/*
* Verify redzones.
* This function is called on free() and realloc().
*/
void
redzone_check(caddr_t naddr)
{
struct stack ast, fst;
caddr_t haddr, faddr;
u_int ncorruptions;
u_long nsize;
int i;
haddr = naddr - REDZONE_HSIZE;
bcopy(haddr, &ast, sizeof(ast));
haddr += sizeof(ast);
bcopy(haddr, &nsize, sizeof(nsize));
haddr += sizeof(nsize);
atomic_subtract_long(&redzone_extra_mem,
redzone_size_ntor(nsize) - nsize);
/* Look for buffer underflow. */
ncorruptions = 0;
for (i = 0; i < REDZONE_CHSIZE; i++, haddr++) {
if (*(u_char *)haddr != 0x42)
ncorruptions++;
}
if (ncorruptions > 0) {
printf("REDZONE: Buffer underflow detected. %u byte%s "
"corrupted before %p (%lu bytes allocated).\n",
ncorruptions, ncorruptions == 1 ? "" : "s", naddr, nsize);
printf("Allocation backtrace:\n");
stack_print_ddb(&ast);
printf("Free backtrace:\n");
stack_save(&fst);
stack_print_ddb(&fst);
if (redzone_panic)
panic("Stopping here.");
}
faddr = naddr + nsize;
/* Look for buffer overflow. */
ncorruptions = 0;
for (i = 0; i < REDZONE_CFSIZE; i++, faddr++) {
if (*(u_char *)faddr != 0x42)
ncorruptions++;
}
if (ncorruptions > 0) {
printf("REDZONE: Buffer overflow detected. %u byte%s corrupted "
"after %p (%lu bytes allocated).\n", ncorruptions,
ncorruptions == 1 ? "" : "s", naddr + nsize, nsize);
printf("Allocation backtrace:\n");
stack_print_ddb(&ast);
printf("Free backtrace:\n");
stack_save(&fst);
stack_print_ddb(&fst);
if (redzone_panic)
panic("Stopping here.");
}
}
void
kdb_backtrace(void)
{
if (kdb_dbbe != NULL && kdb_dbbe->dbbe_trace != NULL) {
printf("KDB: stack backtrace:\n");
kdb_dbbe->dbbe_trace();
}
#ifdef STACK
else {
struct stack st;
printf("KDB: stack backtrace:\n");
stack_save(&st);
stack_print_ddb(&st);
}
#endif
}
/*
* Similar to kdb_backtrace() except that it prints a backtrace of an
* arbitrary thread rather than the calling thread.
*/
void
kdb_backtrace_thread(struct thread *td)
{
if (kdb_dbbe != NULL && kdb_dbbe->dbbe_trace_thread != NULL) {
printf("KDB: stack backtrace of thread %d:\n", td->td_tid);
kdb_dbbe->dbbe_trace_thread(td);
}
#ifdef STACK
else {
struct stack st;
printf("KDB: stack backtrace of thread %d:\n", td->td_tid);
stack_zero(&st);
stack_save_td(&st, td);
stack_print_ddb(&st);
}
#endif
}
