mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-13 00:52:39 +00:00
a4b455185b
Renaming gc() to _gc() was a mistake since the better thing to do is put it behind the _COSMO_SOURCE macro. We need this change because I haven't wanted to use my amazing garbage collector ever since we renamed it. You now need to define _COSMO_SOURCE yourself when using amalgamation header and cosmocc users need to pass the -mcosmo flag to get the gc() function Some other issues relating to cancelation have been fixed along the way. We're also now putting cosmocc in a folder named `.cosmocc` so it can be more safely excluded by grep --exclude-dir=.cosmocc --exclude-dir=o etc.
261 lines
8.5 KiB
C
261 lines
8.5 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 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/assert.h"
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#include "libc/calls/blockcancel.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/calls/struct/stat.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/limits.h"
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#include "libc/proc/execve.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/fd.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/mfd.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/shm.h"
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#include "libc/sysv/errfuns.h"
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static bool IsAPEFd(const int fd) {
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char buf[8];
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return (sys_pread(fd, buf, 8, 0, 0) == 8) && IsApeLoadable(buf);
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}
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static int fexecve_impl(const int fd, char *const argv[], char *const envp[]) {
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int rc;
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if (IsLinux()) {
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char path[14 + 12];
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FormatInt32(stpcpy(path, "/proc/self/fd/"), fd);
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rc = __sys_execve(path, argv, envp);
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} else if (IsFreebsd()) {
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rc = sys_fexecve(fd, argv, envp);
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} else {
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rc = enosys();
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}
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return rc;
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}
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typedef enum {
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PTF_NUM = 1 << 0,
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PTF_NUM2 = 1 << 1,
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PTF_NUM3 = 1 << 2,
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PTF_ANY = 1 << 3
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} PTF_PARSE;
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static bool ape_to_elf(void *ape, const size_t apesize) {
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static const char printftok[] = "printf '";
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static const size_t printftoklen = sizeof(printftok) - 1;
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const char *tok = memmem(ape, apesize, printftok, printftoklen);
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if (tok) {
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tok += printftoklen;
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uint8_t *dest = ape;
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PTF_PARSE state = PTF_ANY;
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uint8_t value = 0;
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for (; tok < (const char *)(dest + apesize); tok++) {
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if ((state & (PTF_NUM | PTF_NUM2 | PTF_NUM3)) &&
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(*tok >= '0' && *tok <= '7')) {
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value = (value << 3) | (*tok - '0');
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state <<= 1;
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if (state & PTF_ANY) {
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*dest++ = value;
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}
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} else if (state & PTF_NUM) {
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break;
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} else {
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if (state & (PTF_NUM2 | PTF_NUM3)) {
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*dest++ = value;
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}
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if (*tok == '\\') {
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state = PTF_NUM;
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value = 0;
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} else if (*tok == '\'') {
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return true;
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} else {
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*dest++ = *tok;
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state = PTF_ANY;
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}
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}
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}
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}
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errno = ENOEXEC;
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return false;
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}
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/**
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* Creates a memfd and copies fd to it.
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*
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* This does an inplace conversion of APE to ELF when detected!!!!
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*/
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static int fd_to_mem_fd(const int infd, char *path) {
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if ((!IsLinux() && !IsFreebsd()) || !_weaken(mmap) || !_weaken(munmap)) {
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return enosys();
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}
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struct stat st;
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if (fstat(infd, &st) == -1) {
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return -1;
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}
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int fd;
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if (IsLinux()) {
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fd = sys_memfd_create(__func__, MFD_CLOEXEC);
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} else if (IsFreebsd()) {
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fd = sys_shm_open(SHM_ANON, O_CREAT | O_RDWR, 0);
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} else {
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return enosys();
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}
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if (fd == -1) {
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return -1;
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}
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void *space;
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if ((sys_ftruncate(fd, st.st_size, st.st_size) != -1) &&
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((space = _weaken(mmap)(0, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED,
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fd, 0)) != MAP_FAILED)) {
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ssize_t readRc;
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readRc = pread(infd, space, st.st_size, 0);
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bool success = readRc != -1;
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if (success && (st.st_size > 8) && IsApeLoadable(space)) {
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int flags = fcntl(fd, F_GETFD);
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if ((success = (flags != -1) &&
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(fcntl(fd, F_SETFD, flags & (~FD_CLOEXEC)) != -1) &&
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ape_to_elf(space, st.st_size))) {
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const int newfd = fcntl(fd, F_DUPFD, 9001);
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if (newfd != -1) {
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close(fd);
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fd = newfd;
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}
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}
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}
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const int e = errno;
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if ((_weaken(munmap)(space, st.st_size) != -1) && success) {
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if (path) {
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FormatInt32(stpcpy(path, "COSMOPOLITAN_INIT_ZIPOS="), fd);
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}
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unassert(readRc == st.st_size);
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return fd;
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} else if (!success) {
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errno = e;
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}
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}
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const int e = errno;
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close(fd);
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errno = e;
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return -1;
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}
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/**
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* Executes binary executable at file descriptor.
