mirror of
https://github.com/jart/cosmopolitan.git
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6e6fc38935
Commit bc6c183 introduced a bunch of discrepancies between what files
look like in the repo and what clang-format says they should look like.
However, there were already a few discrepancies prior to that. Most of
these discrepancies seemed to be unintentional, but a few of them were
load-bearing (e.g., a #include that violated header ordering needing
something to have been #defined by a 'later' #include.)
I opted to take what I hope is a relatively smooth-brained approach: I
reverted the .clang-format change, ran clang-format on the whole repo,
reapplied the .clang-format change, reran clang-format again, and then
reverted the commit that contained the first run. Thus the full effect
of this PR should only be to apply the changed formatting rules to the
repo, and from skimming the results, this seems to be the case.
My work can be checked by applying the short, manual commits, and then
rerunning the command listed in the autogenerated commits (those whose
messages I have prefixed auto:) and seeing if your results agree.
It might be that the other diffs should be fixed at some point but I'm
leaving that aside for now.
fd '\.c(c|pp)?$' --print0| xargs -0 clang-format -i
245 lines
9 KiB
C
245 lines
9 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, struct siginfo *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, struct siginfo *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(FRAMESIZE);
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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, FRAMESIZE, 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, FRAMESIZE, PROT_EXEC));
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f();
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munmap(p, FRAMESIZE);
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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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