diff options
Diffstat (limited to 'modutils')
| -rw-r--r-- | modutils/insmod.c | 2758 |
1 files changed, 2712 insertions, 46 deletions
diff --git a/modutils/insmod.c b/modutils/insmod.c index 9d473ca4a..dfea51832 100644 --- a/modutils/insmod.c +++ b/modutils/insmod.c @@ -3,7 +3,15 @@ * Mini insmod implementation for busybox * * Copyright (C) 1999,2000 by Lineo, inc. - * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> + * Written by Erik Andersen <andersen@lineo.com> + * and Ron Alder <alder@lineo.com> + * + * Based almost entirely on the Linux modutils-2.3.11 implementation. + * Copyright 1996, 1997 Linux International. + * New implementation contributed by Richard Henderson <rth@tamu.edu> + * Based on original work by Bjorn Ekwall <bj0rn@blox.se> + * Restructured (and partly rewritten) by: + * Björn Ekwall <bj0rn@blox.se> 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 @@ -24,25 +32,503 @@ #include "internal.h" #include <stdlib.h> #include <stdio.h> +#include <stddef.h> #include <errno.h> #include <unistd.h> #include <dirent.h> +#include <ctype.h> +#include <assert.h> +#include <sys/utsname.h> #include <sys/syscall.h> -#include <linux/module.h> + +//---------------------------------------------------------------------------- +//--------modutils module.h, lines 45-242 +//---------------------------------------------------------------------------- + +/* Definitions for the Linux module syscall interface. + Copyright 1996, 1997 Linux International. + + Contributed by Richard Henderson <rth@tamu.edu> + + 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: insmod.c,v 1.8 2000/06/12 23:11:16 andersen Exp $" + +/* 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 <rth@tamu.edu> + + 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: insmod.c,v 1.8 2000/06/12 23:11:16 andersen Exp $" + +/* The relocatable object is manipulated using elfin types. */ + +#include <stdio.h> +#include <elf.h> + + +/* Machine-specific elf macros for i386 et al. */ + +#define ELFCLASSM ELFCLASS32 +#define ELFDATAM ELFDATA2LSB + +#define MATCH_MACHINE(x) (x == EM_386 || x == EM_486) + +#define SHT_RELM SHT_REL +#define Elf32_RelM Elf32_Rel + + +#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 = 0; +int flag_autoclean = 0; +int flag_verbose = 0; +int flag_export = 1; + + +/*======================================================================*/ + +struct i386_got_entry { + int offset; + unsigned offset_done:1; + unsigned reloc_done:1; +}; + +struct i386_file { + struct obj_file root; + struct obj_section *got; +}; + +struct i386_symbol { + struct obj_symbol root; + struct i386_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; -#warning "Danger Will Robinson, Danger!!!" -#warning " " -#warning "insmod is still under construction. Don't use it." -#warning " " -#warning " You have been warned!" -#warning " " /* Some firendly syscalls to cheer everyone's day... */ -_syscall2(int, init_module, const char *, name, - const struct module *, info) +#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 @@ -74,16 +560,32 @@ static const char insmod_usage[] = #ifndef BB_FEATURE_TRIVIAL_HELP "\nLoads the specified kernel modules into the kernel.\n\n" "Options:\n" - "\t-f\tForce module to load into the wrong kernel version.\n" "\t-k\tMake module autoclean-able.\n" + "\t-v\tverbose output\n" "\t-x\tdo not export externs\n" #endif - ; +; + +/*======================================================================*/ + +void *xrealloc(void *old, size_t size) +{ + void *ptr = realloc(old, size); + if (!ptr) { + perror("Out of memory"); + exit(1); + } + return ptr; +} -static int findNamedModule(const char *fileName, struct stat *statbuf) +static int findNamedModule(const char *fileName, struct stat *statbuf, + void *userDate) { - if (m_fullName[0] == '\0') + char *fullName = (char *) userDate; + + + if (fullName[0] == '\0') return (FALSE); else { char *tmp = strrchr(fileName, '/'); @@ -92,7 +594,7 @@ static int findNamedModule(const char *fileName, struct stat *statbuf) tmp = (char *) fileName; else tmp++; - if (check_wildcard_match(tmp, m_fullName) == TRUE) { + if (check_wildcard_match(tmp, fullName) == TRUE) { /* Stop searching if we find a match */ memcpy(m_filename, fileName, strlen(fileName)); return (FALSE); @@ -102,12 +604,2070 @@ static int findNamedModule(const char *fileName, struct stat *statbuf) } -extern int insmod_main(int argc, char **argv) +/*======================================================================*/ + +struct obj_file *arch_new_file(void) { + struct i386_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 i386_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, + Elf32_Rel * rel, Elf32_Addr v) +{ + struct i386_file *ifile = (struct i386_file *) f; + struct i386_symbol *isym = (struct i386_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)) { + case R_386_NONE: + break; + + case R_386_32: + *loc += v; + break; + + case R_386_PLT32: + case R_386_PC32: + *loc += v - dot; + break; + + case R_386_GLOB_DAT: + case R_386_JMP_SLOT: + *loc = v; + break; + + case R_386_RELATIVE: + *loc += f->baseaddr; + break; + + case R_386_GOTPC: + assert(got != 0); + *loc += got - dot; + break; + + 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; + + case R_386_GOTOFF: + assert(got != 0); + *loc += v - got; + break; + + default: + ret = obj_reloc_unhandled; + break; + } + + return ret; +} + +int arch_create_got(struct obj_file *f) +{ + struct i386_file *ifile = (struct i386_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; + Elf32_Rel *rel, *relend; + 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]; + + rel = (Elf32_Rel *) relsec->contents; + relend = rel + (relsec->header.sh_size / sizeof(Elf32_Rel)); + symtab = (Elf32_Sym *) symsec->contents; + strtab = (const char *) strsec->contents; + + for (; rel < relend; ++rel) { + Elf32_Sym *extsym; + struct i386_symbol *intsym; + const char *name; + + switch (ELF32_R_TYPE(rel->r_info)) { + case R_386_GOTPC: + case R_386_GOTOFF: + gotneeded = 1; + default: + continue; + + case R_386_GOT32: + 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 i386_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) + fprintf(stderr, "%s multiply defined\n", 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; + size_t 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 (v - p == klen && strncmp(p, key, klen) == 0) + return v + 1; + } else { + if (n - p == klen && 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) + 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) { + fprintf(stderr, "symbol for parameter %s not found\n", 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') { + fprintf(stderr, + "improperly terminated string argument for %s\n", + 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(void) +{ + 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) { + perror("get_kernel_syms: %m"); + return 0; + } + + ks = k = xmalloc(nks * sizeof(*ks)); + + if (get_kernel_syms(ks) != nks) { + perror("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) + perror("init_module: %m"); + + 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) + 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) { + fprintf(stderr, "invalid parameter %s\n", 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) { + fprintf(stderr, "symbol for parameter %s not found\n", 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') { + fprintf(stderr, + "improperly terminated string argument for %s\n", + 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 !) */ + long charssize; /* size of each member */ + + /* Get the size of each member */ + /* Probably we should do that outside the loop ? */ + if (!isdigit(*(p + 1))) { + fprintf(stderr, + "parameter type 'c' for %s must be followed by" + " the maximum size\n", key); + return 0; + } + charssize = strtoul(p + 1, (char **) NULL, 10); + + /* Check length */ + if (strlen(str) >= charssize) { + fprintf(stderr, + "string too long for %s (max %ld)\n", 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: + fprintf(stderr, "unknown parameter type '%c' for %s\n", + *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) { + fprintf(stderr, "too many values for %s (max %d)\n", + key, max); + return 0; + } + ++q; + break; + + default: + fprintf(stderr, "invalid argument syntax for %s\n", key); + return 0; + } + } + + end_of_arg: + if (n < min) { + fprintf(stderr, "too few values for %s (min %d)\n", 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; + } + perror("QM_MODULES: %m\n"); + 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; + } + perror("query_module: QM_INFO: %m"); + 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: + perror("query_module: QM_SYMBOLS: %m"); + 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; + } + perror("kernel: QM_SYMBOLS: %m"); + 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) + perror("init_module: %m"); + + 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 { + fprintf(stderr, "unresolved symbol %s\n", 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) { + fprintf(stderr, "%s of type %ld for %s\n", errmsg, + (long) ELFW(R_TYPE) (rel->r_info), + strtab + extsym->st_name); + } else { + fprintf(stderr, "%s of type %ld\n", 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) { + perror("error reading ELF header: %m"); + 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) { + fprintf(stderr, "not an ELF file\n"); + 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)) { + fprintf(stderr, "ELF file not for this architecture\n"); + return NULL; + } + if (f->header.e_type != ET_REL) { + fprintf(stderr, "ELF file not a relocatable object\n"); + return NULL; + } + + /* Read the section headers. */ + + if (f->header.e_shentsize != sizeof(ElfW(Shdr))) { + fprintf(stderr, "section header size mismatch: %lu != %lu\n", + (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) { + perror("error reading ELF section headers: %m"); + 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) { + fprintf(stderr, + "error reading ELF section data: %m\n"); + return NULL; + } + } else { + sec->contents = NULL; + } + break; + +#if SHT_RELM == SHT_REL + case SHT_RELA: + fprintf(stderr, + "RELA relocations not supported on this architecture\n"); + return NULL; +#else + case SHT_REL: + fprintf(stderr, + "REL relocations not supported on this architecture\n"); + 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; + } + + fprintf(stderr, "can't handle sections of type %ld\n", + (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))) { + fprintf(stderr, "symbol size mismatch: %lu != %lu\n", + (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))) { + fprintf(stderr, + "relocation entry size mismatch: %lu != %lu\n", + (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)); +} + + + +extern int insmod_main( int argc, char **argv) +{ + int k_crcs; + int k_new_syscalls; int len; char *tmp; - char m_name[BUFSIZ + 1] = "\0"; + 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) { usage(insmod_usage); @@ -117,9 +2677,17 @@ extern int insmod_main(int argc, char **argv) while (--argc > 0 && **(++argv) == '-') { while (*(++(*argv))) { switch (**argv) { - case 'f': + case 'f': /* force loading */ + flag_force_load = 1; + break; + case 'k': /* module loaded by kerneld, auto-cleanable */ + flag_autoclean = 1; break; - case 'k': + case 'v': /* verbose output */ + flag_verbose = 1; + break; + case 'x': /* do not export externs */ + flag_export = 0; break; default: usage(insmod_usage); @@ -127,14 +2695,15 @@ extern int insmod_main(int argc, char **argv) } } - if (argc <= 0) + if (argc <= 0) { usage(insmod_usage); - + } /* Grab the module name */ - if ((tmp = strrchr(*argv, '/')) != NULL) + if ((tmp = strrchr(*argv, '/')) != NULL) { tmp++; - else + } else { tmp = *argv; + } len = strlen(tmp); if (len > 2 && tmp[len - 2] == '.' && tmp[len - 1] == 'o') @@ -147,9 +2716,11 @@ extern int insmod_main(int argc, char **argv) if ((fp = fopen(*argv, "r")) == NULL) { /* Hmpf. Could not open it. Search through _PATH_MODULES to find a module named m_name */ if (recursiveAction(_PATH_MODULES, TRUE, FALSE, FALSE, - findNamedModule, findNamedModule) == FALSE) { + findNamedModule, 0, m_fullName) == TRUE) + { if (m_filename[0] == '\0' - || ((fp = fopen(m_filename, "r")) == NULL)) { + || ((fp = fopen(m_filename, "r")) == NULL)) + { perror("No module by that name found in " _PATH_MODULES "\n"); exit(FALSE); @@ -159,40 +2730,112 @@ extern int insmod_main(int argc, char **argv) memcpy(m_filename, *argv, strlen(*argv)); - fprintf(stderr, "m_filename='%s'\n", m_filename); - fprintf(stderr, "m_name='%s'\n", m_name); - - - /* TODO: do something roughtly like this... */ -#if 0 - if ((f = obj_load(fp)) == NULL) { perror("Could not load the module\n"); exit(FALSE); } + 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) { + fprintf(stderr, + "couldn't find the kernel version the module was compiled for\n"); + goto out; + } + } + + if (strncmp(k_strversion, m_strversion, STRVERSIONLEN) != 0) { + if (flag_force_load) { + fprintf(stderr, "Warning: kernel-module version mismatch\n" + "\t%s was compiled for kernel version %s\n" + "\twhile this kernel is version %s\n", + m_filename, m_strversion, k_strversion); + } else { + fprintf(stderr, "kernel-module version mismatch\n" + "\t%s was compiled for kernel version %s\n" + "\twhile this kernel is version %s.\n", + 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 + fprintf(stderr, "Not configured to support new kernels\n"); + goto out; +#endif + } else { +#ifdef BB_FEATURE_INSMOD_OLD_KERNEL + if (!old_get_kernel_symbols()) + goto out; + k_crcs = old_is_kernel_checksummed(); +#else + fprintf(stderr, "Not configured to support old kernels\n"); + 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); - if (!create_this_module(f, m_name)) { - perror("Could not create the module\n"); - exit(FALSE); + /* 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, quiet)) { - perror("Undefined symbols in the module\n"); - exit(FALSE); + if (!obj_check_undefineds(f)) { + goto out; } obj_allocate_commons(f); - /* Perse the module's arguments */ - while (argc-- > 0 && *(argv++) != '\0') { - if (!process_module_arguments(f, argc - optind, argv + optind)) { - perror("Undefined symbols in the module\n"); - exit(FALSE); + if (optind < argc) { + if (m_has_modinfo + ? !new_process_module_arguments(f, argc - optind, argv + optind) + : !old_process_module_arguments(f, argc - optind, argv + optind)) + { + 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); @@ -200,14 +2843,37 @@ extern int insmod_main(int argc, char **argv) errno = 0; m_addr = create_module(m_name, m_size); switch (errno) { - /* yada yada */ + case 0: + break; + case EEXIST: + fprintf(stderr, "A module named %s already exists\n", m_name); + goto out; + case ENOMEM: + fprintf(stderr, + "Can't allocate kernel memory for module; needed %lu bytes\n", + m_size); + goto out; default: perror("create_module: %m"); + goto out; + } + if (!obj_relocate(f, m_addr)) { + delete_module(m_name); + goto out; } -#endif + 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); - exit(TRUE); + exit(exit_status); } |