1609eee66a
Waiting for gdb attach is not useful/expected for normal use and has a tendendency to create hanging qemu instances.
129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
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#include <execinfo.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "qemu/osdep.h"
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#include "nyx/debug.h"
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#include "signal.h"
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#ifdef ENABLE_BACKTRACES
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#define BT_BUF_SIZE 100
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void qemu_backtrace(void)
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{
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void *buffer[BT_BUF_SIZE];
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int nptrs = 0;
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int j;
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nptrs = backtrace(buffer, BT_BUF_SIZE);
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fprintf(stderr, "backtrace() returned %d addresses\n", nptrs);
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char **strings = backtrace_symbols(buffer, nptrs);
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if (strings == NULL) {
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fprintf(stderr, "backtrace_symbols failed!\n");
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return;
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// exit(EXIT_FAILURE);
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}
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for (j = 0; j < nptrs; j++)
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fprintf(stderr, "%s\n", strings[j]);
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free(strings);
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}
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static void sigsegfault_handler(int signo, siginfo_t *info, void *extra)
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{
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fprintf(stderr, "[qemu-nyx] crash detected (pid: %d / signal: %d)\n", getpid(),
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signo);
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qemu_backtrace();
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#ifdef NYX_DEBUG
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fprintf(stderr, "WAITING FOR GDB ATTACH (PID: %d...\n", getpid());
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while (1) {
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sleep(1);
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}
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#endif /* NYX_DEBUG */
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}
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static void sigabrt_handler(int signo, siginfo_t *info, void *extra)
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{
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fprintf(stderr, "[qemu-nyx] crash detected (pid: %d / signal: %d)\n", getpid(),
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signo);
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qemu_backtrace();
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#ifdef NYX_DEBUG
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fprintf(stderr, "WAITING FOR GDB ATTACH (PID: %d...\n", getpid());
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while (1) {
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sleep(1);
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}
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#endif /* NYX_DEBUG */
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}
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static void sigint_handler(int signo, siginfo_t *info, void *extra)
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{
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fprintf(stderr, "[qemu-nyx] bye! (pid: %d / signal: %d)\n", getpid(), signo);
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exit(0);
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}
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void init_crash_handler(void)
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{
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struct sigaction action;
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action.sa_flags = SA_SIGINFO;
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action.sa_sigaction = sigsegfault_handler;
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if (sigaction(SIGSEGV, &action, NULL) == -1) {
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fprintf(stderr, "SIGSEGV: sigaction failed");
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_exit(1);
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}
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action.sa_sigaction = sigabrt_handler;
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if (sigaction(SIGABRT, &action, NULL) == -1) {
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fprintf(stderr, "SIGABRT: sigaction failed");
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_exit(1);
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}
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/* don't install a SIGINT handler if the nyx block cow cache layer is disabled */
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if (!getenv("NYX_DISABLE_BLOCK_COW")) {
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action.sa_sigaction = sigint_handler;
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if (sigaction(SIGINT, &action, NULL) == -1) {
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fprintf(stderr, "SIGINT: sigaction failed");
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_exit(1);
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}
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}
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}
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void hexdump_kafl(const void *data, size_t size)
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{
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char ascii[17];
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size_t i, j;
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ascii[16] = '\0';
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for (i = 0; i < size; ++i) {
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printf("%02X ", ((unsigned char *)data)[i]);
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if (((unsigned char *)data)[i] >= ' ' && ((unsigned char *)data)[i] <= '~') {
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ascii[i % 16] = ((unsigned char *)data)[i];
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} else {
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ascii[i % 16] = '.';
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}
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if ((i + 1) % 8 == 0 || i + 1 == size) {
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printf(" ");
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if ((i + 1) % 16 == 0) {
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printf("| %s \n", ascii);
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} else if (i + 1 == size) {
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ascii[(i + 1) % 16] = '\0';
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if ((i + 1) % 16 <= 8) {
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printf(" ");
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}
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for (j = (i + 1) % 16; j < 16; ++j) {
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printf(" ");
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}
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printf("| %s \n", ascii);
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}
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}
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}
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}
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#endif
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