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-rw-r--r--Documentation/ABI/stable/sysfs-module10
-rw-r--r--include/linux/moduleparam.h2
-rw-r--r--kernel/module.c77
-rw-r--r--kernel/params.c2
4 files changed, 52 insertions, 39 deletions
diff --git a/Documentation/ABI/stable/sysfs-module b/Documentation/ABI/stable/sysfs-module
index a0dd21c6db59..6272ae5fb366 100644
--- a/Documentation/ABI/stable/sysfs-module
+++ b/Documentation/ABI/stable/sysfs-module
@@ -4,9 +4,13 @@ Description:
/sys/module/MODULENAME
The name of the module that is in the kernel. This
- module name will show up either if the module is built
- directly into the kernel, or if it is loaded as a
- dynamic module.
+ module name will always show up if the module is loaded as a
+ dynamic module. If it is built directly into the kernel, it
+ will only show up if it has a version or at least one
+ parameter.
+
+ Note: The conditions of creation in the built-in case are not
+ by design and may be removed in the future.
/sys/module/MODULENAME/parameters
This directory contains individual files that are each
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 137b4198fc03..27d9da3f86ff 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -439,7 +439,7 @@ extern struct kernel_param_ops param_ops_string;
extern int param_set_copystring(const char *val, const struct kernel_param *);
extern int param_get_string(char *buffer, const struct kernel_param *kp);
-/* for exporting parameters in /sys/parameters */
+/* for exporting parameters in /sys/module/.../parameters */
struct module;
diff --git a/kernel/module.c b/kernel/module.c
index cab4bce49c23..206915830d29 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -455,7 +455,7 @@ const struct kernel_symbol *find_symbol(const char *name,
EXPORT_SYMBOL_GPL(find_symbol);
/* Search for module by name: must hold module_mutex. */
-static struct module *find_module_all(const char *name,
+static struct module *find_module_all(const char *name, size_t len,
bool even_unformed)
{
struct module *mod;
@@ -463,7 +463,7 @@ static struct module *find_module_all(const char *name,
list_for_each_entry(mod, &modules, list) {
if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
continue;
- if (strcmp(mod->name, name) == 0)
+ if (strlen(mod->name) == len && !memcmp(mod->name, name, len))
return mod;
}
return NULL;
@@ -471,7 +471,7 @@ static struct module *find_module_all(const char *name,
struct module *find_module(const char *name)
{
- return find_module_all(name, false);
+ return find_module_all(name, strlen(name), false);
}
EXPORT_SYMBOL_GPL(find_module);
@@ -482,23 +482,28 @@ static inline void __percpu *mod_percpu(struct module *mod)
return mod->percpu;
}
-static int percpu_modalloc(struct module *mod,
- unsigned long size, unsigned long align)
+static int percpu_modalloc(struct module *mod, struct load_info *info)
{
+ Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu];
+ unsigned long align = pcpusec->sh_addralign;
+
+ if (!pcpusec->sh_size)
+ return 0;
+
if (align > PAGE_SIZE) {
printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
mod->name, align, PAGE_SIZE);
align = PAGE_SIZE;
}
- mod->percpu = __alloc_reserved_percpu(size, align);
+ mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align);
if (!mod->percpu) {
printk(KERN_WARNING
"%s: Could not allocate %lu bytes percpu data\n",
- mod->name, size);
+ mod->name, (unsigned long)pcpusec->sh_size);
return -ENOMEM;
}
- mod->percpu_size = size;
+ mod->percpu_size = pcpusec->sh_size;
return 0;
}
@@ -563,10 +568,12 @@ static inline void __percpu *mod_percpu(struct module *mod)
{
return NULL;
}
-static inline int percpu_modalloc(struct module *mod,
- unsigned long size, unsigned long align)
+static int percpu_modalloc(struct module *mod, struct load_info *info)
{
- return -ENOMEM;
+ /* UP modules shouldn't have this section: ENOMEM isn't quite right */
+ if (info->sechdrs[info->index.pcpu].sh_size != 0)
+ return -ENOMEM;
+ return 0;
}
static inline void percpu_modfree(struct module *mod)
{
@@ -2927,7 +2934,6 @@ static struct module *layout_and_allocate(struct load_info *info, int flags)
{
/* Module within temporary copy. */
