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cosmopolitan/test/libc/log/backtrace_test.c
Justine Tunney ec480f5aa0
Make improvements 
- Every unit test now passes on Apple Silicon. The final piece of this
  puzzle was porting our POSIX threads cancelation support, since that
  works differently on ARM64 XNU vs. AMD64. Our semaphore support on
  Apple Silicon is also superior now compared to AMD64, thanks to the
  grand central dispatch library which lets *NSYNC locks go faster.

- The Cosmopolitan runtime is now more stable, particularly on Windows.
  To do this, thread local storage is mandatory at all runtime levels,
  and the innermost packages of the C library is no longer being built
  using ASAN. TLS is being bootstrapped with a 128-byte TIB during the
  process startup phase, and then later on the runtime re-allocates it
  either statically or dynamically to support code using _Thread_local.
  fork() and execve() now do a better job cooperating with threads. We
  can now check how much stack memory is left in the process or thread
  when functions like kprintf() / execve() etc. call alloca(), so that
  ENOMEM can be raised, reduce a buffer size, or just print a warning.

- POSIX signal emulation is now implemented the same way kernels do it
  with pthread_kill() and raise(). Any thread can interrupt any other
  thread, regardless of what it's doing. If it's blocked on read/write
  then the killer thread will cancel its i/o operation so that EINTR can
  be returned in the mark thread immediately. If it's doing a tight CPU
  bound operation, then that's also interrupted by the signal delivery.
  Signal delivery works now by suspending a thread and pushing context
  data structures onto its stack, and redirecting its execution to a
  trampoline function, which calls SetThreadContext(GetCurrentThread())
  when it's done.

- We're now doing a better job managing locks and handles. On NetBSD we
  now close semaphore file descriptors in forked children. Semaphores on
  Windows can now be canceled immediately, which means mutexes/condition
  variables will now go faster. Apple Silicon semaphores can be canceled
  too. We're now using Apple's pthread_yield() funciton. Apple _nocancel
  syscalls are now used on XNU when appropriate to ensure pthread_cancel
  requests aren't lost. The MbedTLS library has been updated to support
  POSIX thread cancelations. See tool/build/runitd.c for an example of
  how it can be used for production multi-threaded tls servers. Handles
  on Windows now leak less often across processes. All i/o operations on
  Windows are now overlapped, which means file pointers can no longer be
  inherited across dup() and fork() for the time being.

- We now spawn a thread on Windows to deliver SIGCHLD and wakeup wait4()
  which means, for example, that posix_spawn() now goes 3x faster. POSIX
  spawn is also now more correct. Like Musl, it's now able to report the
  failure code of execve() via a pipe although our approach favors using
  shared memory to do that on systems that have a true vfork() function.

- We now spawn a thread to deliver SIGALRM to threads when setitimer()
  is used. This enables the most precise wakeups the OS makes possible.

- The Cosmopolitan runtime now uses less memory. On NetBSD for example,
  it turned out the kernel would actually commit the PT_GNU_STACK size
  which caused RSS to be 6mb for every process. Now it's down to ~4kb.
  On Apple Silicon, we reduce the mandatory upstream thread size to the
  smallest possible size to reduce the memory overhead of Cosmo threads.
  The examples directory has a program called greenbean which can spawn
  a web server on Linux with 10,000 worker threads and have the memory
  usage of the process be ~77mb. The 1024 byte overhead of POSIX-style
  thread-local storage is now optional; it won't be allocated until the
  pthread_setspecific/getspecific functions are called. On Windows, the
  threads that get spawned which are internal to the libc implementation
  use reserve rather than commit memory, which shaves a few hundred kb.

- sigaltstack() is now supported on Windows, however it's currently not
  able to be used to handle stack overflows, since crash signals are
  still generated by WIN32. However the crash handler will still switch
  to the alt stack, which is helpful in environments with tiny threads.

- Test binaries are now smaller. Many of the mandatory dependencies of
  the test runner have been removed. This ensures many programs can do a
  better job only linking the the thing they're testing. This caused the
  test binaries for LIBC_FMT for example, to decrease from 200kb to 50kb

- long double is no longer used in the implementation details of libc,
  except in the APIs that define it. The old code that used long double
  for time (instead of struct timespec) has now been thoroughly removed.

- ShowCrashReports() is now much tinier in MODE=tiny. Instead of doing
  backtraces itself, it'll just print a command you can run on the shell
  using our new `cosmoaddr2line` program to view the backtrace.

