1 /* $NetBSD: subr_asan.c,v 1.26 2020/09/10 14:10:46 maxv Exp $ */
2
3 /*
4 * Copyright (c) 2018-2020 Maxime Villard, m00nbsd.net
5 * All rights reserved.
6 *
7 * This code is part of the KASAN subsystem of the NetBSD kernel.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #define SAN_RUNTIME
32
33 #include <sys/cdefs.h>
34 #if 0
35 __KERNEL_RCSID(0, "$NetBSD: subr_asan.c,v 1.26 2020/09/10 14:10:46 maxv Exp $");
36 #endif
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/asan.h>
41 #include <sys/kernel.h>
42 #include <sys/proc.h>
43 #include <sys/stack.h>
44 #include <sys/sysctl.h>
45
46 #include <machine/asan.h>
47 #include <machine/bus.h>
48
49 /* ASAN constants. Part of the compiler ABI. */
50 #define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE - 1)
51 #define KASAN_ALLOCA_SCALE_SIZE 32
52
53 /* ASAN ABI version. */
54 #if defined(__clang__) && (__clang_major__ - 0 >= 6)
55 #define ASAN_ABI_VERSION 8
56 #elif __GNUC_PREREQ__(7, 1) && !defined(__clang__)
57 #define ASAN_ABI_VERSION 8
58 #elif __GNUC_PREREQ__(6, 1) && !defined(__clang__)
59 #define ASAN_ABI_VERSION 6
60 #else
61 #error "Unsupported compiler version"
62 #endif
63
64 #define __RET_ADDR (unsigned long)__builtin_return_address(0)
65
66 /* Global variable descriptor. Part of the compiler ABI. */
67 struct __asan_global_source_location {
68 const char *filename;
69 int line_no;
70 int column_no;
71 };
72
73 struct __asan_global {
74 const void *beg; /* address of the global variable */
75 size_t size; /* size of the global variable */
76 size_t size_with_redzone; /* size with the redzone */
77 const void *name; /* name of the variable */
78 const void *module_name; /* name of the module where the var is declared */
79 unsigned long has_dynamic_init; /* the var has dyn initializer (c++) */
80 struct __asan_global_source_location *location;
81 #if ASAN_ABI_VERSION >= 7
82 uintptr_t odr_indicator; /* the address of the ODR indicator symbol */
83 #endif
84 };
85
86 FEATURE(kasan, "Kernel address sanitizer");
87
88 static SYSCTL_NODE(_debug, OID_AUTO, kasan, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
89 "KASAN options");
90
91 static int panic_on_violation = 1;
92 SYSCTL_INT(_debug_kasan, OID_AUTO, panic_on_violation, CTLFLAG_RDTUN,
93 &panic_on_violation, 0,
94 "Panic if an invalid access is detected");
95
96 #define kasan_enabled (!kasan_disabled)
97 static bool kasan_disabled __read_mostly = true;
98 SYSCTL_BOOL(_debug_kasan, OID_AUTO, disabled, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
99 &kasan_disabled, 0, "KASAN is disabled");
100
101 /* -------------------------------------------------------------------------- */
102
103 void
kasan_shadow_map(vm_offset_t addr,size_t size)104 kasan_shadow_map(vm_offset_t addr, size_t size)
105 {
106 size_t sz, npages, i;
107 vm_offset_t sva, eva;
108
109 KASSERT(addr % KASAN_SHADOW_SCALE == 0,
110 ("%s: invalid address %#lx", __func__, addr));
111
112 sz = roundup(size, KASAN_SHADOW_SCALE) / KASAN_SHADOW_SCALE;
113
114 sva = kasan_md_addr_to_shad(addr);
115 eva = kasan_md_addr_to_shad(addr) + sz;
116
117 sva = rounddown(sva, PAGE_SIZE);
118 eva = roundup(eva, PAGE_SIZE);
119
120 npages = (eva - sva) / PAGE_SIZE;
121
122 KASSERT(sva >= KASAN_MIN_ADDRESS && eva < KASAN_MAX_ADDRESS,
123 ("%s: invalid address range %#lx-%#lx", __func__, sva, eva));
124
125 for (i = 0; i < npages; i++)
126 pmap_san_enter(sva + ptoa(i));
127 }
128
129 void
kasan_init(void)130 kasan_init(void)
131 {
132 int disabled;
133
134 disabled = 0;
135 TUNABLE_INT_FETCH("debug.kasan.disabled", &disabled);
136 if (disabled)
137 return;
138
139 /* MD initialization. */
140 kasan_md_init();
141
142 /* Now officially enabled. */
143 kasan_disabled = false;
144 }
145
146 void
kasan_init_early(vm_offset_t stack,size_t size)147 kasan_init_early(vm_offset_t stack, size_t size)
148 {
149 kasan_md_init_early(stack, size);
150 }
151
152 static inline const char *
kasan_code_name(uint8_t code)153 kasan_code_name(uint8_t code)
154 {
155 switch (code) {
156 case KASAN_GENERIC_REDZONE:
157 return "GenericRedZone";
158 case KASAN_MALLOC_REDZONE:
159 return "MallocRedZone";
160 case KASAN_KMEM_REDZONE:
161 return "KmemRedZone";
162 case KASAN_UMA_FREED:
163 return "UMAUseAfterFree";
164 case KASAN_KSTACK_FREED:
165 return "KernelStack";
166 case KASAN_EXEC_ARGS_FREED:
167 return "ExecKVA";
168 case 1 ... 7:
169 return "RedZonePartial";
170 case KASAN_STACK_LEFT:
171 return "StackLeft";
172 case KASAN_STACK_MID:
173 return "StackMiddle";
174 case KASAN_STACK_RIGHT:
175 return "StackRight";
176 case KASAN_USE_AFTER_RET:
177 return "UseAfterRet";
178 case KASAN_USE_AFTER_SCOPE:
179 return "UseAfterScope";
180 default:
181 return "Unknown";
182 }
183 }
184
185 #define REPORT(f, ...) do { \
186 if (panic_on_violation) { \
187 kasan_disabled = true; \
188 panic(f, __VA_ARGS__); \
189 } else { \
190 struct stack st; \
191 \
192 stack_save(&st); \
193 printf(f "\n", __VA_ARGS__); \
194 stack_print_ddb(&st); \
195 } \
196 } while (0)
197
198 static void
kasan_report(unsigned long addr,size_t size,bool write,unsigned long pc,uint8_t code)199 kasan_report(unsigned long addr, size_t size, bool write, unsigned long pc,
200 uint8_t code)
201 {
202 REPORT("ASan: Invalid access, %zu-byte %s at %#lx, %s(%x)",
203 size, (write ? "write" : "read"), addr, kasan_code_name(code),
204 code);
205 }
206
207 static __always_inline void
kasan_shadow_1byte_markvalid(unsigned long addr)208 kasan_shadow_1byte_markvalid(unsigned long addr)
209 {
210 int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
211 int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
212
213 *byte = last;
214 }
215
216 static __always_inline void
kasan_shadow_Nbyte_markvalid(const void * addr,size_t size)217 kasan_shadow_Nbyte_markvalid(const void *addr, size_t size)
218 {
219 size_t i;
220
221 for (i = 0; i < size; i++) {
222 kasan_shadow_1byte_markvalid((unsigned long)addr + i);
223 }
224 }
225
226 static __always_inline void
kasan_shadow_Nbyte_fill(const void * addr,size_t size,uint8_t code)227 kasan_shadow_Nbyte_fill(const void *addr, size_t size, uint8_t code)
228 {
229 void *shad;
230
231 if (__predict_false(size == 0))
232 return;
233 if (__predict_false(kasan_md_unsupported((vm_offset_t)addr)))
234 return;
235
236 KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
237 ("%s: invalid address %p", __func__, addr));
238 KASSERT(size % KASAN_SHADOW_SCALE == 0,
239 ("%s: invalid size %zu", __func__, size));
240
241 shad = (void *)kasan_md_addr_to_shad((uintptr_t)addr);
242 size = size >> KASAN_SHADOW_SCALE_SHIFT;
243
244 __builtin_memset(shad, code, size);
245 }
246
247 /*
248 * In an area of size 'sz_with_redz', mark the 'size' first bytes as valid,
249 * and the rest as invalid. There are generally two use cases:
250 *
251 * o kasan_mark(addr, origsize, size, code), with origsize < size. This marks
252 * the redzone at the end of the buffer as invalid. If the entire is to be
253 * marked invalid, origsize will be 0.
