mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
98254a7c1f
This change reconciles our pledge() implementation with the OpenBSD
kernel source code. We now a polyfill that's much closer to OpenBSD's
behavior. For example, it was discovered that "stdio" permits threads.
There were a bunch of Linux system calls that needed to be added, like
sched_yield(). The exec / execnative category division is now dropped.
We're instead using OpenBSD's "prot_exec" promise for launching APE
binaries and dynamic shared objects. We also now filter clone() flags.
The pledge.com command has been greatly improved. It now does unveiling
by default when Landlock is available. It's now smart enough to unveil a
superset of paths that OpenBSD automatically unveils with pledge(), such
as /etc/localtime. pledge.com also now checks if the executable being
launched is a dynamic shared object, in which case it unveils libraries.
These changes now make it possible to pledge curl on ubuntu 20.04 glibc:
pledge.com -p 'stdio rpath prot_exec inet dns tty sendfd recvfd' \
curl -s https://justine.lol/hello.txt
Here's what pledging curl on Alpine 3.16 with Musl Libc looks like:
pledge.com -p 'stdio rpath prot_exec dns inet' \
curl -s https://justine.lol/hello.txt
Here's what pledging curl.com w/ ape loader looks like:
pledge.com -p 'stdio rpath prot_exec dns inet' \
o//examples/curl.com https://justine.lol/hello.txt
The most secure sandbox, is curl.com converted to static ELF:
o//tool/build/assimilate.com o//examples/curl.com
pledge.com -p 'stdio rpath dns inet' \
o//examples/curl.com https://justine.lol/hello.txt
A weird corner case needed to be handled when resolving symbolic links
during the unveiling process, that's arguably a Landlock bug. It's not
surprising since Musl and Glibc are also inconsistent here too.
583 lines
19 KiB
C
583 lines
19 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/internal.h"
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#include "libc/calls/ioctl.h"
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#include "libc/calls/struct/bpf.h"
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#include "libc/calls/struct/filter.h"
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#include "libc/calls/struct/flock.h"
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#include "libc/calls/struct/seccomp.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/io.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/af.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/fio.h"
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#include "libc/sysv/consts/ipproto.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/nrlinux.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/pr.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/consts/sock.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/spawn.h"
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#include "libc/time/time.h"
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STATIC_YOINK("zip_uri_support");
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char testlib_enable_tmp_setup_teardown;
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void OnSig(int sig) {
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// do nothing
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}
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int memfd_secret(unsigned int); // our ENOSYS threshold
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int extract(const char *from, const char *to, int mode) {
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int fdin, fdout;
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if ((fdin = open(from, O_RDONLY)) == -1) return -1;
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if ((fdout = creat(to, mode)) == -1) {
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close(fdin);
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return -1;
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}
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if (_copyfd(fdin, fdout, -1) == -1) {
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close(fdout);
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close(fdin);
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return -1;
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}
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return close(fdout) | close(fdin);
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}
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void SetUp(void) {
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if (!__is_linux_2_6_23() && !IsOpenbsd()) exit(0);
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ASSERT_SYS(0, 0, extract("/zip/life.elf", "life.elf", 0755));
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ASSERT_SYS(0, 0, extract("/zip/sock.elf", "sock.elf", 0755));
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}
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TEST(pledge, default_allowsExit) {
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int *job;
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int ws, pid;
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// create small shared memory region
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ASSERT_NE(-1, (job = mmap(0, FRAMESIZE, PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_ANONYMOUS, -1, 0)));
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job[0] = 2; // create workload
