kmod/libkmod
Emil Velikov 90b271fbd2 libkmod: clear file->memory if map fails
On mmap failure file->memory is set to -1, which we'll happily pass down
to munmap later on.

More importantly, since we do a NULL check in kmod_file_load_contents()
we will exit the function without (re)attempting the load again.

Since we ignore the return code for the load function(s), one can end up
calling kmod_elf_get_memory() and feed that -1 into init_module.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>
2024-04-30 12:33:52 -05:00
..
docs docs: Add missing functions to documentation 2022-03-03 00:57:10 -08:00
.gitignore Rename libabc to libkmod 2011-11-21 14:35:35 -02:00
COPYING Change licenses 2011-12-12 18:24:35 -02:00
libkmod-builtin.c libkmod: annotate kmod_builtin_iter API as static 2023-02-21 16:35:37 -08:00
libkmod-config.c libkmod-config: fix a memory leak when kmod_list_append() fails 2021-04-09 08:12:01 -07:00
libkmod-elf.c libkmod: Do not inititialize file->memory on open 2023-06-09 10:45:51 -07:00
libkmod-file.c libkmod: clear file->memory if map fails 2024-04-30 12:33:52 -05:00
libkmod-index.c libkmod: fix return error when opening index 2020-03-23 12:37:40 -07:00
libkmod-index.h libkmod: fix return error when opening index 2020-03-23 12:37:40 -07:00
libkmod-internal.h libkmod: Use kernel decompression when available 2023-06-20 14:39:25 -07:00
libkmod-list.c Remove FSF mailing address 2014-12-25 23:41:34 -02:00
libkmod-module.c libkmod: Use kernel decompression when available 2023-06-20 14:39:25 -07:00
libkmod-signature.c libkmod: remove pkcs7 obj_to_hash_algo() 2023-11-07 14:05:44 -06:00
libkmod.c libkmod, depmod, modprobe: Make directory for kernel modules configurable 2023-12-06 09:53:05 -06:00
libkmod.h libkmod: Allow to ignore log message on module removal 2022-06-26 23:23:46 -07:00
libkmod.pc.in add Zstandard compression support 2020-09-10 21:55:01 -07:00
libkmod.sym libkmod: Add lookup from module name 2022-02-20 20:58:11 -08:00
Makefile build-sys: add small redirecting Makefiles 2014-03-06 01:59:58 -03:00
README README: Move items from TODO 2013-07-17 02:31:27 -03:00

libkmod - linux kernel module handling library

ABSTRACT
========

libkmod was created to allow programs to easily insert, remove and
list modules, also checking its properties, dependencies and aliases.

there is no shared/global context information and it can be used by
multiple sites on a single program, also being able to be used from
threads, although it's not thread safe (you must lock explicitly).


OVERVIEW
========

Every user should create and manage it's own library context with:

   struct kmod_ctx *ctx = kmod_new(kernel_dirname);
   kmod_unref(ctx);


Modules can be created by various means:

   struct kmod_module *mod;
   int err;

   err = kmod_module_new_from_path(ctx, path, &mod);
   if (err < 0) {
      /* code */
   } else {
      /* code */
      kmod_module_unref(mod);
   }

   err = kmod_module_new_from_name(ctx, name, &mod);
   if (err < 0) {
      /* code */
   } else {
      /* code */
      kmod_module_unref(mod);
   }


Or could be resolved from a known alias to a list of alternatives:

   struct kmod_list *list, *itr;
   int err;
   err = kmod_module_new_from_lookup(ctx, alias, &list);
   if (err < 0) {
      /* code */
   } else {
      kmod_list_foreach(itr, list) {
         struct kmod_module *mod = kmod_module_get_module(itr);
         /* code */
      }
   }