1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Kernel module help for s390. 4 * 5 * S390 version 6 * Copyright IBM Corp. 2002, 2003 7 * Author(s): Arnd Bergmann (arndb@de.ibm.com) 8 * Martin Schwidefsky (schwidefsky@de.ibm.com) 9 * 10 * based on i386 version 11 * Copyright (C) 2001 Rusty Russell. 12 */ 13 #include <linux/module.h> 14 #include <linux/elf.h> 15 #include <linux/vmalloc.h> 16 #include <linux/fs.h> 17 #include <linux/ftrace.h> 18 #include <linux/string.h> 19 #include <linux/kernel.h> 20 #include <linux/kasan.h> 21 #include <linux/moduleloader.h> 22 #include <linux/bug.h> 23 #include <linux/memory.h> 24 #include <asm/alternative.h> 25 #include <asm/nospec-branch.h> 26 #include <asm/facility.h> 27 #include <asm/ftrace.lds.h> 28 #include <asm/set_memory.h> 29 #include <asm/setup.h> 30 31 #if 0 32 #define DEBUGP printk 33 #else 34 #define DEBUGP(fmt , ...) 35 #endif 36 37 #define PLT_ENTRY_SIZE 22 38 39 static unsigned long get_module_load_offset(void) 40 { 41 static DEFINE_MUTEX(module_kaslr_mutex); 42 static unsigned long module_load_offset; 43 44 if (!kaslr_enabled()) 45 return 0; 46 /* 47 * Calculate the module_load_offset the first time this code 48 * is called. Once calculated it stays the same until reboot. 49 */ 50 mutex_lock(&module_kaslr_mutex); 51 if (!module_load_offset) 52 module_load_offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE; 53 mutex_unlock(&module_kaslr_mutex); 54 return module_load_offset; 55 } 56 57 void *module_alloc(unsigned long size) 58 { 59 gfp_t gfp_mask = GFP_KERNEL; 60 void *p; 61 62 if (PAGE_ALIGN(size) > MODULES_LEN) 63 return NULL; 64 p = __vmalloc_node_range(size, MODULE_ALIGN, 65 MODULES_VADDR + get_module_load_offset(), 66 MODULES_END, gfp_mask, PAGE_KERNEL, 67 VM_FLUSH_RESET_PERMS | VM_DEFER_KMEMLEAK, 68 NUMA_NO_NODE, __builtin_return_address(0)); 69 if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) { 70 vfree(p); 71 return NULL; 72 } 73 return p; 74 } 75 76 #ifdef CONFIG_FUNCTION_TRACER 77 void module_arch_cleanup(struct module *mod) 78 { 79 module_memfree(mod->arch.trampolines_start); 80 } 81 #endif 82 83 void module_arch_freeing_init(struct module *mod) 84 { 85 if (is_livepatch_module(mod) && 86 mod->state == MODULE_STATE_LIVE) 87 return; 88 89 vfree(mod->arch.syminfo); 90 mod->arch.syminfo = NULL; 91 } 92 93 static void check_rela(Elf_Rela *rela, struct module *me) 94 { 95 struct mod_arch_syminfo *info; 96 97 info = me->arch.syminfo + ELF_R_SYM (rela->r_info); 98 switch (ELF_R_TYPE (rela->r_info)) { 99 case R_390_GOT12: /* 12 bit GOT offset. */ 100 case R_390_GOT16: /* 16 bit GOT offset. */ 101 case R_390_GOT20: /* 20 bit GOT offset. */ 102 case R_390_GOT32: /* 32 bit GOT offset. */ 103 case R_390_GOT64: /* 64 bit GOT offset. */ 104 case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ 105 case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ 106 case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ 107 case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ 108 case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ 109 case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ 110 