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Improve stack overflow recovery

Browse source 
It's now possible to use sigaltstack() to recover from stack overflows
on Windows. Several bugs in sigaltstack() have been fixed, for all our
supported platforms. There's a newer better example showing how to use
this, along with three independent unit tests just to further showcase
the various techniques.
This commit is contained in:
Justine Tunney 2023-10-04 07:07:43 -07:00
parent 1694edf85c
commit 4631d34d0d
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
24 changed files with 590 additions and 274 deletions
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15
libc/intrin/describebacktrace.c
View file

@ -24,20 +24,19 @@
dontinstrument const char *(DescribeBacktrace)(char buf[N],
struct StackFrame *fr) {
bool gotsome = false;
char *p = buf;
char *pe = p + N;
bool gotsome = false;
while (fr) {
if (gotsome) {
if (p + 1 < pe) {
if (p + 16 + 1 + 1 <= pe) {
if (gotsome) {
*p++ = ' ';
*p = 0;
} else {
gotsome = true;
}
} else {
gotsome = true;
}
if (p + 17 <= pe) {
p = __hexcpy(p, fr->addr);
} else {
break;
}
fr = fr->next;
}

2
libc/intrin/getmainstack.c
View file

@ -103,7 +103,7 @@ void __get_main_stack(void **out_addr, size_t *out_size, int *out_guardsize) {
if (IsWindows()) {
*out_addr = (void *)GetStaticStackAddr(0);
*out_size = GetStaticStackSize();
*out_guardsize = 4096;
*out_guardsize = GetGuardSize();
return;
}
int pagesz = getauxval(AT_PAGESZ);

2
libc/intrin/strace.internal.h
View file

@ -3,7 +3,7 @@
#include "libc/intrin/likely.h"
#include "libc/runtime/runtime.h"
#define _NTTRACE 1 /* not configurable w/ flag yet */
#define _NTTRACE 0 /* not configurable w/ flag yet */
#define _POLLTRACE 0 /* not configurable w/ flag yet */
#define _DATATRACE 1 /* not configurable w/ flag yet */
#define _LOCKTRACE 0 /* not configurable w/ flag yet */

21
libc/intrin/wantcrashreports.c
View file

@ -1,21 +0,0 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/log/internal.h"
bool _wantcrashreports;