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https://github.com/jart/cosmopolitan.git
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8f12cd980d
The longjmp relocation in the master boot record coincidentally had a quote character in it, which caused the master boot record to be used when interpreter by the shell. The solution, is to move the grub stub below the long mode loader so the real mode loader relocation is near the master boot record. This change includes a regression test.
128 lines
4.8 KiB
C
128 lines
4.8 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/calls.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/errno.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/mem/io.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/testlib/testlib.h"
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STATIC_YOINK("zip_uri_support");
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STATIC_YOINK("apetest.com");
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STATIC_YOINK("apetest2.com");
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char testlib_enable_tmp_setup_teardown_once;
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void Extract(const char *from, const char *to, int mode) {
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ASSERT_SYS(0, 3, open(from, O_RDONLY));
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ASSERT_SYS(0, 4, creat(to, mode));
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ASSERT_NE(-1, _copyfd(3, 4, -1));
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EXPECT_SYS(0, 0, close(4));
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EXPECT_SYS(0, 0, close(3));
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}
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void SetUpOnce(void) {
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// nothing to do if we're using elf
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if (~SUPPORT_VECTOR & (WINDOWS | XNU)) {
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exit(0);
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}
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ASSERT_SYS(0, 0, mkdir("bin", 0755));
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Extract("/zip/apetest.com", "bin/apetest.com", 0755);
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Extract("/zip/apetest2.com", "bin/apetest2.com", 0755);
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// force the extraction of ape payload
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// if system does not have binfmt_misc
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ASSERT_SYS(0, 0, mkdir("tmp", 0755));
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setenv("TMPDIR", "tmp", true);
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}
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void RunApeTest(const char *path) {
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size_t n;
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ssize_t rc, got;
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char buf[512] = {0};
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sigset_t chldmask, savemask;
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int i, pid, fdin, wstatus, pfds[2];
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struct sigaction ignore, saveint, savequit, savepipe;
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ignore.sa_flags = 0;
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ignore.sa_handler = SIG_IGN;
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sigemptyset(&ignore.sa_mask);
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sigaction(SIGINT, &ignore, &saveint);
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sigaction(SIGQUIT, &ignore, &savequit);
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sigaction(SIGPIPE, &ignore, &savepipe);
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sigemptyset(&chldmask);
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sigaddset(&chldmask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &chldmask, &savemask);
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ASSERT_SYS(0, 0, pipe2(pfds, O_CLOEXEC));
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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__strace = 0;
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__ftrace = 0;
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close(1);
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dup(pfds[1]);
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sigaction(SIGINT, &saveint, 0);
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sigaction(SIGQUIT, &savequit, 0);
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sigaction(SIGPIPE, &savepipe, 0);
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sigprocmask(SIG_SETMASK, &savemask, 0);
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execv(path, (char *const[]){path, 0});
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_Exit(127);
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}
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close(pfds[1]);
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EXPECT_SYS(0, 8, read(pfds[0], buf, sizeof(buf)));
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EXPECT_STREQ("success\n", buf);
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close(pfds[0]);
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EXPECT_NE(-1, wait(&wstatus));
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EXPECT_TRUE(WIFEXITED(wstatus));
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EXPECT_EQ(0, WEXITSTATUS(wstatus));
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sigaction(SIGINT, &saveint, 0);
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sigaction(SIGQUIT, &savequit, 0);
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sigaction(SIGPIPE, &savepipe, 0);
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sigprocmask(SIG_SETMASK, &savemask, 0);
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EXPECT_SYS(0, 3, open(path, O_RDONLY));
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EXPECT_SYS(0, 6, read(3, buf, 6));
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EXPECT_SYS(0, 0, close(3));
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EXPECT_STREQN("MZqFpD", buf, 6);
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}
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TEST(ape, noAccidentalQuotesInMasterBootRecord) {
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int i, quotes = 0;
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char buf[512] = {0};
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EXPECT_SYS(0, 3, open("bin/apetest.com", O_RDONLY));
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EXPECT_SYS(0, 512, read(3, buf, 512));
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EXPECT_SYS(0, 0, close(3));
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for (i = 0; i < 512; ++i) {
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if (buf[i] == '\'') {
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++quotes;
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}
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}
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EXPECT_EQ(1, quotes);
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}
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TEST(apeNoModifySelf, runsWithoutModifyingSelf) {
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RunApeTest("bin/apetest.com");
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}
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TEST(apeCopySelf, runsWithoutModifyingSelf) {
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RunApeTest("bin/apetest2.com");
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}
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