254 *
255 * o kasan_mark(addr, size, size, 0). This marks the entire buffer as valid.
256 */
257 void
kasan_mark(const void * addr,size_t size,size_t redzsize,uint8_t code)258 kasan_mark(const void *addr, size_t size, size_t redzsize, uint8_t code)
259 {
260 size_t i, n, redz;
261 int8_t *shad;
262
263 if (__predict_false(!kasan_enabled))
264 return;
265
266 if ((vm_offset_t)addr >= DMAP_MIN_ADDRESS &&
267 (vm_offset_t)addr < DMAP_MAX_ADDRESS)
268 return;
269
270 KASSERT((vm_offset_t)addr >= VM_MIN_KERNEL_ADDRESS &&
271 (vm_offset_t)addr < VM_MAX_KERNEL_ADDRESS,
272 ("%s: invalid address %p", __func__, addr));
273 KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
274 ("%s: invalid address %p", __func__, addr));
275 redz = redzsize - roundup(size, KASAN_SHADOW_SCALE);
276 KASSERT(redz % KASAN_SHADOW_SCALE == 0,
277 ("%s: invalid size %zu", __func__, redz));
278 shad = (int8_t *)kasan_md_addr_to_shad((uintptr_t)addr);
279
280 /* Chunks of 8 bytes, valid. */
281 n = size / KASAN_SHADOW_SCALE;
282 for (i = 0; i < n; i++) {
283 *shad++ = 0;
284 }
285
286 /* Possibly one chunk, mid. */
287 if ((size & KASAN_SHADOW_MASK) != 0) {
288 *shad++ = (size & KASAN_SHADOW_MASK);
289 }
290
291 /* Chunks of 8 bytes, invalid. */
292 n = redz / KASAN_SHADOW_SCALE;
293 for (i = 0; i < n; i++) {
294 *shad++ = code;
295 }
296 }
297
298 void
kasan_thread_alloc(struct thread * td)299 kasan_thread_alloc(struct thread *td)
300 {
301 if (td->td_kstack != 0) {
302 kasan_mark((void *)td->td_kstack, ptoa(td->td_kstack_pages),
303 ptoa(td->td_kstack_pages), 0);
304 }
305 }
306
307 /* -------------------------------------------------------------------------- */
308
309 #define ADDR_CROSSES_SCALE_BOUNDARY(addr, size) \
310 (addr >> KASAN_SHADOW_SCALE_SHIFT) != \
311 ((addr + size - 1) >> KASAN_SHADOW_SCALE_SHIFT)
312
313 static __always_inline bool
kasan_shadow_1byte_isvalid(unsigned long addr,uint8_t * code)314 kasan_shadow_1byte_isvalid(unsigned long addr, uint8_t *code)
315 {
316 int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
317 int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
318
319 if (__predict_true(*byte == 0 || last <= *byte)) {
320 return (true);
321 }
322 *code = *byte;
323 return (false);
324 }
325
326 static __always_inline bool
kasan_shadow_2byte_isvalid(unsigned long addr,uint8_t * code)327 kasan_shadow_2byte_isvalid(unsigned long addr, uint8_t *code)
328 {
329 int8_t *byte, last;
330
331 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 2)) {
332 return (kasan_shadow_1byte_isvalid(addr, code) &&
333 kasan_shadow_1byte_isvalid(addr+1, code));
334 }
335
336 byte = (int8_t *)kasan_md_addr_to_shad(addr);
337 last = ((addr + 1) & KASAN_SHADOW_MASK) + 1;
338
339 if (__predict_true(*byte == 0 || last <= *byte)) {
340 return (true);
341 }
342 *code = *byte;
343 return (false);
344 }
345
346 static __always_inline bool
kasan_shadow_4byte_isvalid(unsigned long addr,uint8_t * code)347 kasan_shadow_4byte_isvalid(unsigned long addr, uint8_t *code)
348 {
349 int8_t *byte, last;
350
351 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 4)) {
352 return (kasan_shadow_2byte_isvalid(addr, code) &&
353 kasan_shadow_2byte_isvalid(addr+2, code));
354 }
355
356 byte = (int8_t *)kasan_md_addr_to_shad(addr);
357 last = ((addr + 3) & KASAN_SHADOW_MASK) + 1;
358
359 if (__predict_true(*byte == 0 || last <= *byte)) {
360 return (true);
361 }
362 *code = *byte;
363 return (false);
364 }
365
366 static __always_inline bool
kasan_shadow_8byte_isvalid(unsigned long addr,uint8_t * code)367 kasan_shadow_8byte_isvalid(unsigned long addr, uint8_t *code)
368 {
369 int8_t *byte, last;
370
371 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 8)) {
372 return (kasan_shadow_4byte_isvalid(addr, code) &&
373 kasan_shadow_4byte_isvalid(addr+4, code));
374 }
375
376 byte = (int8_t *)kasan_md_addr_to_shad(addr);
377 last = ((addr + 7) & KASAN_SHADOW_MASK) + 1;
378
379 if (__predict_true(*byte == 0 || last <= *byte)) {
380 return (true);
381 }
382 *code = *byte;
383 return (false);
384 }
385
386 static __always_inline bool
kasan_shadow_Nbyte_isvalid(unsigned long addr,size_t size,uint8_t * code)387 kasan_shadow_Nbyte_isvalid(unsigned long addr, size_t size, uint8_t *code)
388 {
389 size_t i;
390
391 for (i = 0; i < size; i++) {
392 if (!kasan_shadow_1byte_isvalid(addr+i, code))
393 return (false);
394 }
395
396 return (true);
397 }
398
399 static __always_inline void
kasan_shadow_check(unsigned long addr,size_t size,bool write,unsigned long retaddr)400 kasan_shadow_check(unsigned long addr, size_t size, bool write,
401 unsigned long retaddr)
402 {
403 uint8_t code;
404 bool valid;
405
406 if (__predict_false(!kasan_enabled))
