1// RUN: %clangxx_cfi_dso -DSHARED_LIB %s -fPIC -shared -o %t1-so.so
2// RUN: %clangxx_cfi_dso %s -o %t1
3// RUN: %expect_crash %t1 2>&1 | FileCheck --check-prefix=CFI %s
4// RUN: %expect_crash %t1 cast 2>&1 | FileCheck --check-prefix=CFI-CAST %s
5// RUN: %expect_crash %t1 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
6
7// RUN: %clangxx_cfi_dso -DB32 -DSHARED_LIB %s -fPIC -shared -o %t2-so.so
8// RUN: %clangxx_cfi_dso -DB32 %s -o %t2
9// RUN: %expect_crash %t2 2>&1 | FileCheck --check-prefix=CFI %s
10// RUN: %expect_crash %t2 cast 2>&1 | FileCheck --check-prefix=CFI-CAST %s
11// RUN: %expect_crash %t2 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
12
13// RUN: %clangxx_cfi_dso -DB64 -DSHARED_LIB %s -fPIC -shared -o %t3-so.so
14// RUN: %clangxx_cfi_dso -DB64 %s -o %t3
15// RUN: %expect_crash %t3 2>&1 | FileCheck --check-prefix=CFI %s
16// RUN: %expect_crash %t3 cast 2>&1 | FileCheck --check-prefix=CFI-CAST %s
17// RUN: %expect_crash %t3 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
18
19// RUN: %clangxx_cfi_dso -DBM -DSHARED_LIB %s -fPIC -shared -o %t4-so.so
20// RUN: %clangxx_cfi_dso -DBM %s -o %t4
21// RUN: %expect_crash %t4 2>&1 | FileCheck --check-prefix=CFI %s
22// RUN: %expect_crash %t4 cast 2>&1 | FileCheck --check-prefix=CFI-CAST %s
23// RUN: %expect_crash %t4 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
24
25// RUN: %clangxx -g -DBM -DSHARED_LIB -DNOCFI %s -fPIC -shared -o %t5-so.so
26// RUN: %clangxx -g -DBM -DNOCFI %s -ldl -o %t5
27// RUN: %t5 2>&1 | FileCheck --check-prefix=NCFI %s
28// RUN: %t5 cast 2>&1 | FileCheck --check-prefix=NCFI %s
29// RUN: %t5 dlclose 2>&1 | FileCheck --check-prefix=NCFI %s
30
31// Test that calls to uninstrumented library are unchecked.
32// RUN: %clangxx -DBM -DSHARED_LIB %s -fPIC -shared -o %t6-so.so
33// RUN: %clangxx_cfi_dso -DBM %s -o %t6
34// RUN: %t6 2>&1 | FileCheck --check-prefix=NCFI %s
35// RUN: %t6 cast 2>&1 | FileCheck --check-prefix=NCFI %s
36
37// Call-after-dlclose is checked on the caller side.
38// RUN: %expect_crash %t6 dlclose 2>&1 | FileCheck --check-prefix=CFI %s
39
40// Tests calls into dlopen-ed library.
41// REQUIRES: cxxabi
42
43#include <assert.h>
44#include <dlfcn.h>
45#include <stdio.h>
46#include <stdint.h>
47#include <string.h>
48#include <sys/mman.h>
49
50#include <string>
51
52struct A {
53 virtual void f();
54};
55
56// The page size of LoongArch is 16KiB, aligned to the memory page size.
57#ifdef __loongarch__
58# define PAGESIZE 16384
59#else
60# define PAGESIZE 4096
61#endif
62
63#ifdef SHARED_LIB
64
65#include "../../utils.h"
66struct B {
67 virtual void f();
68};
69void B::f() {}
70
71extern "C" void *create_B() {
72 create_derivers<B>();
73 return (void *)(new B());
74}
75
76extern "C" __attribute__((aligned(PAGESIZE))) void do_nothing() {}
77
78#else
79
80void A::f() {}
81
82static const int kCodeAlign = PAGESIZE;
83static const int kCodeSize = 4096;
84static char saved_code[kCodeSize];
85static char *real_start;
86
87static void save_code(char *p) {
88 real_start = (char *)(((uintptr_t)p) & ~(kCodeAlign - 1));
89 memcpy(dest: saved_code, src: real_start, n: kCodeSize);
90}
91
92static void restore_code() {
93 char *code =
94 (char *)mmap(addr: real_start, len: kCodeSize, PROT_READ | PROT_WRITE | PROT_EXEC,
95 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, fd: 0, offset: 0);
96 assert(code == real_start);
97 memcpy(dest: code, src: saved_code, n: kCodeSize);
98 __builtin___clear_cache(code, code + kCodeSize);
99}
100
101int main(int argc, char *argv[]) {
102 const bool test_cast = argc > 1 && strcmp(s1: argv[1], s2: "cast") == 0;
103 const bool test_dlclose = argc > 1 && strcmp(s1: argv[1], s2: "dlclose") == 0;
104
105 std::string name = std::string(argv[0]) + "-so.so";
106 void *handle = dlopen(file: name.c_str(), RTLD_NOW);
107 assert(handle);
108 void *(*create_B)() = (void *(*)())dlsym(handle: handle, name: "create_B");
109 assert(create_B);
110
111 void *p = create_B();
112 A *a;
113
114 // CFI: =0=
115 // CFI-CAST: =0=
116 // NCFI: =0=
117 fprintf(stderr, format: "=0=\n");
118
119 if (test_cast) {
120 // Test cast. BOOM.
121 a = (A*)p;
122 } else {
123 // Invisible to CFI. Test virtual call later.
124 memcpy(dest: &a, src: &p, n: sizeof(a));
125 }
126
127 // CFI: =1=
128 // CFI-CAST-NOT: =1=
129 // NCFI: =1=
130 fprintf(stderr, format: "=1=\n");
131
132 if (test_dlclose) {
133 // Imitate an attacker sneaking in an executable page where a dlclose()d
134 // library was loaded. This needs to pass w/o CFI, so for the testing
135 // purpose, we just copy the bytes of a "void f() {}" function back and
136 // forth.
137 void (*do_nothing)() = (void (*)())dlsym(handle: handle, name: "do_nothing");
138 assert(do_nothing);
139 save_code(p: (char *)do_nothing);
140
141 int res = dlclose(handle: handle);
142 assert(res == 0);
143
144 restore_code();
145
146 do_nothing(); // UB here
147 } else {
148 a->f(); // UB here
149 }
150
151 // CFI-NOT: =2=
152 // CFI-CAST-NOT: =2=
153 // NCFI: =2=
154 fprintf(stderr, format: "=2=\n");
155}
156#endif
157

source code of compiler-rt/test/cfi/cross-dso/icall/dlopen.cpp