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cosmopolitan/test/libc/runtime/mmap_test.c
Jōshin 6e6fc38935
Apply clang-format update to repo (#1154) 
Commit bc6c183 introduced a bunch of discrepancies between what files
look like in the repo and what clang-format says they should look like.
However, there were already a few discrepancies prior to that. Most of
these discrepancies seemed to be unintentional, but a few of them were
load-bearing (e.g., a #include that violated header ordering needing
something to have been #defined by a 'later' #include.)

I opted to take what I hope is a relatively smooth-brained approach: I
reverted the .clang-format change, ran clang-format on the whole repo,
reapplied the .clang-format change, reran clang-format again, and then
reverted the commit that contained the first run. Thus the full effect
of this PR should only be to apply the changed formatting rules to the
repo, and from skimming the results, this seems to be the case.

My work can be checked by applying the short, manual commits, and then
rerunning the command listed in the autogenerated commits (those whose
messages I have prefixed auto:) and seeing if your results agree.

It might be that the other diffs should be fixed at some point but I'm
leaving that aside for now.

fd '\.c(c|pp)?$' --print0| xargs -0 clang-format -i
2024-04-25 10:38:00 -07:00

486 lines
17 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 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 "ape/sections.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/ucontext.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/safemacros.internal.h"
#include "libc/intrin/xchg.internal.h"
#include "libc/limits.h"
#include "libc/log/log.h"
#include "libc/mem/gc.h"
#include "libc/mem/mem.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/stack.h"
#include "libc/runtime/sysconf.h"
#include "libc/stdio/rand.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/auxv.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/msync.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
#include "libc/x/xspawn.h"
#include "third_party/xed/x86.h"
__static_yoink("zipos");
void SetUpOnce(void) {
testlib_enable_tmp_setup_teardown();
// ASSERT_SYS(0, 0, pledge("stdio rpath wpath cpath proc", 0));
}
TEST(mmap, zeroSize) {
ASSERT_SYS(EINVAL, MAP_FAILED,
mmap(NULL, 0, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0));
}
TEST(mmap, overflow) {
ASSERT_SYS(EINVAL, MAP_FAILED,
mmap(NULL, 0x800000000000, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE,
-1, 0));
ASSERT_SYS(EINVAL, MAP_FAILED,
mmap(NULL, 0x7fffffffffff, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE,
-1, 0));
}
TEST(mmap, outOfAutomapRange) {
ASSERT_SYS(
ENOMEM, MAP_FAILED,
mmap(NULL, kAutomapSize, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0));
}
TEST(mmap, noreplaceImage) {
ASSERT_SYS(EEXIST, MAP_FAILED,
mmap(__executable_start, FRAMESIZE, PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0));
}
TEST(mmap, noreplaceExistingMap) {
char *p;
ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE, PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
ASSERT_SYS(EEXIST, MAP_FAILED,
mmap(p, FRAMESIZE, PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0));
EXPECT_SYS(0, 0, munmap(p, FRAMESIZE));
}
TEST(mmap, smallerThanPage_mapsRemainder) {
long pagesz = sysconf(_SC_PAGESIZE);
char *map =
mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_NE(MAP_FAILED, map);
EXPECT_TRUE(testlib_memoryexists(map));
EXPECT_TRUE(testlib_memoryexists(map + (pagesz - 1)));
EXPECT_SYS(0, 0, munmap(map, 1));
EXPECT_FALSE(testlib_memoryexists(map));
EXPECT_FALSE(testlib_memoryexists(map + (pagesz - 1)));
}
TEST(mmap, smallerThanPage_remainderIsPoisoned) {
if (!IsAsan())
return;
char *map;
