From: "Mike Rapoport (IBM)" <rppt@kernel.org>
kprobes depended on CONFIG_MODULES because it has to allocate memory for
code.
Since code allocations are now implemented with execmem, kprobes can be
enabled in non-modular kernels.
Add #ifdef CONFIG_MODULE guards for the code dealing with kprobes inside
modules, make CONFIG_KPROBES select CONFIG_EXECMEM and drop the
dependency of CONFIG_KPROBES on CONFIG_MODULES.
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
---
arch/Kconfig | 2 +-
include/linux/module.h | 9 ++++++
kernel/kprobes.c | 55 +++++++++++++++++++++++--------------
kernel/trace/trace_kprobe.c | 20 +++++++++++++-
4 files changed, 63 insertions(+), 23 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 7006f71f0110..a48ce6a488b3 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -52,9 +52,9 @@ config GENERIC_ENTRY
config KPROBES
bool "Kprobes"
- depends on MODULES
depends on HAVE_KPROBES
select KALLSYMS
+ select EXECMEM
select TASKS_RCU if PREEMPTION
help
Kprobes allows you to trap at almost any kernel address and
diff --git a/include/linux/module.h b/include/linux/module.h
index 1153b0d99a80..ffa1c603163c 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -605,6 +605,11 @@ static inline bool module_is_live(struct module *mod)
return mod->state != MODULE_STATE_GOING;
}
+static inline bool module_is_coming(struct module *mod)
+{
+ return mod->state == MODULE_STATE_COMING;
+}
+
struct module *__module_text_address(unsigned long addr);
struct module *__module_address(unsigned long addr);
bool is_module_address(unsigned long addr);
@@ -857,6 +862,10 @@ void *dereference_module_function_descriptor(struct module *mod, void *ptr)
return ptr;
}
+static inline bool module_is_coming(struct module *mod)
+{
+ return false;
+}
#endif /* CONFIG_MODULES */
#ifdef CONFIG_SYSFS
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index ddd7cdc16edf..ca2c6cbd42d2 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1588,7 +1588,7 @@ static int check_kprobe_address_safe(struct kprobe *p,
}
/* Get module refcount and reject __init functions for loaded modules. */
- if (*probed_mod) {
+ if (IS_ENABLED(CONFIG_MODULES) && *probed_mod) {
/*
* We must hold a refcount of the probed module while updating
* its code to prohibit unexpected unloading.
@@ -1603,12 +1603,13 @@ static int check_kprobe_address_safe(struct kprobe *p,
* kprobes in there.
*/
if (within_module_init((unsigned long)p->addr, *probed_mod) &&
- (*probed_mod)->state != MODULE_STATE_COMING) {
+ !module_is_coming(*probed_mod)) {
module_put(*probed_mod);
*probed_mod = NULL;
ret = -ENOENT;
}
}
+
out:
preempt_enable();
jump_label_unlock();
@@ -2488,24 +2489,6 @@ int kprobe_add_area_blacklist(unsigned long start, unsigned long end)
return 0;
}
-/* Remove all symbols in given area from kprobe blacklist */
-static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end)
-{
- struct kprobe_blacklist_entry *ent, *n;
-
- list_for_each_entry_safe(ent, n, &kprobe_blacklist, list) {
- if (ent->start_addr < start || ent->start_addr >= end)
- continue;
- list_del(&ent->list);
- kfree(ent);
- }
-}
-
-static void kprobe_remove_ksym_blacklist(unsigned long entry)
-{
- kprobe_remove_area_blacklist(entry, entry + 1);
-}
-
int __weak arch_kprobe_get_kallsym(unsigned int *symnum, unsigned long *value,
char *type, char *sym)
{
@@ -2570,6 +2553,25 @@ static int __init populate_kprobe_blacklist(unsigned long *start,
return ret ? : arch_populate_kprobe_blacklist();
}
+#ifdef CONFIG_MODULES
+/* Remove all symbols in given area from kprobe blacklist */
+static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end)
+{
+ struct kprobe_blacklist_entry *ent, *n;
+
+ list_for_each_entry_safe(ent, n, &kprobe_blacklist, list) {
+ if (ent->start_addr < start || ent->start_addr >= end)
+ continue;
+ list_del(&ent->list);
+ kfree(ent);
+ }
+}
+
+static void kprobe_remove_ksym_blacklist(unsigned long entry)
+{
+ kprobe_remove_area_blacklist(entry, entry + 1);
+}
+
static void add_module_kprobe_blacklist(struct module *mod)
{
unsigned long start, end;
@@ -2672,6 +2674,17 @@ static struct notifier_block kprobe_module_nb = {
.priority = 0
};
+static int kprobe_register_module_notifier(void)
+{
+ return register_module_notifier(&kprobe_module_nb);
+}
+#else
+static int kprobe_register_module_notifier(void)
+{
+ return 0;
+}
+#endif /* CONFIG_MODULES */
+
void kprobe_free_init_mem(void)
{
void *start = (void *)(&__init_begin);
