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Remove malloc() dependency on pledge() / unveil()

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This change also fixes a bug with gettid() being incorrect after fork().
We now implement the ENOENT behavior for getauxval(). The getuid() etc.
system calls are now faster too. Plus issetugid() will work on BSDs.
This commit is contained in:
Justine Tunney 2022-07-24 19:40:32 -07:00
parent c921dc78f0
commit 3d2cf95af1
33 changed files with 270 additions and 100 deletions
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47
libc/calls/issetugid.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net 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 "libc/calls/_getauxval.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/sysv/consts/auxv.h"
/**
* Determines if process is tainted.
*
* This function returns 1 if process was launched as a result of an
* execve() call on a binary that had the setuid or setgid bits set.
* FreeBSD defines tainted as including processes that changed their
* effective user / group ids at some point.
*
* @return always successful, 1 if yes, 0 if no
*/
int issetugid(void) {
int rc;
if (IsLinux()) {
rc = !!_getauxval(AT_SECURE).value;
} else if (IsMetal()) {
rc = 0;
} else {
rc = sys_issetugid();
}
STRACE("issetugid() → %d", rc);
return rc;
}