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Add mmap + shmdt test

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Stefanos Kornilios Misis Poiitidis 2022-04-06 16:33:13 +03:00
parent 00fdbfdbfc
commit 33d59ee83a
2 changed files with 55 additions and 0 deletions
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smc-shmatdt Executable file
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src/smc-shmatdt.cpp Normal file
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#include <sys/mman.h>
#include <cstdio>
#include <cstdint>
#include <sys/shm.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <assert.h>
#include <sys/wait.h>
void test(char* code, const char* name) {
code[0] = 0xB8;
code[1] = 0xAA;
code[2] = 0xBB;
code[3] = 0xCC;
code[4] = 0xDD;
code[5] = 0xC3;
auto fn = (int(*)())code;
auto e1 = fn();
code[3]=0xFE;
auto e2 = fn();
mprotect(code, 4096, PROT_READ | PROT_EXEC);
mprotect(code, 4096, PROT_READ | PROT_WRITE | PROT_EXEC);
code[3] = 0xF3;
mprotect(code, 4096, PROT_READ | PROT_EXEC);
auto e3 = fn();
mprotect(code, 4096, PROT_READ | PROT_WRITE | PROT_EXEC);
code[3] = 0xF1;
auto e4 = fn();
printf("%s-1: %X, %s\n", name, e1, e1 != 0xDDCCBBAA? "FAIL" : "PASS");
printf("%s-2: %X, %s\n", name, e2, e2 != 0xDDFEBBAA? "FAIL" : "PASS");
printf("%s-3: %X, %s\n", name, e3, e3 != 0xDDF3BBAA? "FAIL" : "PASS");
printf("%s-4: %X, %s\n", name, e4, e4 != 0xDDF1BBAA? "FAIL" : "PASS");
}
int main() {
auto shmid = shmget(IPC_PRIVATE, 4096 * 3, IPC_CREAT | 0777);
auto ptrshm = (char*)shmat(shmid, 0, 0);
shmctl(shmid, IPC_RMID, NULL);
auto ptrmmap = (char*)mmap(ptrshm + 4096, 4096, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_ANON, 0, 0);
shmdt(ptrshm);
test(ptrmmap, "mmap+shmdt");
return 0;
}