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Fix bugs and add security features to redbean

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- Fix a regression with the previous change that broke redbean
- Add chroot(), resource limit, seccomp, and other stuff to redbean
- Write lots and lots of documentation
- Iron out more system call issues
This commit is contained in:
Justine Tunney 2022-04-18 00:01:26 -07:00
parent f1dfa4bdfa
commit 7166679620
182 changed files with 1855 additions and 918 deletions
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52
libc/calls/prctl.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 2022 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/calls.h"
#include "libc/calls/strace.internal.h"
#include "libc/errno.h"
#include "libc/sysv/errfuns.h"
/**
* Tunes process on Linux.
*
* @raise ENOSYS on non-Linux.
*/
int prctl(int operation, ...) {
int rc;
va_list va;
intptr_t a, b;
register intptr_t c asm("r10");
register intptr_t d asm("r8");
va_start(va, operation);
a = va_arg(va, intptr_t);
b = va_arg(va, intptr_t);
c = va_arg(va, intptr_t);
d = va_arg(va, intptr_t);
va_end(va);
if (IsLinux()) {
asm volatile("syscall"
: "=a"(rc)
: "0"(157), "D"(operation), "S"(a), "d"(b), "r"(c), "r"(d)
: "rcx", "r11", "memory");
if (rc > -4096u) errno = -rc, rc = -1;
} else {
rc = enosys();
}
STRACE("seccomp(%d, %p, %p, %p, %p) → %d% m", operation, a, b, c, d, rc);
return rc;
}