mirror of
https://github.com/jart/cosmopolitan.git
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58 lines
2.7 KiB
C
58 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/sigaction.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/testlib/testlib.h"
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/**
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* @fileoverview test non-executable stack is default
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*/
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jmp_buf jb;
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void EscapeSegfault(int sig) {
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longjmp(jb, 666);
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}
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TEST(xstack, test) {
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struct sigaction old[2];
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struct sigaction sa = {
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.sa_handler = EscapeSegfault,
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.sa_flags = SA_NODEFER,
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};
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sigaction(SIGSEGV, &sa, old + 0);
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sigaction(SIGBUS, &sa, old + 1);
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char code[16] = {
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0x55, // push %rbp
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0xb8, 0007, 0x00, 0x00, 0x00, // mov $7,%eax
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0x5d, // push %rbp
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0xc3, // ret
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};
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int (*func)(void) = (void *)code;
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int rc;
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if (!(rc = setjmp(jb))) {
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func();
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abort();
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}
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ASSERT_EQ(666, rc);
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sigaction(SIGBUS, old + 1, 0);
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sigaction(SIGSEGV, old + 0, 0);
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}
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