- Crash report signal handling now works in a much better way. Instead
  of terminating the process, it now relies on SA_RESETHAND so that the
  default SIG_IGN behavior can terminate the process if necessary.

- Our pledge() functionality has now been fully ported to AARCH64 Linux.
2023-09-18 21:04:47 -07:00

526 lines
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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 2021 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/assert.h"
#include "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/fmt/conv.h"
#include "libc/intrin/asan.internal.h"
#include "libc/limits.h"
#include "libc/log/libfatal.internal.h"
#include "libc/log/log.h"
#include "libc/mem/gc.h"
#include "libc/mem/mem.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/symbols.internal.h"
#include "libc/stdio/append.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
#include "libc/x/xasprintf.h"
#include "net/http/escape.h"
#ifdef __x86_64__
#if 0
__static_yoink("backtrace.com");
__static_yoink("backtrace.com.dbg");
void SetUpOnce(void) {
testlib_enable_tmp_setup_teardown_once();
ASSERT_NE(-1, mkdir("bin", 0755));
testlib_extract("/zip/backtrace.com", "bin/backtrace.com", 0755);
testlib_extract("/zip/backtrace.com.dbg", "bin/backtrace.com.dbg", 0755);
}
static bool OutputHasSymbol(const char *output, const char *s) {
return strstr(output, s) || (!FindDebugBinary() && strstr(output, "NULL"));
}
// UNFREED MEMORY
// o/dbg/test/libc/log/backtrace_test.com
// max allocated space 655,360
// total allocated space 80
// total free space 327,600
// releasable space 0
// mmaped space 65,360
// non-mmapped space 327,680
//
// 100080040020 64 bytes 5 used
// 421871 strdup
// 416529 MemoryLeakCrash
// 41666d SetUp
// 45428c testlib_runtestcases
//
// 00007fff0000-000080010000 rw-pa-F 2x shadow of 000000000000
// 000080070000-0000800a0000 rw-pa-F 3x shadow of 0000003c0000
// 02008fff0000-020090020000 rw-pa-F 3x shadow of 10007ffc0000
// 020090060000-020090080000 rw-pa-F 2x shadow of 100080340000
// 0e007fff0000-0e0080010000 rw-pa-F 2x shadow of 6ffffffc0000
// 100006560000-100006580000 rw-pa-F 2x shadow of 7ffc32b40000
// 100080000000-100080050000 rw-pa-- 5x automap w/ 50 frame hole
// 100080370000-100080390000 rw-pa-- 2x automap w/ 1 frame hole
// 1000803a0000-1000803b0000 rw-pa-- 1x automap
// 6ffffffe0000-700000000000 rw-paSF 2x stack
// # 24 frames mapped w/ 51 frames gapped
TEST(ShowCrashReports, testMemoryLeakCrash) {
size_t got;
ssize_t rc;
int ws, pid, fds[2];
char *output, buf[512];
if (!IsAsan()) {
/* TODO(jart): How can we make this work without ASAN? */
return;
}
ASSERT_NE(-1, pipe2(fds, O_CLOEXEC));
ASSERT_NE(-1, (pid = fork()));
if (!pid) {
dup2(fds[1], 1);
dup2(fds[1], 2);
execv("bin/backtrace.com", (char *const[]){"bin/backtrace.com", "6", 0});
_Exit(127);
}
close(fds[1]);
output = 0;
appends(&output, "");
for (;;) {
rc = read(fds[0], buf, sizeof(buf));
if (rc == -1) {
ASSERT_EQ(EINTR, errno);
continue;
}
if ((got = rc)) {
appendd(&output, buf, got);
} else {
break;
}
}
close(fds[0]);
ASSERT_NE(-1, wait(&ws));
// tinyprint(2, _gc(IndentLines(output, -1, 0, 4)), "\n", NULL);
EXPECT_EQ(78 << 8, ws);
ASSERT_TRUE(!!strstr(output, "UNFREED MEMORY"));
