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/* * livepatch.c - x86-specific Kernel Live Patching Core * * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com> * Copyright (C) 2014 SUSE * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include <linux/module.h> #include <linux/uaccess.h> #include <asm/elf.h> #include <asm/livepatch.h> /** * klp_write_module_reloc() - write a relocation in a module * @mod: module in which the section to be modified is found * @type: ELF relocation type (see asm/elf.h) * @loc: address that the relocation should be written to * @value: relocation value (sym address + addend) * * This function writes a relocation to the specified location for * a particular module. */ int klp_write_module_reloc(struct module *mod, unsigned long type, unsigned long loc, unsigned long value) { size_t size = 4; unsigned long val; unsigned long core = (unsigned long)mod->core_layout.base; unsigned long core_size = mod->core_layout.size; switch (type) { case R_X86_64_NONE: return 0; case R_X86_64_64: val = value; size = 8; break; case R_X86_64_32: val = (u32)value; break; case R_X86_64_32S: val = (s32)value; break; case R_X86_64_PC32: val = (u32)(value - loc); break; default: /* unsupported relocation type */ return -EINVAL; } if (loc < core || loc >= core + core_size) /* loc does not point to any symbol inside the module */ return -EINVAL; return probe_kernel_write((void *)loc, &val, size); }
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