1
2
3
4#include <fcntl.h>
5#include <sched.h>
6#include <signal.h>
7#include <stdio.h>
8#include <stdlib.h>
9#include <unistd.h>
10
11#include <linux/auxvec.h>
12#include <sys/auxv.h>
13#include <sys/mman.h>
14#include <sys/prctl.h>
15
16#include <asm/hwcap.h>
17
18#include "kselftest.h"
19#include "mte_common_util.h"
20#include "mte_def.h"
21
22#define INIT_BUFFER_SIZE 256
23
24struct mte_fault_cxt cur_mte_cxt;
25static unsigned int mte_cur_mode;
26static unsigned int mte_cur_pstate_tco;
27
28void mte_default_handler(int signum, siginfo_t *si, void *uc)
29{
30 unsigned long addr = (unsigned long)si->si_addr;
31
32 if (signum == SIGSEGV) {
33#ifdef DEBUG
34 ksft_print_msg("INFO: SIGSEGV signal at pc=%lx, fault addr=%lx, si_code=%lx\n",
35 ((ucontext_t *)uc)->uc_mcontext.pc, addr, si->si_code);
36#endif
37 if (si->si_code == SEGV_MTEAERR) {
38 if (cur_mte_cxt.trig_si_code == si->si_code)
39 cur_mte_cxt.fault_valid = true;
40 return;
41 }
42
43 else if (si->si_code == SEGV_MTESERR) {
44 if (cur_mte_cxt.trig_si_code == si->si_code &&
45 ((cur_mte_cxt.trig_range >= 0 &&
46 addr >= MT_CLEAR_TAG(cur_mte_cxt.trig_addr) &&
47 addr <= (MT_CLEAR_TAG(cur_mte_cxt.trig_addr) + cur_mte_cxt.trig_range)) ||
48 (cur_mte_cxt.trig_range < 0 &&
49 addr <= MT_CLEAR_TAG(cur_mte_cxt.trig_addr) &&
50 addr >= (MT_CLEAR_TAG(cur_mte_cxt.trig_addr) + cur_mte_cxt.trig_range)))) {
51 cur_mte_cxt.fault_valid = true;
52
53 ((ucontext_t *)uc)->uc_mcontext.pc += 4;
54 } else {
55 ksft_print_msg("Invalid MTE synchronous exception caught!\n");
56 exit(1);
57 }
58 } else {
59 ksft_print_msg("Unknown SIGSEGV exception caught!\n");
60 exit(1);
61 }
62 } else if (signum == SIGBUS) {
63 ksft_print_msg("INFO: SIGBUS signal at pc=%lx, fault addr=%lx, si_code=%lx\n",
64 ((ucontext_t *)uc)->uc_mcontext.pc, addr, si->si_code);
65 if ((cur_mte_cxt.trig_range >= 0 &&
66 addr >= MT_CLEAR_TAG(cur_mte_cxt.trig_addr) &&
67 addr <= (MT_CLEAR_TAG(cur_mte_cxt.trig_addr) + cur_mte_cxt.trig_range)) ||
68 (cur_mte_cxt.trig_range < 0 &&
69 addr <= MT_CLEAR_TAG(cur_mte_cxt.trig_addr) &&
70 addr >= (MT_CLEAR_TAG(cur_mte_cxt.trig_addr) + cur_mte_cxt.trig_range))) {
71 cur_mte_cxt.fault_valid = true;
72
73 ((ucontext_t *)uc)->uc_mcontext.pc += 4;
74 }
75 }
76}
77
78void mte_register_signal(int signal, void (*handler)(int, siginfo_t *, void *))
79{
80 struct sigaction sa;
81
82 sa.sa_sigaction = handler;
83 sa.sa_flags = SA_SIGINFO;
84 sigemptyset(&sa.sa_mask);
85 sigaction(signal, &sa, NULL);
86}
87
88void mte_wait_after_trig(void)
89{
90 sched_yield();
91}
92
93void *mte_insert_tags(void *ptr, size_t size)
94{
95 void *tag_ptr;
96 int align_size;
97
98 if (!ptr || (unsigned long)(ptr) & MT_ALIGN_GRANULE) {
99 ksft_print_msg("FAIL: Addr=%lx: invalid\n", ptr);
100 return NULL;
101 }
102 align_size = MT_ALIGN_UP(size);
103 tag_ptr = mte_insert_random_tag(ptr);
104 mte_set_tag_address_range(tag_ptr, align_size);
105 return tag_ptr;
106}
107
108void mte_clear_tags(void *ptr, size_t size)
109{
110 if (!ptr || (unsigned long)(ptr) & MT_ALIGN_GRANULE) {
111 ksft_print_msg("FAIL: Addr=%lx: invalid\n", ptr);
112 return;
113 }
114 size = MT_ALIGN_UP(size);
115 ptr = (void *)MT_CLEAR_TAG((unsigned long)ptr);
116 mte_clear_tag_address_range(ptr, size);
117}
118
119static void *__mte_allocate_memory_range(size_t size, int mem_type, int mapping,
