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150 lines
4.3 KiB
150 lines
4.3 KiB
// RUN: %clangxx_cfi_dso -DSHARED_LIB %s -fPIC -shared -o %t1-so.so
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// RUN: %clangxx_cfi_dso %s -o %t1
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// RUN: %expect_crash %t1 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %expect_crash %t1 cast 2>&1 | FileCheck --check-prefix=CFI-CAST %s
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// RUN: %expect_crash %t1 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %clangxx_cfi_dso -DB32 -DSHARED_LIB %s -fPIC -shared -o %t2-so.so
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// RUN: %clangxx_cfi_dso -DB32 %s -o %t2
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// RUN: %expect_crash %t2 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %expect_crash %t2 cast 2>&1 | FileCheck --check-prefix=CFI-CAST %s
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// RUN: %expect_crash %t2 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %clangxx_cfi_dso -DB64 -DSHARED_LIB %s -fPIC -shared -o %t3-so.so
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// RUN: %clangxx_cfi_dso -DB64 %s -o %t3
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// RUN: %expect_crash %t3 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %expect_crash %t3 cast 2>&1 | FileCheck --check-prefix=CFI-CAST %s
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// RUN: %expect_crash %t3 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %clangxx_cfi_dso -DBM -DSHARED_LIB %s -fPIC -shared -o %t4-so.so
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// RUN: %clangxx_cfi_dso -DBM %s -o %t4
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// RUN: %expect_crash %t4 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %expect_crash %t4 cast 2>&1 | FileCheck --check-prefix=CFI-CAST %s
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// RUN: %expect_crash %t4 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
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// RUN: %clangxx -g -DBM -DSHARED_LIB -DNOCFI %s -fPIC -shared -o %t5-so.so
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// RUN: %clangxx -g -DBM -DNOCFI %s -ldl -o %t5
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// RUN: %t5 2>&1 | FileCheck --check-prefix=NCFI %s
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// RUN: %t5 cast 2>&1 | FileCheck --check-prefix=NCFI %s
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// RUN: %t5 dlclose 2>&1 | FileCheck --check-prefix=NCFI %s
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// Test that calls to uninstrumented library are unchecked.
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// RUN: %clangxx -DBM -DSHARED_LIB %s -fPIC -shared -o %t6-so.so
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// RUN: %clangxx_cfi_dso -DBM %s -o %t6
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// RUN: %t6 2>&1 | FileCheck --check-prefix=NCFI %s
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// RUN: %t6 cast 2>&1 | FileCheck --check-prefix=NCFI %s
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// Call-after-dlclose is checked on the caller side.
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// RUN: %expect_crash %t6 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
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// Tests calls into dlopen-ed library.
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// REQUIRES: cxxabi
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#include <assert.h>
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <string>
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struct A {
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virtual void f();
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};
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#ifdef SHARED_LIB
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#include "../../utils.h"
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struct B {
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virtual void f();
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};
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void B::f() {}
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extern "C" void *create_B() {
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create_derivers<B>();
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return (void *)(new B());
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}
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extern "C" __attribute__((aligned(4096))) void do_nothing() {}
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#else
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void A::f() {}
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static const int kCodeAlign = 4096;
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static const int kCodeSize = 4096;
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static char saved_code[kCodeSize];
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static char *real_start;
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static void save_code(char *p) {
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real_start = (char *)(((uintptr_t)p) & ~(kCodeAlign - 1));
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memcpy(saved_code, real_start, kCodeSize);
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}
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static void restore_code() {
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char *code =
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(char *)mmap(real_start, kCodeSize, PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0);
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assert(code == real_start);
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memcpy(code, saved_code, kCodeSize);
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__builtin___clear_cache(code, code + kCodeSize);
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}
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int main(int argc, char *argv[]) {
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const bool test_cast = argc > 1 && strcmp(argv[1], "cast") == 0;
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const bool test_dlclose = argc > 1 && strcmp(argv[1], "dlclose") == 0;
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std::string name = std::string(argv[0]) + "-so.so";
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void *handle = dlopen(name.c_str(), RTLD_NOW);
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assert(handle);
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void *(*create_B)() = (void *(*)())dlsym(handle, "create_B");
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assert(create_B);
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void *p = create_B();
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A *a;
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// CFI: =0=
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// CFI-CAST: =0=
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// NCFI: =0=
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fprintf(stderr, "=0=\n");
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if (test_cast) {
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// Test cast. BOOM.
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a = (A*)p;
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} else {
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// Invisible to CFI. Test virtual call later.
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memcpy(&a, &p, sizeof(a));
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}
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// CFI: =1=
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// CFI-CAST-NOT: =1=
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// NCFI: =1=
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fprintf(stderr, "=1=\n");
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if (test_dlclose) {
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// Imitate an attacker sneaking in an executable page where a dlclose()d
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// library was loaded. This needs to pass w/o CFI, so for the testing
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// purpose, we just copy the bytes of a "void f() {}" function back and
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// forth.
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void (*do_nothing)() = (void (*)())dlsym(handle, "do_nothing");
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assert(do_nothing);
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save_code((char *)do_nothing);
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int res = dlclose(handle);
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assert(res == 0);
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restore_code();
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do_nothing(); // UB here
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} else {
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a->f(); // UB here
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}
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// CFI-NOT: =2=
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// CFI-CAST-NOT: =2=
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// NCFI: =2=
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fprintf(stderr, "=2=\n");
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}
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#endif
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