407 return;
408 if (__predict_false(size == 0))
409 return;
410 if (__predict_false(kasan_md_unsupported(addr)))
411 return;
412 if (KERNEL_PANICKED())
413 return;
414
415 if (__builtin_constant_p(size)) {
416 switch (size) {
417 case 1:
418 valid = kasan_shadow_1byte_isvalid(addr, &code);
419 break;
420 case 2:
421 valid = kasan_shadow_2byte_isvalid(addr, &code);
422 break;
423 case 4:
424 valid = kasan_shadow_4byte_isvalid(addr, &code);
425 break;
426 case 8:
427 valid = kasan_shadow_8byte_isvalid(addr, &code);
428 break;
429 default:
430 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
431 break;
432 }
433 } else {
434 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
435 }
436
437 if (__predict_false(!valid)) {
438 kasan_report(addr, size, write, retaddr, code);
439 }
440 }
441
442 /* -------------------------------------------------------------------------- */
443
444 void *
kasan_memcpy(void * dst,const void * src,size_t len)445 kasan_memcpy(void *dst, const void *src, size_t len)
446 {
447 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
448 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
449 return (__builtin_memcpy(dst, src, len));
450 }
451
452 int
kasan_memcmp(const void * b1,const void * b2,size_t len)453 kasan_memcmp(const void *b1, const void *b2, size_t len)
454 {
455 kasan_shadow_check((unsigned long)b1, len, false, __RET_ADDR);
456 kasan_shadow_check((unsigned long)b2, len, false, __RET_ADDR);
457 return (__builtin_memcmp(b1, b2, len));
458 }
459
460 void *
kasan_memset(void * b,int c,size_t len)461 kasan_memset(void *b, int c, size_t len)
462 {
463 kasan_shadow_check((unsigned long)b, len, true, __RET_ADDR);
464 return (__builtin_memset(b, c, len));
465 }
466
467 void *
kasan_memmove(void * dst,const void * src,size_t len)468 kasan_memmove(void *dst, const void *src, size_t len)
469 {
470 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
471 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
472 return (__builtin_memmove(dst, src, len));
473 }
474
475 size_t
kasan_strlen(const char * str)476 kasan_strlen(const char *str)
477 {
478 const char *s;
479
480 s = str;
481 while (1) {
482 kasan_shadow_check((unsigned long)s, 1, false, __RET_ADDR);
483 if (*s == '\0')
484 break;
485 s++;
486 }
487
488 return (s - str);
489 }
490
491 char *
kasan_strcpy(char * dst,const char * src)492 kasan_strcpy(char *dst, const char *src)
493 {
494 char *save = dst;
495
496 while (1) {
497 kasan_shadow_check((unsigned long)src, 1, false, __RET_ADDR);
498 kasan_shadow_check((unsigned long)dst, 1, true, __RET_ADDR);
499 *dst = *src;
500 if (*src == '\0')
501 break;
502 src++, dst++;
503 }
504
505 return save;
506 }
507
508 int
kasan_strcmp(const char * s1,const char * s2)509 kasan_strcmp(const char *s1, const char *s2)
510 {
511 while (1) {
512 kasan_shadow_check((unsigned long)s1, 1, false, __RET_ADDR);
513 kasan_shadow_check((unsigned long)s2, 1, false, __RET_ADDR);
514 if (*s1 != *s2)
515 break;
516 if (*s1 == '\0')
517 return 0;
518 s1++, s2++;
519 }
520
521 return (*(const unsigned char *)s1 - *(const unsigned char *)s2);
522 }
523
524 int
kasan_copyin(const void * uaddr,void * kaddr,size_t len)525 kasan_copyin(const void *uaddr, void *kaddr, size_t len)
526 {
527 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
528 return (copyin(uaddr, kaddr, len));
529 }
530
531 int
kasan_copyinstr(const void * uaddr,void * kaddr,size_t len,size_t * done)532 kasan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done)
533 {
534 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
535 return (copyinstr(uaddr, kaddr, len, done));
536 }
537
538 int
kasan_copyout(const void * kaddr,void * uaddr,size_t len)539 kasan_copyout(const void *kaddr, void *uaddr, size_t len)
540 {
541 kasan_shadow_check((unsigned long)kaddr, len, false, __RET_ADDR);
542 return (copyout(kaddr, uaddr, len));
543 }
544
545 /* -------------------------------------------------------------------------- */
546
547 int
kasan_fubyte(volatile const void * base)548 kasan_fubyte(volatile const void *base)
549 {
550 return (fubyte(base));
551 }
552
553 int
kasan_fuword16(volatile const void * base)554 kasan_fuword16(volatile const void *base)
555 {
556 return (fuword16(base));
557 }
558
559 int
kasan_fueword(volatile const void * base,long * val)560 kasan_fueword(volatile const void *base, long *val)
561 {
562 kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
563 return (fueword(base, val));
564 }
565
566 int
kasan_fueword32(volatile const void * base,int32_t * val)567 kasan_fueword32(volatile const void *base, int32_t *val)
568 {
569 kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
570 return (fueword32(base, val));
571 }
