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87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
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* Copyright (C) 2018 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Test sample code to check for leftovers from secure table loading in
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* userspace memory (initial sample provided by Milan Broz).
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*
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* Compile with: gcc -O2 -g -o tst dmcrypt.c -ldevmapper
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*
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* Search for string in coredump (needs 'raise', or using 'gcore' tool)
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*
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* grep "434e0cbab02ca68ffba9268222c3789d703fe62427b78b308518b3228f6a2122" core
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*
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*/
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#include "device_mapper/all.h"
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#include <unistd.h>
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#include <signal.h>
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/* Comment out this define to get coredump instead of sleeping */
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#define SLEEP 1
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static void rot13(char *s)
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{
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unsigned i;
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for (i = 0; s[i]; i++)
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if (s[i] >= 'a' && s[i] <= 'm')
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s[i] += 13;
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else if (s[i] >= 'n' && s[i] <= 'z')
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s[i] -= 13;
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}
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int main (int argc, char *argv[])
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{
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const unsigned sz = 8192;
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/* rot13: 434e0cbab02ca68ffba9268222c3789d703fe62427b78b308518b3228f6a2122 */
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char aes[] = "434r0pono02pn68sson9268222p3789q703sr62427o78o308518o3228s6n2122";
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const char *device = (argc > 1) ? argv[1] : "/dev/loop0"; /* device for use */
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const char *devname = (argc > 2) ? argv[2] : "test-secure"; /* name of dm device */
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uint32_t cookie = 0;
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char table[300];
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struct dm_task *dmt;
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if (geteuid() != 0) {
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fprintf(stderr, "Needs root UID for execution!\n");
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exit(1);
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}
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printf("Going to create %s dm device using backend device: %s\n", devname, device);
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if ((dmt = dm_task_create(DM_DEVICE_CREATE))) {
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(void) dm_task_set_name(dmt, devname);
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(void) dm_task_secure_data(dmt);
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rot13(aes);
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snprintf(table, sizeof(table), "aes-xts-plain64 %s 0 %s %u", aes, device, sz);
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memset(aes, 0, sizeof(aes));
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(void) dm_task_add_target(dmt, 0, sz, "crypt", table);
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memset(table, 0, sizeof(table));
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asm volatile ("" ::: "memory");/* Compiler barrier. */
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(void) dm_task_set_cookie(dmt, &cookie, DM_UDEV_DISABLE_LIBRARY_FALLBACK);
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(void) dm_task_run(dmt);
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(void) dm_task_destroy(dmt);
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}
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dm_task_update_nodes();
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/* At this point there should be no memory trace from a secure table line */
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#ifdef SLEEP
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sleep(4); /* Give time to other process to capture 'gcore pid' */
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#else
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raise(SIGABRT); /* Generate core for search of any forgotten traces of key */
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#endif
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return 0;
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}
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