68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#define GB (1024 * 1024 * 1024)
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#define MAP_SIZE (1 * GB)
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int main(int argc, char **argv)
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{
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int rc, ret;
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void *addr1, *addr2;
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stack_t *ss, *oss;
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ssize_t stack_t_size = sizeof(stack_t);
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addr1 = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (addr1 == MAP_FAILED) {
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ret = -1;
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perror("failed to mmap 1st: ");
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goto out;
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}
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addr2 = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (addr2 == MAP_FAILED) {
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ret = -1;
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perror("failed to mmap 2nd: ");
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goto out;
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}
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oss = addr1 + MAP_SIZE - stack_t_size;
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memset(oss, '0', stack_t_size);
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ss = addr2 + MAP_SIZE - stack_t_size;
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memset(ss, '0', stack_t_size);
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rc = sigaltstack(NULL, oss);
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if (rc == 0) {
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printf("[OK] sigaltstack 1st is successful\n");
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}
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else {
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ret = -1;
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perror("[NG] failed to sigaltstack 1st: ");
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goto out;
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}
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ss->ss_sp = oss->ss_sp;
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ss->ss_flags = oss->ss_flags;
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ss->ss_size = oss->ss_size;
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rc = sigaltstack(ss, NULL);
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if (rc == 0) {
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printf("[OK] sigaltstack 2nd is successful\n");
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}
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else {
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ret = -1;
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perror("[NG] failed to sigaltstack 2nd: ");
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goto out;
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}
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out:
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return ret;
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}
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