572
573 int
kasan_fueword64(volatile const void * base,int64_t * val)574 kasan_fueword64(volatile const void *base, int64_t *val)
575 {
576 kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
577 return (fueword64(base, val));
578 }
579
580 int
kasan_subyte(volatile void * base,int byte)581 kasan_subyte(volatile void *base, int byte)
582 {
583 return (subyte(base, byte));
584 }
585
586 int
kasan_suword(volatile void * base,long word)587 kasan_suword(volatile void *base, long word)
588 {
589 return (suword(base, word));
590 }
591
592 int
kasan_suword16(volatile void * base,int word)593 kasan_suword16(volatile void *base, int word)
594 {
595 return (suword16(base, word));
596 }
597
598 int
kasan_suword32(volatile void * base,int32_t word)599 kasan_suword32(volatile void *base, int32_t word)
600 {
601 return (suword32(base, word));
602 }
603
604 int
kasan_suword64(volatile void * base,int64_t word)605 kasan_suword64(volatile void *base, int64_t word)
606 {
607 return (suword64(base, word));
608 }
609
610 int
kasan_casueword32(volatile uint32_t * base,uint32_t oldval,uint32_t * oldvalp,uint32_t newval)611 kasan_casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,
612 uint32_t newval)
613 {
614 kasan_shadow_check((unsigned long)oldvalp, sizeof(*oldvalp), true,
615 __RET_ADDR);
616 return (casueword32(base, oldval, oldvalp, newval));
617 }
618
619 int
kasan_casueword(volatile u_long * base,u_long oldval,u_long * oldvalp,u_long newval)620 kasan_casueword(volatile u_long *base, u_long oldval, u_long *oldvalp,
621 u_long newval)
622 {
623 kasan_shadow_check((unsigned long)oldvalp, sizeof(*oldvalp), true,
624 __RET_ADDR);
625 return (casueword(base, oldval, oldvalp, newval));
626 }
627
628 /* -------------------------------------------------------------------------- */
629
630 #include <machine/atomic.h>
631 #include <sys/atomic_san.h>
632
633 #define _ASAN_ATOMIC_FUNC_ADD(name, type) \
634 void kasan_atomic_add_##name(volatile type *ptr, type val) \
635 { \
636 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
637 __RET_ADDR); \
638 atomic_add_##name(ptr, val); \
639 }
640
641 #define ASAN_ATOMIC_FUNC_ADD(name, type) \
642 _ASAN_ATOMIC_FUNC_ADD(name, type) \
643 _ASAN_ATOMIC_FUNC_ADD(acq_##name, type) \
644 _ASAN_ATOMIC_FUNC_ADD(rel_##name, type)
645
646 #define _ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
647 void kasan_atomic_subtract_##name(volatile type *ptr, type val) \
648 { \
649 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
650 __RET_ADDR); \
651 atomic_subtract_##name(ptr, val); \
652 }
653
654 #define ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
655 _ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
656 _ASAN_ATOMIC_FUNC_SUBTRACT(acq_##name, type) \
657 _ASAN_ATOMIC_FUNC_SUBTRACT(rel_##name, type)
658
659 #define _ASAN_ATOMIC_FUNC_SET(name, type) \
660 void kasan_atomic_set_##name(volatile type *ptr, type val) \
661 { \
662 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
663 __RET_ADDR); \
664 atomic_set_##name(ptr, val); \
665 }
666
667 #define ASAN_ATOMIC_FUNC_SET(name, type) \
668 _ASAN_ATOMIC_FUNC_SET(name, type) \
669 _ASAN_ATOMIC_FUNC_SET(acq_##name, type) \
670 _ASAN_ATOMIC_FUNC_SET(rel_##name, type)
671
672 #define _ASAN_ATOMIC_FUNC_CLEAR(name, type) \
673 void kasan_atomic_clear_##name(volatile type *ptr, type val) \
674 { \
675 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
676 __RET_ADDR); \
677 atomic_clear_##name(ptr, val); \
678 }
679
680 #define ASAN_ATOMIC_FUNC_CLEAR(name, type) \
681 _ASAN_ATOMIC_FUNC_CLEAR(name, type) \
682 _ASAN_ATOMIC_FUNC_CLEAR(acq_##name, type) \
683 _ASAN_ATOMIC_FUNC_CLEAR(rel_##name, type)
684
685 #define ASAN_ATOMIC_FUNC_FETCHADD(name, type) \
686 type kasan_atomic_fetchadd_##name(volatile type *ptr, type val) \
687 { \
688 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
689 __RET_ADDR); \
690 return (atomic_fetchadd_##name(ptr, val)); \
691 }
692
693 #define ASAN_ATOMIC_FUNC_READANDCLEAR(name, type) \
694 type kasan_atomic_readandclear_##name(volatile type *ptr) \
695 { \
696 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
697 __RET_ADDR); \
698 return (atomic_readandclear_##name(ptr)); \
699 }
700
701 #define ASAN_ATOMIC_FUNC_TESTANDCLEAR(name, type) \
702 int kasan_atomic_testandclear_##name(volatile type *ptr, u_int v) \
703 { \
704 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
705 __RET_ADDR); \
706 return (atomic_testandclear_##name(ptr, v)); \
707 }
708
709 #define ASAN_ATOMIC_FUNC_TESTANDSET(name, type) \
710 int kasan_atomic_testandset_##name(volatile type *ptr, u_int v) \
711 { \
712 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
713 __RET_ADDR); \
