mirror of
https://github.com/jart/cosmopolitan.git
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85 lines
3.6 KiB
C
85 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 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/calls/struct/sigaltstack.h"
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#include "libc/calls/struct/siginfo.h"
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#include "libc/calls/struct/ucontext.internal.h"
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#include "libc/calls/ucontext.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/limits.h"
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#include "libc/mem/gc.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/sysconf.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/sysv/consts/ss.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/thread.h"
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/**
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* stack overflow recovery technique #4
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* just call pthread_exit() and let the thread die
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*/
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volatile bool smashed_stack;
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void CrashHandler(int sig) {
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smashed_stack = true;
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pthread_exit((void *)123L);
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}
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int StackOverflow(int d) {
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char A[8];
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for (int i = 0; i < sizeof(A); i++)
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A[i] = d + i;
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if (__veil("r", d))
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return StackOverflow(d + 1) + A[d % sizeof(A)];
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return 0;
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}
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void *MyPosixThread(void *arg) {
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struct sigaction sa;
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struct sigaltstack ss;
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ss.ss_flags = 0;
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ss.ss_size = sysconf(_SC_MINSIGSTKSZ) + 4096;
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ss.ss_sp = gc(malloc(ss.ss_size));
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ASSERT_SYS(0, 0, sigaltstack(&ss, 0));
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sa.sa_flags = SA_SIGINFO | SA_ONSTACK; // <-- important
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = CrashHandler;
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sigaction(SIGBUS, &sa, 0);
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sigaction(SIGSEGV, &sa, 0);
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exit(StackOverflow(0));
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return 0;
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}
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TEST(stackoverflow, standardStack_altStack_thread_teleport) {
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void *res;
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pthread_t th;
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struct sigaltstack ss;
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smashed_stack = false;
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pthread_create(&th, 0, MyPosixThread, 0);
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pthread_join(th, &res);
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ASSERT_EQ((void *)123L, res);
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ASSERT_TRUE(smashed_stack);
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// this should be SS_DISABLE but ShowCrashReports() creates an alt stack
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ASSERT_SYS(0, 0, sigaltstack(0, &ss));
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ASSERT_EQ(0, ss.ss_flags);
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}
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