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https://github.com/jart/cosmopolitan.git
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ccbae7799e
This change also found a few POSIX compliance bugs with errnos. Another bug was discovered where, on Windows, pread() and pwrite() could modify the file position in cases where ReadFile() returned an error e.g. when seeking past the end of file. We also have more tests!
59 lines
3.4 KiB
C
59 lines
3.4 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/calls/calls.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/intrin/asan.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Changes root directory.
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*
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* Please consider using unveil() instead of chroot(). If you use this
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* system call then consider using both chdir() and closefrom() before
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* calling this function. Otherwise there's a small risk that fchdir()
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* could be used to escape the chroot() environment. Cosmopolitan Libc
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* focuses on static binaries which make chroot() infinitely easier to
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* use since you don't need to construct an entire userspace each time
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* however unveil() is still better to use on modern Linux and OpenBSD
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* because it doesn't require root privileges.
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*
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* @param path shall become the new root directory
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* @return 0 on success, or -1 w/ errno
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* @raise EACCES if we don't have permission to search a component of `path`
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* @raise ENOTDIR if a directory component in `path` exists as non-directory
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* @raise ENAMETOOLONG if symlink-resolved `path` length exceeds `PATH_MAX`
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* @raise ENAMETOOLONG if component in `path` exists longer than `NAME_MAX`
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* @raise EPERM if not root or pledge() is in play
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* @raise EIO if a low-level i/o error occurred
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* @raise EFAULT if `path` is bad memory
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* @raise ENOENT if `path` doesn't exist
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* @raise ENOSYS on Windows
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*/
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int chroot(const char *path) {
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int rc;
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if (!path || (IsAsan() && !__asan_is_valid(path, 1))) {
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rc = efault();
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} else {
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rc = sys_chroot(path);
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}
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STRACE("chroot(%s) → %d% m", path, rc);
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return rc;
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}
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