714 return (atomic_testandset_##name(ptr, v)); \
715 }
716
717 #define ASAN_ATOMIC_FUNC_SWAP(name, type) \
718 type kasan_atomic_swap_##name(volatile type *ptr, type val) \
719 { \
720 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
721 __RET_ADDR); \
722 return (atomic_swap_##name(ptr, val)); \
723 }
724
725 #define _ASAN_ATOMIC_FUNC_CMPSET(name, type) \
726 int kasan_atomic_cmpset_##name(volatile type *ptr, type oval, \
727 type nval) \
728 { \
729 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
730 __RET_ADDR); \
731 return (atomic_cmpset_##name(ptr, oval, nval)); \
732 }
733
734 #define ASAN_ATOMIC_FUNC_CMPSET(name, type) \
735 _ASAN_ATOMIC_FUNC_CMPSET(name, type) \
736 _ASAN_ATOMIC_FUNC_CMPSET(acq_##name, type) \
737 _ASAN_ATOMIC_FUNC_CMPSET(rel_##name, type)
738
739 #define _ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
740 int kasan_atomic_fcmpset_##name(volatile type *ptr, type *oval, \
741 type nval) \
742 { \
743 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
744 __RET_ADDR); \
745 return (atomic_fcmpset_##name(ptr, oval, nval)); \
746 }
747
748 #define ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
749 _ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
750 _ASAN_ATOMIC_FUNC_FCMPSET(acq_##name, type) \
751 _ASAN_ATOMIC_FUNC_FCMPSET(rel_##name, type)
752
753 #define ASAN_ATOMIC_FUNC_THREAD_FENCE(name) \
754 void kasan_atomic_thread_fence_##name(void) \
755 { \
756 atomic_thread_fence_##name(); \
757 }
758
759 #define _ASAN_ATOMIC_FUNC_LOAD(name, type) \
760 type kasan_atomic_load_##name(volatile type *ptr) \
761 { \
762 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
763 __RET_ADDR); \
764 return (atomic_load_##name(ptr)); \
765 }
766
767 #define ASAN_ATOMIC_FUNC_LOAD(name, type) \
768 _ASAN_ATOMIC_FUNC_LOAD(name, type) \
769 _ASAN_ATOMIC_FUNC_LOAD(acq_##name, type)
770
771 #define _ASAN_ATOMIC_FUNC_STORE(name, type) \
772 void kasan_atomic_store_##name(volatile type *ptr, type val) \
773 { \
774 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
775 __RET_ADDR); \
776 atomic_store_##name(ptr, val); \
777 }
778
779 #define ASAN_ATOMIC_FUNC_STORE(name, type) \
780 _ASAN_ATOMIC_FUNC_STORE(name, type) \
781 _ASAN_ATOMIC_FUNC_STORE(rel_##name, type)
782
783 ASAN_ATOMIC_FUNC_ADD(8, uint8_t);
784 ASAN_ATOMIC_FUNC_ADD(16, uint16_t);
785 ASAN_ATOMIC_FUNC_ADD(32, uint32_t);
786 ASAN_ATOMIC_FUNC_ADD(64, uint64_t);
787 ASAN_ATOMIC_FUNC_ADD(int, u_int);
788 ASAN_ATOMIC_FUNC_ADD(long, u_long);
789 ASAN_ATOMIC_FUNC_ADD(ptr, uintptr_t);
790
791 ASAN_ATOMIC_FUNC_SUBTRACT(8, uint8_t);
792 ASAN_ATOMIC_FUNC_SUBTRACT(16, uint16_t);
793 ASAN_ATOMIC_FUNC_SUBTRACT(32, uint32_t);
794 ASAN_ATOMIC_FUNC_SUBTRACT(64, uint64_t);
795 ASAN_ATOMIC_FUNC_SUBTRACT(int, u_int);
796 ASAN_ATOMIC_FUNC_SUBTRACT(long, u_long);
797 ASAN_ATOMIC_FUNC_SUBTRACT(ptr, uintptr_t);
798
799 ASAN_ATOMIC_FUNC_SET(8, uint8_t);
800 ASAN_ATOMIC_FUNC_SET(16, uint16_t);
801 ASAN_ATOMIC_FUNC_SET(32, uint32_t);
802 ASAN_ATOMIC_FUNC_SET(64, uint64_t);
803 ASAN_ATOMIC_FUNC_SET(int, u_int);
804 ASAN_ATOMIC_FUNC_SET(long, u_long);
805 ASAN_ATOMIC_FUNC_SET(ptr, uintptr_t);
806
807 ASAN_ATOMIC_FUNC_CLEAR(8, uint8_t);
808 ASAN_ATOMIC_FUNC_CLEAR(16, uint16_t);
809 ASAN_ATOMIC_FUNC_CLEAR(32, uint32_t);
810 ASAN_ATOMIC_FUNC_CLEAR(64, uint64_t);
811 ASAN_ATOMIC_FUNC_CLEAR(int, u_int);
812 ASAN_ATOMIC_FUNC_CLEAR(long, u_long);
813 ASAN_ATOMIC_FUNC_CLEAR(ptr, uintptr_t);
814
815 ASAN_ATOMIC_FUNC_FETCHADD(32, uint32_t);
816 ASAN_ATOMIC_FUNC_FETCHADD(64, uint64_t);
817 ASAN_ATOMIC_FUNC_FETCHADD(int, u_int);
818 ASAN_ATOMIC_FUNC_FETCHADD(long, u_long);
819
820 ASAN_ATOMIC_FUNC_READANDCLEAR(32, uint32_t);
821 ASAN_ATOMIC_FUNC_READANDCLEAR(64, uint64_t);
822 ASAN_ATOMIC_FUNC_READANDCLEAR(int, u_int);
823 ASAN_ATOMIC_FUNC_READANDCLEAR(long, u_long);
824 ASAN_ATOMIC_FUNC_READANDCLEAR(ptr, uintptr_t);
825
826 ASAN_ATOMIC_FUNC_TESTANDCLEAR(32, uint32_t);
827 ASAN_ATOMIC_FUNC_TESTANDCLEAR(64, uint64_t);
828 ASAN_ATOMIC_FUNC_TESTANDCLEAR(int, u_int);
829 ASAN_ATOMIC_FUNC_TESTANDCLEAR(long, u_long);
830 ASAN_ATOMIC_FUNC_TESTANDCLEAR(ptr, uintptr_t);
831
832 ASAN_ATOMIC_FUNC_TESTANDSET(32, uint32_t);
833 ASAN_ATOMIC_FUNC_TESTANDSET(64, uint64_t);
834 ASAN_ATOMIC_FUNC_TESTANDSET(int, u_int);
835 ASAN_ATOMIC_FUNC_TESTANDSET(long, u_long);
836 ASAN_ATOMIC_FUNC_TESTANDSET(ptr, uintptr_t);
837
838 ASAN_ATOMIC_FUNC_SWAP(32, uint32_t);
839 ASAN_ATOMIC_FUNC_SWAP(64, uint64_t);
840 ASAN_ATOMIC_FUNC_SWAP(int, u_int);
841 ASAN_ATOMIC_FUNC_SWAP(long, u_long);
842 ASAN_ATOMIC_FUNC_SWAP(ptr, uintptr_t);
843
844 ASAN_ATOMIC_FUNC_CMPSET(8, uint8_t);
845 ASAN_ATOMIC_FUNC_CMPSET(16, uint16_t);
846 ASAN_ATOMIC_FUNC_CMPSET(32, uint32_t);
847 ASAN_ATOMIC_FUNC_CMPSET(64, uint64_t);