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job[1] = 2;
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ASSERT_NE(-1, (pid = fork())); // create enclaved worker
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("", 0));
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job[0] = job[0] + job[1]; // do work
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws)); // wait for worker
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EXPECT_TRUE(WIFEXITED(ws));
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EXPECT_EQ(0, WEXITSTATUS(ws));
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EXPECT_EQ(4, job[0]); // check result
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EXPECT_SYS(0, 0, munmap(job, FRAMESIZE));
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}
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int Enclave(void *arg, int tid) {
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ASSERT_SYS(0, 0, pledge("", 0));
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int *job = arg; // get job
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job[0] = job[0] + job[1]; // do work
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return 0; // exit
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}
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TEST(pledge, withThreadMemory) {
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if (IsOpenbsd()) return; // openbsd doesn't allow it, wisely
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struct spawn worker;
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int job[2] = {2, 2}; // create workload
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ASSERT_SYS(0, 0, _spawn(Enclave, job, &worker)); // create worker
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ASSERT_SYS(0, 0, _join(&worker)); // wait for exit
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EXPECT_EQ(4, job[0]); // check result
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}
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TEST(pledge, stdio_forbidsOpeningPasswd1) {
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if (!IsLinux()) return;
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio", 0));
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ASSERT_SYS(EPERM, -1, open("/etc/passwd", O_RDWR));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws));
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EXPECT_EQ(0, WEXITSTATUS(ws));
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}
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TEST(pledge, stdio_forbidsOpeningPasswd2) {
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if (!IsOpenbsd()) return;
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio", 0));
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ASSERT_SYS(EPERM, -1, open("/etc/passwd", O_RDWR));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFSIGNALED(ws));
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EXPECT_EQ(SIGABRT, WTERMSIG(ws));
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}
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TEST(pledge, multipleCalls_canOnlyBecomeMoreRestrictive1) {
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if (IsOpenbsd()) return;
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio", 0));
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ASSERT_SYS(0, 0, pledge("stdio unix", 0));
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ASSERT_SYS(0, 3, dup(2));
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ASSERT_SYS(EPERM, -1, socket(AF_UNIX, SOCK_STREAM, 0));
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ASSERT_SYS(0, 2, prctl(PR_GET_SECCOMP, 0, 0));
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ASSERT_SYS(0, 0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
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ASSERT_SYS(EINVAL, -1, prctl(PR_SET_NO_NEW_PRIVS, 0, 0, 0, 0));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws));
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EXPECT_EQ(0, WEXITSTATUS(ws));
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}
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TEST(pledge, multipleCalls_canOnlyBecomeMoreRestrictive2) {
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if (!IsOpenbsd()) return;
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio", "stdio"));
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ASSERT_SYS(EPERM, -1, pledge("stdio unix", "stdio unix"));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws));
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EXPECT_EQ(0, WEXITSTATUS(ws));
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}
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TEST(pledge, multipleCalls_canOnlyBecomeMoreRestrictive3) {
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if (!IsOpenbsd()) return;
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio unix", 0));
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ASSERT_SYS(0, 0, pledge("stdio", 0));
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ASSERT_SYS(0, 3, dup(2));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws));
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EXPECT_EQ(0, WEXITSTATUS(ws));
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}
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TEST(pledge, stdio_fcntl_allowsSomeFirstArgs) {