if (IsAsan()) {
ASSERT_TRUE(OutputHasSymbol(output, "strdup") &&
OutputHasSymbol(output, "MemoryLeakCrash"));
}
free(output);
}
// error: Uncaught SIGFPE (FPE_INTDIV) on nightmare pid 11724
// /home/jart/cosmo/o/dbg/test/libc/log/backtrace_test.com.tmp.11721
// ENOTTY[25]
// Linux nightmare SMP Thu, 12 Aug 2021 06:16:45 UTC
//
// 0x0000000000414659: FpuCrash at test/libc/log/backtrace_test.c:35
// 0x000000000045003b: testlib_runtestcases at libc/testlib/testrunner.c:98
// 0x000000000044b770: testlib_runalltests at libc/testlib/runner.c:37
// 0x000000000040278e: main at libc/testlib/testmain.c:86
// 0x0000000000403210: cosmo at libc/runtime/cosmo.S:65
// 0x0000000000402247: _start at libc/crt/crt.S:67
//
// RAX 0000000000000007 RBX 00006fffffffff10 RDI 00007ffe0745fde1 ST(0) 0.0
// RCX 0000000000000000 RDX 0000000000000000 RSI 0000000000489900 ST(1) 0.0
// RBP 00006fffffffff70 RSP 00006fffffffff10 RIP 000000000041465a ST(2) 0.0
// R8 0000000000000001 R9 00006ffffffffcc0 R10 00006ffffffffe60 ST(3) 0.0
// R11 000000000000000d R12 00000dffffffffe2 R13 00006fffffffff10 ST(4) 0.0
// R14 0000000000000003 R15 000000000049b700 VF PF ZF IF
//
// XMM0 00000000000000000000000000000000 XMM8 00000000000000000000000000000000
// XMM1 000000008000000400000000004160ea XMM9 00000000000000000000000000000000
// XMM2 00000000000000000000000000000000 XMM10 00000000000000000000000000000000
// XMM3 00000000000000000000000000000000 XMM11 00000000000000000000000000000000
// XMM4 00000000000000000000000000000000 XMM12 00000000000000000000000000000000
// XMM5 00000000000000000000000000000000 XMM13 00000000000000000000000000000000
// XMM6 00000000000000000000000000000000 XMM14 00000000000000000000000000000000
// XMM7 00000000000000000000000000000000 XMM15 00000000000000000000000000000000
//
// mm->i == 4;
// mm->p[ 0]=={0x00008007,0x00008008,-1,3,50}; /* 2 */
// /* 234,881,012 */
// mm->p[ 1]=={0x0e007ffd,0x0e007fff,-1,3,50}; /* 3 */
// /* 33,538,280 */
// mm->p[ 2]=={0x100040e8,0x100040e8,-1,3,50}; /* 1 */
// /* 1,610,596,103 */
// mm->p[ 3]=={0x6ffffff0,0x6fffffff,12884901888,306,0}; /* 16 */
// /* 22 frames mapped w/ 1,879,015,395 frames gapped */
//
// 00400000-0045b000 r-xp 00000000 08:03 4587526
// /home/jart/cosmo/o/dbg/test/libc/log/backtrace_test.com.tmp.11721
// 0045b000-00461000 rw-p 0005b000 08:03 4587526
// /home/jart/cosmo/o/dbg/test/libc/log/backtrace_test.com.tmp.11721
// 00461000-004a0000 rw-p 00000000 00:00 0
// 80070000-80090000 rw-p 00000000 00:00 0
// e007ffd0000-e0080000000 rw-p 00000000 00:00 0
// 100040e80000-100040e90000 rw-p 00000000 00:00 0
// 6ffffff00000-700000000000 rw-p 00000000 00:00 0
// 7ffe0743f000-7ffe07460000 rw-p 00000000 00:00 0 [stack]
// 7ffe075a8000-7ffe075ab000 r--p 00000000 00:00 0 [vvar]
// 7ffe075ab000-7ffe075ac000 r-xp 00000000 00:00 0 [vdso]
//
// /home/jart/cosmo/o/dbg/test/libc/log/backtrace_test.com.tmp.11721 1
TEST(ShowCrashReports, testDivideByZero) {
size_t got;
ssize_t rc;
int ws, pid, fds[2];
char *output, buf[512];
ASSERT_NE(-1, pipe2(fds, O_CLOEXEC));
ASSERT_NE(-1, (pid = fork()));
if (!pid) {
dup2(fds[1], 1);
dup2(fds[1], 2);
execv("bin/backtrace.com", (char *const[]){"bin/backtrace.com", "1", 0});
_Exit(127);
}
close(fds[1]);
output = 0;
appends(&output, "");