848 ASAN_ATOMIC_FUNC_CMPSET(int, u_int);
849 ASAN_ATOMIC_FUNC_CMPSET(long, u_long);
850 ASAN_ATOMIC_FUNC_CMPSET(ptr, uintptr_t);
851
852 ASAN_ATOMIC_FUNC_FCMPSET(8, uint8_t);
853 ASAN_ATOMIC_FUNC_FCMPSET(16, uint16_t);
854 ASAN_ATOMIC_FUNC_FCMPSET(32, uint32_t);
855 ASAN_ATOMIC_FUNC_FCMPSET(64, uint64_t);
856 ASAN_ATOMIC_FUNC_FCMPSET(int, u_int);
857 ASAN_ATOMIC_FUNC_FCMPSET(long, u_long);
858 ASAN_ATOMIC_FUNC_FCMPSET(ptr, uintptr_t);
859
860 _ASAN_ATOMIC_FUNC_LOAD(bool, bool);
861 ASAN_ATOMIC_FUNC_LOAD(8, uint8_t);
862 ASAN_ATOMIC_FUNC_LOAD(16, uint16_t);
863 ASAN_ATOMIC_FUNC_LOAD(32, uint32_t);
864 ASAN_ATOMIC_FUNC_LOAD(64, uint64_t);
865 ASAN_ATOMIC_FUNC_LOAD(char, u_char);
866 ASAN_ATOMIC_FUNC_LOAD(short, u_short);
867 ASAN_ATOMIC_FUNC_LOAD(int, u_int);
868 ASAN_ATOMIC_FUNC_LOAD(long, u_long);
869 ASAN_ATOMIC_FUNC_LOAD(ptr, uintptr_t);
870
871 _ASAN_ATOMIC_FUNC_STORE(bool, bool);
872 ASAN_ATOMIC_FUNC_STORE(8, uint8_t);
873 ASAN_ATOMIC_FUNC_STORE(16, uint16_t);
874 ASAN_ATOMIC_FUNC_STORE(32, uint32_t);
875 ASAN_ATOMIC_FUNC_STORE(64, uint64_t);
876 ASAN_ATOMIC_FUNC_STORE(char, u_char);
877 ASAN_ATOMIC_FUNC_STORE(short, u_short);
878 ASAN_ATOMIC_FUNC_STORE(int, u_int);
879 ASAN_ATOMIC_FUNC_STORE(long, u_long);
880 ASAN_ATOMIC_FUNC_STORE(ptr, uintptr_t);
881
882 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq);
883 ASAN_ATOMIC_FUNC_THREAD_FENCE(rel);
884 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq_rel);
885 ASAN_ATOMIC_FUNC_THREAD_FENCE(seq_cst);
886
887 void
kasan_atomic_interrupt_fence(void)888 kasan_atomic_interrupt_fence(void)
889 {
890 }
891
892 /* -------------------------------------------------------------------------- */
893
894 #include <sys/bus.h>
895 #include <machine/bus.h>
896 #include <sys/bus_san.h>
897
898 int
kasan_bus_space_map(bus_space_tag_t tag,bus_addr_t hnd,bus_size_t size,int flags,bus_space_handle_t * handlep)899 kasan_bus_space_map(bus_space_tag_t tag, bus_addr_t hnd, bus_size_t size,
900 int flags, bus_space_handle_t *handlep)
901 {
902 return (bus_space_map(tag, hnd, size, flags, handlep));
903 }
904
905 void
kasan_bus_space_unmap(bus_space_tag_t tag,bus_space_handle_t hnd,bus_size_t size)906 kasan_bus_space_unmap(bus_space_tag_t tag, bus_space_handle_t hnd,
907 bus_size_t size)
908 {
909 bus_space_unmap(tag, hnd, size);
910 }
911
912 int
kasan_bus_space_subregion(bus_space_tag_t tag,bus_space_handle_t hnd,bus_size_t offset,bus_size_t size,bus_space_handle_t * handlep)913 kasan_bus_space_subregion(bus_space_tag_t tag, bus_space_handle_t hnd,
914 bus_size_t offset, bus_size_t size, bus_space_handle_t *handlep)
915 {
916 return (bus_space_subregion(tag, hnd, offset, size, handlep));
917 }
918
919 void
kasan_bus_space_free(bus_space_tag_t tag,bus_space_handle_t hnd,bus_size_t size)920 kasan_bus_space_free(bus_space_tag_t tag, bus_space_handle_t hnd,
921 bus_size_t size)
922 {
923 bus_space_free(tag, hnd, size);
924 }
925
926 void
kasan_bus_space_barrier(bus_space_tag_t tag,bus_space_handle_t hnd,bus_size_t offset,bus_size_t size,int flags)927 kasan_bus_space_barrier(bus_space_tag_t tag, bus_space_handle_t hnd,
928 bus_size_t offset, bus_size_t size, int flags)
929 {
930 bus_space_barrier(tag, hnd, offset, size, flags);
931 }
932
933 #define ASAN_BUS_READ_FUNC(func, width, type) \
934 type kasan_bus_space_read##func##_##width(bus_space_tag_t tag, \
935 bus_space_handle_t hnd, bus_size_t offset) \
936 { \
937 return (bus_space_read##func##_##width(tag, hnd, \
938 offset)); \
939 } \
940
941 #define ASAN_BUS_READ_PTR_FUNC(func, width, type) \
942 void kasan_bus_space_read_##func##_##width(bus_space_tag_t tag, \
943 bus_space_handle_t hnd, bus_size_t size, type *buf, \
944 bus_size_t count) \
945 { \
946 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
947 false, __RET_ADDR); \
948 bus_space_read_##func##_##width(tag, hnd, size, buf, \
949 count); \
950 }
951
952 ASAN_BUS_READ_FUNC(, 1, uint8_t)
953 ASAN_BUS_READ_FUNC(_stream, 1, uint8_t)
954 ASAN_BUS_READ_PTR_FUNC(multi, 1, uint8_t)
955 ASAN_BUS_READ_PTR_FUNC(multi_stream, 1, uint8_t)
956 ASAN_BUS_READ_PTR_FUNC(region, 1, uint8_t)
957 ASAN_BUS_READ_PTR_FUNC(region_stream, 1, uint8_t)
958
959 ASAN_BUS_READ_FUNC(, 2, uint16_t)
960 ASAN_BUS_READ_FUNC(_stream, 2, uint16_t)
961 ASAN_BUS_READ_PTR_FUNC(multi, 2, uint16_t)
962 ASAN_BUS_READ_PTR_FUNC(multi_stream, 2, uint16_t)
963 ASAN_BUS_READ_PTR_FUNC(region, 2, uint16_t)
964 ASAN_BUS_READ_PTR_FUNC(region_stream, 2, uint16_t)
965
966 ASAN_BUS_READ_FUNC(, 4, uint32_t)
967 ASAN_BUS_READ_FUNC(_stream, 4, uint32_t)
968 ASAN_BUS_READ_PTR_FUNC(multi, 4, uint32_t)
969 ASAN_BUS_READ_PTR_FUNC(multi_stream, 4, uint32_t)
970 ASAN_BUS_READ_PTR_FUNC(region, 4, uint32_t)