@@ -2731,7 +2744,7 @@ static int __init init_kprobes(void)
if (!err)
err = register_die_notifier(&kprobe_exceptions_nb);
if (!err)
- err = register_module_notifier(&kprobe_module_nb);
+ err = kprobe_register_module_notifier();
kprobes_initialized = (err == 0);
kprobe_sysctls_init();
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 14099cc17fc9..2cb2a3951b4f 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -111,6 +111,7 @@ static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,
return strncmp(module_name(mod), name, len) == 0 && name[len] == ':';
}
+#ifdef CONFIG_MODULES
static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
{
char *p;
@@ -129,6 +130,12 @@ static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
return ret;
}
+#else
+static inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
+{
+ return false;
+}
+#endif
static bool trace_kprobe_is_busy(struct dyn_event *ev)
{
@@ -670,6 +677,7 @@ static int register_trace_kprobe(struct trace_kprobe *tk)
return ret;
}
+#ifdef CONFIG_MODULES
/* Module notifier call back, checking event on the module */
static int trace_kprobe_module_callback(struct notifier_block *nb,
unsigned long val, void *data)
@@ -704,6 +712,16 @@ static struct notifier_block trace_kprobe_module_nb = {
.notifier_call = trace_kprobe_module_callback,
.priority = 1 /* Invoked after kprobe module callback */
};
+static int trace_kprobe_register_module_notifier(void)
+{
+ return register_module_notifier(&trace_kprobe_module_nb);
+}
+#else
+static int trace_kprobe_register_module_notifier(void)
+{
+ return 0;
+}
+#endif /* CONFIG_MODULES */
static int count_symbols(void *data, unsigned long unused)
{
@@ -1933,7 +1951,7 @@ static __init int init_kprobe_trace_early(void)
if (ret)
return ret;
- if (register_module_notifier(&trace_kprobe_module_nb))
+ if (trace_kprobe_register_module_notifier())
return -EINVAL;
return 0;
--
2.43.0On Mon, 22 Apr 2024 12:44:35 +0300
Mike Rapoport <rppt@kernel.org> wrote:
> From: "Mike Rapoport (IBM)" <rppt@kernel.org>
>
> kprobes depended on CONFIG_MODULES because it has to allocate memory for
> code.
>
> Since code allocations are now implemented with execmem, kprobes can be
> enabled in non-modular kernels.
>
> Add #ifdef CONFIG_MODULE guards for the code dealing with kprobes inside
> modules, make CONFIG_KPROBES select CONFIG_EXECMEM and drop the
> dependency of CONFIG_KPROBES on CONFIG_MODULES.
Looks good to me.
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Thank you!
>
> Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
> ---
> arch/Kconfig | 2 +-
> include/linux/module.h | 9 ++++++
> kernel/kprobes.c | 55 +++++++++++++++++++++++--------------
> kernel/trace/trace_kprobe.c | 20 +++++++++++++-
> 4 files changed, 63 insertions(+), 23 deletions(-)
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 7006f71f0110..a48ce6a488b3 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -52,9 +52,9 @@ config GENERIC_ENTRY
>
> config KPROBES
> bool "Kprobes"
> - depends on MODULES
> depends on HAVE_KPROBES
> select KALLSYMS
> + select EXECMEM
> select TASKS_RCU if PREEMPTION
> help
> Kprobes allows you to trap at almost any kernel address and
> diff --git a/include/linux/module.h b/include/linux/module.h
> index 1153b0d99a80..ffa1c603163c 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -605,6 +605,11 @@ static inline bool module_is_live(struct module *mod)
> return mod->state != MODULE_STATE_GOING;
> }
>
> +static inline bool module_is_coming(struct module *mod)
> +{
> + return mod->state == MODULE_STATE_COMING;
> +}
> +
> struct module *__module_text_address(unsigned long addr);
> struct module *__module_address(unsigned long addr);
> bool is_module_address(unsigned long addr);
> @@ -857,6 +862,10 @@ void *dereference_module_function_descriptor(struct module *mod, void *ptr)
> return ptr;
> }
>
> +static inline bool module_is_coming(struct module *mod)
> +{
> + return false;
> +}
> #endif /* CONFIG_MODULES */
>
> #ifdef CONFIG_SYSFS
> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index ddd7cdc16edf..ca2c6cbd42d2 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -1588,7 +1588,7 @@ static int check_kprobe_address_safe(struct kprobe *p,
> }
>
> /* Get module refcount and reject __init functions for loaded modules. */
> - if (*probed_mod) {
> + if (IS_ENABLED(CONFIG_MODULES) && *probed_mod) {
> /*
> * We must hold a refcount of the probed module while updating
> * its code to prohibit unexpected unloading.
