diff options
Diffstat (limited to 'arch/s390')
-rw-r--r-- | arch/s390/kernel/module.c | 147 |
1 files changed, 88 insertions, 59 deletions
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c index ba8f19bb438b..4055f1c49814 100644 --- a/arch/s390/kernel/module.c +++ b/arch/s390/kernel/module.c @@ -19,6 +19,7 @@ #include <linux/kasan.h> #include <linux/moduleloader.h> #include <linux/bug.h> +#include <linux/memory.h> #include <asm/alternative.h> #include <asm/nospec-branch.h> #include <asm/facility.h> @@ -174,10 +175,12 @@ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, } static int apply_rela_bits(Elf_Addr loc, Elf_Addr val, - int sign, int bits, int shift) + int sign, int bits, int shift, + void *(*write)(void *dest, const void *src, size_t len)) { unsigned long umax; long min, max; + void *dest = (void *)loc; if (val & ((1UL << shift) - 1)) return -ENOEXEC; @@ -194,26 +197,33 @@ static int apply_rela_bits(Elf_Addr loc, Elf_Addr val, return -ENOEXEC; } - if (bits == 8) - *(unsigned char *) loc = val; - else if (bits == 12) - *(unsigned short *) loc = (val & 0xfff) | + if (bits == 8) { + unsigned char tmp = val; + write(dest, &tmp, 1); + } else if (bits == 12) { + unsigned short tmp = (val & 0xfff) | (*(unsigned short *) loc & 0xf000); - else if (bits == 16) - *(unsigned short *) loc = val; - else if (bits == 20) - *(unsigned int *) loc = (val & 0xfff) << 16 | - (val & 0xff000) >> 4 | - (*(unsigned int *) loc & 0xf00000ff); - else if (bits == 32) - *(unsigned int *) loc = val; - else if (bits == 64) - *(unsigned long *) loc = val; + write(dest, &tmp, 2); + } else if (bits == 16) { + unsigned short tmp = val; + write(dest, &tmp, 2); + } else if (bits == 20) { + unsigned int tmp = (val & 0xfff) << 16 | + (val & 0xff000) >> 4 | (*(unsigned int *) loc & 0xf00000ff); + write(dest, &tmp, 4); + } else if (bits == 32) { + unsigned int tmp = val; + write(dest, &tmp, 4); + } else if (bits == 64) { + unsigned long tmp = val; + write(dest, &tmp, 8); + } return 0; } static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, - const char *strtab, struct module *me) + const char *strtab, struct module *me, + void *(*write)(void *dest, const void *src, size_t len)) { struct mod_arch_syminfo *info; Elf_Addr loc, val; @@ -241,17 +251,17 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, case R_390_64: /* Direct 64 bit. */ val += rela->r_addend; if (r_type == R_390_8) - rc = apply_rela_bits(loc, val, 0, 8, 0); + rc = apply_rela_bits(loc, val, 0, 8, 0, write); else if (r_type == R_390_12) - rc = apply_rela_bits(loc, val, 0, 12, 0); + rc = apply_rela_bits(loc, val, 0, 12, 0, write); else if (r_type == R_390_16) - rc = apply_rela_bits(loc, val, 0, 16, 0); + rc = apply_rela_bits(loc, val, 0, 16, 0, write); else if (r_type == R_390_20) - rc = apply_rela_bits(loc, val, 1, 20, 0); + rc = apply_rela_bits(loc, val, 1, 20, 0, write); else if (r_type == R_390_32) - rc = apply_rela_bits(loc, val, 0, 32, 0); + rc = apply_rela_bits(loc, val, 0, 32, 0, write); else if (r_type == R_390_64) - rc = apply_rela_bits(loc, val, 0, 64, 0); + rc = apply_rela_bits(loc, val, 0, 64, 0, write); break; case R_390_PC16: /* PC relative 16 bit. */ case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */ @@ -260,15 +270,15 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, case R_390_PC64: /* PC relative 64 bit. */ val += rela->r_addend - loc; if (r_type == R_390_PC16) - rc = apply_rela_bits(loc, val, 1, 16, 0); + rc = apply_rela_bits(loc, val, 1, 16, 0, write); else if (r_type == R_390_PC16DBL) - rc = apply_rela_bits(loc, val, 1, 16, 1); + rc = apply_rela_bits(loc, val, 1, 16, 1, write); else if (r_type == R_390_PC32DBL) - rc = apply_rela_bits(loc, val, 1, 32, 1); + rc = apply_rela_bits(loc, val, 1, 32, 1, write); else if (r_type == R_390_PC32) - rc = apply_rela_bits(loc, val, 1, 32, 0); + rc = apply_rela_bits(loc, val, 1, 32, 0, write); else if (r_type == R_390_PC64) - rc = apply_rela_bits(loc, val, 1, 64, 0); + rc = apply_rela_bits(loc, val, 1, 64, 0, write); break; case R_390_GOT12: /* 12 bit GOT offset. */ case R_390_GOT16: /* 16 bit GOT offset. */ @@ -283,33 +293,33 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ if (info->got_initialized == 0) { - Elf_Addr *gotent; + Elf_Addr *gotent = me->core_layout.base + + me->arch.got_offset + + info->got_offset; - gotent = me->core_layout.base + me->arch.got_offset + - info->got_offset; - *gotent = val; + write(gotent, &val, sizeof(*gotent)); info->got_initialized = 1; } val = info->got_offset + rela->r_addend; if (r_type == R_390_GOT12 || r_type == R_390_GOTPLT12) - rc = apply_rela_bits(loc, val, 0, 12, 0); + rc = apply_rela_bits(loc, val, 0, 12, 0, write); else if (r_type == R_390_GOT16 || r_type == R_390_GOTPLT16) - rc = apply_rela_bits(loc, val, 0, 16, 0); + rc = apply_rela_bits(loc, val, 0, 16, 0, write); else if (r_type == R_390_GOT20 || r_type == R_390_GOTPLT20) - rc = apply_rela_bits(loc, val, 1, 20, 0); + rc = apply_rela_bits(loc, val, 1, 20, 0, write); else if (r_type == R_390_GOT32 || r_type == R_390_GOTPLT32) - rc = apply_rela_bits(loc, val, 0, 32, 0); + rc = apply_rela_bits(loc, val, 0, 32, 0, write); else if (r_type == R_390_GOT64 || r_type == R_390_GOTPLT64) - rc = apply_rela_bits(loc, val, 0, 64, 0); + rc = apply_rela_bits(loc, val, 0, 64, 0, write); else if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) { val += (Elf_Addr) me->core_layout.base - loc; - rc = apply_rela_bits(loc, val, 1, 32, 1); + rc = apply_rela_bits(loc, val, 1, 32, 1, write); } break; case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ @@ -320,25 +330,29 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ if (info->plt_initialized == 0) { - unsigned int *ip; - ip = me->core_layout.base + me->arch.plt_offset + - info->plt_offset; - ip[0] = 0x0d10e310; /* basr 1,0 */ - ip[1] = 0x100a0004; /* lg 1,10(1) */ + unsigned int insn[5]; + unsigned int *ip = me->core_layout.base + + me->arch.plt_offset + + info->plt_offset; + + insn[0] = 0x0d10e310; /* basr 1,0 */ + insn[1] = 0x100a0004; /* lg 1,10(1) */ if (IS_ENABLED(CONFIG_EXPOLINE) && !nospec_disable) { unsigned int *ij; ij = me->core_layout.base + me->arch.plt_offset + me->arch.plt_size - PLT_ENTRY_SIZE; - ip[2] = 0xa7f40000 + /* j __jump_r1 */ + insn[2] = 0xa7f40000 + /* j __jump_r1 */ (unsigned int)(u16) (((unsigned long) ij - 8 - (unsigned long) ip) / 2); } else { - ip[2] = 0x07f10000; /* br %r1 */ + insn[2] = 0x07f10000; /* br %r1 */ } - ip[3] = (unsigned