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Improve upon the new pledge command

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Justine Tunney 2022-07-14 04:32:33 -07:00
parent b707fca77a
commit 1d744ea11b
13 changed files with 382 additions and 64 deletions
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59
test/libc/nexgen32e/stackrw_test.c Normal file
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/*-*- 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/calls/struct/sigaction.h"
#include "libc/intrin/kprintf.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
/**
* @fileoverview test non-executable stack is default
*/
jmp_buf jb;
void EscapeSegfault(int sig) {
longjmp(jb, 666);
}
TEST(xstack, test) {
struct sigaction old[2];
struct sigaction sa = {
.sa_handler = EscapeSegfault,
.sa_flags = SA_NODEFER,
};
sigaction(SIGSEGV, &sa, old + 0);
sigaction(SIGBUS, &sa, old + 1);
char code[16] = {
0x55, // push %rbp
0xb8, 0007, 0x00, 0x00, 0x00, // mov $7,%eax
0x5d, // push %rbp
0xc3, // ret
};
int (*func)(void) = (void *)code;
int rc;
if (!(rc = setjmp(jb))) {
func();
abort();
}
ASSERT_EQ(666, rc);
sigaction(SIGBUS, old + 1, 0);
sigaction(SIGSEGV, old + 0, 0);
}