for (;;) {
rc = read(fds[0], buf, sizeof(buf));
if (rc == -1) {
ASSERT_EQ(EINTR, errno);
continue;
}
if ((got = rc)) {
appendd(&output, buf, got);
} else {
break;
}
}
close(fds[0]);
ASSERT_NE(-1, wait(&ws));
// tinyprint(2, _gc(IndentLines(output, -1, 0, 4)), "\n", NULL);
if (IsModeDbg()) {
EXPECT_EQ(77 << 8, ws);
} else {
EXPECT_TRUE(WIFSIGNALED(ws));
EXPECT_EQ(SIGFPE, WTERMSIG(ws));
}
/* NULL is stopgap until we can copy symbol tables into binary */
#ifdef __FNO_OMIT_FRAME_POINTER__
ASSERT_TRUE(OutputHasSymbol(output, "FpuCrash"));
#endif
if (strstr(output, "divrem overflow")) {
// UBSAN handled it
} else {
// ShowCrashReports() handled it
if (!strstr(output, _gc(xasprintf("%d", pid)))) {
fprintf(stderr, "ERROR: crash report didn't have pid\n%s\n",
_gc(IndentLines(output, -1, 0, 4)));
__die();
}
if (!strstr(output, "SIGFPE")) {
fprintf(stderr, "ERROR: crash report didn't have signal name\n%s\n",
_gc(IndentLines(output, -1, 0, 4)));
__die();
}
// XXX: WSL doesn't save and restore x87 registers to ucontext_t
if (!__iswsl1()) {
if (!strstr(output, "3.141")) {
fprintf(stderr, "ERROR: crash report didn't have fpu register\n%s\n",
_gc(IndentLines(output, -1, 0, 4)));
__die();
}
}
if (!strstr(output, "0f0e0d0c0b0a09080706050403020100")) {
fprintf(stderr, "ERROR: crash report didn't have sse register\n%s\n",
_gc(IndentLines(output, -1, 0, 4)));
__die();
}
if (!strstr(output, "3133731337")) {
fprintf(stderr, "ERROR: crash report didn't have general register\n%s\n",
_gc(IndentLines(output, -1, 0, 4)));
__die();
}
}
free(output);
}
// clang-format off
//
// test/libc/log/backtrace_test.c:59: ubsan error: 'int' index 10 into 'char [10]' out of bounds
// 0x000000000040a352: __die at libc/log/die.c:40
// 0x0000000000489bc8: __ubsan_abort at libc/intrin/ubsan.c:196
// 0x0000000000489e1c: __ubsan_handle_out_of_bounds at libc/intrin/ubsan.c:242
// 0x0000000000423666: BssOverrunCrash at test/libc/log/backtrace_test.c:59
// 0x0000000000423e0a: SetUp at test/libc/log/backtrace_test.c:115
// 0x000000000049350b: testlib_runtestcases at libc/testlib/testrunner.c:98
// 0x000000000048ab50: testlib_runalltests at libc/testlib/runner.c:37
// 0x00000000004028d0: main at libc/testlib/testmain.c:94
// 0x0000000000403977: cosmo at libc/runtime/cosmo.S:69
// 0x00000000004021ae: _start at libc/crt/crt.S:78
//
// asan error: global redzone 1-byte store at 0x00000048cf2a shadow 0x0000800899e5
// x
// ........................................OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
// |0 |0 |0 |0 |2 |-6 |-6 |-6 |-6
//                                ☺☻♥♦♣♠•◘○                                        
// 000000400000-000000460000 .text
// 000000460000-000000468000 .data
// 00007fff0000-00008000ffff
// 000080070000-00008009ffff ←shadow
// 02008fff0000-02009001ffff
// 020090060000-02009007ffff
// 0e007ffb0000-0e008000ffff
// 1000286b0000-1000286cffff
// 100080000000-10008009ffff
// 100080350000-10008036ffff
// 100080380000-10008038ffff
// 6fffffe00000-6fffffffffff
// 0x0000000000407af6: __die at libc/log/die.c:36
// 0x0000000000444f13: __asan_die at libc/intrin/asan.c:318
// 0x0000000000445bc8: __asan_report at libc/intrin/asan.c:667
// 0x0000000000445e41: __asan_report_memory_fault at libc/intrin/asan.c:672
