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https://github.com/jart/cosmopolitan.git
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d1d4388201
It hasn't been helpful enough to be justify the maintenance burden. What actually does help is mprotect(), kprintf(), --ftrace and --strace which can always be counted upon to work correctly. We aren't losing much with this change. Support for ASAN on AARCH64 was never implemented. Applying ASAN to the core libc runtimes was disabled many months ago. If there is some way to have an ASAN runtime for user programs that is less invasive we can potentially consider reintroducing support. But now is premature.
79 lines
4 KiB
C
79 lines
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 et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 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/internal.h"
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#include "libc/calls/syscall-nt.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/intrin/describeflags.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/runtime/zipos.internal.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/ok.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Checks if effective user can access path in particular ways.
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*
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* @param dirfd is normally AT_FDCWD but if it's an open directory and
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* file is a relative path, then file is opened relative to dirfd
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* @param path is a filename or directory
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* @param amode can be `R_OK`, `W_OK`, `X_OK`, or `F_OK`
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* @param flags can have `AT_EACCESS` and/or `AT_SYMLINK_NOFOLLOW`
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* @return 0 if ok, or -1 and sets errno
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* @raise EINVAL if `amode` or `flags` had invalid values
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* @raise EPERM if pledge() is in play without rpath promise
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* @raise EACCES if access for requested `amode` would be denied
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* @raise ENOTDIR if a directory component in `path` exists as non-directory
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* @raise ENOENT if component of `path` doesn't exist or `path` is empty
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* @raise ENOTSUP if `path` is a zip file and `dirfd` isn't `AT_FDCWD`
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* @note on Linux `flags` is only supported on Linux 5.8+
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* @asyncsignalsafe
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*/
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int faccessat(int dirfd, const char *path, int amode, int flags) {
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int e, rc;
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struct ZiposUri zipname;
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if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EACCESS)) ||
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!(amode == F_OK || !(amode & ~(R_OK | W_OK | X_OK)))) {
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rc = einval();
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} else if (__isfdkind(dirfd, kFdZip)) {
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rc = enotsup();
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} else if (_weaken(__zipos_open) &&
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_weaken(__zipos_parseuri)(path, &zipname) != -1) {
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rc = _weaken(__zipos_access)(&zipname, amode);
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} else if (!IsWindows()) {
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e = errno;
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if (!flags)
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goto NoFlags;
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if ((rc = sys_faccessat2(dirfd, path, amode, flags)) == -1) {
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if (errno == ENOSYS) {
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errno = e;
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NoFlags:
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rc = sys_faccessat(dirfd, path, amode, flags);
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}
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}
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} else {
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rc = sys_faccessat_nt(dirfd, path, amode, flags);
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}
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STRACE("faccessat(%s, %#s, %#o, %#x) → %d% m", DescribeDirfd(dirfd), path,
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amode, flags, rc);
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return rc;
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}
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