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45 lines
2.5 KiB
C
45 lines
2.5 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 2022 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/pledge.h"
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#include "libc/calls/pledge.internal.h"
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#include "libc/intrin/promises.h"
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#include "libc/runtime/runtime.h"
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// runs pledge at glibc executable load time, e.g.
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// strace -vff bash -c '_PLEDGE=4194303,0 LD_PRELOAD=$HOME/sandbox.so ls'
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__attribute__((__constructor__)) void init(void) {
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int c, i, j;
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const char *s;
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uint64_t arg[2] = {0};
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s = getenv("_PLEDGE");
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for (i = j = 0; i < 2; ++i) {
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while ((c = s[j] & 255)) {
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++j;
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if ('0' <= c && c <= '9') {
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arg[i] *= 10;
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arg[i] += c - '0';
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} else {
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break;
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}
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}
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}
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sys_pledge_linux(~arg[0], arg[1]);
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}
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