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Remove some problematic APIs

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In order to improve our chances of success building other open source
projects we shouldn't define APIs that'll lead any ./configure script
astray. For example:

- brk() and sbrk() can break mac/windows support
- syscall() is a superb way to break portability
- arch_prctl() is the greatest of all horror shows
This commit is contained in:
Justine Tunney 2023-06-08 06:12:26 -07:00
parent 7512318a2a
commit 32682f0ce7
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GPG key ID: BE714B4575D6E328
24 changed files with 37 additions and 919 deletions
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131
test/libc/runtime/arch_prctl_test.c
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@ -1,131 +0,0 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/fsgsbase.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/segmentation.h"
#include "libc/nt/version.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/tls.h"
#ifdef __x86_64__
void SetUpOnce(void) {
__tls_enabled_set(false);
ASSERT_SYS(0, 0, pledge("stdio rpath", 0));
}
void OnTrap(int sig, struct siginfo *si, void *vctx) {
struct ucontext *ctx = vctx;
}
void TriggerSignal(void) {
struct sigaction old;
struct sigaction sig = {.sa_sigaction = OnTrap, .sa_flags = SA_SIGINFO};
sched_yield();
sigaction(SIGTRAP, &sig, &old);
asm("int3");
sigaction(SIGTRAP, &old, 0);
sched_yield();
}
TEST(arch_prctl, fs) {
if (IsLinux() || IsFreebsd() || IsNetbsd() || IsOpenbsd()) {
uint64_t n, x;
x = 0xdeadbeef;
arch_prctl(ARCH_SET_FS, &x);
ASSERT_NE(-1, arch_prctl(ARCH_GET_FS, (intptr_t)&n));
ASSERT_EQ((intptr_t)&x, n);
ASSERT_EQ(0xdeadbeef, fs((int64_t *)0));
TriggerSignal();
ASSERT_EQ(0xdeadbeef, fs((int64_t *)0));
}
}
TEST(arch_prctl, pointerRebasingFs) {
if (IsLinux() || IsFreebsd() || IsOpenbsd() || IsNetbsd()) {
unsigned long s[] = {0x0706050403020100, 0x0f0e0d0c0b0a0908};
ASSERT_EQ(0x0706050403020100, s[0]);
ASSERT_EQ(0, arch_prctl(ARCH_SET_FS, 1));
ASSERT_EQ(0x0807060504030201, fs(&s[0]));
ASSERT_EQ(0, arch_prctl(ARCH_SET_FS, 2));
ASSERT_EQ(0x0908070605040302, fs(&s[0]));
intptr_t fs;
ASSERT_EQ(0, arch_prctl(ARCH_GET_FS, &fs));
ASSERT_EQ(2, fs);
}
}
TEST(arch_prctl, gs) {
if (IsLinux() || IsFreebsd() || IsNetbsd() || IsXnu()) {
uint64_t n, x;
x = 0xdeadbeef;
arch_prctl(ARCH_SET_GS, &x);
if (!IsXnu()) {
ASSERT_NE(-1, arch_prctl(ARCH_GET_GS, (intptr_t)&n));
ASSERT_EQ((intptr_t)&x, n);
}
ASSERT_EQ(0xdeadbeef, gs((int64_t *)0));
TriggerSignal();
ASSERT_EQ(0xdeadbeef, gs((int64_t *)0));
}
}
TEST(arch_prctl, pointerRebasing) {
if (IsLinux() || IsFreebsd() || IsNetbsd() || IsXnu()) {
unsigned long s[] = {0x0706050403020100, 0x0f0e0d0c0b0a0908};
ASSERT_EQ(0x0706050403020100, s[0]);
ASSERT_EQ(0, arch_prctl(ARCH_SET_GS, 1));
ASSERT_EQ(0x0807060504030201, gs(&s[0]));
ASSERT_EQ(0, arch_prctl(ARCH_SET_GS, 2));
ASSERT_EQ(0x0908070605040302, gs(&s[0]));
if (!IsXnu()) {
intptr_t gs;
ASSERT_EQ(0, arch_prctl(ARCH_GET_GS, &gs));
ASSERT_EQ(2, gs);
}
}
}
TEST(fsgsbase, fs) {
if (!_have_fsgsbase()) return;
int64_t mem = 0xdeadbeef;
_wrfsbase(&mem);
ASSERT_EQ(&mem, _rdfsbase());
ASSERT_EQ(0xdeadbeef, fs((int64_t *)0));
TriggerSignal();
ASSERT_EQ(0xdeadbeef, fs((int64_t *)0));
}
TEST(fsgsbase, gs) {
if (!_have_fsgsbase()) return;
int64_t mem = 0xdeadbeef;
_wrgsbase(&mem);
ASSERT_EQ(&mem, _rdgsbase());
ASSERT_EQ(0xdeadbeef, gs((int64_t *)0));
TriggerSignal();
ASSERT_EQ(0xdeadbeef, gs((int64_t *)0));
}
#endif /* __x86_64__ */