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MaxsTechReview
f27d0b006f
Wine asks for userfaultfd with the i386 syscall number on arm64, so it never gets one and falls back to mprotect and a SIGSEGV per first write, which under proot is a ptrace stop each time. libblsession hands it the real userfaultfd and, where Android refuses the PAGEMAP_SCAN ioctl, answers it from /proc/self/pagemap and UFFDIO_WRITEPROTECT.
59 lines
2.2 KiB
Python
59 lines
2.2 KiB
Python
from pathlib import Path
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import shutil
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import subprocess
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import tempfile
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import unittest
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@unittest.skipUnless(shutil.which("gcc"), "needs gcc on a Linux host")
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class VrclientLoaderTest(unittest.TestCase):
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def test_vrclient_keeps_syscall_interposition_without_changing_other_dsos(self):
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with tempfile.TemporaryDirectory() as directory:
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root = Path(directory)
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module = root / "module.c"
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module.write_text(r"""
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#include <errno.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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long syscall(long number, ...) { (void)number; errno = ENOSYS; return -1; }
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int probe(void) {
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void *head = NULL; size_t length = 0;
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return syscall(SYS_get_robust_list, 0L, &head, &length) == 0 && head && length > 0;
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}
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""")
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subprocess.run(["gcc", "-shared", "-fPIC", "-O2", str(module), "-o",
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str(root / "vrclient.so")], check=True)
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shutil.copy(root / "vrclient.so", root / "ordinary.so")
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robust = Path(__file__).resolve().parents[1] / "linuxfs/preload/robust.c"
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harness = root / "loader.c"
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harness.write_text(r"""
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#define _GNU_SOURCE
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#include <assert.h>
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#include <dlfcn.h>
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int bl_fsync_syscall(long n, const long *a, long *r) { (void)n; (void)a; (void)r; return 0; }
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int bl_writewatch_syscall(long n, const long *a, long (*real)(long, ...), long *r) { (void)n; (void)a; (void)real; (void)r; return 0; }
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#include """ + '"' + robust.as_posix() + '"' + r"""
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int main(int argc, char **argv) {
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assert(argc == 3);
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void *ordinary = dlopen(argv[1], RTLD_NOW | RTLD_DEEPBIND);
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assert(ordinary);
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int (*probe)(void) = dlsym(ordinary, "probe");
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assert(probe && probe() == 0);
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dlclose(ordinary);
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void *vr = dlopen(argv[2], RTLD_NOW | RTLD_DEEPBIND);
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assert(vr);
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probe = dlsym(vr, "probe");
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assert(probe && probe() == 1);
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dlclose(vr);
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}
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""")
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subprocess.run(["gcc", "-O2", "-rdynamic", "-pthread", str(harness),
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"-ldl", "-o", str(root / "loader")], check=True)
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subprocess.run([str(root / "loader"), str(root / "ordinary.so"),
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str(root / "vrclient.so")], check=True, timeout=10)
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if __name__ == "__main__":
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unittest.main()
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