diff options
| -rw-r--r-- | kernel/module.c | 77 |
1 files changed, 43 insertions, 34 deletions
diff --git a/kernel/module.c b/kernel/module.c index 3ed4aaa646dc..0ad0bb58e116 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2488,7 +2488,11 @@ static char *get_modinfo(struct load_info *info, const char *tag) Elf_Shdr *infosec = &info->sechdrs[info->index.info]; unsigned long size = infosec->sh_size; - for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { + /* + * get_modinfo() calls made before rewrite_section_headers() + * must use sh_offset, as sh_addr isn't set! + */ + for (p = (char *)info->hdr + infosec->sh_offset; p; p = next_string(p, &size)) { if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') return p + taglen + 1; } @@ -2928,17 +2932,7 @@ static int rewrite_section_headers(struct load_info *info, int flags) } /* Track but don't keep modinfo and version sections. */ - if (flags & MODULE_INIT_IGNORE_MODVERSIONS) - info->index.vers = 0; /* Pretend no __versions section! */ - else - info->index.vers = find_sec(info, "__versions"); info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; - - info->index.info = find_sec(info, ".modinfo"); - if (!info->index.info) - info->name = "(missing .modinfo section)"; - else - info->name = get_modinfo(info, "name"); info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; return 0; @@ -2955,16 +2949,18 @@ static int rewrite_section_headers(struct load_info *info, int flags) static int setup_load_info(struct load_info *info, int flags) { unsigned int i; - int err; /* Set up the convenience variables */ info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; info->secstrings = (void *)info->hdr + info->sechdrs[info->hdr->e_shstrndx].sh_offset; - err = rewrite_section_headers(info, flags); - if (err) - return err; + /* Try to find a name early so we can log errors with a module name */ + info->index.info = find_sec(info, ".modinfo"); + if (!info->index.info) + info->name = "(missing .modinfo section)"; + else + info->name = get_modinfo(info, "name"); /* Find internal symbols and strings. */ for (i = 1; i < info->hdr->e_shnum; i++) { @@ -2977,6 +2973,11 @@ static int setup_load_info(struct load_info *info, int flags) } } + if (info->index.sym == 0) { + pr_warn("%s: module has no symbols (stripped?)\n", info->name); + return -ENOEXEC; + } + info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); if (!info->index.mod) { pr_warn("%s: No module found in object\n", @@ -2984,26 +2985,22 @@ static int setup_load_info(struct load_info *info, int flags) return -ENOEXEC; } /* This is temporary: point mod into copy of data. */ - info->mod = (void *)info->sechdrs[info->index.mod].sh_addr; + info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; /* - * If we didn't load the .modinfo 'name' field, fall back to + * If we didn't load the .modinfo 'name' field earlier, fall back to * on-disk struct mod 'name' field. */ if (!info->name) info->name = info->mod->name; - if (info->index.sym == 0) { - pr_warn("%s: module has no symbols (stripped?)\n", info->name); - return -ENOEXEC; - } + if (flags & MODULE_INIT_IGNORE_MODVERSIONS) + info->index.vers = 0; /* Pretend no __versions section! */ + else + info->index.vers = find_sec(info, "__versions"); info->index.pcpu = find_pcpusec(info); - /* Check module struct version now, before we try to use module. */ - if (!check_modstruct_version(info, info->mod)) - return -ENOEXEC; - return 0; } @@ -3303,13 +3300,6 @@ static struct module *layout_and_allocate(struct load_info *info, int flags) unsigned int ndx; int err; - err = setup_load_info(info, flags); - if (err) - return ERR_PTR(err); - - if (blacklisted(info->name)) - return ERR_PTR(-EPERM); - err = check_modinfo(info->mod, info, flags); if (err) return ERR_PTR(err); @@ -3657,17 +3647,36 @@ static int load_module(struct load_info *info, const char __user *uargs, int flags) { struct module *mod; - long err; + long err = 0; char *after_dashes; + err = elf_header_check(info); + if (err) + goto free_copy; + + err = setup_load_info(info, flags); + if (err) + goto free_copy; + + if (blacklisted(info->name)) { + err = -EPERM; + goto free_copy; + } + err = module_sig_check(info, flags); if (err) goto free_copy; - err = elf_header_check(info); + err = rewrite_section_headers(info, flags); if (err) goto free_copy; + /* Check module struct version now, before we try to use module. */ + if (!check_modstruct_version(info, info->mod)) { + err = -ENOEXEC; + goto free_copy; + } + /* Figure out module layout, and allocate all the memory. */ mod = layout_and_allocate(info, flags); if (IS_ERR(mod)) { |