diff options
Diffstat (limited to 'arch/arm64/kernel/module.c')
| -rw-r--r-- | arch/arm64/kernel/module.c | 44 |
1 files changed, 37 insertions, 7 deletions
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c index f469e0435903..719fde8dcc19 100644 --- a/arch/arm64/kernel/module.c +++ b/arch/arm64/kernel/module.c @@ -55,9 +55,10 @@ void *module_alloc(unsigned long size) * less likely that the module region gets exhausted, so we * can simply omit this fallback in that case. */ - p = __vmalloc_node_range(size, MODULE_ALIGN, VMALLOC_START, - VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_EXEC, 0, - NUMA_NO_NODE, __builtin_return_address(0)); + p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base, + module_alloc_base + SZ_4G, GFP_KERNEL, + PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE, + __builtin_return_address(0)); if (p && (kasan_module_alloc(p, size) < 0)) { vfree(p); @@ -197,6 +198,34 @@ static int reloc_insn_imm(enum aarch64_reloc_op op, __le32 *place, u64 val, return 0; } +static int reloc_insn_adrp(struct module *mod, __le32 *place, u64 val) +{ + u32 insn; + + if (!IS_ENABLED(CONFIG_ARM64_ERRATUM_843419) || + !cpus_have_const_cap(ARM64_WORKAROUND_843419) || + ((u64)place & 0xfff) < 0xff8) + return reloc_insn_imm(RELOC_OP_PAGE, place, val, 12, 21, + AARCH64_INSN_IMM_ADR); + + /* patch ADRP to ADR if it is in range */ + if (!reloc_insn_imm(RELOC_OP_PREL, place, val & ~0xfff, 0, 21, + AARCH64_INSN_IMM_ADR)) { + insn = le32_to_cpu(*place); + insn &= ~BIT(31); + } else { + /* out of range for ADR -> emit a veneer */ + val = module_emit_adrp_veneer(mod, place, val & ~0xfff); + if (!val) + return -ENOEXEC; + insn = aarch64_insn_gen_branch_imm((u64)place, val, + AARCH64_INSN_BRANCH_NOLINK); + } + + *place = cpu_to_le32(insn); + return 0; +} + int apply_relocate_add(Elf64_Shdr *sechdrs, const char *strtab, unsigned int symindex, @@ -336,14 +365,13 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 0, 21, AARCH64_INSN_IMM_ADR); break; -#ifndef CONFIG_ARM64_ERRATUM_843419 case R_AARCH64_ADR_PREL_PG_HI21_NC: overflow_check = false; case R_AARCH64_ADR_PREL_PG_HI21: - ovf = reloc_insn_imm(RELOC_OP_PAGE, loc, val, 12, 21, - AARCH64_INSN_IMM_ADR); + ovf = reloc_insn_adrp(me, loc, val); + if (ovf && ovf != -ERANGE) + return ovf; break; -#endif case R_AARCH64_ADD_ABS_LO12_NC: case R_AARCH64_LDST8_ABS_LO12_NC: overflow_check = false; @@ -386,6 +414,8 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) && ovf == -ERANGE) { val = module_emit_plt_entry(me, loc, &rel[i], sym); + if (!val) + return -ENOEXEC; ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 2, 26, AARCH64_INSN_IMM_26); } |