struct module *mod;
- Elf_Shdr *pcpusec;
int err;
mod = setup_load_info(info, flags);
@@ -2942,17 +2948,10 @@ static struct module *layout_and_allocate(struct load_info *info, int flags)
err = module_frob_arch_sections(info->hdr, info->sechdrs,
info->secstrings, mod);
if (err < 0)
- goto out;
+ return ERR_PTR(err);
- pcpusec = &info->sechdrs[info->index.pcpu];
- if (pcpusec->sh_size) {
- /* We have a special allocation for this section. */
- err = percpu_modalloc(mod,
- pcpusec->sh_size, pcpusec->sh_addralign);
- if (err)
- goto out;
- pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
- }
+ /* We will do a special allocation for per-cpu sections later. */
+ info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC;
/* Determine total sizes, and put offsets in sh_entsize. For now
this is done generically; there doesn't appear to be any
@@ -2963,17 +2962,12 @@ static struct module *layout_and_allocate(struct load_info *info, int flags)
/* Allocate and move to the final place */
err = move_module(mod, info);
if (err)
- goto free_percpu;
+ return ERR_PTR(err);
/* Module has been copied to its final place now: return it. */
mod = (void *)info->sechdrs[info->index.mod].sh_addr;
kmemleak_load_module(mod, info);
return mod;
-
-free_percpu:
- percpu_modfree(mod);
-out:
- return ERR_PTR(err);
}
/* mod is no longer valid after this! */
@@ -3014,7 +3008,7 @@ static bool finished_loading(const char *name)
bool ret;
mutex_lock(&module_mutex);
- mod = find_module_all(name, true);
+ mod = find_module_all(name, strlen(name), true);
ret = !mod || mod->state == MODULE_STATE_LIVE
|| mod->state == MODULE_STATE_GOING;
mutex_unlock(&module_mutex);
@@ -3152,7 +3146,8 @@ static int add_unformed_module(struct module *mod)
again:
mutex_lock(&module_mutex);
- if ((old = find_module_all(mod->name, true)) != NULL) {
+ old = find_module_all(mod->name, strlen(mod->name), true);
+ if (old != NULL) {
if (old->state == MODULE_STATE_COMING
|| old->state == MODULE_STATE_UNFORMED) {
/* Wait in case it fails to load. */
@@ -3198,6 +3193,17 @@ out:
return err;
}
+static int unknown_module_param_cb(char *param, char *val, const char *modname)
+{
+ /* Check for magic 'dyndbg' arg */
+ int ret = ddebug_dyndbg_module_param_cb(param, val, modname);
+ if (ret != 0) {
+ printk(KERN_WARNING "%s: unknown parameter '%s' ignored\n",
+ modname, param);
+ }
+ return 0;
+}
+
/* Allocate and load the module: note that size of section 0 is always
zero, and we rely on this for optional sections. */
static int load_module(struct load_info *info, const char __user *uargs,
@@ -3237,6 +3243,11 @@ static int load_module(struct load_info *info, const char __user *uargs,
}
#endif
+ /* To avoid stressing percpu allocator, do this once we're unique. */
+ err = percpu_modalloc(mod, info);
+ if (err)
+ goto unlink_mod;
+
/* Now module is in final location, initialize linked lists, etc. */
err = module_unload_init(mod);
if (err)
@@ -3284,7 +3295,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
/* Module is ready to execute: parsing args may do that. */
err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
- -32768, 32767, &ddebug_dyndbg_module_param_cb);
+ -32768, 32767, unknown_module_param_cb);
if (err < 0)
goto bug_cleanup;
@@ -3563,10 +3574,8 @@ unsigned long module_kallsyms_lookup_name(const char *name)
/* Don't lock: we're in enough trouble already. */
preempt_disable();
if ((colon = strchr(name, ':')) != NULL) {
- *colon = '\0';
- if ((mod = find_module(name)) != NULL)
+ if ((mod = find_module_all(name, colon - name, false)) != NULL)
ret = mod_find_symname(mod, colon+1);
- *colon = ':';
} else {
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
diff --git a/kernel/params.c b/kernel/params.c
index 53b958fcd639..440e65d1a544 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -787,7 +787,7 @@ static void __init kernel_add_sysfs_param(const char *name,
}
/*
- * param_sysfs_builtin - add contents in /sys/parameters for built-in modules
+ * param_sysfs_builtin - add sysfs parameters for built-in modules
*
* Add module_parameters to sysfs for "modules" built into the kernel.
*
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 16:18:31 +0000