u.resp.buffer) + 1];
+ uint32_t bytes_read = 0;
+ uint32_t len;
+
memset(&pgi, 0, sizeof(pgi));
- pgi.u.req.flags = htodev64(is_chardev, info_flags);
- pgi.u.req.offset = htodev64(is_chardev, 0);
- n = ctrlcmd(fd, PTM_GET_INFO, &pgi,
- sizeof(pgi.u.req), sizeof(pgi.u.resp));
- if (n < 0) {
- fprintf(stderr,
- "Could not execute PTM_GET_INFO: %s\n",
- strerror(errno));
- goto exit;
- }
- res = devtoh32(is_chardev, pgi.u.resp.tpm_result);
- if (res != 0) {
- fprintf(stderr,
- "TPM result from PTM_GET_INFO: 0x%x\n", res);
- goto exit;
- }
- printf("%s\n", pgi.u.resp.buffer);
+ do {
+ pgi.u.req.flags = htodev64(is_chardev, info_flags);
+ pgi.u.req.offset = htodev32(is_chardev, bytes_read);
+ n = ctrlcmd(fd, PTM_GET_INFO, &pgi,
+ sizeof(pgi.u.req), sizeof(pgi.u.resp));
+ if (n < 0) {
+ fprintf(stderr,
+ "Could not execute PTM_GET_INFO: %s\n",
+ strerror(errno));
+ goto exit;
+ }
+ res = devtoh32(is_chardev, pgi.u.resp.tpm_result);
+ if (res != 0) {
+ fprintf(stderr,
+ "TPM result from PTM_GET_INFO: 0x%x\n", res);
+ goto exit;
+ }
+
+ len = devtoh32(is_chardev, pgi.u.resp.length);
+ if (len > sizeof(pgi.u.resp.buffer)) {
+ fprintf(stderr,
+ "TPM returned an invalid length of %u, expected maximum %zu\n",
+ len, sizeof(pgi.u.resp.buffer));
+ goto exit;
+ }
+ bytes_read += len;
+
+ memcpy(buffer, pgi.u.resp.buffer, len);
+ buffer[len] = 0;
+ printf("%s", buffer);
+ } while (bytes_read < devtoh32(is_chardev, pgi.u.resp.totlength));
+ printf("\n");
} else if (!strcmp(command, "--lock-storage")) {
memset(&pls, 0, sizeof(pls));
pls.u.req.retries = htodev32(is_chardev, 0);