// 0x0000000000446312: __asan_report_store at libc/intrin/asan.c:1008
// 0x0000000000444442: __asan_report_store1 at libc/intrin/somanyasan.S:118
// 0x0000000000416216: BssOverrunCrash at test/libc/log/backtrace_test.c:52
// 0x000000000041642a: SetUp at test/libc/log/backtrace_test.c:73
// 0x00000000004513eb: testlib_runtestcases at libc/testlib/testrunner.c:98
// 0x000000000044bbe0: testlib_runalltests at libc/testlib/runner.c:37
// 0x00000000004026db: main at libc/testlib/testmain.c:155
// 0x000000000040323f: cosmo at libc/runtime/cosmo.S:64
// 0x000000000040219b: _start at libc/crt/crt.S:67
//
// clang-format on
TEST(ShowCrashReports, testBssOverrunCrash) {
if (!IsAsan()) return;
size_t got;
ssize_t rc;
int ws, pid, fds[2];
char *output, buf[512];
ASSERT_NE(-1, pipe2(fds, O_CLOEXEC));
ASSERT_NE(-1, (pid = fork()));
if (!pid) {
dup2(fds[1], 1);
dup2(fds[1], 2);
execv("bin/backtrace.com", (char *const[]){"bin/backtrace.com", "2", 0});
_Exit(127);
}
close(fds[1]);
output = 0;
appends(&output, "");
for (;;) {
rc = read(fds[0], buf, sizeof(buf));
if (rc == -1) {
ASSERT_EQ(EINTR, errno);
continue;
}
if ((got = rc)) {
appendd(&output, buf, got);
} else {
break;
}
}
close(fds[0]);
ASSERT_NE(-1, wait(&ws));
// tinyprint(2, _gc(IndentLines(output, -1, 0, 4)), "\n", NULL);
EXPECT_EQ(77 << 8, ws);
/* NULL is stopgap until we can copy symbol tablces into binary */
#ifdef __FNO_OMIT_FRAME_POINTER__
ASSERT_TRUE(OutputHasSymbol(output, "BssOverrunCrash"));
#endif
if (IsAsan()) {
ASSERT_TRUE(
!!strstr(output, "'int' index 10 into 'char [10]' out of bounds"));
} else {
ASSERT_TRUE(!!strstr(output, "☺☻♥♦♣♠•◘○"));
ASSERT_TRUE(!!strstr(output, "global redzone"));
}
free(output);
}
// clang-format off
// asan error: null pointer dereference 1-byte load at 0x000000000000 shadow 0x00007fff8000
// x
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅
// |-17 |-17 |-17 |-17 |-17 |-1 |-1 |-1 |-1 |-1
// ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
// 000000400000-000000464000 .text
// 000000464000-00000046d000 .data
// 00007fff0000-00008000ffff ←shadow
// 000080070000-00008009ffff
// 02008fff0000-02009001ffff
// 020090060000-02009007ffff
// 0e007fff0000-0e008000ffff
// 10000d3e0000-10000d3fffff
// 100080000000-10008009ffff
// 100080370000-10008038ffff
// 1000803a0000-1000803affff
// 6ffffffe0000-6fffffffffff
// 0x0000000000407c84: __die at libc/log/die.c:37
// 0x000000000040b1ee: __asan_report_load at libc/intrin/asan.c:1083
// 0x000000000041639e: NpeCrash at test/libc/log/backtrace_test.c:87
// 0x0000000000416733: SetUp at test/libc/log/backtrace_test.c:120
// 0x00000000004541fb: testlib_runtestcases at libc/testlib/testrunner.c:98
// 0x000000000044d000: testlib_runalltests at libc/testlib/runner.c:37
// 0x00000000004026db: main at libc/testlib/testmain.c:94
// 0x000000000040327f: cosmo at libc/runtime/cosmo.S:64
// 0x000000000040219b: _start at libc/crt/crt.S:67
// clang-format on
TEST(ShowCrashReports, testNpeCrash) {
if (!IsAsan()) return;
size_t got;
ssize_t rc;
int ws, pid, fds[2];
char *output, buf[512];
ASSERT_NE(-1, pipe2(fds, O_CLOEXEC));
ASSERT_NE(-1, (pid = fork()));
if (!pid) {
dup2(fds[1], 1);
dup2(fds[1], 2);
execv("bin/backtrace.com", (char *const[]){"bin/backtrace.com", "7", 0});
