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Red Hat Bugzilla – Attachment 926487 Details for
Bug 786837
rngd does not check status when communicating with the TPM
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[patch]
patch to check tpm return code
rngd.patch (text/plain), 972 bytes, created by
Neil Horman
on 2014-08-13 15:30:49 UTC
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Description:
patch to check tpm return code
Filename:
MIME Type:
Creator:
Neil Horman
Created:
2014-08-13 15:30:49 UTC
Size:
972 bytes
patch
obsolete
>diff -up ./rngd_entsource.c.tpm ./rngd_entsource.c >--- ./rngd_entsource.c.tpm 2014-08-13 11:20:34.908788976 -0400 >+++ ./rngd_entsource.c 2014-08-13 11:27:37.350769043 -0400 >@@ -85,6 +85,7 @@ int xread_tpm(void *buf, size_t size, st > 0, 0, 0, 0, /* number of bytes to return */ > }; > char *offset; >+ int *tpm_return = NULL; > > ent_src->rng_fd = open(ent_src->rng_name, O_RDWR); > if (ent_src->rng_fd == -1) { >@@ -125,6 +126,16 @@ int xread_tpm(void *buf, size_t size, st > goto error_out; > } > r = read(ent_src->rng_fd, temp_buf,size); >+ /* >+ * check the return code of the command to make sure >+ * the rng is working properly >+ * The return code is 6 bytes into the output header >+ */ >+ tpm_return = (int *)(temp_buf + 6); >+ retval = *tpm_return; >+ if (retval) >+ goto error_out; >+ > r = (r - TPM_GET_RNG_OVERHEAD); > bytes_read = bytes_read + r; > if (bytes_read > size) {
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bug 786837
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