ASSERT_NE(MAP_FAILED, (map = mmap(0, 1, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)));
EXPECT_TRUE(__asan_is_valid(map, 1));
EXPECT_FALSE(__asan_is_valid(map + 1, 1));
EXPECT_SYS(0, 0, munmap(map, 1));
}
TEST(mmap, testMapFile) {
int fd;
char *p;
char path[PATH_MAX];
sprintf(path, "%s.%ld", program_invocation_short_name, lemur64());
ASSERT_NE(-1, (fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0644)));
EXPECT_EQ(5, write(fd, "hello", 5));
EXPECT_NE(-1, fdatasync(fd));
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 5, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("hello", p, 5);
EXPECT_NE(-1, munmap(p, 5));
EXPECT_NE(-1, close(fd));
EXPECT_NE(-1, unlink(path));
}
TEST(mmap, testMapFile_fdGetsClosed_makesNoDifference) {
int fd;
char *p, buf[16], path[PATH_MAX];
sprintf(path, "%s.%ld", program_invocation_short_name, lemur64());
ASSERT_NE(-1, (fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0644)));
EXPECT_EQ(5, write(fd, "hello", 5));
EXPECT_NE(-1, fdatasync(fd));
EXPECT_NE(MAP_FAILED,
(p = mmap(NULL, 5, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)));
EXPECT_NE(-1, close(fd));
EXPECT_STREQN("hello", p, 5);
p[1] = 'a';
EXPECT_NE(-1, msync(p, getauxval(AT_PAGESZ), MS_SYNC));
ASSERT_NE(-1, (fd = open(path, O_RDONLY)));
EXPECT_EQ(5, read(fd, buf, 5));
EXPECT_STREQN("hallo", buf, 5);
EXPECT_NE(-1, close(fd));
EXPECT_NE(-1, munmap(p, 5));
EXPECT_NE(-1, unlink(path));
}
TEST(mmap, testMapFixed_destroysEverythingInItsPath) {
unsigned m1 = _mmi.i;
EXPECT_NE(MAP_FAILED, mmap((void *)(kFixedmapStart + FRAMESIZE * 0),
FRAMESIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
EXPECT_NE(MAP_FAILED, mmap((void *)(kFixedmapStart + FRAMESIZE * 1),
FRAMESIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
EXPECT_NE(MAP_FAILED, mmap((void *)(kFixedmapStart + FRAMESIZE * 2),
FRAMESIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
EXPECT_NE(MAP_FAILED, mmap((void *)(kFixedmapStart + FRAMESIZE * 0),
FRAMESIZE * 3, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
ASSERT_GT(_mmi.i, m1);
EXPECT_NE(-1, munmap((void *)kFixedmapStart, FRAMESIZE * 3));
}
#ifdef __x86_64__
TEST(mmap, customStackMemory_isAuthorized) {
char *stack;
uintptr_t w, r;
ASSERT_NE(MAP_FAILED,
(stack = mmap(NULL, GetStackSize(), PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_STACK, -1, 0)));
asm("mov\t%%rsp,%0\n\t"
"mov\t%2,%%rsp\n\t"
"push\t%3\n\t"
"pop\t%1\n\t"
"mov\t%0,%%rsp"
: "=&r"(w), "=&r"(r)
: "rm"(stack + GetStackSize() - 8), "i"(123));
ASSERT_EQ(123, r);
EXPECT_SYS(0, 0, munmap(stack, GetStackSize()));
}
#endif /* __x86_64__ */
TEST(mmap, fileOffset) {
int fd;
char *map;
int offset_align = IsWindows() ? FRAMESIZE : getauxval(AT_PAGESZ);
ASSERT_NE(-1, (fd = open("foo", O_CREAT | O_RDWR, 0644)));
EXPECT_NE(-1, ftruncate(fd, offset_align * 2));
EXPECT_NE(-1, pwrite(fd, "hello", 5, offset_align * 0));
EXPECT_NE(-1, pwrite(fd, "there", 5, offset_align * 1));
EXPECT_NE(-1, fdatasync(fd));
ASSERT_NE(MAP_FAILED, (map = mmap(NULL, offset_align, PROT_READ, MAP_PRIVATE,
fd, offset_align)));
EXPECT_EQ(0, memcmp(map, "there", 5), "%#.*s", 5, map);
EXPECT_NE(-1, munmap(map, offset_align));
EXPECT_NE(-1, close(fd));
}
TEST(mmap, mapPrivate_writesDontChangeFile) {
int fd;
char *map, buf[6];
ASSERT_NE(-1, (fd = open("bar", O_CREAT | O_RDWR, 0644)));
EXPECT_NE(-1, ftruncate(fd, FRAMESIZE));
EXPECT_NE(-1, pwrite(fd, "hello", 5, 0));
ASSERT_NE(MAP_FAILED, (map = mmap(NULL, FRAMESIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE, fd, 0)));
memcpy(map, "there", 5);
EXPECT_NE(-1, msync(map, FRAMESIZE, MS_SYNC));
EXPECT_NE(-1, munmap(map, FRAMESIZE));
EXPECT_NE(-1, pread(fd, buf, 6, 0));
EXPECT_EQ(0, memcmp(buf, "hello", 5), "%#.*s", 5, buf);
EXPECT_NE(-1, close(fd));
}
TEST(mmap, twoPowerSize_automapsAddressWithThatAlignment) {
char *q, *p;
// increase the likelihood automap is unaligned w.r.t. following call
