mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-16 03:07:54 +00:00
6ffed14b9c
Actually Portable Executable now supports Android. Cosmo's old mmap code required a 47 bit address space. The new implementation is very agnostic and supports both smaller address spaces (e.g. embedded) and even modern 56-bit PML5T paging for x86 which finally came true on Zen4 Threadripper Cosmopolitan no longer requires UNIX systems to observe the Windows 64kb granularity; i.e. sysconf(_SC_PAGE_SIZE) will now report the host native page size. This fixes a longstanding POSIX conformance issue, concerning file mappings that overlap the end of file. Other aspects of conformance have been improved too, such as the subtleties of address assignment and and the various subtleties surrounding MAP_FIXED and MAP_FIXED_NOREPLACE On Windows, mappings larger than 100 megabytes won't be broken down into thousands of independent 64kb mappings. Support for MAP_STACK is removed by this change; please use NewCosmoStack() instead. Stack overflow avoidance is now being implemented using the POSIX thread APIs. Please use GetStackBottom() and GetStackAddr(), instead of the old error-prone GetStackAddr() and HaveStackMemory() APIs which are removed.
254 lines
9.3 KiB
C
254 lines
9.3 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 2021 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/struct/sigaction.h"
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#include "libc/calls/ucontext.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/log/log.h"
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#include "libc/mem/gc.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/auxv.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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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/testlib/testlib.h"
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#include "libc/x/x.h"
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#include "third_party/xed/x86.h"
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volatile bool gotsegv;
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volatile bool gotbusted;
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struct sigaction old[2];
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void SetUpOnce(void) {
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testlib_enable_tmp_setup_teardown();
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}
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#ifdef __x86_64__
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static const char kRet31337[] = {
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0xb8, 0x69, 0x7a, 0x00, 0x00, // mov $31337,%eax
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0xc3, // ret
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};
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#elif defined(__aarch64__)
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static const uint32_t kRet31337[] = {
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0x528f4d20, // mov w0,#31337
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0xd65f03c0, // ret
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};
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#else
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#error "unsupported architecture"
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#endif
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void SkipOverFaultingInstruction(struct ucontext *ctx) {
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#ifdef __x86_64__
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struct XedDecodedInst xedd;
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xed_decoded_inst_zero_set_mode(&xedd, XED_MACHINE_MODE_LONG_64);
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xed_instruction_length_decode(&xedd, (void *)ctx->uc_mcontext.rip, 15);
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ctx->uc_mcontext.rip += xedd.length;
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#elif defined(__aarch64__)
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ctx->uc_mcontext.pc += 4;
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#else
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#error "unsupported architecture"
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#endif
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}
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void OnSigSegv(int sig, siginfo_t *si, void *vctx) {
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struct ucontext *ctx = vctx;
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gotsegv = true;
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SkipOverFaultingInstruction(ctx);
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}
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void OnSigBus(int sig, siginfo_t *si, void *vctx) {
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struct ucontext *ctx = vctx;
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gotbusted = true;
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SkipOverFaultingInstruction(ctx);
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#if 0
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kprintf("SIGBUS%n");
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kprintf("si->si_signo = %G%n", si->si_signo);
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kprintf("si->si_errno = %s (%d)%n", _strerrno(si->si_errno),
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si->si_errno);
