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author | Andreas Robinson <andr345@gmail.com> | 2009-05-21 22:10:38 +0200 |
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committer | Andreas Robinson <andr345@gmail.com> | 2009-05-21 22:10:38 +0200 |
commit | 528db92ab1dd0d75dba415b9f3dc81f5a34773ce (patch) | |
tree | 9b68dc215488a079a8225759d9ce6c769b91592d | |
parent | 32971d375158804b34113d1359c9b726e1807f03 (diff) | |
download | module-init-tools-528db92ab1dd0d75dba415b9f3dc81f5a34773ce.tar.gz |
read string sections such as .modinfo with load_strings()
Changes to load_strings():
* export in struct module_ops
* avoid buffer overruns by looking for a string terminator
at the end of a section.
* new errfn_t parameter selects error message type.
If load_strings fails on a missing string terminator, the module
is probably broken.
Therefore, modprobe and depmod sets errfn_t error = fatal.
Modinfo on the other hand sets errfn_t error = error.
Signed-off-by: Andreas Robinson <andr345@gmail.com>
-rw-r--r-- | depmod.c | 42 | ||||
-rw-r--r-- | elfops.h | 3 | ||||
-rw-r--r-- | elfops_core.c | 8 | ||||
-rw-r--r-- | modinfo.c | 25 | ||||
-rw-r--r-- | modprobe.c | 9 |
5 files changed, 50 insertions, 37 deletions
@@ -770,8 +770,8 @@ static void output_aliases(struct module *modules, FILE *out, char *dirname) { struct module *i; struct elf_file *file; - const char *p; - unsigned long size; + struct string_table *tbl; + int j; fprintf(out, "# Aliases extracted from modules themselves.\n"); for (i = modules; i; i = i->next) { @@ -781,19 +781,20 @@ static void output_aliases(struct module *modules, FILE *out, char *dirname) filename2modname(modname, i->pathname); /* Grab from old-style .modalias section. */ - for (p = file->ops->get_aliases(file, &size); - p; - p = next_string(p, &size)) - fprintf(out, "alias %s %s\n", p, modname); - - /* Grab form new-style .modinfo section. */ - for (p = file->ops->get_modinfo(file, &size); - p; - p = next_string(p, &size)) { + tbl = file->ops->load_strings(file, ".modalias", NULL, fatal); + for (j = 0; tbl && j < tbl->cnt; j++) + fprintf(out, "alias %s %s\n", tbl->str[j], modname); + strtbl_free(tbl); + + /* Grab from new-style .modinfo section. */ + tbl = file->ops->load_strings(file, ".modinfo", NULL, fatal); + for (j = 0; tbl && j < tbl->cnt; j++) { + const char *p = tbl->str[j]; if (strstarts(p, "alias=")) fprintf(out, "alias %s %s\n", p + strlen("alias="), modname); } + strtbl_free(tbl); } } @@ -801,9 +802,9 @@ static void output_aliases_bin(struct module *modules, FILE *out, char *dirname) { struct module *i; struct elf_file *file; - const char *p; + struct string_table *tbl; + int j; char *alias; - unsigned long size; struct index_node *index; int duplicate; @@ -816,10 +817,9 @@ static void output_aliases_bin(struct module *modules, FILE *out, char *dirname) filename2modname(modname, i->pathname); /* Grab from old-style .modalias section. */ - for (p = file->ops->get_aliases(file, &size); - p; - p = next_string(p, &size)) { - alias = NOFAIL(strdup(p)); + tbl = file->ops->load_strings(file, ".modalias", NULL, fatal); + for (j = 0; tbl && j < tbl->cnt; j++) { + alias = NOFAIL(strdup(tbl->str[j])); underscores(alias); duplicate = index_insert(index, alias, modname, i->order); if (duplicate && warn_dups) @@ -827,11 +827,12 @@ static void output_aliases_bin(struct module *modules, FILE *out, char *dirname) alias, modname); free(alias); } + strtbl_free(tbl); /* Grab from new-style .modinfo section. */ - for (p = file->ops->get_modinfo(file, &size); - p; - p = next_string(p, &size)) { + tbl = file->ops->load_strings(file, ".modinfo", NULL, fatal); + for (j = 0; tbl && j < tbl->cnt; j++) { + const char *p = tbl->str[j]; if (strstarts(p, "alias=")) { alias = NOFAIL(strdup(p + strlen("alias="))); underscores(alias); @@ -842,6 +843,7 @@ static void output_aliases_bin(struct module *modules, FILE *out, char *dirname) free(alias); } } + strtbl_free(tbl); } index_write(index, out); @@ -2,6 +2,7 @@ #define MODINITTOOLS_MODULEOPS_H #include <stdio.h> #include <stdint.h> +#include "logging.h" /* All the icky stuff to do with