ASSERT_NE(MAP_FAILED, (q = mmap(NULL, 0x00010000, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0)));
// ask for a nice big round size
ASSERT_NE(MAP_FAILED, (p = mmap(NULL, 0x00080000, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0)));
// verify it's aligned
ASSERT_EQ(0, (intptr_t)p & 0x0007ffff);
EXPECT_SYS(0, 0, munmap(p, 0x00080000));
}
TEST(isheap, nullPtr) {
ASSERT_FALSE(_isheap(NULL));
}
TEST(isheap, malloc) {
ASSERT_TRUE(_isheap(gc(malloc(1))));
}
/* TEST(isheap, emptyMalloc) { */
/* ASSERT_TRUE(_isheap(gc(malloc(0)))); */
/* } */
/* TEST(isheap, mallocOffset) { */
/* char *p = gc(malloc(131072)); */
/* ASSERT_TRUE(_isheap(p + 100000)); */
/* } */
static const char *ziposLifePath = "/zip/life.elf";
TEST(mmap, ziposCannotBeAnonymous) {
int fd;
void *p;
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_SYS(EINVAL, MAP_FAILED,
(p = mmap(NULL, 0x00010000, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS,
fd, 0)));
close(fd);
}
TEST(mmap, ziposCannotBeShared) {
int fd;
void *p;
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_SYS(EINVAL, MAP_FAILED,
(p = mmap(NULL, 0x00010000, PROT_READ, MAP_SHARED, fd, 0)));
close(fd);
}
////////////////////////////////////////////////////////////////////////////////
// zipos NON-SHARED READ-ONLY FILE MEMORY
TEST(mmap, ziposCow) {
int fd;
void *p;
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_NE(MAP_FAILED,
(p = mmap(NULL, 0x00010000, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("\177ELF", ((const char *)p), 4);
EXPECT_NE(-1, munmap(p, 0x00010000));
EXPECT_NE(-1, close(fd));
}
////////////////////////////////////////////////////////////////////////////////
// zipos NON-SHARED READ-ONLY FILE MEMORY BETWEEN PROCESSES
TEST(mmap, ziposCowFileMapReadonlyFork) {
int fd, ws;
void *p;
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 4, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("ELF", ((const char *)p) + 1, 3);
ASSERT_NE(-1, (ws = xspawn(0)));
if (ws == -2) {
ASSERT_STREQN("ELF", ((const char *)p) + 1, 3);
_exit(0);
}
EXPECT_EQ(0, ws);
EXPECT_STREQN("ELF", ((const char *)p) + 1, 3);
EXPECT_NE(-1, munmap(p, 6));
EXPECT_NE(-1, close(fd));
}
////////////////////////////////////////////////////////////////////////////////
// zipos NON-SHARED READ/WRITE FILE MEMORY BETWEEN PROCESSES
TEST(mmap, ziposCowFileMapFork) {
int fd, ws;
void *p;
char lol[4];
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_NE(MAP_FAILED,
(p = mmap(NULL, 6, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0)));
memcpy(p, "parnt", 6);
ASSERT_NE(-1, (ws = xspawn(0)));
if (ws == -2) {
ASSERT_STREQN("parnt", p, 5);
strcpy(p, "child");
ASSERT_STREQN("child", p, 5);
_exit(0);
}
EXPECT_EQ(0, ws);
EXPECT_STREQN("parnt", p, 5); // child changing memory did not change parent
EXPECT_EQ(4, pread(fd, lol, 4, 0));
EXPECT_STREQN("ELF", &lol[1], 3); // changing memory did not change file
EXPECT_NE(-1, munmap(p, 6));
EXPECT_NE(-1, close(fd));
}
////////////////////////////////////////////////////////////////////////////////
// NON-SHARED READ-ONLY FILE MEMORY
TEST(mmap, cow) {
int fd;
char *p;
char path[PATH_MAX];
sprintf(path, "%s.%ld", program_invocation_short_name, lemur64());
ASSERT_NE(-1, (fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0644)), "%s",
path);
EXPECT_EQ(5, write(fd, "hello", 5));
EXPECT_NE(-1, fdatasync(fd));
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 5, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("hello", p, 5);
EXPECT_NE(-1, munmap(p, 5));
EXPECT_NE(-1, close(fd));
EXPECT_NE(-1, unlink(path));
}
////////////////////////////////////////////////////////////////////////////////
// NON-SHARED READ-ONLY FILE MEMORY BETWEEN PROCESSES
TEST(mmap, cowFileMapReadonlyFork) {
char *p;
int fd, ws;
char path[PATH_MAX];