int) (val >> 32); - ip[4] = (unsigned int) val; + insn[3] = (unsigned int) (val >> 32); + insn[4] = (unsigned int) val; + + write(ip, insn, sizeof(insn)); info->plt_initialized = 1; } if (r_type == R_390_PLTOFF16 || @@ -357,17 +371,17 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, val += rela->r_addend - loc; } if (r_type == R_390_PLT16DBL) - rc = apply_rela_bits(loc, val, 1, 16, 1); + rc = apply_rela_bits(loc, val, 1, 16, 1, write); else if (r_type == R_390_PLTOFF16) - rc = apply_rela_bits(loc, val, 0, 16, 0); + rc = apply_rela_bits(loc, val, 0, 16, 0, write); else if (r_type == R_390_PLT32DBL) - rc = apply_rela_bits(loc, val, 1, 32, 1); + rc = apply_rela_bits(loc, val, 1, 32, 1, write); else if (r_type == R_390_PLT32 || r_type == R_390_PLTOFF32) - rc = apply_rela_bits(loc, val, 0, 32, 0); + rc = apply_rela_bits(loc, val, 0, 32, 0, write); else if (r_type == R_390_PLT64 || r_type == R_390_PLTOFF64) - rc = apply_rela_bits(loc, val, 0, 64, 0); + rc = apply_rela_bits(loc, val, 0, 64, 0, write); break; case R_390_GOTOFF16: /* 16 bit offset to GOT. */ case R_390_GOTOFF32: /* 32 bit offset to GOT. */ @@ -375,20 +389,20 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, val = val + rela->r_addend - ((Elf_Addr) me->core_layout.base + me->arch.got_offset); if (r_type == R_390_GOTOFF16) - rc = apply_rela_bits(loc, val, 0, 16, 0); + rc = apply_rela_bits(loc, val, 0, 16, 0, write); else if (r_type == R_390_GOTOFF32) - rc = apply_rela_bits(loc, val, 0, 32, 0); + rc = apply_rela_bits(loc, val, 0, 32, 0, write); else if (r_type == R_390_GOTOFF64) - rc = apply_rela_bits(loc, val, 0, 64, 0); + rc = apply_rela_bits(loc, val, 0, 64, 0, write); break; case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */ case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */ val = (Elf_Addr) me->core_layout.base + me->arch.got_offset + rela->r_addend - loc; if (r_type == R_390_GOTPC) - rc = apply_rela_bits(loc, val, 1, 32, 0); + rc = apply_rela_bits(loc, val, 1, 32, 0, write); else if (r_type == R_390_GOTPCDBL) - rc = apply_rela_bits(loc, val, 1, 32, 1); + rc = apply_rela_bits(loc, val, 1, 32, 1, write); break; case R_390_COPY: case R_390_GLOB_DAT: /* Create GOT entry. */ @@ -412,9 +426,10 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, return 0; } -int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, +static int __apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, - struct module *me) + struct module *me, + void *(*write)(void *dest, const void *src, size_t len)) { Elf_Addr base; Elf_Sym *symtab; @@ -430,13 +445,27 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, n = sechdrs[relsec].sh_size / sizeof(Elf_Rela); for (i = 0; i < n; i++, rela++) { - rc = apply_rela(rela, base, symtab, strtab, me); + rc = apply_rela(rela, base, symtab, strtab, me, write); if (rc) return rc; } return 0; } +int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, + struct module *me) +{ + bool early = me->state == MODULE_STATE_UNFORMED; + void *(*write)(void *, const void *, size_t) = memcpy; + + if (!early) + write = s390_kernel_write; + + return __apply_relocate_add(sechdrs, strtab, symindex, relsec, me, + write); +} + int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *me) |