mirror of
https://github.com/jart/cosmopolitan.git
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69f4152f38
We had previously not enabled TLS in MODE=tiny in order to keep the smallest example programs (e.g. life.com) just 16kb in size. But it was error prone doing that, so now we just always enable it because this change uses hacks to ensure it won't increase life.com's size. This change also fixes a bug on NetBSD, where signal handlers would break thread local storage if SA_SIGINFO was being used. This looks like it might be a bug in NetBSD, but it's got a simple workaround.
255 lines
10 KiB
C
255 lines
10 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/bits/atomic.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/siginfo.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/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/testlib/testlib.h"
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#include "third_party/xed/x86.h"
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volatile int gotsignal;
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char testlib_enable_tmp_setup_teardown;
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void ContinueOnError(int sig, siginfo_t *si, ucontext_t *ctx) {
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struct XedDecodedInst xedd;
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xed_decoded_inst_zero_set_mode(&xedd, XED_MACHINE_MODE_LONG_64);
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xed_instruction_length_decode(&xedd, (void *)ctx->uc_mcontext.rip, 15);
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ctx->uc_mcontext.rip += xedd.length;
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gotsignal = sig;
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}
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noasan bool MemoryExists(char *p) {
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volatile char c;
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struct sigaction old[2];
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struct sigaction sa = {
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.sa_sigaction = ContinueOnError,
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.sa_flags = SA_SIGINFO,
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};
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gotsignal = 0;
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sigaction(SIGSEGV, &sa, old + 0);
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sigaction(SIGBUS, &sa, old + 1);
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c = atomic_load(p);
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sigaction(SIGBUS, old + 1, 0);
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sigaction(SIGSEGV, old + 0, 0);
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return !gotsignal;
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}
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TEST(munmap, doesntExist_doesntCare) {
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EXPECT_SYS(0, 0, munmap(0, FRAMESIZE * 8));
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if (IsAsan()) {
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// make sure it didn't unmap the null pointer shadow memory
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EXPECT_TRUE(MemoryExists((char *)0x7fff8000));
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}
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}
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TEST(munmap, invalidParams) {
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EXPECT_SYS(EINVAL, -1, munmap(0, 0));
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EXPECT_SYS(EINVAL, -1, munmap((void *)0x100080000000, 0));
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EXPECT_SYS(EINVAL, -1, munmap((void *)0x100080000001, FRAMESIZE));
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}
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TEST(munmap, test) {
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char *p;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_TRUE(MemoryExists(p));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE));
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EXPECT_FALSE(MemoryExists(p));
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}
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TEST(munmap, punchHoleInMemory) {
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char *p;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE * 3, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 2));
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EXPECT_SYS(0, 0, munmap(p + FRAMESIZE, FRAMESIZE));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 2));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE));
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EXPECT_SYS(0, 0, munmap(p + FRAMESIZE * 2, FRAMESIZE));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 2));
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}
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TEST(munmap, memoryHasHole) {
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char *p;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE * 3, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_SYS(0, 0, munmap(p + FRAMESIZE, FRAMESIZE));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 2));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE * 3));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 2));
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}
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TEST(munmap, blanketFree) {
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char *p;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE * 3, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 2));
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EXPECT_SYS(0, 0, munmap(p + FRAMESIZE * 0, FRAMESIZE));
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EXPECT_SYS(0, 0, munmap(p + FRAMESIZE * 2, FRAMESIZE));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 2));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE * 3));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 2));
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}
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TEST(munmap, trimLeft) {
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char *p;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE * 2, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE * 2));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 1));
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}
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TEST(munmap, trimRight) {
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char *p;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE * 2, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_SYS(0, 0, munmap(p + FRAMESIZE, FRAMESIZE));
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EXPECT_TRUE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 1));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE * 2));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 0));
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EXPECT_FALSE(MemoryExists(p + FRAMESIZE * 1));