case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ 111 if (info->got_offset == -1UL) { 112 info->got_offset = me->arch.got_size; 113 me->arch.got_size += sizeof(void*); 114 } 115 break; 116 case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 117 case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 118 case R_390_PLT32: /* 32 bit PC relative PLT address. */ 119 case R_390_PLT64: /* 64 bit PC relative PLT address. */ 120 case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 121 case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 122 case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 123 if (info->plt_offset == -1UL) { 124 info->plt_offset = me->arch.plt_size; 125 me->arch.plt_size += PLT_ENTRY_SIZE; 126 } 127 break; 128 case R_390_COPY: 129 case R_390_GLOB_DAT: 130 case R_390_JMP_SLOT: 131 case R_390_RELATIVE: 132 /* Only needed if we want to support loading of 133 modules linked with -shared. */ 134 break; 135 } 136 } 137 138 /* 139 * Account for GOT and PLT relocations. We can't add sections for 140 * got and plt but we can increase the core module size. 141 */ 142 int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, 143 char *secstrings, struct module *me) 144 { 145 Elf_Shdr *symtab; 146 Elf_Sym *symbols; 147 Elf_Rela *rela; 148 char *strings; 149 int nrela, i, j; 150 struct module_memory *mod_mem; 151 152 /* Find symbol table and string table. */ 153 symtab = NULL; 154 for (i = 0; i < hdr->e_shnum; i++) 155 switch (sechdrs[i].sh_type) { 156 case SHT_SYMTAB: 157 symtab = sechdrs + i; 158 break; 159 } 160 if (!symtab) { 161 printk(KERN_ERR "module %s: no symbol table\n", me->name); 162 return -ENOEXEC; 163 } 164 165 /* Allocate one syminfo structure per symbol. */ 166 me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym); 167 me->arch.syminfo = vmalloc(array_size(sizeof(struct mod_arch_syminfo), 168 me->arch.nsyms)); 169 if (!me->arch.syminfo) 170 return -ENOMEM; 171 symbols = (void *) hdr + symtab->sh_offset; 172 strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset; 173 for (i = 0; i < me->arch.nsyms; i++) { 174 if (symbols[i].st_shndx == SHN_UNDEF && 175 strcmp(strings + symbols[i].st_name, 176 "_GLOBAL_OFFSET_TABLE_") == 0) 177 /* "Define" it as absolute. */ 178 symbols[i].st_shndx = SHN_ABS; 179 me->arch.syminfo[i].got_offset = -1UL; 180 me->arch.syminfo[i].plt_offset = -1UL; 181 me->arch.syminfo[i].got_initialized = 0; 182 me->arch.syminfo[i].plt_initialized = 0; 183 } 184 185 /* Search for got/plt relocations. */ 186 me->arch.got_size = me->arch.plt_size = 0; 187 for (i = 0; i < hdr->e_shnum; i++) { 188 if (sechdrs[i].sh_type != SHT_RELA) 189 continue; 190 nrela = sechdrs[i].sh_size / sizeof(Elf_Rela); 191 rela = (void *) hdr + sechdrs[i].sh_offset; 192 for (j = 0; j < nrela; j++) 193 check_rela(rela + j, me); 194 } 195 196 /* Increase core size by size of got & plt and set start 197 offsets for got and plt. */ 198 mod_mem = &me->mem[MOD_TEXT]; 199 mod_mem->size = ALIGN(mod_mem->size, 4); 200 me->arch.got_offset = mod_mem->size; 201 mod_mem->size += me->arch.got_size; 202 me->arch.plt_offset = mod_mem->size; 203 if (me->arch.plt_size) { 