sprintf(path, "%s.%ld", program_invocation_short_name, lemur64());
ASSERT_NE(-1, (fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0644)));
EXPECT_EQ(6, write(fd, "hello", 6));
EXPECT_NE(-1, close(fd));
ASSERT_NE(-1, (fd = open(path, O_RDONLY)));
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 6, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("hello", p, 5);
ASSERT_NE(-1, (ws = xspawn(0)));
if (ws == -2) {
ASSERT_STREQN("hello", p, 5);
_exit(0);
}
EXPECT_EQ(0, ws);
EXPECT_STREQN("hello", p, 5);
EXPECT_NE(-1, munmap(p, 6));
EXPECT_NE(-1, close(fd));
EXPECT_NE(-1, unlink(path));
}
////////////////////////////////////////////////////////////////////////////////
// NON-SHARED READ/WRITE FILE MEMORY BETWEEN PROCESSES
TEST(mmap, cowFileMapFork) {
char *p;
int fd, ws;
char path[PATH_MAX], lol[6];
sprintf(path, "%s.%ld", program_invocation_short_name, lemur64());
ASSERT_NE(-1, (fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0644)));
EXPECT_EQ(6, write(fd, "parnt", 6));
EXPECT_NE(-1, fdatasync(fd));
EXPECT_NE(MAP_FAILED,
(p = mmap(NULL, 6, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("parnt", p, 5);
ASSERT_NE(-1, (ws = xspawn(0)));
if (ws == -2) {
ASSERT_STREQN("parnt", p, 5);
strcpy(p, "child");
ASSERT_STREQN("child", p, 5);
_exit(0);
}
EXPECT_EQ(0, ws);
EXPECT_STREQN("parnt", p, 5); // child changing memory did not change parent
EXPECT_EQ(6, pread(fd, lol, 6, 0));
EXPECT_STREQN("parnt", lol, 5); // changing memory did not change file
EXPECT_NE(-1, munmap(p, 6));
EXPECT_NE(-1, close(fd));
EXPECT_NE(-1, unlink(path));
}
////////////////////////////////////////////////////////////////////////////////
// SHARED ANONYMOUS MEMORY BETWEEN PROCESSES
TEST(mmap, sharedAnonMapFork) {
int ws;
char *p;
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 6, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0)));
strcpy(p, "parnt");
EXPECT_STREQN("parnt", p, 5);
ASSERT_NE(-1, (ws = xspawn(0)));
if (ws == -2) {
ASSERT_STREQN("parnt", p, 5);
strcpy(p, "child");
ASSERT_STREQN("child", p, 5);
_exit(0);
}
EXPECT_EQ(0, ws);
EXPECT_STREQN("child", p, 5); // boom
EXPECT_NE(-1, munmap(p, 5));
}
////////////////////////////////////////////////////////////////////////////////
// SHARED FILE MEMORY BETWEEN PROCESSES
TEST(mmap, sharedFileMapFork) {
char *p;
int fd, ws;
char path[PATH_MAX], lol[6];
sprintf(path, "%s.%ld", program_invocation_short_name, lemur64());
ASSERT_NE(-1, (fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0644)));
EXPECT_EQ(6, write(fd, "parnt", 6));
EXPECT_NE(-1, fdatasync(fd));
EXPECT_NE(MAP_FAILED,
(p = mmap(NULL, 6, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)));
EXPECT_STREQN("parnt", p, 5);
ASSERT_NE(-1, (ws = xspawn(0)));
if (ws == -2) {
ASSERT_STREQN("parnt", p, 5);
strcpy(p, "child");
ASSERT_STREQN("child", p, 5);
ASSERT_NE(-1, msync(p, 6, MS_SYNC | MS_INVALIDATE));
_exit(0);
}
EXPECT_EQ(0, ws);
EXPECT_STREQN("child", p, 5); // child changing memory changed parent memory
// XXX: RHEL5 has a weird issue where if we read the file into its own
// shared memory then corruption occurs!
EXPECT_EQ(6, pread(fd, lol, 6, 0));
EXPECT_STREQN("child", lol, 5); // changing memory changed file
EXPECT_NE(-1, munmap(p, 6));
EXPECT_NE(-1, close(fd));
EXPECT_NE(-1, unlink(path));
}
////////////////////////////////////////////////////////////////////////////////
// BENCHMARKS
#define N (EZBENCH_COUNT * EZBENCH_TRIES)
int count;
void *ptrs[N];
void BenchUnmap(void) {
ASSERT_EQ(0, munmap(ptrs[count++], FRAMESIZE));
}
void BenchMmapPrivate(void) {
void *p;
p = mmap(0, FRAMESIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE,
-1, 0);
if (p == MAP_FAILED)
abort();
ptrs[count++] = p;
}
BENCH(mmap, bench) {
EZBENCH2("mmap", donothing, BenchMmapPrivate());
EZBENCH2("munmap", donothing, BenchUnmap());
}
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