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 39static 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 57void *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 77void module_arch_cleanup(struct module *mod) 78{ 79 module_memfree(mod->arch.trampolines_start); 80} 81#endif 82 83void 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 93static 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 */ 142int 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 211static 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 258static 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 + 356 me->arch.got_offset - loc; 357 rc = apply_rela_bits(loc, val, 1, 32, 1, write); 358 } 359 break; 360 case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 361 case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 362 case R_390_PLT32: /* 32 bit PC relative PLT address. */ 363 case R_390_PLT64: /* 64 bit PC relative PLT address. */ 364 case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 365 case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 366 case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 367 if (info->plt_initialized == 0) { 368 unsigned char insn[PLT_ENTRY_SIZE]; 369 char *plt_base; 370 char *ip; 371 372 plt_base = me->mem[MOD_TEXT].base + me->arch.plt_offset; 373 ip = plt_base + info->plt_offset; 374 *(int *)insn = 0x0d10e310; /* basr 1,0 */ 375 *(int *)&insn[4] = 0x100c0004; /* lg 1,12(1) */ 376 if (IS_ENABLED(CONFIG_EXPOLINE) && !nospec_disable) { 377 char *jump_r1; 378 379 jump_r1 = plt_base + me->arch.plt_size - 380 PLT_ENTRY_SIZE; 381 /* brcl 0xf,__jump_r1 */ 382 *(short *)&insn[8] = 0xc0f4; 383 *(int *)&insn[10] = (jump_r1 - (ip + 8)) / 2; 384 } else { 385 *(int *)&insn[8] = 0x07f10000; /* br %r1 */ 386 } 387 *(long *)&insn[14] = val; 388 389 write(ip, insn, sizeof(insn)); 390 info->plt_initialized = 1; 391 } 392 if (r_type == R_390_PLTOFF16 || 393 r_type == R_390_PLTOFF32 || 394 r_type == R_390_PLTOFF64) 395 val = me->arch.plt_offset - me->arch.got_offset + 396 info->plt_offset + rela->r_addend; 397 else { 398 if (!((r_type == R_390_PLT16DBL && 399 val - loc + 0xffffUL < 0x1ffffeUL) || 400 (r_type == R_390_PLT32DBL && 401 val - loc + 0xffffffffULL < 0x1fffffffeULL))) 402 val = (Elf_Addr) me->mem[MOD_TEXT].base + 403 me->arch.plt_offset + 404 info->plt_offset; 405 val += rela->r_addend - loc; 406 } 407 if (r_type == R_390_PLT16DBL) 408 rc = apply_rela_bits(loc, val, 1, 16, 1, write); 409 else if (r_type == R_390_PLTOFF16) 410 rc = apply_rela_bits(loc, val, 0, 16, 0, write); 411 else if (r_type == R_390_PLT32DBL) 412 rc = apply_rela_bits(loc, val, 1, 32, 1, write); 413 else if (r_type == R_390_PLT32 || 414 r_type == R_390_PLTOFF32) 415 rc = apply_rela_bits(loc, val, 0, 32, 0, write); 416 else if (r_type == R_390_PLT64 || 417 r_type == R_390_PLTOFF64) 418 rc = apply_rela_bits(loc, val, 0, 64, 0, write); 419 break; 420 case R_390_GOTOFF16: /* 16 bit offset to GOT. */ 421 case R_390_GOTOFF32: /* 32 bit offset to GOT. */ 422 case R_390_GOTOFF64: /* 64 bit offset to GOT. */ 423 val = val + rela->r_addend - 424 ((Elf_Addr) me->mem[MOD_TEXT].base + me->arch.got_offset); 425 if (r_type == R_390_GOTOFF16) 426 rc = apply_rela_bits(loc, val, 0, 16, 0, write); 427 else if (r_type == R_390_GOTOFF32) 428 rc = apply_rela_bits(loc, val, 0, 32, 0, write); 429 else if (r_type == R_390_GOTOFF64) 430 rc = apply_rela_bits(loc, val, 0, 64, 0, write); 431 break; 432 case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */ 433 case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */ 434 val = (Elf_Addr) me->mem[MOD_TEXT].base + me->arch.got_offset + 435 rela->r_addend - loc; 436 if (r_type == R_390_GOTPC) 437 rc = apply_rela_bits(loc, val, 1, 32, 0, write); 438 else if (r_type == R_390_GOTPCDBL) 439 rc = apply_rela_bits(loc, val, 1, 32, 1, write); 440 break; 441 case R_390_COPY: 442 case R_390_GLOB_DAT: /* Create GOT entry. */ 443 case R_390_JMP_SLOT: /* Create PLT entry. */ 444 case R_390_RELATIVE: /* Adjust by program base. */ 445 /* Only needed if we want to support loading of 446 modules linked with -shared. */ 447 return -ENOEXEC; 448 default: 449 printk(KERN_ERR "module %s: unknown relocation: %u\n", 450 me->name, r_type); 451 return -ENOEXEC; 452 } 453 if (rc) { 454 printk(KERN_ERR "module %s: relocation error for symbol %s " 455 "(r_type %i, value 0x%lx)\n", 456 me->name, strtab + symtab[r_sym].st_name, 457 r_type, (unsigned long) val); 458 return rc; 459 } 460 return 0; 461} 462 463static int __apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 464 unsigned int symindex, unsigned int relsec, 465 struct module *me, 466 void *(*write)(void *dest, const void *src, size_t len)) 467{ 468 Elf_Addr base; 469 Elf_Sym *symtab; 470 Elf_Rela *rela; 471 unsigned long i, n; 472 int rc; 473 474 DEBUGP("Applying relocate section %u to %u\n", 475 relsec, sechdrs[relsec].sh_info); 476 base = sechdrs[sechdrs[relsec].sh_info].sh_addr; 477 symtab = (Elf_Sym *) sechdrs[symindex].sh_addr; 478 rela = (Elf_Rela *) sechdrs[relsec].sh_addr; 479 n = sechdrs[relsec].sh_size / sizeof(Elf_Rela); 480 481 for (i = 0; i < n; i++, rela++) { 482 rc = apply_rela(rela, base, symtab, strtab, me, write); 483 if (rc) 484 return rc; 485 } 486 return 0; 487} 488 489int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 490 unsigned int symindex, unsigned int relsec, 491 struct module *me) 492{ 493 bool early = me->state == MODULE_STATE_UNFORMED; 494 void *(*write)(void *, const void *, size_t) = memcpy; 495 496 if (!early) 497 write = s390_kernel_write; 498 499 return __apply_relocate_add(sechdrs, strtab, symindex, relsec, me, 500 write); 501} 502 503#ifdef CONFIG_FUNCTION_TRACER 504static int module_alloc_ftrace_hotpatch_trampolines(struct module *me, 505 const Elf_Shdr *s) 506{ 507 char *start, *end; 508 int numpages; 509 size_t size; 510 511 size = FTRACE_HOTPATCH_TRAMPOLINES_SIZE(s->sh_size); 512 numpages = DIV_ROUND_UP(size, PAGE_SIZE); 513 start = module_alloc(numpages * PAGE_SIZE); 514 if (!start) 515 return -ENOMEM; 516 set_memory_rox((unsigned long)start, numpages); 517 end = start + size; 518 519 me->arch.trampolines_start = (struct ftrace_hotpatch_trampoline *)start; 520 me->arch.trampolines_end = (struct ftrace_hotpatch_trampoline *)end; 521 me->arch.next_trampoline = me->arch.trampolines_start; 522 523 return 0; 524} 525#endif /* CONFIG_FUNCTION_TRACER */ 526 527int module_finalize(const Elf_Ehdr *hdr, 528 const Elf_Shdr *sechdrs, 529 struct module *me) 530{ 531 const Elf_Shdr *s; 532 char *secstrings, *secname; 533 void *aseg; 534#ifdef CONFIG_FUNCTION_TRACER 535 int ret; 536#endif 537 538 if (IS_ENABLED(CONFIG_EXPOLINE) && 539 !nospec_disable && me->arch.plt_size) { 540 unsigned int *ij; 541 542 ij = me->mem[MOD_TEXT].base + me->arch.plt_offset + 543 me->arch.plt_size - PLT_ENTRY_SIZE; 544 ij[0] = 0xc6000000; /* exrl %r0,.+10 */ 545 ij[1] = 0x0005a7f4; /* j . */ 546 ij[2] = 0x000007f1; /* br %r1 */ 547 } 548 549 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 550 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 551 aseg = (void *) s->sh_addr; 552 secname = secstrings + s->sh_name; 553 554 if (!strcmp(".altinstructions", secname)) 555 /* patch .altinstructions */ 556 apply_alternatives(aseg, aseg + s->sh_size); 557 558 if (IS_ENABLED(CONFIG_EXPOLINE) && 559 (str_has_prefix(secname, ".s390_indirect"))) 560 nospec_revert(aseg, aseg + s->sh_size); 561 562 if (IS_ENABLED(CONFIG_EXPOLINE) && 563 (str_has_prefix(secname, ".s390_return"))) 564 nospec_revert(aseg, aseg + s->sh_size); 565 566#ifdef CONFIG_FUNCTION_TRACER 567 if (!strcmp(FTRACE_CALLSITE_SECTION, secname)) { 568 ret = module_alloc_ftrace_hotpatch_trampolines(me, s); 569 if (ret < 0) 570 return ret; 571 } 572#endif /* CONFIG_FUNCTION_TRACER */ 573 } 574 575 return 0; 576} 577