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if (IsOpenbsd()) return; // b/c testing linux bpf
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int ws, pid;
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struct flock lk;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio inet", 0));
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ASSERT_SYS(0, 0, pledge("stdio", 0));
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ASSERT_NE(-1, fcntl(0, F_GETFL));
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ASSERT_SYS(0, 0, fcntl(0, F_GETFD));
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ASSERT_SYS(0, 3, fcntl(2, F_DUPFD_CLOEXEC, 3));
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ASSERT_SYS(0, 0, ioctl(0, FIOCLEX, 0));
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ASSERT_SYS(EPERM, 0, isatty(0));
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ASSERT_SYS(EPERM, -1, fcntl(0, -1));
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ASSERT_SYS(EPERM, -1, fcntl(0, F_GETLK, &lk));
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ASSERT_SYS(EPERM, -1, fcntl(0, F_NOTIFY));
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ASSERT_SYS(EPERM, -1, socket(AF_INET, SOCK_STREAM, IPPROTO_TCP));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
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}
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TEST(pledge, stdioTty_sendtoRestricted_requiresNullAddr) {
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if (IsOpenbsd()) return; // b/c testing linux bpf
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int ws, pid, sv[2];
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ASSERT_SYS(0, 0, socketpair(AF_UNIX, SOCK_STREAM, 0, sv));
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio tty", 0));
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ASSERT_SYS(0, 5, send(sv[0], "hello", 5, 0));
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ASSERT_SYS(0, 5, sendto(sv[0], "hello", 5, 0, 0, 0));
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isatty(0);
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ASSERT_NE(EPERM, errno);
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errno = 0;
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// set lower 32-bit word of pointer to zero lool
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struct sockaddr_in *sin =
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mmap((void *)0x300000000000, FRAMESIZE, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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sin->sin_family = AF_INET;
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ASSERT_SYS(EPERM, -1, sendto(sv[0], "hello", 5, 0, sin, sizeof(*sin)));
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_Exit(0);
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}
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close(sv[0]);
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close(sv[1]);
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
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}
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TEST(pledge, unix_forbidsInetSockets) {
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if (IsOpenbsd()) return; // b/c testing linux bpf
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio unix", 0));
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ASSERT_SYS(0, 3, socket(AF_UNIX, SOCK_STREAM, 0));
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ASSERT_SYS(0, 4, socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0));
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ASSERT_SYS(EPERM, -1, socket(AF_INET, SOCK_STREAM, IPPROTO_TCP));
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ASSERT_SYS(EPERM, -1, socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP));
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ASSERT_SYS(EPERM, -1, socket(AF_UNIX, SOCK_RAW, 0));
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ASSERT_SYS(EPERM, -1, socket(AF_UNIX, SOCK_STREAM, 1));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
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}
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TEST(pledge, inet_forbidsOtherSockets) {
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if (IsOpenbsd()) return; // b/c testing linux bpf
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio inet", 0));
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ASSERT_SYS(0, 3, socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP));
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ASSERT_SYS(0, 4, socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP));
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ASSERT_SYS(0, 5, socket(AF_INET, SOCK_STREAM, IPPROTO_TCP));
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ASSERT_SYS(0, 6, socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP));
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ASSERT_SYS(0, 7, socket(AF_INET6, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP));
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ASSERT_SYS(EPERM, -1, socket(AF_UNIX, SOCK_STREAM, 0));
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ASSERT_SYS(EPERM, -1, socket(AF_BLUETOOTH, SOCK_DGRAM, IPPROTO_UDP));
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ASSERT_SYS(EPERM, -1, socket(AF_INET, SOCK_RAW, IPPROTO_UDP));
