mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
81 lines
3.2 KiB
C
81 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/blockcancel.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/elf/def.h"
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#include "libc/elf/elf.h"
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#include "libc/elf/struct/ehdr.h"
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#include "libc/elf/struct/phdr.h"
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#include "libc/errno.h"
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#include "libc/intrin/bits.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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/**
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* Returns true if ELF executable uses dynamic loading magic.
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*/
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bool _IsDynamicExecutable(const char *prog) {
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bool res;
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Elf64_Ehdr *e;
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Elf64_Phdr *p;
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struct stat st;
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int i, fd, err;
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BLOCK_CANCELLATIONS;
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fd = -1;
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err = errno;
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e = MAP_FAILED;
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if ((fd = open(prog, O_RDONLY)) == -1) {
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res = false;
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goto Finish;
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}
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if (fstat(fd, &st) == -1 || st.st_size < 64) {
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res = false;
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goto Finish;
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}
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if ((e = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
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res = false;
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goto Finish;
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}
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if (READ32LE(e->e_ident) != READ32LE(ELFMAG)) {
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res = false;
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goto Finish;
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}
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if (e->e_type == ET_DYN) {
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res = true;
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goto Finish;
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}
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for (i = 0; i < e->e_phnum; ++i) {
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p = GetElfSegmentHeaderAddress(e, st.st_size, i);
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if (p->p_type == PT_INTERP || p->p_type == PT_DYNAMIC) {
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res = true;
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goto Finish;
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}
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}
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res = false;
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goto Finish;
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Finish:
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if (e != MAP_FAILED) munmap(e, st.st_size);
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if (fd != -1) close(fd);
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errno = err;
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ALLOW_CANCELLATIONS;
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return res;
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}
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