/* vi: set sw=4 ts=4: */ /* * Mini insmod implementation for busybox * * Copyright (C) 1999,2000 by Lineo, inc. * Written by Erik Andersen * and Ron Alder * * Modified by Bryan Rittmeyer to support SH4 * and (theoretically) SH3. Note that there is still no true * multiple architecture support. You just get SH3|SH4|i386, despite * the mention of ARM and m68k--which may or may not work (but * almost certainly do not, due to at least MATCH_MACHINE). I have * only tested SH4 in little endian mode. * * Based almost entirely on the Linux modutils-2.3.11 implementation. * Copyright 1996, 1997 Linux International. * New implementation contributed by Richard Henderson * Based on original work by Bjorn Ekwall * Restructured (and partly rewritten) by: * Björn Ekwall February 1999 * * 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, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include "../insmod.h" #include "busybox.h" #include #include #include #include #include #include #include #include #include //---------------------------------------------------------------------------- //--------modutils module.h, lines 45-242 //---------------------------------------------------------------------------- /* Definitions for the Linux module syscall interface. Copyright 1996, 1997 Linux International. Contributed by Richard Henderson This file is part of the Linux modutils. 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef MODUTILS_MODULE_H #define MODUTILS_MODULE_H 1 #ident "$Id$" /* This file contains the structures used by the 2.0 and 2.1 kernels. We do not use the kernel headers directly because we do not wish to be dependant on a particular kernel version to compile insmod. */ /*======================================================================*/ /* The structures used by Linux 2.0. */ /* The symbol format used by get_kernel_syms(2). */ struct old_kernel_sym { unsigned long value; char name[60]; }; struct old_module_ref { unsigned long module; /* kernel addresses */ unsigned long next; }; struct old_module_symbol { unsigned long addr; unsigned long name; }; struct old_symbol_table { int size; /* total, including string table!!! */ int n_symbols; int n_refs; struct old_module_symbol symbol[0]; /* actual size defined by n_symbols */ struct old_module_ref ref[0]; /* actual size defined by n_refs */ }; struct old_mod_routines { unsigned long init; unsigned long cleanup; }; struct old_module { unsigned long next; unsigned long ref; /* the list of modules that refer to me */ unsigned long symtab; unsigned long name; int size; /* size of module in pages */ unsigned long addr; /* address of module */ int state; unsigned long cleanup; /* cleanup routine */ }; /* Sent to init_module(2) or'ed into the code size parameter. */ #define OLD_MOD_AUTOCLEAN 0x40000000 /* big enough, but no sign problems... */ int get_kernel_syms(struct old_kernel_sym *); int old_sys_init_module(const char *name, char *code, unsigned codesize, struct old_mod_routines *, struct old_symbol_table *); /*======================================================================*/ /* For sizeof() which are related to the module platform and not to the environment isnmod is running in, use sizeof_xx instead of sizeof(xx). */ #define tgt_sizeof_char sizeof(char) #define tgt_sizeof_short sizeof(short) #define tgt_sizeof_int sizeof(int) #define tgt_sizeof_long sizeof(long) #define tgt_sizeof_char_p sizeof(char *) #define tgt_sizeof_void_p sizeof(void *) #define tgt_long long #if defined(__sparc__) && !defined(__sparc_v9__) && defined(ARCH_sparc64) #undef tgt_sizeof_long #undef tgt_sizeof_char_p #undef tgt_sizeof_void_p #undef tgt_long #define tgt_sizeof_long 8 #define tgt_sizeof_char_p 8 #define tgt_sizeof_void_p 8 #define tgt_long long long #endif /*======================================================================*/ /* The structures used in Linux 2.1. */ /* Note: new_module_symbol does not use tgt_long intentionally */ struct new_module_symbol { unsigned long value; unsigned long name; }; struct new_module_persist; struct new_module_ref { unsigned tgt_long dep; /* kernel addresses */ unsigned tgt_long ref; unsigned tgt_long next_ref; }; struct new_module { unsigned tgt_long size_of_struct; /* == sizeof(module) */ unsigned tgt_long next; unsigned tgt_long name; unsigned tgt_long size; tgt_long usecount; unsigned tgt_long flags; /* AUTOCLEAN et al */ unsigned nsyms; unsigned ndeps; unsigned tgt_long syms; unsigned tgt_long deps; unsigned tgt_long refs; unsigned tgt_long init; unsigned tgt_long cleanup; unsigned tgt_long ex_table_start; unsigned tgt_long ex_table_end; #ifdef __alpha__ unsigned tgt_long gp; #endif /* Everything after here is extension. */ unsigned tgt_long persist_start; unsigned tgt_long persist_end; unsigned tgt_long can_unload; unsigned tgt_long runsize; }; struct new_module_info { unsigned long addr; unsigned long size; unsigned long flags; long usecount; }; /* Bits of module.flags. */ #define NEW_MOD_RUNNING 1 #define NEW_MOD_DELETED 2 #define NEW_MOD_AUTOCLEAN 4 #define NEW_MOD_VISITED 8 #define NEW_MOD_USED_ONCE 16 int new_sys_init_module(const char *name, const struct new_module *); int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret); /* Values for query_module's which. */ #define QM_MODULES 1 #define QM_DEPS 2 #define QM_REFS 3 #define QM_SYMBOLS 4 #define QM_INFO 5 /*======================================================================*/ /* The system calls unchanged between 2.0 and 2.1. */ unsigned long create_module(const char *, size_t); int delete_module(const char *); #endif /* module.h */ //---------------------------------------------------------------------------- //--------end of modutils module.h //---------------------------------------------------------------------------- //---------------------------------------------------------------------------- //--------modutils obj.h, lines 253-462 //---------------------------------------------------------------------------- /* Elf object file loading and relocation routines. Copyright 1996, 1997 Linux International. Contributed by Richard Henderson This file is part of the Linux modutils. 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef MODUTILS_OBJ_H #define MODUTILS_OBJ_H 1 #ident "$Id$" /* The relocatable object is manipulated using elfin types. */ #include #include /* Machine-specific elf macros for i386 et al. */ /* the SH changes have only been tested on the SH4 in =little endian= mode */ /* I'm not sure about big endian, so let's warn: */ #if (defined(__SH4__) || defined(__SH3__)) && defined(__BIG_ENDIAN__) #error insmod.c may require changes for use on big endian SH4/SH3 #endif /* it may or may not work on the SH1/SH2... So let's error on those also */ #if (defined(__sh__) && (!