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}
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TEST(munmap, memoryGone) {
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char *p;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE));
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}
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TEST(munmap, testTooSmallToUnmapAsan) {
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if (!IsAsan()) return;
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char *p;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_TRUE(MemoryExists((char *)(((intptr_t)p >> 3) + 0x7fff8000)));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE));
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EXPECT_TRUE(MemoryExists((char *)(((intptr_t)p >> 3) + 0x7fff8000)));
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}
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TEST(munmap, testLargeEnoughToUnmapAsan) {
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if (!IsAsan()) return;
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if (IsWindows()) {
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// we're unfortunately never able to unmap asan pages on windows
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// because the memtrack array items always have to be 64kb so we
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// we're able to store a handle for each
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return;
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}
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char *p;
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size_t n;
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n = FRAMESIZE * 8 * 2;
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ASSERT_NE(MAP_FAILED, (p = mmap(0, n, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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EXPECT_SYS(0, 0, munmap(p, n));
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#if 0
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EXPECT_FALSE(
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MemoryExists((char *)(((intptr_t)(p + n / 2) >> 3) + 0x7fff8000)));
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#endif
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}
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TEST(munmap, tinyFile_roundupUnmapSize) {
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char *p;
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ASSERT_SYS(0, 3, open("doge", O_WRONLY | O_CREAT | O_TRUNC, 0644));
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ASSERT_SYS(0, 5, write(3, "hello", 5));
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ASSERT_SYS(0, 0, close(3));
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ASSERT_SYS(0, 3, open("doge", O_RDONLY));
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ASSERT_NE(MAP_FAILED, (p = mmap(0, 5, PROT_READ, MAP_PRIVATE, 3, 0)));
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ASSERT_SYS(0, 0, close(3));
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EXPECT_TRUE(MemoryExists(p));
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// some kernels/versions support this, some don't
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EXPECT_FALSE(MemoryExists(p + PAGESIZE));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE));
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EXPECT_FALSE(MemoryExists(p));
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EXPECT_FALSE(MemoryExists(p + 5));
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}
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TEST(munmap, tinyFile_preciseUnmapSize) {
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char *p, *q;
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ASSERT_SYS(0, 3, open("doge", O_WRONLY | O_CREAT | O_TRUNC, 0644));
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ASSERT_SYS(0, 5, write(3, "hello", 5));
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ASSERT_SYS(0, 0, close(3));
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ASSERT_SYS(0, 3, open("doge", O_RDONLY));
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ASSERT_NE(MAP_FAILED, (p = mmap(0, 5, PROT_READ, MAP_PRIVATE, 3, 0)));
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ASSERT_NE(MAP_FAILED, (q = mmap(0, 5, PROT_READ, MAP_PRIVATE, 3, 0)));
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ASSERT_SYS(0, 0, close(3));
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EXPECT_TRUE(MemoryExists(p));
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EXPECT_TRUE(MemoryExists(q));
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EXPECT_SYS(0, 0, munmap(p, 5));
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EXPECT_FALSE(MemoryExists(p));
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EXPECT_TRUE(MemoryExists(q));
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EXPECT_SYS(0, 0, munmap(q, 5));
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EXPECT_FALSE(MemoryExists(q));
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}
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// clang-format off
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TEST(munmap, tinyFile_mapThriceUnmapOnce) {
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char *p = (char *)0x02000000;
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ASSERT_SYS(0, 3, open("doge", O_RDWR | O_CREAT | O_TRUNC, 0644));
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ASSERT_SYS (0, 5, write(3, "hello", 5));
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ASSERT_NE(MAP_FAILED, mmap(p+FRAMESIZE*0, FRAMESIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, -1, 0));
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ASSERT_NE(MAP_FAILED, mmap(p+FRAMESIZE*1, 5, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0));
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ASSERT_NE(MAP_FAILED, mmap(p+FRAMESIZE*3, 5, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0));
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ASSERT_SYS(0, 0, close(3));
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EXPECT_TRUE(MemoryExists(p+FRAMESIZE*0));
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EXPECT_TRUE(MemoryExists(p+FRAMESIZE*1));
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EXPECT_FALSE(MemoryExists(p+FRAMESIZE*2));
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EXPECT_TRUE(MemoryExists(p+FRAMESIZE*3));
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EXPECT_SYS(0, 0, munmap(p, FRAMESIZE*5));
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EXPECT_FALSE(MemoryExists(p+FRAMESIZE*0));
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EXPECT_FALSE(MemoryExists(p+FRAMESIZE*1));
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EXPECT_FALSE(MemoryExists(p+FRAMESIZE*2));
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EXPECT_FALSE(MemoryExists(p+FRAMESIZE*3));
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}
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// clang-format on
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