projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 4e0c2098 YS |
2 | #include <linux/moduleloader.h> |
| 3 | #include <linux/elf.h> | |
| 4 | #include <linux/vmalloc.h> | |
| 5 | #include <linux/fs.h> | |
| 6 | #include <linux/string.h> | |
| 7 | #include <linux/kernel.h> | |
| 8 | ||
| 9 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
| 10 | const char *strtab, | |
| 11 | unsigned int symindex, | |
| 12 | unsigned int relsec, | |
| 13 | struct module *me) | |
| 14 | { | |
| 15 | unsigned int i; | |
| 16 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; | |
| 17 | ||
| 18 | pr_debug("Applying relocate section %u to %u\n", relsec, | |
| 19 | sechdrs[relsec].sh_info); | |
| 20 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { | |
| 21 | /* This is where to make the change */ | |
| 22 | uint32_t *loc = | |
| 23 | (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr | |
| 24 | + rela[i].r_offset); | |
| 25 | /* This is the symbol it is referring to. Note that all | |
| 26 | undefined symbols have been resolved. */ | |
| 27 | Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
| 28 | + ELF32_R_SYM(rela[i].r_info); | |
| 29 | uint32_t v = sym->st_value + rela[i].r_addend; | |
| 30 | ||
| 31 | switch (ELF32_R_TYPE(rela[i].r_info)) { | |
| 32 | case R_H8_DIR24R8: | |
| 33 | loc = (uint32_t *)((uint32_t)loc - 1); | |
| 34 | *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v); | |
| 35 | break; | |
| 36 | case R_H8_DIR24A8: | |
| 37 | if (ELF32_R_SYM(rela[i].r_info)) | |
| 38 | *loc += v; | |
| 39 | break; | |
| 40 | case R_H8_DIR32: | |
| 41 | case R_H8_DIR32A16: | |
| 42 | *loc += v; | |
| 43 | break; | |
| 44 | case R_H8_PCREL16: | |
| 45 | v -= (unsigned long)loc + 2; | |
| 46 | if ((Elf32_Sword)v > 0x7fff || | |
| 47 | (Elf32_Sword)v < -(Elf32_Sword)0x8000) | |
| 48 | goto overflow; | |
| 49 | else | |
| 50 | *(unsigned short *)loc = v; | |
| 51 | break; | |
| 52 | case R_H8_PCREL8: | |
| 53 | v -= (unsigned long)loc + 1; | |
| 54 | if ((Elf32_Sword)v > 0x7f || | |
| 55 | (Elf32_Sword)v < -(Elf32_Sword)0x80) | |
| 56 | goto overflow; | |
| 57 | else | |
| 58 | *(unsigned char *)loc = v; | |
| 59 | break; | |
| 60 | default: | |
| 61 | pr_err("module %s: Unknown relocation: %u\n", | |
| 62 | me->name, ELF32_R_TYPE(rela[i].r_info)); | |
| 63 | return -ENOEXEC; | |
| 64 | } | |
| 65 | } | |
| 66 | return 0; | |
| 67 | overflow: | |
| 68 | pr_err("module %s: relocation offset overflow: %08x\n", | |
| 69 | me->name, rela[i].r_offset); | |
| 70 | return -ENOEXEC; | |
| 71 | } |