(defined(__SH3__) || defined(__SH4__)))) #error insmod.c may require changes for non-SH3/SH4 use #endif #define ELFCLASSM ELFCLASS32 #define ELFDATAM ELFDATA2LSB #if defined(__sh__) #define MATCH_MACHINE(x) (x == EM_SH) #define SHT_RELM SHT_RELA #define Elf32_RelM Elf32_Rela #else /* presumably we can use these for anything but the SH */ /* this is the previous behavior, but it does result in insmod.c being broken on anything except i386 */ #define MATCH_MACHINE(x) (x == EM_386) #define SHT_RELM SHT_REL #define Elf32_RelM Elf32_Rel #endif #ifndef ElfW # if ELFCLASSM == ELFCLASS32 # define ElfW(x) Elf32_ ## x # define ELFW(x) ELF32_ ## x # else # define ElfW(x) Elf64_ ## x # define ELFW(x) ELF64_ ## x # endif #endif /* For some reason this is missing from libc5. */ #ifndef ELF32_ST_INFO # define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) #endif #ifndef ELF64_ST_INFO # define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) #endif struct obj_string_patch; struct obj_symbol_patch; struct obj_section { ElfW(Shdr) header; const char *name; char *contents; struct obj_section *load_next; int idx; }; struct obj_symbol { struct obj_symbol *next; /* hash table link */ const char *name; unsigned long value; unsigned long size; int secidx; /* the defining section index/module */ int info; int ksymidx; /* for export to the kernel symtab */ int referenced; /* actually used in the link */ }; /* Hardcode the hash table size. We shouldn't be needing so many symbols that we begin to degrade performance, and we get a big win by giving the compiler a constant divisor. */ #define HASH_BUCKETS 521 struct obj_file { ElfW(Ehdr) header; ElfW(Addr) baseaddr; struct obj_section **sections; struct obj_section *load_order; struct obj_section **load_order_search_start; struct obj_string_patch *string_patches; struct obj_symbol_patch *symbol_patches; int (*symbol_cmp)(const char *, const char *); unsigned long (*symbol_hash)(const char *); unsigned long local_symtab_size; struct obj_symbol **local_symtab; struct obj_symbol *symtab[HASH_BUCKETS]; }; enum obj_reloc { obj_reloc_ok, obj_reloc_overflow, obj_reloc_dangerous, obj_reloc_unhandled }; struct obj_string_patch { struct obj_string_patch *next; int reloc_secidx; ElfW(Addr) reloc_offset; ElfW(Addr) string_offset; }; struct obj_symbol_patch { struct obj_symbol_patch *next; int reloc_secidx; ElfW(Addr) reloc_offset; struct obj_symbol *sym; }; /* Generic object manipulation routines. */ unsigned long obj_elf_hash(const char *); unsigned long obj_elf_hash_n(const char *, unsigned long len); struct obj_symbol *obj_add_symbol (struct obj_file *f, const char *name, unsigned long symidx, int info, int secidx, ElfW(Addr) value, unsigned long size); struct obj_symbol *obj_find_symbol (struct obj_file *f, const char *name); ElfW(Addr) obj_symbol_final_value(struct obj_file *f, struct obj_symbol *sym); void obj_set_symbol_compare(struct obj_file *f, int (*cmp)(const char *, const char *), unsigned long (*hash)(const char *)); struct obj_section *obj_find_section (struct obj_file *f, const char *name); void obj_insert_section_load_order (struct obj_file *f, struct obj_section *sec); struct obj_section *obj_create_alloced_section (struct obj_file *f, const char *name, unsigned long align, unsigned long size); struct obj_section *obj_create_alloced_section_first (struct obj_file *f, const char *name, unsigned long align, unsigned long size); void *obj_extend_section (struct obj_section *sec, unsigned long more); int obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, const char *string); int obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, struct obj_symbol *sym); int obj_check_undefineds(struct obj_file *f); void obj_allocate_commons(struct obj_file *f); unsigned long obj_load_size (struct obj_file *f); int obj_relocate (struct obj_file *f, ElfW(Addr) base); struct obj_file *obj_load(FILE *f); int obj_create_image (struct obj_file *f, char *image); /* Architecture specific manipulation routines. */ struct obj_file *arch_new_file (void); struct obj_section *arch_new_section (void); struct obj_symbol *arch_new_symbol (void); enum obj_reloc arch_apply_relocation (struct obj_file *f, struct obj_section *targsec, struct obj_section *symsec, struct obj_symbol *sym, ElfW(RelM) *rel, ElfW(Addr) value); int arch_create_got (struct obj_file *f); struct new_module; int arch_init_module (struct obj_file *f, struct new_module *); #endif /* obj.h */ //---------------------------------------------------------------------------- //--------end of modutils obj.h //---------------------------------------------------------------------------- #define _PATH_MODULES "/lib/modules" #define STRVERSIONLEN 32 #if !defined(BB_FEATURE_INSMOD_NEW_KERNEL) && !defined(BB_FEATURE_INSMOD_OLD_KERNEL) #error "Must have ether BB_FEATURE_INSMOD_NEW_KERNEL or BB_FEATURE_INSMOD_OLD_KERNEL defined" #endif /*======================================================================*/ int flag_force_load = 1; int flag_autoclean = 0; int flag_export = 1; /*======================================================================*/ /* previously, these were named i386_* but since we could be compiling for the sh, I've renamed them to the more general arch_* These structures are the same between the x86 and SH, and we can't support anything else right now anyway. In the future maybe they should be #if defined'd */ struct arch_got_entry { int offset; unsigned offset_done:1; unsigned reloc_done:1; }; struct arch_file { struct obj_file root; struct obj_section *got; }; struct arch_symbol { struct obj_symbol root; struct arch_got_entry gotent; }; struct external_module { const char *name; ElfW(Addr) addr; int used; size_t nsyms; struct new_module_symbol *syms; }; struct new_module_symbol *ksyms; size_t nksyms; struct external_module *ext_modules; int n_ext_modules; int n_ext_modules_used; /* Some firendly syscalls to cheer everyone's day... */ #define __NR_new_sys_init_module __NR_init_module _syscall2(int, new_sys_init_module, const char *, name, const struct new_module *, info) #define __NR_old_sys_init_module __NR_init_module _syscall5(int, old_sys_init_module, const char *, name, char *, code, unsigned, codesize, struct old_mod_routines *, routines, struct old_symbol_table *, symtab) #ifndef BB_RMMOD _syscall1(int, delete_module, const char *, name) #else extern int delete_module(const char *); #endif /* This is kind of troublesome. See, we don't actually support the m68k or the arm the same way we support i386 and (now) sh. In doing my SH patch, I just assumed that whatever works for i386 also works for m68k and arm since currently insmod.c does nothing special for them. If this isn't true, the below line is rather misleading IMHO, and someone should either change it or add more proper architecture-dependent support for these boys. -- Bryan Rittmeyer */ #if defined(__i386__) || defined(__m68k__) || defined(__arm__) /* Jump through hoops to fixup error return codes */ #define __NR__create_module __NR_create_module static inline _syscall2(long, _create_module, const char *, name, size_t, size) unsigned long create_module(const char *name, size_t size) { long ret = _create_module(name, size); if (ret == -1 && errno > 125) { ret = -errno; errno = 0; } return ret; } #else _syscall2(unsigned long, create_module, const char *, name, size_t, size) #endif static char m_filename[BUFSIZ + 1] = "\0"; static char m_fullName[BUFSIZ + 1] = "\0"; /*======================================================================*/ /*======================================================================*/ struct obj_file *arch_new_file(void) { struct arch_file *f; f = xmalloc(sizeof(*f)); f->got = NULL; return &f->root; } struct obj_section *arch_new_section(void) { return xmalloc(sizeof(struct obj_section)); } struct obj_symbol *arch_new_symbol(void) { struct arch_symbol *sym; sym = xmalloc(sizeof(*sym)); memset(&sym->gotent, 0, sizeof(sym->gotent)); return &sym->root; } enum obj_reloc arch_apply_relocation(struct obj_file *f, struct obj_section *targsec, struct obj_section *symsec, struct obj_symbol *sym, #if defined(__sh__) Elf32_Rela * rel, Elf32_Addr v) #else Elf32_Rel * rel, Elf32_Addr v) #endif { struct arch_file *ifile = (struct arch_file *) f; struct arch_symbol *isym = (struct arch_symbol *) sym; Elf32_Addr *loc = (Elf32_Addr *) (targsec->contents + rel->r_offset); Elf32_Addr dot = targsec->header.sh_addr + rel->r_offset; Elf32_Addr got = ifile->got ? ifile->got->header.sh_addr : 0; enum obj_reloc ret = obj_reloc_ok; switch (ELF32_R_TYPE(rel->r_info)) { /* even though these constants seem to be the same for the i386 and the sh, we "#if define" them for clarity and in case that ever changes */ #if defined(__sh__) case R_SH_NONE: #else case R_386_NONE: #endif break; #if defined(__sh__) case R_SH_DIR32: #else case R_386_32: #endif *loc += v; break; #if defined(__sh__) case R_SH_REL32: #else case R_386_PLT32: case R_386_PC32: #endif *loc += v - dot; break; #if defined(__sh__) case R_SH_PLT32: *loc = v - dot; break; #endif #if defined(__sh__) case R_SH_GLOB_DAT: case R_SH_JMP_SLOT: *loc = v; break; #else case R_386_GLOB_DAT: case R_386_JMP_SLOT: *loc = v; break; #endif #if defined(__sh__) case R_SH_RELATIVE: *loc += f->baseaddr + rel->r_addend; break; #else case R_386_RELATIVE: *loc += f->baseaddr; break; #endif #if defined(__sh__) case R_SH_GOTPC: assert(got != 0); *loc += got - dot + rel->r_addend;; break; #else case R_386_GOTPC: assert(got != 0); *loc += got - dot; break; #endif #if defined(__sh__) case R_SH_GOT32: assert(isym != NULL); if (!isym->gotent.reloc_done) { isym->gotent.reloc_done = 1; *(Elf32_Addr *) (ifile->got->contents + isym->gotent.offset) = v; } *loc += isym->gotent.offset + rel->r_addend; break; #else case R_386_GOT32: assert(isym != NULL); if (!isym->gotent.reloc_done) { isym->gotent.reloc_done = 1; *(Elf32_Addr *) (ifile->got->contents + isym->gotent.offset) = v; } *loc += isym->gotent.offset; break; #endif #if defined(__sh__) case R_SH_GOTOFF: #else case R_386_GOTOFF: #endif assert(got != 0); *loc += v - got; break; default: ret = obj_reloc_unhandled; break; } return ret; } int arch_create_got(struct obj_file *f) { struct arch_file *ifile = (struct arch_file *) f; int i, n, offset = 0, gotneeded = 0; n = ifile->root.header.e_shnum; for (i = 0; i < n; ++i) { struct obj_section *relsec, *symsec, *strsec; #if defined(__sh__) Elf32_Rela *rel, *relend; #else Elf32_Rel *rel, *relend; #endif Elf32_Sym *symtab; const char *strtab; relsec = ifile->root.sections[i]; if (relsec->header.sh_type != SHT_REL) continue; symsec = ifile->root.sections[relsec->header.sh_link]; strsec = ifile->root.sections[symsec->header.sh_link]; #if defined(__sh__) rel = (Elf32_Rela *) relsec->contents; relend = rel + (relsec->header.sh_size / sizeof(Elf32_Rela)); #else rel = (Elf32_Rel *) relsec->contents; relend = rel + (relsec->header.sh_size / sizeof(Elf32_Rel)); #endif symtab = (Elf32_Sym *) symsec->contents; strtab = (const char *) strsec->contents; for (; rel < relend; ++rel) { Elf32_Sym *extsym; struct arch_symbol *intsym; const char *name; switch (ELF32_R_TYPE(rel->r_info)) { #if defined(__sh__) case R_SH_GOTPC: case R_SH_GOTOFF: #else case R_386_GOTPC: case R_386_GOTOFF: #endif gotneeded = 1; default: continue; #if defined(__sh__) case R_SH_GOT32: #else case R_386_GOT32: #endif break; } extsym = &symtab[ELF32_R_SYM(rel->r_info)]; if (extsym->st_name) name = strtab + extsym->st_name; else name = f->sections[extsym->st_shndx]->name; intsym = (struct arch_symbol *) obj_find_symbol(&ifile->root, name); if (!intsym->gotent.offset_done) { intsym->gotent.offset_done = 1; intsym->gotent.offset = offset; offset += 4; } } } if (offset > 0 || gotneeded) ifile->got = obj_create_alloced_section(&ifile->root, ".got", 4, offset); return 1; } int arch_init_module(struct obj_file *f, struct new_module *mod) { return 1; } /*======================================================================*/ /* Standard ELF hash function. */ inline unsigned long obj_elf_hash_n(const char *name, unsigned long n) { unsigned long h = 0; unsigned long g; unsigned char ch; while (n > 0) { ch = *name++; h = (h << 4) + ch; if ((g = (h & 0xf0000000)) != 0) { h ^= g >> 24; h &= ~g; } n--; } return h; } unsigned long obj_elf_hash(const char *name) { return obj_elf_hash_n(name, strlen(name)); } #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING /* Get the kernel version in the canonical integer form. */ static int get_kernel_version(char str[STRVERSIONLEN]) { struct utsname uts_info; char *p, *q; int a, b, c; if (uname(&uts_info) < 0) return -1; strncpy(str, uts_info.release, STRVERSIONLEN); p = uts_info.release; a = strtoul(p, &p, 10); if (*p != '.') return -1; b = strtoul(p + 1, &p, 10); if (*p != '.') return -1; c = strtoul(p + 1, &q, 10); if (p + 1 == q) return -1; return a << 16 | b << 8 | c; } /* String comparison for non-co-versioned kernel and module. */ static int ncv_strcmp(const char *a, const char *b) { size_t alen = strlen(a), blen = strlen(b); if (blen == alen + 10 && b[alen] == '_' && b[alen + 1] == 'R') return strncmp(a, b, alen); else if (alen == blen + 10 && a[blen] == '_' && a[blen + 1] == 'R') return strncmp(a, b, blen); else return strcmp(a, b); } /* String hashing for non-co-versioned kernel and module. Here we are simply forced to drop the crc from the hash. */ static unsigned long ncv_symbol_hash(const char *str) { size_t len = strlen(str); if (len > 10 && str[len - 10] == '_' && str[len - 9] == 'R') len -= 10; return obj_elf_hash_n(str, len); } void obj_set_symbol_compare(struct obj_file *f, int (*cmp) (const char *, const char *), unsigned long (*hash) (const char *)) { if (cmp) f->symbol_cmp = cmp; if (hash) { struct obj_symbol *tmptab[HASH_BUCKETS], *sym, *next; int i; f->symbol_hash = hash; memcpy(tmptab, f->symtab, sizeof(tmptab)); memset(f->symtab, 0, sizeof(f->symtab)); for (i = 0; i < HASH_BUCKETS; ++i) for (sym = tmptab[i]; sym; sym = next) { unsigned long h = hash(sym->name) % HASH_BUCKETS; next = sym->next; sym->next = f->symtab[h]; f->symtab[h] = sym; } } } #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */ struct obj_symbol *obj_add_symbol(struct obj_file *f, const char *name, unsigned long symidx, int info, int secidx, ElfW(Addr) value, unsigned long size) { struct obj_symbol *sym; unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS; int n_type = ELFW(ST_TYPE) (info); int n_binding = ELFW(ST_BIND) (info); for (sym = f->symtab[hash]; sym; sym = sym->next) if (f->symbol_cmp(sym->name, name) == 0) { int o_secidx = sym->secidx; int o_info = sym->info; int o_type = ELFW(ST_TYPE) (o_info); int o_binding = ELFW(ST_BIND) (o_info); /* A redefinition! Is it legal? */ if (secidx == SHN_UNDEF) return sym; else if (o_secidx == SHN_UNDEF) goto found; else if (n_binding == STB_GLOBAL && o_binding == STB_LOCAL) { /* Cope with local and global symbols of the same name in the same object file, as might have been created by ld -r. The only reason locals are now seen at this level at all is so that we can do semi-sensible things with parameters. */ struct obj_symbol *nsym, **p; nsym = arch_new_symbol(); nsym->next = sym->next; nsym->ksymidx = -1; /* Excise the old (local) symbol from the hash chain. */ for (p = &f->symtab[hash]; *p != sym; p = &(*p)->next) continue; *p = sym = nsym; goto found; } else if (n_binding == STB_LOCAL) { /* Another symbol of the same name has already been defined. Just add this to the local table. */ sym = arch_new_symbol(); sym->next = NULL; sym->ksymidx = -1; f->local_symtab[symidx] = sym; goto found; } else if (n_binding == STB_WEAK) return sym; else if (o_binding == STB_WEAK) goto found; /* Don't unify COMMON symbols with object types the programmer doesn't expect. */ else if (secidx == SHN_COMMON && (o_type == STT_NOTYPE || o_type == STT_OBJECT)) return sym; else if (o_secidx == SHN_COMMON && (n_type == STT_NOTYPE || n_type == STT_OBJECT)) goto found; else { /* Don't report an error if the symbol is coming from the kernel or some external module. */ if (secidx <= SHN_HIRESERVE) errorMsg("%s multiply defined", name); return sym; } } /* Completely new symbol. */ sym = arch_new_symbol(); sym->next = f->symtab[hash]; f->symtab[hash] = sym; sym->ksymidx = -1; if (ELFW(ST_BIND) (info) == STB_LOCAL) f->local_symtab[symidx] = sym; found: sym->name = name; sym->value = value; sym->size = size; sym->secidx = secidx; sym->info = info; return sym; } struct obj_symbol *obj_find_symbol(struct obj_file *f, const char *name) { struct obj_symbol *sym; unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS; for (sym = f->symtab[hash]; sym; sym = sym->next) if (f->symbol_cmp(sym->name, name) == 0) return sym; return NULL; } ElfW(Addr) obj_symbol_final_value(struct obj_file * f, struct obj_symbol * sym) { if (sym) { if (sym->secidx >= SHN_LORESERVE) return sym->value; return sym->value + f->sections[sym->secidx]->header.sh_addr; } else { /* As a special case, a NULL sym has value zero. */ return 0; } } struct obj_section *obj_find_section(struct obj_file *f, const char *name) { int i, n = f->header.e_shnum; for (i = 0; i < n; ++i) if (strcmp(f->sections[i]->name, name) == 0) return f->sections[i]; return NULL; } static int obj_load_order_prio(struct obj_section *a) { unsigned long af, ac; af = a->header.sh_flags; ac = 0; if (a->name[0] != '.' || strlen(a->name) != 10 || strcmp(a->name + 5, ".init")) ac |= 32; if (af & SHF_ALLOC) ac |= 16; if (!