Commit be7de5f9 authored by Prarit Bhargava's avatar Prarit Bhargava Committed by Rusty Russell

modules: Add kernel parameter to blacklist modules

Blacklisting a module in linux has long been a problem.  The current
procedure is to use rd.blacklist=module_name, however, that doesn't
cover the case after the initramfs and before a boot prompt (where one
is supposed to use /etc/modprobe.d/blacklist.conf to blacklist
runtime loading). Using to get an early prompt is hit-or-miss,
and doesn't cover all situations AFAICT.

This patch adds this functionality of permanently blacklisting a module
by its name via the kernel parameter module_blacklist=module_name.

[v2]: Rusty, use core_param() instead of __setup() which simplifies

[v3]: Rusty, undo wreckage from strsep()

[v4]: Rusty, simpler version of blacklisted()
Signed-off-by: default avatarPrarit Bhargava <>
Cc: Jonathan Corbet <>
Cc: Rusty Russell <>
Signed-off-by: default avatarRusty Russell <>
parent 9502514f
......@@ -2301,6 +2301,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Note that if CONFIG_MODULE_SIG_FORCE is set, that
is always true, so this option does nothing.
module_blacklist= [KNL] Do not load a comma-separated list of
modules. Useful for debugging problem modules.
[MOUSE] Maximum time between finger touching and
leaving touchpad surface for touch to be considered
......@@ -3168,6 +3168,27 @@ int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
return 0;
/* module_blacklist is a comma-separated list of module names */
static char *module_blacklist;
static bool blacklisted(char *module_name)
const char *p;
size_t len;
if (!module_blacklist)
return false;
for (p = module_blacklist; *p; p += len) {
len = strcspn(p, ",");
if (strlen(module_name) == len && !memcmp(module_name, p, len))
return true;
if (p[len] == ',')
return false;
core_param(module_blacklist, module_blacklist, charp, 0400);
static struct module *layout_and_allocate(struct load_info *info, int flags)
/* Module within temporary copy. */
......@@ -3178,6 +3199,9 @@ static struct module *layout_and_allocate(struct load_info *info, int flags)
if (IS_ERR(mod))
return mod;
if (blacklisted(mod->name))
return ERR_PTR(-EPERM);
err = check_modinfo(mod, info, flags);
if (err)
return ERR_PTR(err);
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