mirror of https://github.com/t1meshift/os_labs.git
28 lines
531 B
C
28 lines
531 B
C
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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 <signal.h>
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#ifdef HANDLE_SIGSEGV
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void on_sigsegv() {
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printf("SIGSEGV\nNull pointer dereference gives UB.\n");
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exit(0);
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}
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#endif
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int main() {
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#ifdef HANDLE_SIGSEGV
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struct sigaction action;
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memset(&action, 0, sizeof(action));
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action.sa_flags = SA_SIGINFO;
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action.sa_sigaction = on_sigsegv;
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sigaction(SIGSEGV, &action, NULL);
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#endif
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// Dereference NULL
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int *p = NULL;
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//(*p)(); // Calling a function from 0x0, yay!
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int a = *p;
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return 0;
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}
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