120 size_t range_before, size_t range_after,
121 bool tags, int fd)
122{
123 void *ptr;
124 int prot_flag, map_flag;
125 size_t entire_size = size + range_before + range_after;
126
127 if (mem_type != USE_MALLOC && mem_type != USE_MMAP &&
128 mem_type != USE_MPROTECT) {
129 ksft_print_msg("FAIL: Invalid allocate request\n");
130 return NULL;
131 }
132 if (mem_type == USE_MALLOC)
133 return malloc(entire_size) + range_before;
134
135 prot_flag = PROT_READ | PROT_WRITE;
136 if (mem_type == USE_MMAP)
137 prot_flag |= PROT_MTE;
138
139 map_flag = mapping;
140 if (fd == -1)
141 map_flag = MAP_ANONYMOUS | map_flag;
142 if (!(mapping & MAP_SHARED))
143 map_flag |= MAP_PRIVATE;
144 ptr = mmap(NULL, entire_size, prot_flag, map_flag, fd, 0);
145 if (ptr == MAP_FAILED) {
146 ksft_print_msg("FAIL: mmap allocation\n");
147 return NULL;
148 }
149 if (mem_type == USE_MPROTECT) {
150 if (mprotect(ptr, entire_size, prot_flag | PROT_MTE)) {
151 munmap(ptr, size);
152 ksft_print_msg("FAIL: mprotect PROT_MTE property\n");
153 return NULL;
154 }
155 }
156 if (tags)
157 ptr = mte_insert_tags(ptr + range_before, size);
158 return ptr;
159}
160
161void *mte_allocate_memory_tag_range(size_t size, int mem_type, int mapping,
162 size_t range_before, size_t range_after)
163{
164 return __mte_allocate_memory_range(size, mem_type, mapping, range_before,
165 range_after, true, -1);
166}
167
168void *mte_allocate_memory(size_t size, int mem_type, int mapping, bool tags)
169{
170 return __mte_allocate_memory_range(size, mem_type, mapping, 0, 0, tags, -1);
171}
172
173void *mte_allocate_file_memory(size_t size, int mem_type, int mapping, bool tags, int fd)
174{
175 int index;
176 char buffer[INIT_BUFFER_SIZE];
177
178 if (mem_type != USE_MPROTECT && mem_type != USE_MMAP) {
179 ksft_print_msg("FAIL: Invalid mmap file request\n");
180 return NULL;
181 }
182
183 lseek(fd, 0, SEEK_SET);
184 for (index = INIT_BUFFER_SIZE; index < size; index += INIT_BUFFER_SIZE) {
185 if (write(fd, buffer, INIT_BUFFER_SIZE) != INIT_BUFFER_SIZE) {
186 perror("initialising buffer");
187 return NULL;
188 }
189 }
190 index -= INIT_BUFFER_SIZE;
191 if (write(fd, buffer, size - index) != size - index) {
192 perror("initialising buffer");
193 return NULL;
194 }
195 return __mte_allocate_memory_range(size, mem_type, mapping, 0, 0, tags, fd);
196}
197
198void *mte_allocate_file_memory_tag_range(size_t size, int mem_type, int mapping,
199 size_t range_before, size_t range_after, int fd)
200{
201 int index;
202 char buffer[INIT_BUFFER_SIZE];
203 int map_size = size + range_before + range_after;
204
205 if (mem_type != USE_MPROTECT && mem_type != USE_MMAP) {
206 ksft_print_msg("FAIL: Invalid mmap file request\n");
207 return NULL;
208 }
209
210 lseek(fd, 0, SEEK_SET);
211 for (index = INIT_BUFFER_SIZE; index < map_size; index += INIT_BUFFER_SIZE)
212 if (write(fd, buffer, INIT_BUFFER_SIZE) != INIT_BUFFER_SIZE) {
213 perror("initialising buffer");
214 return NULL;
215 }
216 index -= INIT_BUFFER_SIZE;
217 if (write(fd, buffer, map_size - index) != map_size - index) {
218 perror("initialising buffer");
219 return NULL;
220 }
221 return __mte_allocate_memory_range(size, mem_type, mapping, range_before,
222 range_after, true, fd);
223}
224
225static void __mte_free_memory_range(void *ptr, size_t size, int mem_type,