971 ASAN_BUS_READ_PTR_FUNC(region_stream, 4, uint32_t)
972
973 ASAN_BUS_READ_FUNC(, 8, uint64_t)
974 #if defined(__aarch64__)
975 ASAN_BUS_READ_FUNC(_stream, 8, uint64_t)
976 ASAN_BUS_READ_PTR_FUNC(multi, 8, uint64_t)
977 ASAN_BUS_READ_PTR_FUNC(multi_stream, 8, uint64_t)
978 ASAN_BUS_READ_PTR_FUNC(region, 8, uint64_t)
979 ASAN_BUS_READ_PTR_FUNC(region_stream, 8, uint64_t)
980 #endif
981
982 #define ASAN_BUS_WRITE_FUNC(func, width, type) \
983 void kasan_bus_space_write##func##_##width(bus_space_tag_t tag, \
984 bus_space_handle_t hnd, bus_size_t offset, type value) \
985 { \
986 bus_space_write##func##_##width(tag, hnd, offset, value);\
987 } \
988
989 #define ASAN_BUS_WRITE_PTR_FUNC(func, width, type) \
990 void kasan_bus_space_write_##func##_##width(bus_space_tag_t tag,\
991 bus_space_handle_t hnd, bus_size_t size, const type *buf, \
992 bus_size_t count) \
993 { \
994 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
995 true, __RET_ADDR); \
996 bus_space_write_##func##_##width(tag, hnd, size, buf, \
997 count); \
998 }
999
1000 ASAN_BUS_WRITE_FUNC(, 1, uint8_t)
1001 ASAN_BUS_WRITE_FUNC(_stream, 1, uint8_t)
1002 ASAN_BUS_WRITE_PTR_FUNC(multi, 1, uint8_t)
1003 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 1, uint8_t)
1004 ASAN_BUS_WRITE_PTR_FUNC(region, 1, uint8_t)
1005 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 1, uint8_t)
1006
1007 ASAN_BUS_WRITE_FUNC(, 2, uint16_t)
1008 ASAN_BUS_WRITE_FUNC(_stream, 2, uint16_t)
1009 ASAN_BUS_WRITE_PTR_FUNC(multi, 2, uint16_t)
1010 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 2, uint16_t)
1011 ASAN_BUS_WRITE_PTR_FUNC(region, 2, uint16_t)
1012 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 2, uint16_t)
1013
1014 ASAN_BUS_WRITE_FUNC(, 4, uint32_t)
1015 ASAN_BUS_WRITE_FUNC(_stream, 4, uint32_t)
1016 ASAN_BUS_WRITE_PTR_FUNC(multi, 4, uint32_t)
1017 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 4, uint32_t)
1018 ASAN_BUS_WRITE_PTR_FUNC(region, 4, uint32_t)
1019 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 4, uint32_t)
1020
1021 ASAN_BUS_WRITE_FUNC(, 8, uint64_t)
1022
1023 #define ASAN_BUS_SET_FUNC(func, width, type) \
1024 void kasan_bus_space_set_##func##_##width(bus_space_tag_t tag, \
1025 bus_space_handle_t hnd, bus_size_t offset, type value, \
1026 bus_size_t count) \
1027 { \
1028 bus_space_set_##func##_##width(tag, hnd, offset, value, \
1029 count); \
1030 }
1031
1032 ASAN_BUS_SET_FUNC(multi, 1, uint8_t)
1033 ASAN_BUS_SET_FUNC(region, 1, uint8_t)
1034 ASAN_BUS_SET_FUNC(multi_stream, 1, uint8_t)
1035 ASAN_BUS_SET_FUNC(region_stream, 1, uint8_t)
1036
1037 ASAN_BUS_SET_FUNC(multi, 2, uint16_t)
1038 ASAN_BUS_SET_FUNC(region, 2, uint16_t)
1039 ASAN_BUS_SET_FUNC(multi_stream, 2, uint16_t)
1040 ASAN_BUS_SET_FUNC(region_stream, 2, uint16_t)
1041
1042 ASAN_BUS_SET_FUNC(multi, 4, uint32_t)
1043 ASAN_BUS_SET_FUNC(region, 4, uint32_t)
1044 ASAN_BUS_SET_FUNC(multi_stream, 4, uint32_t)
1045 ASAN_BUS_SET_FUNC(region_stream, 4, uint32_t)
1046
1047 #define ASAN_BUS_PEEK_FUNC(width, type) \
1048 int kasan_bus_space_peek_##width(bus_space_tag_t tag, \
1049 bus_space_handle_t hnd, bus_size_t offset, type *valuep) \
1050 { \
1051 return (bus_space_peek_##width(tag, hnd, offset, \
1052 valuep)); \
1053 }
1054
1055 ASAN_BUS_PEEK_FUNC(1, uint8_t)
1056 ASAN_BUS_PEEK_FUNC(2, uint16_t)
1057 ASAN_BUS_PEEK_FUNC(4, uint32_t)
1058 ASAN_BUS_PEEK_FUNC(8, uint64_t)
1059
1060 #define ASAN_BUS_POKE_FUNC(width, type) \
1061 int kasan_bus_space_poke_##width(bus_space_tag_t tag, \
1062 bus_space_handle_t hnd, bus_size_t offset, type value) \
1063 { \
1064 return (bus_space_poke_##width(tag, hnd, offset, \
1065 value)); \
1066 }
1067
1068 ASAN_BUS_POKE_FUNC(1, uint8_t)
1069 ASAN_BUS_POKE_FUNC(2, uint16_t)
1070 ASAN_BUS_POKE_FUNC(4, uint32_t)
1071 ASAN_BUS_POKE_FUNC(8, uint64_t)
1072
1073 /* -------------------------------------------------------------------------- */
1074
1075 void __asan_register_globals(struct __asan_global *, size_t);
1076 void __asan_unregister_globals(struct __asan_global *, size_t);
1077
1078 void
__asan_register_globals(struct __asan_global * globals,size_t n)1079 __asan_register_globals(struct __asan_global *globals, size_t n)
1080 {
1081 size_t i;
1082
1083 for (i = 0; i < n; i++) {
1084 kasan_mark(globals[i].beg, globals[i].size,
1085 globals[i].size_with_redzone, KASAN_GENERIC_REDZONE);
1086 }
1087 }
1088
1089 void
__asan_unregister_globals(struct __asan_global * globals,size_t n)1090 __asan_unregister_globals(struct __asan_global *globals, size_t n)
1091 {
1092 size_t i;
1093
1094 for (i = 0; i < n; i++) {
1095 kasan_mark(globals[i].beg, globals[i].size_with_redzone,
1096 globals[i].size_with_redzone, 0);
1097 }
1098 }
1099