_Exit(127);
}
close(fds[1]);
output = 0;
appends(&output, "");
for (;;) {
rc = read(fds[0], buf, sizeof(buf));
if (rc == -1) {
ASSERT_EQ(EINTR, errno);
continue;
}
if ((got = rc)) {
appendd(&output, buf, got);
} else {
break;
}
}
close(fds[0]);
ASSERT_NE(-1, wait(&ws));
// tinyprint(2, _gc(IndentLines(output, -1, 0, 4)), "\n", NULL);
EXPECT_EQ(77 << 8, ws);
/* NULL is stopgap until we can copy symbol tables into binary */
ASSERT_TRUE(!!strstr(output, "null pointer"));
#ifdef __FNO_OMIT_FRAME_POINTER__
ASSERT_TRUE(OutputHasSymbol(output, "NpeCrash"));
#endif
if (!strstr(output, "null pointer access")) { // ubsan
ASSERT_TRUE(!!strstr(output, "∅∅∅∅")); // asan
}
free(output);
}
TEST(ShowCrashReports, testDataOverrunCrash) {
if (!IsAsan()) return;
size_t got;
ssize_t rc;
int ws, pid, fds[2];
char *output, buf[512];
ASSERT_NE(-1, pipe2(fds, O_CLOEXEC));
ASSERT_NE(-1, (pid = fork()));
if (!pid) {
dup2(fds[1], 1);
dup2(fds[1], 2);
execv("bin/backtrace.com", (char *const[]){"bin/backtrace.com", "4", 0});
_Exit(127);
}
close(fds[1]);
output = 0;
appends(&output, "");
for (;;) {
rc = read(fds[0], buf, sizeof(buf));
if (rc == -1) {
ASSERT_EQ(EINTR, errno);
continue;
}
if ((got = rc)) {
appendd(&output, buf, got);
} else {
break;
}
}
close(fds[0]);
ASSERT_NE(-1, wait(&ws));
// tinyprint(2, _gc(IndentLines(output, -1, 0, 4)), "\n", NULL);
EXPECT_EQ(77 << 8, ws);
/* NULL is stopgap until we can copy symbol tablces into binary */
#ifdef __FNO_OMIT_FRAME_POINTER__
ASSERT_TRUE(OutputHasSymbol(output, "DataOverrunCrash"));
#endif
if (!strstr(output, "'int' index 10 into 'char [10]' out")) { // ubsan
ASSERT_TRUE(!!strstr(output, "☺☻♥♦♣♠•◘○")); // asan
ASSERT_TRUE(!!strstr(output, "global redzone")); // asan
}
free(output);
}
TEST(ShowCrashReports, testNpeCrashAfterFinalize) {
/*
* this test makes sure we're not doing things like depending on
* environment variables after __cxa_finalize is called in cases
* where putenv() is used
*/
size_t got;
ssize_t rc;
int ws, pid, fds[2];
char *output, buf[512];
ASSERT_NE(-1, pipe2(fds, O_CLOEXEC));
ASSERT_NE(-1, (pid = fork()));
if (!pid) {
dup2(fds[1], 1);
dup2(fds[1], 2);
execv("bin/backtrace.com", (char *const[]){"bin/backtrace.com", "8", 0});
_Exit(127);
}
close(fds[1]);
output = 0;
appends(&output, "");
for (;;) {
rc = read(fds[0], buf, sizeof(buf));
if (rc == -1) {
ASSERT_EQ(EINTR, errno);
continue;
}
if ((got = rc)) {
appendd(&output, buf, got);
} else {
break;
}
}
close(fds[0]);
ASSERT_NE(-1, wait(&ws));
// tinyprint(2, _gc(IndentLines(output, -1, 0, 4)), "\n", NULL);
if (IsModeDbg()) {
EXPECT_EQ(77 << 8, ws);
} else {
EXPECT_TRUE(WIFSIGNALED(ws));
EXPECT_EQ(SIGSEGV, WTERMSIG(ws));
}
/* NULL is stopgap until we can copy symbol tables into binary */
if (!strstr(output, IsAsan() ? "null pointer" : "Uncaught SIGSEGV (SEGV_")) {
fprintf(stderr, "ERROR: crash report didn't diagnose the problem\n%s\n",
_gc(IndentLines(output, -1, 0, 4)));
__die();
}
#ifdef __FNO_OMIT_FRAME_POINTER__
if (!OutputHasSymbol(output, "NpeCrash")) {
fprintf(stderr, "ERROR: crash report didn't have backtrace\n%s\n",
_gc(IndentLines(output, -1, 0, 4)));
__die();
}
#endif
free(output);
}
#endif
#endif /* __x86_64__ */
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