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ASSERT_SYS(EPERM, -1, socket(AF_INET, SOCK_DGRAM, IPPROTO_RAW));
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struct sockaddr_in sin = {AF_INET, 0, {htonl(0x7f000001)}};
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ASSERT_SYS(0, 0, bind(4, &sin, sizeof(sin)));
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uint32_t az = sizeof(sin);
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ASSERT_SYS(0, 0, getsockname(4, &sin, &az));
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ASSERT_SYS(0, 5, sendto(3, "hello", 5, 0, &sin, sizeof(sin)));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
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}
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TEST(pledge, mmap) {
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if (IsOpenbsd()) return; // b/c testing linux bpf
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char *p;
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio", 0));
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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ASSERT_SYS(0, 0, mprotect(p, FRAMESIZE, PROT_READ));
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ASSERT_SYS(EPERM, MAP_FAILED,
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mprotect(p, FRAMESIZE, PROT_READ | PROT_EXEC));
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ASSERT_SYS(EPERM, MAP_FAILED,
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mmap(0, FRAMESIZE, PROT_EXEC | PROT_READ,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
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}
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TEST(pledge, mmapProtExec) {
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if (IsOpenbsd()) return; // b/c testing linux bpf
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char *p;
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int ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio prot_exec", 0));
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ASSERT_NE(MAP_FAILED, (p = mmap(0, FRAMESIZE, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
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ASSERT_SYS(0, 0, mprotect(p, FRAMESIZE, PROT_READ));
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ASSERT_SYS(0, 0, mprotect(p, FRAMESIZE, PROT_READ | PROT_EXEC));
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ASSERT_NE(MAP_FAILED, mmap(0, FRAMESIZE, PROT_EXEC | PROT_READ,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
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}
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TEST(pledge, msyscall) {
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if (IsOpenbsd()) return; // b/c testing linux bpf
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int ax, ws, pid;
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio", 0));
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// now issue authorized syscall where rip isn't privileged
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asm volatile("syscall"
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: "=a"(ax)
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: "0"(__NR_linux_dup), "D"(2)
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: "rcx", "r11", "memory");
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_Exit(1);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFSIGNALED(ws));
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EXPECT_EQ(SIGSYS, WTERMSIG(ws));
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}
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TEST(pledge, chmod_ignoresDangerBits) {
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if (IsOpenbsd()) return; // b/c testing linux bpf
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int ws, pid;
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ASSERT_SYS(0, 3, creat("foo", 0644));
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio rpath wpath", 0));
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ASSERT_SYS(0, 0, fchmod(3, 00700));
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ASSERT_SYS(0, 0, chmod("foo", 00700));
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ASSERT_SYS(0, 0, fchmodat(AT_FDCWD, "foo", 00700, 0));
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ASSERT_SYS(EPERM, -1, fchmod(3, 07700));
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ASSERT_SYS(EPERM, -1, chmod("foo", 04700));
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ASSERT_SYS(EPERM, -1, fchmodat(AT_FDCWD, "foo", 02700, 0));
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_Exit(0);
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}
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EXPECT_NE(-1, wait(&ws));
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EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
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close(3);
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|
}
|
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TEST(pledge, open_rpath) {
|
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if (IsOpenbsd()) return; // b/c testing linux bpf
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int ws, pid;
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struct stat st;
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ASSERT_SYS(0, 0, touch("foo", 0644));