manipulating 64 and 32-bit modules belongs here. */ @@ -71,6 +72,8 @@ struct module_ops { void *(*load_section)(struct elf_file *module, const char *secname, unsigned long *secsize); + struct string_table *(*load_strings)(struct elf_file *module, + const char *secname, struct string_table *tbl, errfn_t error); struct string_table *(*load_symbols)(struct elf_file *module); struct string_table *(*load_dep_syms)(const char *pathname, struct elf_file *module, struct string_table **types); diff --git a/elfops_core.c b/elfops_core.c index 4283d65..c5e84ba 100644 --- a/elfops_core.c +++ b/elfops_core.c @@ -80,7 +80,8 @@ static void *PERBIT(load_section)(struct elf_file *module, static struct string_table *PERBIT(load_strings)(struct elf_file *module, const char *secname, - struct string_table *tbl) + struct string_table *tbl, + errfn_t error) { unsigned long size; const char *strings; @@ -108,11 +109,11 @@ static struct string_table *PERBIT(load_symbols)(struct elf_file *module) symtbl = NULL; /* New-style: strings are in this section. */ - symtbl = PERBIT(load_strings)(module, "__ksymtab_strings", symtbl); + symtbl = PERBIT(load_strings)(module, "__ksymtab_strings", symtbl, fatal); if (symtbl) { /* GPL symbols too */ return PERBIT(load_strings)(module, "__ksymtab_strings_gpl", - symtbl); + symtbl, fatal); } /* Old-style. */ @@ -338,6 +339,7 @@ static int PERBIT(dump_modversions)(struct elf_file *module) struct module_ops PERBIT(mod_ops) = { .load_section = PERBIT(load_section), + .load_strings = PERBIT(load_strings), .load_symbols = PERBIT(load_symbols), .load_dep_syms = PERBIT(load_dep_syms), .fetch_tables = PERBIT(fetch_tables), @@ -50,9 +50,10 @@ static struct param *add_param(const char *name, struct param **list) return i; } -static void print_tag(const char *tag, const char *info, unsigned long size, +static void print_tag(const char *tag, struct string_table *tags, const char *filename, char sep) { + int j; unsigned int taglen = strlen(tag); if (streq(tag, "filename")) { @@ -60,18 +61,22 @@ static void print_tag(const char *tag, const char *info, unsigned long size, return; } - for (; info; info = next_string(info, &size)) + for (j = 0; j < tags->cnt; j++) { + const char *info = tags->str[j]; if (strncmp(info, tag, taglen) == 0 && info[taglen] == '=') printf("%s%c", info + taglen + 1, sep); + } } -static void print_all(const char *info, unsigned long size, +static void print_all(struct string_table *tags, const char *filename, char sep) { + int j; struct param *i, *params = NULL; printf("%-16s%s%c", "filename:", filename, sep); - for (; info; info = next_string(info, &size)) { + for (j = 0; j < tags->cnt; j++) { + const char *info = tags->str[j]; char *eq, *colon; /* We expect this in parm and parmtype. */ @@ -294,8 +299,7 @@ int main(int argc, char *argv[]) } for (opt = optind; opt < argc; opt++) { - void *info; - unsigned long infosize = 0; + struct string_table *tags; struct elf_file *mod; mod = grab_module(argv[opt], kernel, basedir); @@ -303,15 +307,16 @@ int main(int argc, char *argv[]) ret = 1; continue; } - info = mod->ops->get_modinfo(mod, &infosize); - if (!info) { + tags = mod->ops->load_strings(mod, ".modinfo", NULL, error); + if (!tags) { release_elf_file(mod); continue; } if (field) - print_tag(field, info, infosize, mod->pathname, sep); + print_tag(field, tags, mod->pathname, sep); else - print_all(info, infosize, mod->pathname, sep); + print_all(tags, mod->pathname, sep); + strtbl_free(tags); release_elf_file(mod); } return ret; @@ -324,15 +324,16 @@ static void rename_module(struct elf_file *module, static void clear_magic(struct elf_file *module) { - const char *p; - unsigned long len; + struct string_table *tbl; + int j; /* Old-style: __vermagic section */ module->ops->strip_section(module, "__vermagic"); /* New-style: in .modinfo section */ - p = module->ops->get_modinfo(module, &len); - for (; p; p = next_string(p, &len)) { + tbl = module->ops->load_strings(module, ".modinfo", NULL, fatal); + for (j = 0; tbl && j < tbl->cnt; j++) { + const char *p = tbl->str[j]; if (strstarts(p, "vermagic=")) { memset((char *)p, 0, strlen(p)); return; |