204 if (IS_ENABLED(CONFIG_EXPOLINE) && !nospec_disable) 205 me->arch.plt_size += PLT_ENTRY_SIZE; 206 mod_mem->size += me->arch.plt_size; 207 } 208 return 0; 209 } 210 211 static int apply_rela_bits(Elf_Addr loc, Elf_Addr val, 212 int sign, int bits, int shift, 213 void *(*write)(void *dest, const void *src, size_t len)) 214 { 215 unsigned long umax; 216 long min, max; 217 void *dest = (void *)loc; 218 219 if (val & ((1UL << shift) - 1)) 220 return -ENOEXEC; 221 if (sign) { 222 val = (Elf_Addr)(((long) val) >> shift); 223 min = -(1L << (bits - 1)); 224 max = (1L << (bits - 1)) - 1; 225 if ((long) val < min || (long) val > max) 226 return -ENOEXEC; 227 } else { 228 val >>= shift; 229 umax = ((1UL << (bits - 1)) << 1) - 1; 230 if ((unsigned long) val > umax) 231 return -ENOEXEC; 232 } 233 234 if (bits == 8) { 235 unsigned char tmp = val; 236 write(dest, &tmp, 1); 237 } else if (bits == 12) { 238 unsigned short tmp = (val & 0xfff) | 239 (*(unsigned short *) loc & 0xf000); 240 write(dest, &tmp, 2); 241 } else if (bits == 16) { 242 unsigned short tmp = val; 243 write(dest, &tmp, 2); 244 } else if (bits == 20) { 245 unsigned int tmp = (val & 0xfff) << 16 | 246 (val & 0xff000) >> 4 | (*(unsigned int *) loc & 0xf00000ff); 247 write(dest, &tmp, 4); 248 } else if (bits == 32) { 249 unsigned int tmp = val; 250 write(dest, &tmp, 4); 251 } else if (bits == 64) { 252 unsigned long tmp = val; 253 write(dest, &tmp, 8); 254 } 255 return 0; 256 } 257 258 static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, 259 const char *strtab, struct module *me, 260 void *(*write)(void *dest, const void *src, size_t len)) 261 { 262 struct mod_arch_syminfo *info; 263 Elf_Addr loc, val; 264 int r_type, r_sym; 265 int rc = -ENOEXEC; 266 267 /* This is where to make the change */ 268 loc = base + rela->r_offset; 269 /* This is the symbol it is referring to. Note that all 270 undefined symbols have been resolved. */ 271 r_sym = ELF_R_SYM(rela->r_info); 272 r_type = ELF_R_TYPE(rela->r_info); 273 info = me->arch.syminfo + r_sym; 274 val = symtab[r_sym].st_value; 275 276 switch (r_type) { 277 case R_390_NONE: /* No relocation. */ 278 rc = 0; 279 break; 280 case R_390_8: /* Direct 8 bit. */ 281 case R_390_12: /* Direct 12 bit. */ 282 case R_390_16: /* Direct 16 bit. */ 283 case R_390_20: /* Direct 20 bit. */ 284 case R_390_32: /* Direct 32 bit. */ 285 case R_390_64: /* Direct 64 bit. */ 286 val += rela->r_addend; 287 if (r_type == R_390_8) 288 rc = apply_rela_bits(loc, val, 0, 8, 0, write); 289 else if (r_type == R_390_12) 290 rc = apply_rela_bits(loc, val, 0, 12, 0, write); 291 else if (r_type == R_390_16) 292 rc = apply_rela_bits(loc, val, 0, 16, 0, write); 293 else if (r_type == R_390_20) 294 rc = apply_rela_bits(loc, val, 1, 20, 0, write); 295 else if (r_type == R_390_32) 296 rc = apply_rela_bits(loc, val, 0, 32, 0, write); 297 else if (r_type == R_390_64) 298 rc = apply_rela_bits(loc, val, 0, 64, 0, write); 299 break; 300 case R_390_PC16: /* PC relative 16 bit. */ 301 case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */ 302 case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */ 303 case