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kprintf("si->si_code = %s (%d)%n", DescribeSiCode(sig, si->si_code),
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si->si_code);
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kprintf("┌si->si_addr = %p%n", si->si_addr);
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kprintf("┼─────────────────%n");
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kprintf("│si->si_pid = %d (note: getpid() is %d)%n", si->si_pid, getpid());
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kprintf("│si->si_uid = %d%n", si->si_uid);
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kprintf("┼─────────────────%n");
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kprintf("│si->si_timerid = %d%n", si->si_timerid);
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kprintf("└si->si_overrun = %d%n", si->si_overrun);
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kprintf("si->si_value.sival_int = %d%n", si->si_value.sival_int);
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kprintf("si->si_value.sival_ptr = %p%n", si->si_value.sival_ptr);
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system(xasprintf("cat /proc/%d/map", getpid()));
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#endif
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}
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void SetUp(void) {
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struct sigaction sabus = {.sa_sigaction = OnSigBus,
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.sa_flags = SA_SIGINFO | SA_RESETHAND};
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struct sigaction sasegv = {.sa_sigaction = OnSigSegv,
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.sa_flags = SA_SIGINFO | SA_RESETHAND};
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sigaction(SIGBUS, &sabus, old + 0);
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sigaction(SIGSEGV, &sasegv, old + 1);
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gotbusted = false;
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gotsegv = false;
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}
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void TearDown(void) {
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sigaction(SIGBUS, old + 0, 0);
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sigaction(SIGSEGV, old + 1, 0);
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}
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TEST(mprotect, testOkMemory) {
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char *p = gc(memalign(getauxval(AT_PAGESZ), getauxval(AT_PAGESZ)));
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p[0] = 0;
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ASSERT_NE(-1, mprotect(p, getauxval(AT_PAGESZ), PROT_READ | PROT_WRITE));
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p[0] = 1;
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EXPECT_EQ(1, p[0]);
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EXPECT_FALSE(gotsegv);
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EXPECT_FALSE(gotbusted);
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}
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TEST(mprotect, testSegfault_writeToReadOnlyAnonymous) {
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volatile char *p;
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p = gc(memalign(getauxval(AT_PAGESZ), getauxval(AT_PAGESZ)));
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EXPECT_FALSE(gotsegv);
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p[0] = 1;
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EXPECT_FALSE(gotsegv);
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EXPECT_FALSE(gotbusted);
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EXPECT_NE(-1, mprotect((void *)p, getauxval(AT_PAGESZ), PROT_READ));
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__expropriate(p[0]);
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EXPECT_FALSE(gotsegv);
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EXPECT_FALSE(gotbusted);
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p[0] = 2;
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EXPECT_TRUE(gotsegv | gotbusted);
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EXPECT_EQ(1, p[0]);
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EXPECT_NE(-1,
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mprotect((void *)p, getauxval(AT_PAGESZ), PROT_READ | PROT_WRITE));
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}
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TEST(mprotect, testExecOnly_canExecute) {
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char *p = _mapanon(__granularity());
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void (*f)(void) = (void *)p;
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memcpy(p, kRet31337, sizeof(kRet31337));
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ASSERT_SYS(0, 0, mprotect(p, __granularity(), PROT_EXEC | PROT_READ));
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f();
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// On all supported platforms, PROT_EXEC implies PROT_READ. There is
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// one exception to this rule: Chromebook's fork of the Linux kernel
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// which has been reported, to have the ability to prevent a program
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// from reading its own code.
