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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.
75 lines
3.7 KiB
C
75 lines
3.7 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 2021 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/blockcancel.internal.h"
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#include "libc/calls/calls.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/errfuns.h"
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int sys_fchmodat_linux(int, const char *, unsigned, int);
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int sys_fchmodat2(int, const char *, unsigned, int);
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/**
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* Changes permissions on file, e.g.:
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*
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "foo/bar.txt", 0644));
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "o/default/program", 0755));
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "privatefolder/", 0700));
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*
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* @param path must exist
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* @param mode contains octal flags (base 8)
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* @param flags can have `AT_SYMLINK_NOFOLLOW`
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* @raise EROFS if `dirfd` or `path` use zip file system
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* @raise EOPNOTSUP on Linux if `path` is a symbolic link, `AT_SYMLINK_NOFOLLOW`
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* is set in `flags`, and filesystem does not support setting the mode of
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* symbolic links.
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* @errors ENOENT, ENOTDIR, ENOSYS
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* @asyncsignalsafe
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* @see fchmod()
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*/
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int fchmodat(int dirfd, const char *path, uint32_t mode, int flags) {
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int rc;
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if (_weaken(__zipos_notat) && (rc = __zipos_notat(dirfd, path)) == -1) {
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rc = erofs();
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} else if (!IsWindows()) {
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if (IsLinux() && flags) {
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int serrno = errno;
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rc = sys_fchmodat2(dirfd, path, mode, flags);
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if (rc == -1 && errno == ENOSYS) {
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errno = serrno;
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BLOCK_CANCELATION;
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rc = sys_fchmodat_linux(dirfd, path, mode, flags);
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ALLOW_CANCELATION;
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}
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} else {
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rc = sys_fchmodat(dirfd, path, mode, flags);
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}
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} else {
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rc = sys_fchmodat_nt(dirfd, path, mode, flags);
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}
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STRACE("fchmodat(%s, %#s, %#o, %d) → %d% m", DescribeDirfd(dirfd), path, mode,
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flags, rc);
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return rc;
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}
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