mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-31 09:42:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Initial import

Browse source
This commit is contained in:
Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
14915 changed files with 590219 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

105
test/libc/runtime/balloc_test.c Normal file
View file

@ -0,0 +1,105 @@
/*-*- 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 │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/safemacros.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/ucontext.h"
#include "libc/runtime/buffer.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/sysv/consts/prot.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
#include "libc/x/x.h"
#include "third_party/xed/x86.h"
char *p;
bool segfaulted_;
struct GuardedBuffer b_;
struct sigaction oldsegv_;
struct XedDecodedInst xedd_;
void RestrictPage(void *addr, unsigned flags) {
addr = (void *)rounddown((intptr_t)addr, PAGESIZE);
EXPECT_NE(-1, mprotect(addr, PAGESIZE, flags));
}
void OnSegLol(int sig, struct siginfo *si, struct ucontext *uc) {
size_t i;
uint8_t *rip;
segfaulted_ = true;
rip = (uint8_t *)uc->uc_mcontext.rip;
RestrictPage(rip, PROT_READ | PROT_WRITE | PROT_EXEC);
ASSERT_EQ(XED_ERROR_NONE,
xed_instruction_length_decode(xed_decoded_inst_zero_set_mode(
&xedd_, XED_MACHINE_MODE_LONG_64),
rip, XED_MAX_INSTRUCTION_BYTES));
for (i = 0; i < xedd_.decoded_length; ++i) rip[i] = 0x90; /* NOP */
RestrictPage(rip, PROT_READ | PROT_EXEC);
}
void SetUp(void) {
segfaulted_ = false;
memset(&b_, 0, sizeof(b_));
ASSERT_NE(-1, xsigaction(SIGSEGV, OnSegLol, SA_RESETHAND | SA_RESTART, 0,
&oldsegv_));
}
void TearDown(void) {
EXPECT_NE(-1, sigaction(SIGSEGV, &oldsegv_, NULL));
bfree(&b_);
EXPECT_EQ(NULL, b_.p);
}
TEST(balloc, createsGuardPage) {
ASSERT_NE(NULL, (p = balloc(&b_, 1, 1)));
EXPECT_EQ(p, b_.p);
p[0] = '.';
ASSERT_FALSE(segfaulted_);
/* TODO(jart): fix me!!! */
/* p[1 + __BIGGEST_ALIGNMENT__] = '!'; */
/* EXPECT_TRUE(segfaulted_); */
}
TEST(balloc, aligned_roundsUp) {
ASSERT_NE(NULL, (p = balloc(&b_, 128, 1)));
EXPECT_EQ(0, (intptr_t)b_.p & 127);
p[127] = '.';
ASSERT_FALSE(segfaulted_);
/* TODO(jart): fix me!!! */
/* p[128 + __BIGGEST_ALIGNMENT__] = '!'; */
/* EXPECT_TRUE(segfaulted_); */
}
TEST(balloc, multipleCalls_avoidsNeedlessSyscalls) {
size_t c;
c = g_syscount;
ASSERT_NE(NULL, (p = balloc(&b_, 1, 31337)));
EXPECT_GT(g_syscount, c);
c = g_syscount;
ASSERT_NE(NULL, (p = balloc(&b_, 1, 31337 / 2)));
EXPECT_EQ(g_syscount, c);
c = g_syscount;
ASSERT_NE(NULL, (p = balloc(&b_, 1, 31337 * 2)));
EXPECT_GT(g_syscount, c);
}