(af & SHF_WRITE)) ac |= 8; if (af & SHF_EXECINSTR) ac |= 4; if (a->header.sh_type != SHT_NOBITS) ac |= 2; return ac; } void obj_insert_section_load_order(struct obj_file *f, struct obj_section *sec) { struct obj_section **p; int prio = obj_load_order_prio(sec); for (p = f->load_order_search_start; *p; p = &(*p)->load_next) if (obj_load_order_prio(*p) < prio) break; sec->load_next = *p; *p = sec; } struct obj_section *obj_create_alloced_section(struct obj_file *f, const char *name, unsigned long align, unsigned long size) { int newidx = f->header.e_shnum++; struct obj_section *sec; f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec)); f->sections[newidx] = sec = arch_new_section(); memset(sec, 0, sizeof(*sec)); sec->header.sh_type = SHT_PROGBITS; sec->header.sh_flags = SHF_WRITE | SHF_ALLOC; sec->header.sh_size = size; sec->header.sh_addralign = align; sec->name = name; sec->idx = newidx; if (size) sec->contents = xmalloc(size); obj_insert_section_load_order(f, sec); return sec; } struct obj_section *obj_create_alloced_section_first(struct obj_file *f, const char *name, unsigned long align, unsigned long size) { int newidx = f->header.e_shnum++; struct obj_section *sec; f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec)); f->sections[newidx] = sec = arch_new_section(); memset(sec, 0, sizeof(*sec)); sec->header.sh_type = SHT_PROGBITS; sec->header.sh_flags = SHF_WRITE | SHF_ALLOC; sec->header.sh_size = size; sec->header.sh_addralign = align; sec->name = name; sec->idx = newidx; if (size) sec->contents = xmalloc(size); sec->load_next = f->load_order; f->load_order = sec; if (f->load_order_search_start == &f->load_order) f->load_order_search_start = &sec->load_next; return sec; } void *obj_extend_section(struct obj_section *sec, unsigned long more) { unsigned long oldsize = sec->header.sh_size; sec->contents = xrealloc(sec->contents, sec->header.sh_size += more); return sec->contents + oldsize; } /* Conditionally add the symbols from the given symbol set to the new module. */ static int add_symbols_from( struct obj_file *f, int idx, struct new_module_symbol *syms, size_t nsyms) { struct new_module_symbol *s; size_t i; int used = 0; for (i = 0, s = syms; i < nsyms; ++i, ++s) { /* Only add symbols that are already marked external. If we override locals we may cause problems for argument initialization. We will also create a false dependency on the module. */ struct obj_symbol *sym; sym = obj_find_symbol(f, (char *) s->name); if (sym && !ELFW(ST_BIND) (sym->info) == STB_LOCAL) { sym = obj_add_symbol(f, (char *) s->name, -1, ELFW(ST_INFO) (STB_GLOBAL, STT_NOTYPE), idx, s->value, 0); /* Did our symbol just get installed? If so, mark the module as "used". */ if (sym->secidx == idx) used = 1; } } return used; } static void add_kernel_symbols(struct obj_file *f) { struct external_module *m; int i, nused = 0; /* Add module symbols first. */ for (i = 0, m = ext_modules; i < n_ext_modules; ++i, ++m) if (m->nsyms && add_symbols_from(f, SHN_HIRESERVE + 2 + i, m->syms, m->nsyms)) m->used = 1, ++nused; n_ext_modules_used = nused; /* And finally the symbols from the kernel proper. */ if (nksyms) add_symbols_from(f, SHN_HIRESERVE + 1, ksyms, nksyms); } static char *get_modinfo_value(struct obj_file *f, const char *key) { struct obj_section *sec; char *p, *v, *n, *ep; size_t klen = strlen(key); sec = obj_find_section(f, ".modinfo"); if (sec == NULL) return NULL; p = sec->contents; ep = p + sec->header.sh_size; while (p < ep) { v = strchr(p, '='); n = strchr(p, '\0'); if (v) { if (p + klen == v && strncmp(p, key, klen) == 0) return v + 1; } else { if (p + klen == n && strcmp(p, key) == 0) return n; } p = n + 1; } return NULL; } /*======================================================================*/ /* Functions relating to module loading in pre 2.1 kernels. */ static int old_process_module_arguments(struct obj_file *f, int argc, char **argv) { while (argc > 0) { char *p, *q; struct obj_symbol *sym; int *loc; p = *argv; if ((q = strchr(p, '=')) == NULL) { argc--; continue; } *q++ = '\0'; sym = obj_find_symbol(f, p); /* Also check that the parameter was not resolved from the kernel. */ if (sym == NULL || sym->secidx > SHN_HIRESERVE) { errorMsg("symbol for parameter %s not found", p); return 0; } loc = (int *) (f->sections[sym->secidx]->contents + sym->value); /* Do C quoting if we begin with a ". */ if (*q == '"') { char *r, *str; str = alloca(strlen(q)); for (r = str, q++; *q != '"'; ++q, ++r) { if (*q == '\0') { errorMsg("improperly terminated string argument for %s", p); return 0; } else if (*q == '\\') switch (*++q) { case 'a': *r = '\a'; break; case 'b': *r = '\b'; break; case 'e': *r = '\033'; break; case 'f': *r = '\f'; break; case 'n': *r = '\n'; break; case 'r': *r = '\r'; break; case 't': *r = '\t'; break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': { int c = *q - '0'; if (q[1] >= '0' && q[1] <= '7') { c = (c * 8) + *++q - '0'; if (q[1] >= '0' && q[1] <= '7') c = (c * 8) + *++q - '0'; } *r = c; } break; default: *r = *q; break; } else *r = *q; } *r = '\0'; obj_string_patch(f, sym->secidx, sym->value, str); } else if (*q >= '0' && *q <= '9') { do *loc++ = strtoul(q, &q, 0); while (*q++ == ','); } else { char *contents = f->sections[sym->secidx]->contents; char *loc = contents + sym->value; char *r; /* To search for commas */ /* Break the string with comas */ while ((r = strchr(q, ',')) != (char *) NULL) { *r++ = '\0'; obj_string_patch(f, sym->secidx, loc - contents, q); loc += sizeof(char *); q = r; } /* last part */ obj_string_patch(f, sym->secidx, loc - contents, q); } argc--, argv++; } return 1; } #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING static int old_is_module_checksummed(struct obj_file *f) { return obj_find_symbol(f, "Using_Versions") != NULL; } /* Get the module's kernel version in the canonical integer form. */ static int old_get_module_version(struct obj_file *f, char str[STRVERSIONLEN]) { struct obj_symbol *sym; char *p, *q; int a, b, c; sym = obj_find_symbol(f, "kernel_version"); if (sym == NULL) return -1; p = f->sections[sym->secidx]->contents + sym->value; strncpy(str, p, STRVERSIONLEN); a = strtoul(p, &p, 10); if (*p != '.') return -1; b = strtoul(p + 1, &p, 10); if (*p != '.') return -1; c = strtoul(p + 1, &q, 10); if (p + 1 == q) return -1; return a << 16 | b << 8 | c; } #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */ #ifdef BB_FEATURE_INSMOD_OLD_KERNEL /* Fetch all the symbols and divvy them up as appropriate for the modules. */ static int old_get_kernel_symbols(const char *m_name) { struct old_kernel_sym *ks, *k; struct new_module_symbol *s; struct external_module *mod; int nks, nms, nmod, i; nks = get_kernel_syms(NULL); if (nks < 0) { errorMsg("get_kernel_syms: %s: %s", m_name, strerror(errno)); return 0; } ks = k = xmalloc(nks * sizeof(*ks)); if (get_kernel_syms(ks) != nks) { logperror("inconsistency with get_kernel_syms -- is someone else " "playing with modules?"); free(ks); return 0; } /* Collect the module information. */ mod = NULL; nmod = -1; while (k->name[0] == '#' && k->name[1]) { struct old_kernel_sym *k2; struct new_module_symbol *s; /* Find out how many symbols this module has. */ for (k2 = k + 1; k2->name[0] != '#'; ++k2) continue; nms = k2 - k - 1; mod = xrealloc(mod, (++nmod + 1) * sizeof(*mod)); mod[nmod].name = k->name + 1; mod[nmod].addr = k->value; mod[nmod].used = 0; mod[nmod].nsyms = nms; mod[nmod].syms = s = (nms ? xmalloc(nms * sizeof(*s)) : NULL); for (i = 0, ++k; i < nms; ++i, ++s, ++k) { s->name = (unsigned long) k->name; s->value = k->value; } k = k2; } ext_modules = mod; n_ext_modules = nmod + 1; /* Now collect the symbols for the kernel proper. */ if (k->name[0] == '#') ++k; nksyms = nms = nks - (k - ks); ksyms = s = (nms ? xmalloc(nms * sizeof(*s)) : NULL); for (i = 0; i < nms; ++i, ++s, ++k) { s->name = (unsigned long) k->name; s->value = k->value; } return 1; } /* Return the kernel symbol checksum version, or zero if not used. */ static int old_is_kernel_checksummed(void) { /* Using_Versions is the first symbol. */ if (nksyms > 0 && strcmp((char *) ksyms[0].name, "Using_Versions") == 0) return ksyms[0].value; else return 0; } static int old_create_mod_use_count(struct obj_file *f) { struct obj_section *sec; sec = obj_create_alloced_section_first(f, ".moduse", sizeof(long), sizeof(long)); obj_add_symbol(f, "mod_use_count_", -1, ELFW(ST_INFO) (STB_LOCAL, STT_OBJECT), sec->idx, 0, sizeof(long)); return 1; } static int old_init_module(const char *m_name, struct obj_file *f, unsigned long m_size) { char *image; struct old_mod_routines routines; struct old_symbol_table *symtab; int ret; /* Create the symbol table */ { int nsyms = 0, strsize = 0, total; /* Size things first... */ if (flag_export) { int i; for (i = 0; i < HASH_BUCKETS; ++i) { struct obj_symbol *sym; for (sym = f->symtab[i]; sym; sym = sym->next) if (ELFW(ST_BIND) (sym->info) != STB_LOCAL && sym->secidx <= SHN_HIRESERVE) { sym->ksymidx = nsyms++; strsize += strlen(sym->name) + 1; } } } total = (sizeof(struct old_symbol_table) + nsyms * sizeof(struct old_module_symbol) + n_ext_modules_used * sizeof(struct old_module_ref) + strsize); symtab = xmalloc(total); symtab->size = total; symtab->n_symbols = nsyms; symtab->n_refs = n_ext_modules_used; if (flag_export && nsyms) { struct old_module_symbol *ksym; char *str; int i; ksym = symtab->symbol; str = ((char *) ksym + nsyms * sizeof(struct old_module_symbol) + n_ext_modules_used * sizeof(struct old_module_ref)); for (i = 0; i < HASH_BUCKETS; ++i) { struct obj_symbol *sym; for (sym = f->symtab[i]; sym; sym = sym->next) if (sym->ksymidx >= 0) { ksym->addr = obj_symbol_final_value(f, sym); ksym->name = (unsigned long) str - (unsigned long) symtab; str = stpcpy(str, sym->name) + 1; ksym++; } } } if (n_ext_modules_used) { struct old_module_ref *ref; int i; ref = (struct old_module_ref *) ((char *) symtab->symbol + nsyms * sizeof(struct old_module_symbol)); for (i = 0; i < n_ext_modules; ++i) if (ext_modules[i].used) ref++->module = ext_modules[i].addr; } } /* Fill in routines. */ routines.init = obj_symbol_final_value(f, obj_find_symbol(f, "init_module")); routines.cleanup = obj_symbol_final_value(f, obj_find_symbol(f, "cleanup_module")); /* Whew! All of the initialization is complete. Collect the final module image and give it to the kernel. */ image = xmalloc(m_size); obj_create_image(f, image); /* image holds the complete relocated module, accounting correctly for mod_use_count. However the old module kernel support assume that it is receiving something which does not contain mod_use_count. */ ret = old_sys_init_module(m_name, image + sizeof(long), m_size | (flag_autoclean ? OLD_MOD_AUTOCLEAN : 0), &routines, symtab); if (ret) errorMsg("init_module: %s: %s", m_name, strerror(errno)); free(image); free(symtab); return ret == 0; } #else #define old_create_mod_use_count(x) TRUE #define old_init_module(x, y, z) TRUE #endif /* BB_FEATURE_INSMOD_OLD_KERNEL */ /*======================================================================*/ /* Functions relating to module loading after 2.1.18. */ static int new_process_module_arguments(struct obj_file *f, int argc, char **argv) { while (argc > 0) { char *p, *q, *key; struct obj_symbol *sym; char *contents, *loc; int min, max, n; p = *argv; if ((q = strchr(p, '=')) == NULL) { argc--; continue; } key = alloca(q - p + 6); memcpy(key, "parm_", 5); memcpy(key + 5, p, q - p); key[q - p + 5] = 0; p = get_modinfo_value(f, key); key += 5; if (p == NULL) { errorMsg("invalid parameter %s", key); return 0; } sym = obj_find_symbol(f, key); /* Also check that the parameter was not resolved from the kernel. */ if (sym == NULL || sym->secidx > SHN_HIRESERVE) { errorMsg("symbol for parameter %s not found", key); return 0; } if (isdigit(*p)) { min = strtoul(p, &p, 10); if (*p == '-') max = strtoul(p + 1, &p, 10); else max = min; } else min = max = 1; contents = f->sections[sym->secidx]->contents; loc = contents + sym->value; n = (*++q != '\0'); while (1) { if ((*p == 's') || (*p == 'c')) { char *str; /* Do C quoting if we begin with a ", else slurp the lot. */ if (*q == '"') { char *r; str = alloca(strlen(q)); for (r = str, q++; *q != '"'; ++q, ++r) { if (*q == '\0') { errorMsg("improperly terminated string argument for %s", key); return 0; } else if (*q == '\\') switch (*++q) { case 'a': *r = '\a'; break; case 'b': *r = '\b'; break; case 'e': *r = '\033'; break; case 'f': *r = '\f'; break; case 'n': *r = '\n'; break; case 'r': *r = '\r'; break; case 't': *r = '\t'; break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': { int c = *q - '0'; if (q[1] >= '0' && q[1] <= '7') { c = (c * 8) + *++q - '0'; if (q[1] >= '0' && q[1] <= '7') c = (c * 8) + *++q - '0'; } *r = c; } break; default: *r = *q; break; } else *r = *q; } *r = '\0'; ++q; } else { char *r; /* In this case, the string is not quoted. We will break it using the coma (like for ints). If the user wants to include comas in a string, he just has to quote it */ /* Search the next coma */ r = strchr(q, ','); /* Found ? */ if (r != (char *) NULL) { /* Recopy the current field */ str = alloca(r - q + 1); memcpy(str, q, r - q); /* I don't know if it is usefull, as the previous case doesn't null terminate the string ??? */ str[r - q] = '\0'; /* Keep next fields */ q = r; } else { /* last string */ str = q; q = ""; } } if (*p == 's') { /* Normal string */ obj_string_patch(f, sym->secidx, loc - contents, str); loc += tgt_sizeof_char_p; } else { /* Array of chars (in fact, matrix !) */ unsigned long charssize; /* size of each member */ /* Get the size of each member */ /* Probably we should do that outside the loop ? */ if (!isdigit(*(p + 1))) { errorMsg("parameter type 'c' for %s must be followed by" " the maximum size", key); return 0; } charssize = strtoul(p + 1, (char **) NULL, 10); /* Check length */ if (strlen(str) >= charssize) { errorMsg("string too long for %s (max %ld)", key, charssize - 1); return 0; } /* Copy to location */ strcpy((char *) loc, str); loc += charssize; } } else { long v = strtoul(q, &q, 0); switch (*p) { case 'b': *loc++ = v; break; case 'h': *(short *) loc = v; loc += tgt_sizeof_short; break; case 'i': *(int *) loc = v; loc += tgt_sizeof_int; break; case 'l': *(long *) loc = v; loc += tgt_sizeof_long; break; default: errorMsg("unknown parameter type '%c' for %s", *p, key); return 0; } } retry_end_of_value: switch (*q) { case '\0': goto end_of_arg; case ' ': case '\t': case '\n': case '\r': ++q; goto retry_end_of_value; case ',': if (++n > max) { errorMsg("too many values for %s (max %d)", key, max); return 0; } ++q; break; default: errorMsg("invalid argument syntax for %s", key); return 0; } } end_of_arg: if (n < min) { errorMsg("too few values for %s (min %d)", key, min); return 0; } argc--, argv++; } return 1; } #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING static int new_is_module_checksummed(struct obj_file *f) { const char *p = get_modinfo_value(f, "using_checksums"); if (p) return atoi(p); else return 0; } /* Get the module's kernel version in the canonical integer form. */ static int new_get_module_version(struct obj_file *f, char