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Rewrite Linux pledge() code so it can be a payload

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It's now possible to build our pledge() polyfill as a dynamic shared
object that can be injected into a glibc executable using LD_PRELOAD
This commit is contained in:
Justine Tunney 2022-08-08 11:41:08 -07:00
parent 7bd4179b9b
commit 0277d7d6e9
37 changed files with 1980 additions and 1600 deletions
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66
libc/calls/parsepromises.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/pledge.internal.h"
#include "libc/macros.internal.h"
#include "libc/str/str.h"
static int FindPromise(const char *name) {
int i;
for (i = 0; i < ARRAYLEN(kPledge); ++i) {
if (!strcasecmp(name, kPledge[i].name)) {
return i;
}
}
return -1;
}
/**
* Parses the arguments to pledge() into a bitmask.
*
* @return 0 on success, or -1 if invalid
*/
int ParsePromises(const char *promises, unsigned long *out) {
int rc = 0;
int promise;
unsigned long ipromises;
char *tok, *state, *start, buf[256];
if (promises) {
ipromises = -1;
if (memccpy(buf, promises, 0, sizeof(buf))) {
start = buf;
while ((tok = strtok_r(start, " \t\r\n", &state))) {
if ((promise = FindPromise(tok)) != -1) {
ipromises &= ~(1ULL << promise);
} else {
rc = -1;
break;
}
start = 0;
}
} else {
rc = -1;
}
} else {
ipromises = 0;
}
if (!rc) {
*out = ipromises;
}
return rc;
}