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*
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* This is only supported on Linux and FreeBSD. APE binaries are
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* supported. Zipos is supported. Zipos fds or FD_CLOEXEC APE fds or
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* fds that fail fexecve with ENOEXEC are copied to a new memfd (with
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* in-memory APE to ELF conversion) and fexecve is (re)attempted.
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*
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* @param fd is opened executable and current file position is ignored
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* @return doesn't return on success, otherwise -1 w/ errno
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* @raise ENOEXEC if file at `fd` isn't an assimilated ELF executable
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* @raise ENOSYS on Windows, XNU, OpenBSD, NetBSD, and Metal
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*/
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int fexecve(int fd, char *const argv[], char *const envp[]) {
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int rc = 0;
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if (!argv || !envp ||
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(IsAsan() &&
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(!__asan_is_valid_strlist(argv) || !__asan_is_valid_strlist(envp)))) {
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rc = efault();
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} else {
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STRACE("fexecve(%d, %s, %s) → ...", fd, DescribeStringList(argv),
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DescribeStringList(envp));
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int savedErr = 0;
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do {
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if (!IsLinux() && !IsFreebsd()) {
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rc = enosys();
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break;
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}
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if (!__isfdkind(fd, kFdZip)) {
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bool memfdReq;
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BLOCK_SIGNALS;
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BLOCK_CANCELATION;
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strace_enabled(-1);
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memfdReq = ((rc = fcntl(fd, F_GETFD)) != -1) && (rc & FD_CLOEXEC) &&
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IsAPEFd(fd);
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strace_enabled(+1);
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ALLOW_CANCELATION;
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ALLOW_SIGNALS;
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if (rc == -1) {
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break;
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} else if (!memfdReq) {
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fexecve_impl(fd, argv, envp);
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if (errno != ENOEXEC) {
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break;
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}
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savedErr = ENOEXEC;
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}
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}
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int newfd;
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char *path = alloca(PATH_MAX);
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BLOCK_SIGNALS;
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BLOCK_CANCELATION;
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strace_enabled(-1);
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newfd = fd_to_mem_fd(fd, path);
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strace_enabled(+1);
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ALLOW_CANCELATION;
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ALLOW_SIGNALS;
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if (newfd == -1) {
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break;
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}
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size_t numenvs;
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for (numenvs = 0; envp[numenvs];) ++numenvs;
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// const size_t desenvs = min(500, max(numenvs + 1, 2));
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static _Thread_local char *envs[500];
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memcpy(envs, envp, numenvs * sizeof(char *));
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envs[numenvs] = path;
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envs[numenvs + 1] = NULL;
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fexecve_impl(newfd, argv, envs);
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if (!savedErr) {
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savedErr = errno;
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}
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BLOCK_SIGNALS;
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BLOCK_CANCELATION;
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strace_enabled(-1);
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close(newfd);
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strace_enabled(+1);
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ALLOW_CANCELATION;
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ALLOW_SIGNALS;
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} while (0);
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if (savedErr) {
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errno = savedErr;
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}
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rc = -1;
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}
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STRACE("fexecve(%d) failed %d% m", fd, rc);
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return rc;
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}
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