lldbinit/tests/sysctl.c at v3.2 · gdbinit/lldbinit

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// test sysctl anti-debug trick

#include <assert.h>

#include <stdbool.h>

#include <sys/types.h>

#include <unistd.h>

#include <sys/sysctl.h>

#include <stdio.h>

#include <stdlib.h>

// Returns true if the current process is being debugged (either

// running under the debugger or has a debugger attached post facto).

static bool AmIBeingDebugged(void) {

int junk;

int mib[4];

struct kinfo_proc info;

size_t size;

// Initialize the flags so that, if sysctl fails for some bizarre

// reason, we get a predictable result.

info.kp_proc.p_flag = 0;

// Initialize mib, which tells sysctl the info we want, in this case

// we're looking for information about a specific process ID.

mib[0] = CTL_KERN; // 1

mib[1] = KERN_PROC; // 14

mib[2] = KERN_PROC_PID; // 1

mib[3] = getpid();

// Call sysctl.

size = sizeof(info);

junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);

assert(junk == 0);

// We're being debugged if the P_TRACED flag (0x00000800) is set.

if ((info.kp_proc.p_flag & P_TRACED) != 0) {

printf("ALERT: Debugger found :-(\n");

exit(1);

}

printf("No debugger found :-)\n");

return 0;

}

int main(void) {

AmIBeingDebugged();

return 0;

}