54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
#define _GNU_SOURCE /* See feature_test_macros(7) */
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "util.h"
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#define DEBUG
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int sz_mem[] = {
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4 * (1ULL<<10),
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2 * (1ULL<<20),
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1 * (1ULL<<30),
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134217728};
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#define SZ_INDEX 0
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#define NUM_AREAS 1
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int main(int argc, char **argv)
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{
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void *mem;
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int ret = 0;
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int fd;
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fd = open("./file", O_RDWR);
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CHKANDJUMP(fd == -1, 255, "open failed\n");
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mem = mmap(0, 3 * sz_mem[SZ_INDEX], PROT_READ | PROT_WRITE,
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MAP_PRIVATE, fd, 0);
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CHKANDJUMP(mem == MAP_FAILED, 255, "mmap failed\n");
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*(unsigned long *)((char *)mem + 0) = 0x123456789abcdef0;
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*(unsigned long *)((char *)mem + sz_mem[SZ_INDEX]) =
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0xbeefbeefbeefbeef;
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*(unsigned long *)((char *)mem + 2 * sz_mem[SZ_INDEX]) =
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0xbeefbeefbeefbeef;
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ret = mprotect(mem + sz_mem[SZ_INDEX], sz_mem[SZ_INDEX],
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PROT_READ | PROT_WRITE | PROT_EXEC);
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CHKANDJUMP(ret != 0, 255, "mprotect failed\n");
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munmap(mem, 3 * sz_mem[SZ_INDEX]);
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fn_exit:
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return ret;
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fn_fail:
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goto fn_exit;
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}
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