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verify_pcr_export: bump kenv_mvallen if needed
The loader.ve.hashed list can easily exceed KENV_MVALLEN. If so, bump kenv_mvallen to a multiple of KENV_MVALLEN to accommodate the value. Reviewed by: stevek MFC after: 1 week
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parent
8cc8c5864a
commit
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=362127
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@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <string.h>
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#include <sys/queue.h>
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#include <sys/kenv.h>
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#include "libsecureboot.h"
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#include <verify_file.h>
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@ -532,6 +533,19 @@ verify_pcr_export(void)
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DEBUG_PRINTF(1,
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("%s: setenv(loader.ve.hashed, %s\n",
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__func__, hinfo));
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if ((hlen = strlen(hinfo)) > KENV_MVALLEN) {
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/*
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* bump kenv_mvallen
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* roundup to multiple of KENV_MVALLEN
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*/
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char mvallen[16];
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hlen += KENV_MVALLEN -
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(hlen % KENV_MVALLEN);
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if (snprintf(mvallen, sizeof(mvallen),
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"%d", (int) hlen) < sizeof(mvallen))
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setenv("kenv_mvallen", mvallen, 1);
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}
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free(hinfo);
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}
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}
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