R_390_PC32: /* PC relative 32 bit. */ 304 case R_390_PC64: /* PC relative 64 bit. */ 305 val += rela->r_addend - loc; 306 if (r_type == R_390_PC16) 307 rc = apply_rela_bits(loc, val, 1, 16, 0, write); 308 else if (r_type == R_390_PC16DBL) 309 rc = apply_rela_bits(loc, val, 1, 16, 1, write); 310 else if (r_type == R_390_PC32DBL) 311 rc = apply_rela_bits(loc, val, 1, 32, 1, write); 312 else if (r_type == R_390_PC32) 313 rc = apply_rela_bits(loc, val, 1, 32, 0, write); 314 else if (r_type == R_390_PC64) 315 rc = apply_rela_bits(loc, val, 1, 64, 0, write); 316 break; 317 case R_390_GOT12: /* 12 bit GOT offset. */ 318 case R_390_GOT16: /* 16 bit GOT offset. */ 319 case R_390_GOT20: /* 20 bit GOT offset. */ 320 case R_390_GOT32: /* 32 bit GOT offset. */ 321 case R_390_GOT64: /* 64 bit GOT offset. */ 322 case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ 323 case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ 324 case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ 325 case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ 326 case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ 327 case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ 328 case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ 329 if (info->got_initialized == 0) { 330 Elf_Addr *gotent = me->mem[MOD_TEXT].base + 331 me->arch.got_offset + 332 info->got_offset; 333 334 write(gotent, &val, sizeof(*gotent)); 335 info->got_initialized = 1; 336 } 337 val = info->got_offset + rela->r_addend; 338 if (r_type == R_390_GOT12 || 339 r_type == R_390_GOTPLT12) 340 rc = apply_rela_bits(loc, val, 0, 12, 0, write); 341 else if (r_type == R_390_GOT16 || 342 r_type == R_390_GOTPLT16) 343 rc = apply_rela_bits(loc, val, 0, 16, 0, write); 344 else if (r_type == R_390_GOT20 || 345 r_type == R_390_GOTPLT20) 346 rc = apply_rela_bits(loc, val, 1, 20, 0, write); 347 else if (r_type == R_390_GOT32 || 348 r_type == R_390_GOTPLT32) 349 rc = apply_rela_bits(loc, val, 0, 32, 0, write); 350 else if (r_type == R_390_GOT64 || 351 r_type == R_390_GOTPLT64) 352 rc = apply_rela_bits(loc, val, 0, 64, 0, write); 353 else if (r_type == R_390_GOTENT || 354 r_type == R_390_GOTPLTENT) { 355 val += (Elf_Addr) me->mem[MOD_TEXT].base - loc; 356 rc = apply_rela_bits(loc, val, 1, 32, 1, write); 357 } 358 break; 359 case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 360 case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 361 case R_390_PLT32: /* 32 bit PC relative PLT address. */ 362 case R_390_PLT64: /* 64 bit PC relative PLT address. */ 363 case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 364 case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 365 case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 366 if (info->plt_initialized == 0) { 367 unsigned char insn[PLT_ENTRY_SIZE]; 368 char *plt_base; 369 char *ip; 370 371 plt_base = me->mem[MOD_TEXT].base + me->arch.plt_offset; 372 ip = plt_base + info->plt_offset; 373 *(int *)insn = 0x0d10e310; /* basr 1,0 */ 374 *(int *)&insn[4] = 0x100c0004; /* lg 1,12(1) */ 375 if (IS_ENABLED(CONFIG_EXPOLINE) && !nospec_disable) { 376 char *jump_r1; 377 378 jump_r1 = plt_base + me->arch.plt_size - 379 PLT_ENTRY_SIZE; 380 /* brcl 0xf,__jump_r1 */ 381 *(short *)&insn[8] = 0xc0f4; 382 *(int *)&insn[10] = (jump_r1 - (ip + 8)) / 2; 383 } else { 384 *(int *)&insn[8] = 0x07f10000; /* br %r1 */ 385 } 386 *(long *)&insn[14] = val; 387 388 write(ip, insn, sizeof(insn)); 389 info->plt_initialized = 1; 390 } 391 if (r_type == R_390_PLTOFF16 || 392 r_type == R_390_PLTOFF32 || 393 r_type == R_390_PLTOFF64) 394 val = me->arch.plt_offset - me->arch.got_offset + 395 info->plt_offset + rela->r_addend; 396 else { 397 if (!((r_type == R_390_PLT16DBL && 398 val - loc + 0xffffUL < 0x1ffffeUL) || 399 (r_type == R_390_PLT32DBL && 400 val - loc + 0xffffffffULL < 0x1fffffffeULL))) 401 val = (Elf_Addr) me->mem[MOD_TEXT].base + 402 me->arch.plt_offset + 403 info->plt_offset; 404 val += rela->r_addend - loc; 405 } 406 if (r_type == R_390_PLT16DBL) 407 rc = apply_rela_bits(loc, val, 1, 16, 1, write); 408 else if (r_type == R_390_PLTOFF16) 409 rc = apply_rela_bits(loc, val, 0, 16, 0, write); 410 else if (r_type == R_390_PLT32DBL) 411 rc = apply_rela_bits(loc, val, 1, 32, 1, write); 412 else if (r_type == R_390_PLT32 || 413 r_type == R_390_PLTOFF32) 414 rc = apply_rela_bits(loc, val, 0, 32, 0, write); 415 else if (r_type == R_390_PLT64 || 416 r_type == R_390_PLTOFF64) 417 rc = apply_rela_bits(loc, val, 0, 64, 0, write); 418 break; 419 case R_390_GOTOFF16: /* 16 bit offset to GOT. */ 420 case R_390_GOTOFF32: /* 32 bit offset to GOT. */ 421 case R_390_GOTOFF64: /* 64 bit offset to GOT. */ 422 val = val + rela->r_addend - 423 ((Elf_Addr) me->mem[MOD_TEXT].base + me->arch.got_offset); 424 if (r_type == R_390_GOTOFF16) 425 rc = apply_rela_bits(loc, val, 0, 16, 0, write); 426 else if (r_type == R_390_GOTOFF32) 427 rc = apply_rela_bits(loc, val, 0, 32, 0, write); 428 else if (r_type == R_390_GOTOFF64) 429 rc = apply_rela_bits(loc, val, 0, 64, 0, write); 430 break; 431 case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */ 432 case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */ 433 val = (Elf_Addr) me->mem[MOD_TEXT].base + me->arch.got_offset + 434 rela->r_addend - loc; 435 if (r_type == R_390_GOTPC) 436 rc = apply_rela_bits(loc, val, 1, 32, 0, write); 437 else if (r_type == R_390_GOTPCDBL) 438 rc = apply_rela_bits(loc, val, 1, 32, 1, write); 439 break; 440 case R_390_COPY: 441 case R_390_GLOB_DAT: /* Create GOT entry. */ 442 case R_390_JMP_SLOT: /* Create PLT entry. */ 443 case R_390_RELATIVE: /* Adjust by program base. */ 444 /* Only needed if we want to support loading of 445 modules linked with -shared. */ 446 return -ENOEXEC; 447 default: 448 printk(KERN_ERR "module %s: unknown relocation: %u\n", 449 me->name, r_type); 450 return -ENOEXEC; 451 } 452 if (rc) { 453 printk(KERN_ERR "module %s: relocation error for symbol %s " 454 "(r_type %i, value 0x%lx)\n", 455 me->name, strtab + symtab[r_sym].st_name, 456 r_type, (unsigned long) val); 457 return rc; 458 } 459 return 0; 460 } 461 462 static int __apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 463 unsigned int symindex, unsigned int relsec, 464 struct module *me, 465 void *(*write)(void *dest, const void *src, size_t len)) 466 { 467 Elf_Addr base; 468 Elf_Sym *symtab; 469 Elf_Rela *rela; 470 unsigned long i, n; 471 int rc; 472 473 DEBUGP("Applying relocate section %u to %u\n", 474 relsec, sechdrs[relsec].sh_info); 475 base = sechdrs[sechdrs[relsec].sh_info].sh_addr; 476 symtab = (Elf_Sym *) sechdrs[symindex].sh_addr; 477 rela = (Elf_Rela *) sechdrs[relsec].sh_addr; 478 n = sechdrs[relsec].sh_size / sizeof(Elf_Rela); 479 480 for (i = 0; i < n; i++, rela++) { 481 rc = apply_rela(rela, base, symtab, strtab, me, write); 482 if (rc) 483 return rc; 484 } 485 return 0; 486 } 487 488 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 489 unsigned int symindex, unsigned int relsec, 490 struct module *me) 491 { 492 bool early = me->state == MODULE_STATE_UNFORMED; 493 void *(*write)(void *, const void *, size_t) = memcpy; 494 495 if (!early) 496 write = s390_kernel_write; 497 498 return __apply_relocate_add(sechdrs, strtab, symindex, relsec, me, 499 write); 500 } 501 502 #ifdef CONFIG_FUNCTION_TRACER 503 static int module_alloc_ftrace_hotpatch_trampolines(struct module *me, 504 const Elf_Shdr *s) 505 { 506 char *start, *end; 507 int numpages; 508 size_t size; 509 510 size = FTRACE_HOTPATCH_TRAMPOLINES_SIZE(s->sh_size); 511 numpages = DIV_ROUND_UP(size, PAGE_SIZE); 512 start = module_alloc(numpages * PAGE_SIZE); 513 if (!start) 514 return -ENOMEM; 515 set_memory_rox((unsigned long)start, numpages); 516 end = start + size; 517 518 me->arch.trampolines_start = (struct ftrace_hotpatch_trampoline *)start; 519 me->arch.trampolines_end = (struct ftrace_hotpatch_trampoline *)end; 520 me->arch.next_trampoline = me->arch.trampolines_start; 521 522 return 0; 523 } 524 #endif /* CONFIG_FUNCTION_TRACER */ 525 526 int module_finalize(const Elf_Ehdr *hdr, 527 const Elf_Shdr *sechdrs, 528 struct module *me) 529 { 530 const Elf_Shdr *s; 531 char *secstrings, *secname; 532 void *aseg; 533 #ifdef CONFIG_FUNCTION_TRACER 534 int ret; 535 #endif 536 537 if (IS_ENABLED(CONFIG_EXPOLINE) && 538 !nospec_disable && me->arch.plt_size) { 539 unsigned int *ij; 540 541 ij = me->mem[MOD_TEXT].base + me->arch.plt_offset + 542 me->arch.plt_size - PLT_ENTRY_SIZE; 543 ij[0] = 0xc6000000; /* exrl %r0,.+10 */ 544 ij[1] = 0x0005a7f4; /* j . */ 545 ij[2] = 0x000007f1; /* br %r1 */ 546 } 547 548 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 549 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 550 aseg = (void *) s->sh_addr; 551 secname = secstrings + s->sh_name; 552 553 if (!strcmp(".altinstructions", secname)) 554 /* patch .altinstructions */ 555 apply_alternatives(aseg, aseg + s->sh_size); 556 557 if (IS_ENABLED(CONFIG_EXPOLINE) && 558 (str_has_prefix(secname, ".s390_indirect"))) 559 nospec_revert(aseg, aseg + s->sh_size); 560 561 if (IS_ENABLED(CONFIG_EXPOLINE) && 562 (str_has_prefix(secname, ".s390_return"))) 563 nospec_revert(aseg, aseg + s->sh_size); 564 565 #ifdef CONFIG_FUNCTION_TRACER 566 if (!strcmp(FTRACE_CALLSITE_SECTION, secname)) { 567 ret = module_alloc_ftrace_hotpatch_trampolines(me, s); 568 if (ret < 0) 569 return ret; 570 } 571 #endif /* CONFIG_FUNCTION_TRACER */ 572 } 573 574 return 0; 575 } 576