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ASSERT_SYS(0, 0, mprotect(p, __granularity(), PROT_EXEC));
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f();
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munmap(p, __granularity());
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}
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TEST(mprotect, testProtNone_cantEvenRead) {
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volatile char *p;
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p = gc(memalign(getauxval(AT_PAGESZ), getauxval(AT_PAGESZ)));
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EXPECT_NE(-1, mprotect((void *)p, getauxval(AT_PAGESZ), PROT_NONE));
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__expropriate(p[0]);
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EXPECT_TRUE(gotsegv | gotbusted);
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EXPECT_NE(-1,
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mprotect((void *)p, getauxval(AT_PAGESZ), PROT_READ | PROT_WRITE));
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}
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TEST(mprotect, testExecJit_actuallyWorks) {
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int (*p)(void) = gc(memalign(getauxval(AT_PAGESZ), getauxval(AT_PAGESZ)));
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memcpy(p, kRet31337, sizeof(kRet31337));
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EXPECT_NE(-1, mprotect(p, getauxval(AT_PAGESZ), PROT_EXEC));
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EXPECT_EQ(31337, p());
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EXPECT_FALSE(gotsegv);
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EXPECT_FALSE(gotbusted);
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EXPECT_NE(-1, mprotect(p, getauxval(AT_PAGESZ), PROT_READ | PROT_WRITE));
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}
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TEST(mprotect, testRwxMap_vonNeumannRules) {
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if (IsOpenbsd())
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return; // boo
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if (IsXnuSilicon())
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return; // boo
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int (*p)(void) = gc(memalign(getauxval(AT_PAGESZ), getauxval(AT_PAGESZ)));
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memcpy(p, kRet31337, sizeof(kRet31337));
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EXPECT_NE(-1, mprotect(p, getauxval(AT_PAGESZ),
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PROT_READ | PROT_WRITE | PROT_EXEC));
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EXPECT_EQ(31337, p());
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EXPECT_FALSE(gotsegv);
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EXPECT_FALSE(gotbusted);
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EXPECT_NE(-1, mprotect(p, getauxval(AT_PAGESZ), PROT_READ | PROT_WRITE));
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}
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TEST(mprotect, testExecuteFlatFileMapOpenedAsReadonly) {
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if (IsXnuSilicon())
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return; // TODO(jart): Use APE Loader SIP workaround?
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int (*p)(void);
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size_t n = sizeof(kRet31337);
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ASSERT_SYS(0, 3, creat("return31337", 0755));
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ASSERT_SYS(0, n, write(3, kRet31337, n));
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ASSERT_SYS(0, 0, close(3));
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ASSERT_SYS(0, 3, open("return31337", O_RDONLY));
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EXPECT_NE(MAP_FAILED,
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(p = mmap(NULL, n, PROT_READ | PROT_EXEC, MAP_PRIVATE, 3, 0)));
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EXPECT_EQ(31337, p());
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EXPECT_FALSE(gotsegv);
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EXPECT_FALSE(gotbusted);
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ASSERT_SYS(0, 0, close(3));
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ASSERT_SYS(0, 0, munmap(p, n));
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}
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TEST(mprotect, testFileMap_canChangeToExecWhileOpenInRdwrMode) {
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int (*p)(void);
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size_t n = sizeof(kRet31337);
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ASSERT_SYS(0, 3, open("return31337", O_CREAT | O_TRUNC | O_RDWR, 0755));
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ASSERT_SYS(0, n, write(3, kRet31337, n));
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EXPECT_NE(MAP_FAILED,
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(p = mmap(NULL, n, PROT_READ | PROT_WRITE, MAP_PRIVATE, 3, 0)));
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EXPECT_NE(-1, mprotect(p, n, PROT_READ | PROT_EXEC));
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EXPECT_EQ(31337, p());
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EXPECT_FALSE(gotsegv);
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EXPECT_FALSE(gotbusted);
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ASSERT_SYS(0, 0, close(3));
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ASSERT_SYS(0, 0, munmap(p, n));
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}
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TEST(mprotect, testBadProt_failsEinval) {
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volatile char *p = gc(memalign(getauxval(AT_PAGESZ), getauxval(AT_PAGESZ)));
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EXPECT_EQ(-1, mprotect((void *)p, 9999, -1));
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EXPECT_EQ(EINVAL, errno);
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}
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TEST(mprotect, testZeroSize_doesNothing) {
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volatile char *p = gc(memalign(getauxval(AT_PAGESZ), getauxval(AT_PAGESZ)));
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EXPECT_NE(-1, mprotect((void *)p, 0, PROT_READ));
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p[0] = 1;
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EXPECT_FALSE(gotsegv);
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EXPECT_FALSE(gotbusted);
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}
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TEST(mprotect, image) {
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_Alignas(16384) static const char lol[16384] = {1, 2, 3};
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intptr_t i = (intptr_t)lol;
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asm("" : "+r"(i));
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char *p = (char *)i;
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EXPECT_SYS(0, 0, mprotect(p, 16384, PROT_READ | PROT_WRITE));
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EXPECT_EQ(2, ++p[0]);
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}
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