str[STRVERSIONLEN]) { char *p, *q; int a, b, c; p = get_modinfo_value(f, "kernel_version"); if (p == NULL) return -1; strncpy(str, p, STRVERSIONLEN); a = strtoul(p, &p, 10); if (*p != '.') return -1; b = strtoul(p + 1, &p, 10); if (*p != '.') return -1; c = strtoul(p + 1, &q, 10); if (p + 1 == q) return -1; return a << 16 | b << 8 | c; } #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */ #ifdef BB_FEATURE_INSMOD_NEW_KERNEL /* Fetch the loaded modules, and all currently exported symbols. */ static int new_get_kernel_symbols(void) { char *module_names, *mn; struct external_module *modules, *m; struct new_module_symbol *syms, *s; size_t ret, bufsize, nmod, nsyms, i, j; /* Collect the loaded modules. */ module_names = xmalloc(bufsize = 256); retry_modules_load: if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) { if (errno == ENOSPC) { module_names = xrealloc(module_names, bufsize = ret); goto retry_modules_load; } errorMsg("QM_MODULES: %s", strerror(errno)); return 0; } n_ext_modules = nmod = ret; ext_modules = modules = xmalloc(nmod * sizeof(*modules)); memset(modules, 0, nmod * sizeof(*modules)); /* Collect the modules' symbols. */ for (i = 0, mn = module_names, m = modules; i < nmod; ++i, ++m, mn += strlen(mn) + 1) { struct new_module_info info; if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) { if (errno == ENOENT) { /* The module was removed out from underneath us. */ continue; } errorMsg("query_module: QM_INFO: %s: %s", mn, strerror(errno)); return 0; } syms = xmalloc(bufsize = 1024); retry_mod_sym_load: if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) { switch (errno) { case ENOSPC: syms = xrealloc(syms, bufsize = ret); goto retry_mod_sym_load; case ENOENT: /* The module was removed out from underneath us. */ continue; default: errorMsg("query_module: QM_SYMBOLS: %s: %s", mn, strerror(errno)); return 0; } } nsyms = ret; m->name = mn; m->addr = info.addr; m->nsyms = nsyms; m->syms = syms; for (j = 0, s = syms; j < nsyms; ++j, ++s) { s->name += (unsigned long) syms; } } /* Collect the kernel's symbols. */ syms = xmalloc(bufsize = 16 * 1024); retry_kern_sym_load: if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) { if (errno == ENOSPC) { syms = xrealloc(syms, bufsize = ret); goto retry_kern_sym_load; } errorMsg("kernel: QM_SYMBOLS: %s", strerror(errno)); return 0; } nksyms = nsyms = ret; ksyms = syms; for (j = 0, s = syms; j < nsyms; ++j, ++s) { s->name += (unsigned long) syms; } return 1; } /* Return the kernel symbol checksum version, or zero if not used. */ static int new_is_kernel_checksummed(void) { struct new_module_symbol *s; size_t i; /* Using_Versions is not the first symbol, but it should be in there. */ for (i = 0, s = ksyms; i < nksyms; ++i, ++s) if (strcmp((char *) s->name, "Using_Versions") == 0) return s->value; return 0; } static int new_create_this_module(struct obj_file *f, const char *m_name) { struct obj_section *sec; sec = obj_create_alloced_section_first(f, ".this", tgt_sizeof_long, sizeof(struct new_module)); memset(sec->contents, 0, sizeof(struct new_module)); obj_add_symbol(f, "__this_module", -1, ELFW(ST_INFO) (STB_LOCAL, STT_OBJECT), sec->idx, 0, sizeof(struct new_module)); obj_string_patch(f, sec->idx, offsetof(struct new_module, name), m_name); return 1; } static int new_create_module_ksymtab(struct obj_file *f) { struct obj_section *sec; int i; /* We must always add the module references. */ if (n_ext_modules_used) { struct new_module_ref *dep; struct obj_symbol *tm; sec = obj_create_alloced_section(f, ".kmodtab", tgt_sizeof_void_p, (sizeof(struct new_module_ref) * n_ext_modules_used)); if (!sec) return 0; tm = obj_find_symbol(f, "__this_module"); dep = (struct new_module_ref *) sec->contents; for (i = 0; i < n_ext_modules; ++i) if (ext_modules[i].used) { dep->dep = ext_modules[i].addr; obj_symbol_patch(f, sec->idx, (char *) &dep->ref - sec->contents, tm); dep->next_ref = 0; ++dep; } } if (flag_export && !obj_find_section(f, "__ksymtab")) { size_t nsyms; int *loaded; sec = obj_create_alloced_section(f, "__ksymtab", tgt_sizeof_void_p, 0); /* We don't want to export symbols residing in sections that aren't loaded. There are a number of these created so that we make sure certain module options don't appear twice. */ loaded = alloca(sizeof(int) * (i = f->header.e_shnum)); while (--i >= 0) loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0; for (nsyms = i = 0; i < HASH_BUCKETS; ++i) { struct obj_symbol *sym; for (sym = f->symtab[i]; sym; sym = sym->next) if (ELFW(ST_BIND) (sym->info) != STB_LOCAL && sym->secidx <= SHN_HIRESERVE && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])) { ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p; obj_symbol_patch(f, sec->idx, ofs, sym); obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p, sym->name); nsyms++; } } obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p); } return 1; } static int new_init_module(const char *m_name, struct obj_file *f, unsigned long m_size) { struct new_module *module; struct obj_section *sec; void *image; int ret; tgt_long m_addr; sec = obj_find_section(f, ".this"); module = (struct new_module *) sec->contents; m_addr = sec->header.sh_addr; module->size_of_struct = sizeof(*module); module->size = m_size; module->flags = flag_autoclean ? NEW_MOD_AUTOCLEAN : 0; sec = obj_find_section(f, "__ksymtab"); if (sec && sec->header.sh_size) { module->syms = sec->header.sh_addr; module->nsyms = sec->header.sh_size / (2 * tgt_sizeof_char_p); } if (n_ext_modules_used) { sec = obj_find_section(f, ".kmodtab"); module->deps = sec->header.sh_addr; module->ndeps = n_ext_modules_used; } module->init = obj_symbol_final_value(f, obj_find_symbol(f, "init_module")); module->cleanup = obj_symbol_final_value(f, obj_find_symbol(f, "cleanup_module")); sec = obj_find_section(f, "__ex_table"); if (sec) { module->ex_table_start = sec->header.sh_addr; module->ex_table_end = sec->header.sh_addr + sec->header.sh_size; } sec = obj_find_section(f, ".text.init"); if (sec) { module->runsize = sec->header.sh_addr - m_addr; } sec = obj_find_section(f, ".data.init"); if (sec) { if (!module->runsize || module->runsize > sec->header.sh_addr - m_addr) module->runsize = sec->header.sh_addr - m_addr; } if (!arch_init_module(f, module)) return 0; /* Whew! All of the initialization is complete. Collect the final module image and give it to the kernel. */ image = xmalloc(m_size); obj_create_image(f, image); ret = new_sys_init_module(m_name, (struct new_module *) image); if (ret) errorMsg("init_module: %s: %s", m_name, strerror(errno)); free(image); return ret == 0; } #else #define new_init_module(x, y, z) TRUE #define new_create_this_module(x, y) 0 #define new_create_module_ksymtab(x) #endif /* BB_FEATURE_INSMOD_OLD_KERNEL */ /*======================================================================*/ int obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, const char *string) { struct obj_string_patch *p; struct obj_section *strsec; size_t len = strlen(string) + 1; char *loc; p = xmalloc(sizeof(*p)); p->next = f->string_patches; p->reloc_secidx = secidx; p->reloc_offset = offset; f->string_patches = p; strsec = obj_find_section(f, ".kstrtab"); if (strsec == NULL) { strsec = obj_create_alloced_section(f, ".kstrtab", 1, len); p->string_offset = 0; loc = strsec->contents; } else { p->string_offset = strsec->header.sh_size; loc = obj_extend_section(strsec, len); } memcpy(loc, string, len); return 1; } int obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, struct obj_symbol *sym) { struct obj_symbol_patch *p; p = xmalloc(sizeof(*p)); p->next = f->symbol_patches; p->reloc_secidx = secidx; p->reloc_offset = offset; p->sym = sym; f->symbol_patches = p; return 1; } int obj_check_undefineds(struct obj_file *f) { unsigned long i; int ret = 1; for (i = 0; i < HASH_BUCKETS; ++i) { struct obj_symbol *sym; for (sym = f->symtab[i]; sym; sym = sym->next) if (sym->secidx == SHN_UNDEF) { if (ELFW(ST_BIND) (sym->info) == STB_WEAK) { sym->secidx = SHN_ABS; sym->value = 0; } else { errorMsg("unresolved symbol %s", sym->name); ret = 0; } } } return ret; } void obj_allocate_commons(struct obj_file *f) { struct common_entry { struct common_entry *next; struct obj_symbol *sym; } *common_head = NULL; unsigned long i; for (i = 0; i < HASH_BUCKETS; ++i) { struct obj_symbol *sym; for (sym = f->symtab[i]; sym; sym = sym->next) if (sym->secidx == SHN_COMMON) { /* Collect all COMMON symbols and sort them by size so as to minimize space wasted by alignment requirements. */ { struct common_entry **p, *n; for (p = &common_head; *p; p = &(*p)->next) if (sym->size <= (*p)->sym->size) break; n = alloca(sizeof(*n)); n->next = *p; n->sym = sym; *p = n; } } } for (i = 1; i < f->local_symtab_size; ++i) { struct obj_symbol *sym = f->local_symtab[i]; if (sym && sym->secidx == SHN_COMMON) { struct common_entry **p, *n; for (p = &common_head; *p; p = &(*p)->next) if (sym == (*p)->sym) break; else if (sym->size < (*p)->sym->size) { n = alloca(sizeof(*n)); n->next = *p; n->sym = sym; *p = n; break; } } } if (common_head) { /* Find the bss section. */ for (i = 0; i < f->header.e_shnum; ++i) if (f->sections[i]->header.sh_type == SHT_NOBITS) break; /* If for some reason there hadn't been one, create one. */ if (i == f->header.e_shnum) { struct obj_section *sec; f->sections = xrealloc(f->sections, (i + 1) * sizeof(sec)); f->sections[i] = sec = arch_new_section(); f->header.e_shnum = i + 1; memset(sec, 0, sizeof(*sec)); sec->header.sh_type = SHT_PROGBITS; sec->header.sh_flags = SHF_WRITE | SHF_ALLOC; sec->name = ".bss"; sec->idx = i; } /* Allocate the COMMONS. */ { ElfW(Addr) bss_size = f->sections[i]->header.sh_size; ElfW(Addr) max_align = f->sections[i]->header.sh_addralign; struct common_entry *c; for (c = common_head; c; c = c->next) { ElfW(Addr) align = c->sym->value; if (align > max_align) max_align = align; if (bss_size & (align - 1)) bss_size = (bss_size | (align - 1)) + 1; c->sym->secidx = i; c->sym->value = bss_size; bss_size += c->sym->size; } f->sections[i]->header.sh_size = bss_size; f->sections[i]->header.sh_addralign = max_align; } } /* For the sake of patch relocation and parameter initialization, allocate zeroed data for NOBITS sections now. Note that after this we cannot assume NOBITS are really empty. */ for (i = 0; i < f->header.e_shnum; ++i) { struct obj_section *s = f->sections[i]; if (s->header.sh_type == SHT_NOBITS) { s->contents = memset(xmalloc(s->header.sh_size), 0, s->header.sh_size); s->header.sh_type = SHT_PROGBITS; } } } unsigned long obj_load_size(struct obj_file *f) { unsigned long dot = 0; struct obj_section *sec; /* Finalize the positions of the sections relative to one another. */ for (sec = f->load_order; sec; sec = sec->load_next) { ElfW(Addr) align; align = sec->header.sh_addralign; if (align && (dot & (align - 1))) dot = (dot | (align - 1)) + 1; sec->header.sh_addr = dot; dot += sec->header.sh_size; } return dot; } int obj_relocate(struct obj_file *f, ElfW(Addr) base) { int i, n = f->header.e_shnum; int ret = 1; /* Finalize the addresses of the sections. */ f->baseaddr = base; for (i = 0; i < n; ++i) f->sections[i]->header.sh_addr += base; /* And iterate over all of the relocations. */ for (i = 0; i < n; ++i) { struct obj_section *relsec, *symsec, *targsec, *strsec; ElfW(RelM) * rel, *relend; ElfW(Sym) * symtab; const char *strtab; relsec = f->sections[i]; if (relsec->header.sh_type != SHT_RELM) continue; symsec = f->sections[relsec->header.sh_link]; targsec = f->sections[relsec->header.sh_info]; strsec = f->sections[symsec->header.sh_link]; rel = (ElfW(RelM) *) relsec->contents; relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM))); symtab = (ElfW(Sym) *) symsec->contents; strtab = (const char *) strsec->contents; for (; rel < relend; ++rel) { ElfW(Addr) value = 0; struct obj_symbol *intsym = NULL; unsigned long symndx; ElfW(Sym) * extsym = 0; const char *errmsg; /* Attempt to find a value to use for this relocation. */ symndx = ELFW(R_SYM) (rel->r_info); if (symndx) { /* Note we've already checked for undefined symbols. */ extsym = &symtab[symndx]; if (ELFW(ST_BIND) (extsym->st_info) == STB_LOCAL) { /* Local symbols we look up in the local table to be sure we get the one that is really intended. */ intsym = f->local_symtab[symndx]; } else { /* Others we look up in the hash table. */ const char *name; if (extsym->st_name) name = strtab + extsym->st_name; else name = f->sections[extsym->st_shndx]->name; intsym = obj_find_symbol(f, name); } value = obj_symbol_final_value(f, intsym); intsym->referenced = 1; } #if SHT_RELM == SHT_RELA #if defined(__alpha__) && defined(AXP_BROKEN_GAS) /* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */ if (!extsym || !extsym->st_name || ELFW(ST_BIND) (extsym->st_info) != STB_LOCAL) #endif value += rel->r_addend; #endif /* Do it! */ switch (arch_apply_relocation (f, targsec, symsec, intsym, rel, value)) { case obj_reloc_ok: break; case obj_reloc_overflow: errmsg = "Relocation overflow"; goto bad_reloc; case obj_reloc_dangerous: errmsg = "Dangerous relocation"; goto bad_reloc; case obj_reloc_unhandled: errmsg = "Unhandled relocation"; bad_reloc: if (extsym) { errorMsg("%s of type %ld for %s", errmsg, (long) ELFW(R_TYPE) (rel->r_info), strtab + extsym->st_name); } else { errorMsg("%s of type %ld", errmsg, (long) ELFW(R_TYPE) (rel->r_info)); } ret = 0; break; } } } /* Finally, take care of the patches. */ if (f->string_patches) { struct obj_string_patch *p; struct obj_section *strsec; ElfW(Addr) strsec_base; strsec = obj_find_section(f, ".kstrtab"); strsec_base = strsec->header.sh_addr; for (p = f->string_patches; p; p = p->next) { struct obj_section *targsec = f->sections[p->reloc_secidx]; *(ElfW(Addr) *) (targsec->contents + p->reloc_offset) = strsec_base + p->string_offset; } } if (f->symbol_patches) { struct obj_symbol_patch *p; for (p = f->symbol_patches; p; p = p->next) { struct obj_section *targsec = f->sections[p->reloc_secidx]; *(ElfW(Addr) *) (targsec->contents + p->reloc_offset) = obj_symbol_final_value(f, p->sym); } } return ret; } int obj_create_image(struct obj_file *f, char *image) { struct obj_section *sec; ElfW(Addr) base = f->baseaddr; for (sec = f->load_order; sec; sec = sec->load_next) { char *secimg; if (sec->header.sh_size == 0) continue; secimg = image + (sec->header.sh_addr - base); /* Note that we allocated data for NOBITS sections earlier. */ memcpy(secimg, sec->contents, sec->header.sh_size); } return 1; } /*======================================================================*/ struct obj_file *obj_load(FILE * fp) { struct obj_file *f; ElfW(Shdr) * section_headers; int shnum, i; char *shstrtab; /* Read the file header. */ f = arch_new_file(); memset(f, 0, sizeof(*f)); f->symbol_cmp = strcmp; f->symbol_hash = obj_elf_hash; f->load_order_search_start = &f->load_order; fseek(fp, 0, SEEK_SET); if (fread(&f->header, sizeof(f->header), 1, fp) != 1) { errorMsg("error reading ELF header: %s", strerror(errno)); return NULL; } if (f->header.e_ident[EI_MAG0] != ELFMAG0 || f->header.e_ident[EI_MAG1] != ELFMAG1 || f->header.e_ident[EI_MAG2] != ELFMAG2 || f->header.e_ident[EI_MAG3] != ELFMAG3) { errorMsg("not an ELF file"); return NULL; } if (f->header.e_ident[EI_CLASS] != ELFCLASSM || f->header.e_ident[EI_DATA] != ELFDATAM || f->header.e_ident[EI_VERSION] != EV_CURRENT || !MATCH_MACHINE(f->header.e_machine)) { errorMsg("ELF file not for this architecture"); return NULL; } if (f->header.e_type != ET_REL) { errorMsg("ELF file not a relocatable object"); return NULL; } /* Read the section headers. */ if (f->header.e_shentsize != sizeof(ElfW(Shdr))) { errorMsg("section header size mismatch: %lu != %lu", (unsigned long) f->header.e_shentsize, (unsigned long) sizeof(ElfW(Shdr))); return NULL; } shnum = f->header.e_shnum; f->sections = xmalloc(sizeof(struct obj_section *) * shnum); memset(f->sections, 0, sizeof(struct obj_section *) * shnum); section_headers = alloca(sizeof(ElfW(Shdr)) * shnum); fseek(fp, f->header.e_shoff, SEEK_SET); if (fread(section_headers, sizeof(ElfW(Shdr)), shnum, fp) != shnum) { errorMsg("error reading ELF section headers: %s", strerror(errno)); return NULL; } /* Read the section data. */ for (i = 0; i < shnum; ++i) { struct obj_section *sec; f->sections[i] = sec = arch_new_section(); memset(sec, 0, sizeof(*sec)); sec->header = section_headers[i]; sec->idx = i; switch (sec->header.sh_type) { case SHT_NULL: case SHT_NOTE: case SHT_NOBITS: /* ignore */ break; case SHT_PROGBITS: case SHT_SYMTAB: case SHT_STRTAB: case SHT_RELM: if (sec->header.sh_size > 0) { sec->contents = xmalloc(sec->header.sh_size); fseek(fp, sec->header.sh_offset, SEEK_SET); if (fread(sec->contents, sec->header.sh_size, 1, fp) != 1) { errorMsg("error reading ELF section data: %s", strerror(errno)); return NULL; } } else { sec->contents = NULL; } break; #if SHT_RELM == SHT_REL case SHT_RELA: errorMsg("RELA relocations not supported on this architecture"); return NULL; #else case SHT_REL: errorMsg("REL relocations not supported on this architecture"); return NULL; #endif default: if (sec->header.sh_type >= SHT_LOPROC) { /* Assume processor specific section types are debug info and can safely be ignored. If this is ever not the case (Hello MIPS?), don't put ifdefs here but create an arch_load_proc_section(). */ break; } errorMsg("can't handle sections of type %ld", (long) sec->header.sh_type); return NULL; } } /* Do what sort of interpretation as needed by each section. */ shstrtab = f->sections[f->header.e_shstrndx]->contents; for (i = 0; i < shnum; ++i) { struct obj_section *sec = f->sections[i]; sec->name = shstrtab + sec->header.sh_name; } for (i = 0; i < shnum; ++i) { struct obj_section *sec = f->sections[i]; if (sec->header.sh_flags & SHF_ALLOC) obj_insert_section_load_order(f, sec); switch (sec->header.sh_type) { case SHT_SYMTAB: { unsigned long nsym, j; char *strtab; ElfW(Sym) * sym; if (sec->header.sh_entsize != sizeof(ElfW(Sym))) { errorMsg("symbol size mismatch: %lu != %lu", (unsigned long) sec->header.sh_entsize, (unsigned long) sizeof(ElfW(Sym))); return NULL; } nsym = sec->header.sh_size / sizeof(ElfW(Sym)); strtab = f->sections[sec->header.sh_link]->contents; sym = (ElfW(Sym) *) sec->contents; /* Allocate space for a table of local symbols. */ j = f->local_symtab_size = sec->header.sh_info; f->local_symtab = xmalloc(j *= sizeof(struct obj_symbol *)); memset(f->local_symtab, 0, j); /* Insert all symbols into the hash table. */ for (j = 1, ++sym; j < nsym; ++j, ++sym) { const char *name; if (sym->st_name) name = strtab + sym->st_name; else name = f->sections[sym->st_shndx]->name; obj_add_symbol(f, name, j, sym->st_info, sym->st_shndx, sym->st_value, sym->st_size); } } break; case SHT_RELM: if (sec->header.sh_entsize != sizeof(ElfW(RelM))) { errorMsg("relocation entry size mismatch: %lu != %lu", (unsigned long) sec->header.sh_entsize, (unsigned long) sizeof(ElfW(RelM))); return NULL; } break; } } return f; } static void hide_special_symbols(struct obj_file *f) { static const char *const specials[] = { "cleanup_module", "init_module", "kernel_version", NULL }; struct obj_symbol *sym; const char *const *p; for (p = specials; *p; ++p) if ((sym = obj_find_symbol(f, *p)) != NULL) sym->info = ELFW(ST_INFO) (STB_LOCAL, ELFW(ST_TYPE) (sym->info)); } void my_usage(void) { printf("Usage."); exit(0); } extern int insmod_main( int argc, char **argv) { int k_crcs; int k_new_syscalls; int len; char *tmp; unsigned long m_size; ElfW(Addr) m_addr; FILE *fp; struct obj_file *f; char m_name[BUFSIZ + 1] = "\0"; int exit_status = FALSE; int m_has_modinfo; #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING int k_version; char k_strversion[STRVERSIONLEN]; char m_strversion[STRVERSIONLEN]; int m_version; int m_crcs; #endif if (argc <= 1) my_usage(); argv++; argc--; /* Grab the module name */ if ((tmp = strrchr(*argv, '/')) != NULL) { tmp++; } else { tmp = *argv; } len = strlen(tmp); if (len > 2 && tmp[len - 2] == '.' && tmp[len - 1] == 'o') len -= 2; memcpy(m_name, tmp, len); strcpy(m_fullName, m_name); strcat(m_fullName, ".o"); /* Get a filedesc for the module */ if ((fp = fopen(*argv, "r")) == NULL) { errorMsg("Module %s not found", *argv); return -1; } else memcpy(m_filename, *argv, strlen(*argv)); if ((f = obj_load(fp)) == NULL) { logperror("Could not load the module"); goto out; } if (get_modinfo_value(f, "kernel_version") == NULL) m_has_modinfo = 0; else m_has_modinfo = 1; #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING /* Version correspondence? */ k_version = get_kernel_version(k_strversion); if (m_has_modinfo) { m_version = new_get_module_version(f, m_strversion); } else { m_version = old_get_module_version(f, m_strversion); if (m_version == -1) { errorMsg("couldn't find the kernel version the module was " "compiled for"); goto out; } } if (strncmp(k_strversion, m_strversion, STRVERSIONLEN) != 0) { if (flag_force_load) { errorMsg("Warning: kernel-module version mismatch\n" "\t%s was compiled for kernel version %s\n" "\twhile this kernel is version %s", m_filename, m_strversion, k_strversion); } else { errorMsg("kernel-module version mismatch\n" "\t%s was compiled for kernel version %s\n" "\twhile this kernel is version %s.", m_filename, m_strversion, k_strversion); goto out; } } k_crcs = 0; #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */ k_new_syscalls = !query_module(NULL, 0, NULL, 0, NULL); if (k_new_syscalls) { #ifdef BB_FEATURE_INSMOD_NEW_KERNEL if (!new_get_kernel_symbols()) goto out; k_crcs = new_is_kernel_checksummed(); #else errorMsg("Not configured to support new kernels"); goto out; #endif } else { #ifdef BB_FEATURE_INSMOD_OLD_KERNEL if (!old_get_kernel_symbols(m_name)) goto out; k_crcs = old_is_kernel_checksummed(); #else errorMsg("Not configured to support old kernels"); goto out; #endif } #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING if (m_has_modinfo) m_crcs = new_is_module_checksummed(f); else m_crcs = old_is_module_checksummed(f); if (m_crcs != k_crcs) obj_set_symbol_compare(f, ncv_strcmp, ncv_symbol_hash); #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */ /* Let the module know about the kernel symbols. */ add_kernel_symbols(f); /* Allocate common symbols, symbol tables, and string tables. */ if (k_new_syscalls ? !new_create_this_module(f, m_name) : !old_create_mod_use_count(f)) { goto out; } if (!obj_check_undefineds(f)) { goto out; } obj_allocate_commons(f); if (m_has_modinfo ? !new_process_module_arguments(f, argc-1, argv+1) : !old_process_module_arguments(f, argc-1, argv+1)) { goto out; } arch_create_got(f); hide_special_symbols(f); if (k_new_syscalls) new_create_module_ksymtab(f); /* Find current size of the module */ m_size = obj_load_size(f); errno = 0; m_addr = create_module(m_name, m_size); switch (errno) { case 0: break; case EEXIST: errorMsg("A module named %s already exists", m_name); /* Considered as a success in stage1 */ fclose(fp); return(TRUE); case ENOMEM: errorMsg("Can't allocate kernel memory for module; needed %lu bytes", m_size); goto out; default: errorMsg("create_module: %s: %s", m_name, strerror(errno)); goto out; } if (!obj_relocate(f, m_addr)) { delete_module(m_name); goto out; } if (k_new_syscalls ? !new_init_module(m_name, f, m_size) : !old_init_module(m_name, f, m_size)) { delete_module(m_name); goto out; } exit_status = TRUE; out: fclose(fp); return(exit_status); } int insmod_call(char * full_filename, char * params) { int argc = 2; char *argv[50]; char * ptr = params; argv[0] = "stage1"; argv[1] = full_filename; while (ptr != NULL) { argv[argc] = ptr; argc++; ptr = strchr(ptr, ' '); if (ptr) { ptr[0] = '\0'; ptr++; } } return insmod_main(argc, argv); }