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ASSERT_NE(-1, (pid = fork()));
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if (!pid) {
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ASSERT_SYS(0, 0, pledge("stdio rpath", 0));
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|
ASSERT_SYS(0, 3, open("foo", O_RDONLY));
|
|
ASSERT_SYS(EPERM, -1, open("foo", O_RDWR | O_TRUNC | O_CREAT, 0644));
|
|
ASSERT_SYS(EPERM, -1, open("foo", O_WRONLY | O_TRUNC | O_CREAT, 0644));
|
|
_Exit(0);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge, open_wpath) {
|
|
if (IsOpenbsd()) return; // b/c testing linux bpf
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_SYS(0, 0, touch("foo", 0644));
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio wpath", 0));
|
|
ASSERT_SYS(0, 3, open("foo", O_RDONLY));
|
|
ASSERT_SYS(EPERM, -1, open(".", O_RDWR | O_TMPFILE, 07644));
|
|
ASSERT_SYS(0, 4, open("foo", O_WRONLY | O_TRUNC, 07644));
|
|
ASSERT_SYS(EPERM, -1, open("foo", O_WRONLY | O_TRUNC | O_CREAT, 0644));
|
|
_Exit(0);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge, open_cpath) {
|
|
if (IsOpenbsd()) return; // b/c testing linux bpf
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_SYS(0, 0, touch("foo", 0644));
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio cpath", 0));
|
|
ASSERT_SYS(0, 3, open("foo", O_WRONLY | O_TRUNC | O_CREAT, 0644));
|
|
ASSERT_SYS(0, 0, fstat(3, &st));
|
|
ASSERT_EQ(0100644, st.st_mode);
|
|
// make sure open() can't apply the setuid bit
|
|
ASSERT_SYS(EPERM, -1, open("bar", O_WRONLY | O_TRUNC | O_CREAT, 04644));
|
|
_Exit(0);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge, sigaction_isFineButForbidsSigsys) {
|
|
if (IsOpenbsd()) return; // b/c testing linux bpf
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio", 0));
|
|
struct sigaction sa = {.sa_handler = OnSig};
|
|
ASSERT_SYS(0, 0, sigaction(SIGINT, &sa, 0));
|
|
ASSERT_SYS(EPERM, -1, sigaction(SIGSYS, &sa, 0));
|
|
_Exit(0);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws) && !WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge, execpromises_ok) {
|
|
if (IsOpenbsd()) return; // b/c testing linux bpf
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio exec", "stdio"));
|
|
execl("life.elf", "life.elf", 0);
|
|
_Exit(127);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws));
|
|
EXPECT_EQ(42, WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge, execpromises_notok) {
|
|
if (IsOpenbsd()) return; // b/c testing linux bpf
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio exec", "stdio"));
|
|
execl("sock.elf", "sock.elf", 0);
|
|
_Exit(127);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws));
|
|
EXPECT_EQ(128 + EPERM, WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge, execpromises_reducesAtExecOnLinux) {
|
|
if (IsOpenbsd()) return; // b/c testing linux bpf
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio inet tty exec", "stdio tty"));
|
|
execl("sock.elf", "sock.elf", 0);
|
|
_Exit(127);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws));
|
|
EXPECT_EQ(128 + EPERM, WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge_openbsd, execpromisesIsNull_letsItDoAnything) {
|
|
if (!IsOpenbsd()) return;
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio exec", 0));
|
|
execl("sock.elf", "sock.elf", 0);
|
|
_Exit(127);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws));
|
|
EXPECT_EQ(3, WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge_openbsd, execpromisesIsSuperset_letsItDoAnything) {
|
|
if (!IsOpenbsd()) return;
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio rpath exec", "stdio rpath tty inet"));
|
|
execl("sock.elf", "sock.elf", 0);
|
|
_Exit(127);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws));
|
|
EXPECT_EQ(3, WEXITSTATUS(ws));
|
|
}
|
|
|
|
TEST(pledge_linux, execpromisesIsSuperset_notPossible) {
|
|
if (IsOpenbsd()) return;
|
|
ASSERT_SYS(EINVAL, -1, pledge("stdio exec", "stdio inet exec"));
|
|
}
|
|
|
|
TEST(pledge_openbsd, execpromises_notok) {
|
|
if (!IsOpenbsd()) return;
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio exec", "stdio"));
|
|
execl("sock.elf", "sock.elf", 0);
|
|
_Exit(127);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFSIGNALED(ws));
|
|
EXPECT_EQ(SIGABRT, WTERMSIG(ws));
|
|
}
|
|
|
|
TEST(pledge_openbsd, bigSyscalls) {
|
|
if (IsOpenbsd()) return; // testing lunix
|
|
int ws, pid;
|
|
struct stat st;
|
|
ASSERT_NE(-1, (pid = fork()));
|
|
if (!pid) {
|
|
ASSERT_SYS(0, 0, pledge("stdio", 0));
|
|
ASSERT_SYS(ENOSYS, -1, memfd_secret(0));
|
|
ASSERT_SYS(ENOSYS, -1, sys_bogus());
|
|
_Exit(0);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws));
|
|
EXPECT_EQ(0, WEXITSTATUS(ws));
|
|
}
|
|
|
|
int LockWorker(void *arg, int tid) {
|
|
flockfile(stdout);
|
|
ASSERT_EQ(gettid(), stdout->lock.lock);
|
|
funlockfile(stdout);
|
|
return 0;
|
|
}
|
|
|
|
TEST(pledge, threadWithLocks_canCodeMorph) {
|
|
struct spawn worker;
|
|
int ws, pid;
|
|
// not sure how this works on OpenBSD but it works!
|
|
if (!fork()) {
|
|
ASSERT_SYS(0, 0, pledge("stdio prot_exec", 0));
|
|
ASSERT_SYS(0, 0, _spawn(LockWorker, 0, &worker));
|
|
ASSERT_SYS(0, 0, _join(&worker));
|
|
_Exit(0);
|
|
}
|
|
EXPECT_NE(-1, wait(&ws));
|
|
EXPECT_TRUE(WIFEXITED(ws));
|
|
EXPECT_EQ(0, WEXITSTATUS(ws));
|
|
}
|
|
|
|
BENCH(pledge, bench) {
|
|
int pid;
|
|
if (!fork()) {
|
|
ASSERT_SYS(0, 0, pledge("stdio", 0));
|
|
EZBENCH2("sched_yield", donothing, sched_yield());
|
|
_Exit(0);
|
|
}
|
|
wait(0);
|
|
}
|