1100 #define ASAN_LOAD_STORE(size) \
1101 void __asan_load##size(unsigned long); \
1102 void __asan_load##size(unsigned long addr) \
1103 { \
1104 kasan_shadow_check(addr, size, false, __RET_ADDR);\
1105 } \
1106 void __asan_load##size##_noabort(unsigned long); \
1107 void __asan_load##size##_noabort(unsigned long addr) \
1108 { \
1109 kasan_shadow_check(addr, size, false, __RET_ADDR);\
1110 } \
1111 void __asan_store##size(unsigned long); \
1112 void __asan_store##size(unsigned long addr) \
1113 { \
1114 kasan_shadow_check(addr, size, true, __RET_ADDR);\
1115 } \
1116 void __asan_store##size##_noabort(unsigned long); \
1117 void __asan_store##size##_noabort(unsigned long addr) \
1118 { \
1119 kasan_shadow_check(addr, size, true, __RET_ADDR);\
1120 }
1121
1122 ASAN_LOAD_STORE(1);
1123 ASAN_LOAD_STORE(2);
1124 ASAN_LOAD_STORE(4);
1125 ASAN_LOAD_STORE(8);
1126 ASAN_LOAD_STORE(16);
1127
1128 void __asan_loadN(unsigned long, size_t);
1129 void __asan_loadN_noabort(unsigned long, size_t);
1130 void __asan_storeN(unsigned long, size_t);
1131 void __asan_storeN_noabort(unsigned long, size_t);
1132 void __asan_handle_no_return(void);
1133
1134 void
__asan_loadN(unsigned long addr,size_t size)1135 __asan_loadN(unsigned long addr, size_t size)
1136 {
1137 kasan_shadow_check(addr, size, false, __RET_ADDR);
1138 }
1139
1140 void
__asan_loadN_noabort(unsigned long addr,size_t size)1141 __asan_loadN_noabort(unsigned long addr, size_t size)
1142 {
1143 kasan_shadow_check(addr, size, false, __RET_ADDR);
1144 }
1145
1146 void
__asan_storeN(unsigned long addr,size_t size)1147 __asan_storeN(unsigned long addr, size_t size)
1148 {
1149 kasan_shadow_check(addr, size, true, __RET_ADDR);
1150 }
1151
1152 void
__asan_storeN_noabort(unsigned long addr,size_t size)1153 __asan_storeN_noabort(unsigned long addr, size_t size)
1154 {
1155 kasan_shadow_check(addr, size, true, __RET_ADDR);
1156 }
1157
1158 void
__asan_handle_no_return(void)1159 __asan_handle_no_return(void)
1160 {
1161 /* nothing */
1162 }
1163
1164 #define ASAN_SET_SHADOW(byte) \
1165 void __asan_set_shadow_##byte(void *, size_t); \
1166 void __asan_set_shadow_##byte(void *addr, size_t size) \
1167 { \
1168 __builtin_memset((void *)addr, 0x##byte, size); \
1169 }
1170
1171 ASAN_SET_SHADOW(00);
1172 ASAN_SET_SHADOW(f1);
1173 ASAN_SET_SHADOW(f2);
1174 ASAN_SET_SHADOW(f3);
1175 ASAN_SET_SHADOW(f5);
1176 ASAN_SET_SHADOW(f8);
1177
1178 void __asan_poison_stack_memory(const void *, size_t);
1179 void __asan_unpoison_stack_memory(const void *, size_t);
1180
1181 void
__asan_poison_stack_memory(const void * addr,size_t size)1182 __asan_poison_stack_memory(const void *addr, size_t size)
1183 {
1184 size = roundup(size, KASAN_SHADOW_SCALE);
1185 kasan_shadow_Nbyte_fill(addr, size, KASAN_USE_AFTER_SCOPE);
1186 }
1187
1188 void
__asan_unpoison_stack_memory(const void * addr,size_t size)1189 __asan_unpoison_stack_memory(const void *addr, size_t size)
1190 {
1191 kasan_shadow_Nbyte_markvalid(addr, size);
1192 }
1193
1194 void __asan_alloca_poison(const void *, size_t);
1195 void __asan_allocas_unpoison(const void *, const void *);
1196
1197 void
__asan_alloca_poison(const void * addr,size_t size)1198 __asan_alloca_poison(const void *addr, size_t size)
1199 {
1200 const void *l, *r;
1201
1202 KASSERT((vm_offset_t)addr % KASAN_ALLOCA_SCALE_SIZE == 0,
1203 ("%s: invalid address %p", __func__, addr));
1204
1205 l = (const uint8_t *)addr - KASAN_ALLOCA_SCALE_SIZE;
1206 r = (const uint8_t *)addr + roundup(size, KASAN_ALLOCA_SCALE_SIZE);
1207
1208 kasan_shadow_Nbyte_fill(l, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_LEFT);
1209 kasan_mark(addr, size, roundup(size, KASAN_ALLOCA_SCALE_SIZE),
1210 KASAN_STACK_MID);
1211 kasan_shadow_Nbyte_fill(r, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_RIGHT);
1212 }
1213
1214 void
__asan_allocas_unpoison(const void * stkbegin,const void * stkend)1215 __asan_allocas_unpoison(const void *stkbegin, const void *stkend)
1216 {
1217 size_t size;
1218
1219 if (__predict_false(!stkbegin))
1220 return;
1221 if (__predict_false((uintptr_t)stkbegin > (uintptr_t)stkend))
1222 return;
1223 size = (uintptr_t)stkend - (uintptr_t)stkbegin;
1224
1225 kasan_shadow_Nbyte_fill(stkbegin, size, 0);
1226 }
1227
1228 void __asan_poison_memory_region(const void *addr, size_t size);
1229 void __asan_unpoison_memory_region(const void *addr, size_t size);
1230
1231 void
__asan_poison_memory_region(const void * addr,size_t size)1232 __asan_poison_memory_region(const void *addr, size_t size)
1233 {
1234 }
1235
1236 void
__asan_unpoison_memory_region(const void * addr,size_t size)1237 __asan_unpoison_memory_region(const void *addr, size_t size)
1238 {
1239 }
1240