226 size_t range_before, size_t range_after, bool tags)
227{
228 switch (mem_type) {
229 case USE_MALLOC:
230 free(ptr - range_before);
231 break;
232 case USE_MMAP:
233 case USE_MPROTECT:
234 if (tags)
235 mte_clear_tags(ptr, size);
236 munmap(ptr - range_before, size + range_before + range_after);
237 break;
238 default:
239 ksft_print_msg("FAIL: Invalid free request\n");
240 break;
241 }
242}
243
244void mte_free_memory_tag_range(void *ptr, size_t size, int mem_type,
245 size_t range_before, size_t range_after)
246{
247 __mte_free_memory_range(ptr, size, mem_type, range_before, range_after, true);
248}
249
250void mte_free_memory(void *ptr, size_t size, int mem_type, bool tags)
251{
252 __mte_free_memory_range(ptr, size, mem_type, 0, 0, tags);
253}
254
255void mte_initialize_current_context(int mode, uintptr_t ptr, ssize_t range)
256{
257 cur_mte_cxt.fault_valid = false;
258 cur_mte_cxt.trig_addr = ptr;
259 cur_mte_cxt.trig_range = range;
260 if (mode == MTE_SYNC_ERR)
261 cur_mte_cxt.trig_si_code = SEGV_MTESERR;
262 else if (mode == MTE_ASYNC_ERR)
263 cur_mte_cxt.trig_si_code = SEGV_MTEAERR;
264 else
265 cur_mte_cxt.trig_si_code = 0;
266}
267
268int mte_switch_mode(int mte_option, unsigned long incl_mask)
269{
270 unsigned long en = 0;
271
272 if (!(mte_option == MTE_SYNC_ERR || mte_option == MTE_ASYNC_ERR ||
273 mte_option == MTE_NONE_ERR || incl_mask <= MTE_ALLOW_NON_ZERO_TAG)) {
274 ksft_print_msg("FAIL: Invalid mte config option\n");
275 return -EINVAL;
276 }
277 en = PR_TAGGED_ADDR_ENABLE;
278 if (mte_option == MTE_SYNC_ERR)
279 en |= PR_MTE_TCF_SYNC;
280 else if (mte_option == MTE_ASYNC_ERR)
281 en |= PR_MTE_TCF_ASYNC;
282 else if (mte_option == MTE_NONE_ERR)
283 en |= PR_MTE_TCF_NONE;
284
285 en |= (incl_mask << PR_MTE_TAG_SHIFT);
286
287 if (prctl(PR_SET_TAGGED_ADDR_CTRL, en, 0, 0, 0) != 0) {
288 ksft_print_msg("FAIL:prctl PR_SET_TAGGED_ADDR_CTRL for mte mode\n");
289 return -EINVAL;
290 }
291 return 0;
292}
293
294int mte_default_setup(void)
295{
296 unsigned long hwcaps2 = getauxval(AT_HWCAP2);
297 unsigned long en = 0;
298 int ret;
299
300 if (!(hwcaps2 & HWCAP2_MTE)) {
301 ksft_print_msg("FAIL: MTE features unavailable\n");
302 return KSFT_SKIP;
303 }
304
305 ret = prctl(PR_GET_TAGGED_ADDR_CTRL, en, 0, 0, 0);
306 if (ret < 0) {
307 ksft_print_msg("FAIL:prctl PR_GET_TAGGED_ADDR_CTRL with error =%d\n", ret);
308 return KSFT_FAIL;
309 }
310 if (ret & PR_MTE_TCF_SYNC)
311 mte_cur_mode = MTE_SYNC_ERR;
312 else if (ret & PR_MTE_TCF_ASYNC)
313 mte_cur_mode = MTE_ASYNC_ERR;
314 else if (ret & PR_MTE_TCF_NONE)
315 mte_cur_mode = MTE_NONE_ERR;
316
317 mte_cur_pstate_tco = mte_get_pstate_tco();
318
319 mte_disable_pstate_tco();
320 return 0;
321}
322
323void mte_restore_setup(void)
324{
325 mte_switch_mode(mte_cur_mode, MTE_ALLOW_NON_ZERO_TAG);
326 if (mte_cur_pstate_tco == MT_PSTATE_TCO_EN)
327 mte_enable_pstate_tco();
328 else if (mte_cur_pstate_tco == MT_PSTATE_TCO_DIS)
329 mte_disable_pstate_tco();
330}
331
332int create_temp_file(void)
333{
334 int fd;
335 char filename[] = "/dev/shm/tmp_XXXXXX";
336
337
338 fd = mkstemp(&filename[0]);
339 if (fd == -1) {
340 perror(filename);
341 ksft_print_msg("FAIL: Unable to open temporary file\n");
342 return 0;
343 }
344 unlink(&filename[0]);
345 return fd;
346}
347