> @@ -1603,12 +1603,13 @@ static int check_kprobe_address_safe(struct kprobe *p,
> * kprobes in there.
> */
> if (within_module_init((unsigned long)p->addr, *probed_mod) &&
> - (*probed_mod)->state != MODULE_STATE_COMING) {
> + !module_is_coming(*probed_mod)) {
> module_put(*probed_mod);
> *probed_mod = NULL;
> ret = -ENOENT;
> }
> }
> +
> out:
> preempt_enable();
> jump_label_unlock();
> @@ -2488,24 +2489,6 @@ int kprobe_add_area_blacklist(unsigned long start, unsigned long end)
> return 0;
> }
>
> -/* Remove all symbols in given area from kprobe blacklist */
> -static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end)
> -{
> - struct kprobe_blacklist_entry *ent, *n;
> -
> - list_for_each_entry_safe(ent, n, &kprobe_blacklist, list) {
> - if (ent->start_addr < start || ent->start_addr >= end)
> - continue;
> - list_del(&ent->list);
> - kfree(ent);
> - }
> -}
> -
> -static void kprobe_remove_ksym_blacklist(unsigned long entry)
> -{
> - kprobe_remove_area_blacklist(entry, entry + 1);
> -}
> -
> int __weak arch_kprobe_get_kallsym(unsigned int *symnum, unsigned long *value,
> char *type, char *sym)
> {
> @@ -2570,6 +2553,25 @@ static int __init populate_kprobe_blacklist(unsigned long *start,
> return ret ? : arch_populate_kprobe_blacklist();
> }
>
> +#ifdef CONFIG_MODULES
> +/* Remove all symbols in given area from kprobe blacklist */
> +static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end)
> +{
> + struct kprobe_blacklist_entry *ent, *n;
> +
> + list_for_each_entry_safe(ent, n, &kprobe_blacklist, list) {
> + if (ent->start_addr < start || ent->start_addr >= end)
> + continue;
> + list_del(&ent->list);
> + kfree(ent);
> + }
> +}
> +
> +static void kprobe_remove_ksym_blacklist(unsigned long entry)
> +{
> + kprobe_remove_area_blacklist(entry, entry + 1);
> +}
> +
> static void add_module_kprobe_blacklist(struct module *mod)
> {
> unsigned long start, end;
> @@ -2672,6 +2674,17 @@ static struct notifier_block kprobe_module_nb = {
> .priority = 0
> };
>
> +static int kprobe_register_module_notifier(void)
> +{
> + return register_module_notifier(&kprobe_module_nb);
> +}
> +#else
> +static int kprobe_register_module_notifier(void)
> +{
> + return 0;
> +}
> +#endif /* CONFIG_MODULES */
> +
> void kprobe_free_init_mem(void)
> {
> void *start = (void *)(&__init_begin);
> @@ -2731,7 +2744,7 @@ static int __init init_kprobes(void)
> if (!err)
> err = register_die_notifier(&kprobe_exceptions_nb);
> if (!err)
> - err = register_module_notifier(&kprobe_module_nb);
> + err = kprobe_register_module_notifier();
>
> kprobes_initialized = (err == 0);
> kprobe_sysctls_init();
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 14099cc17fc9..2cb2a3951b4f 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -111,6 +111,7 @@ static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,
> return strncmp(module_name(mod), name, len) == 0 && name[len] == ':';
> }
>
> +#ifdef CONFIG_MODULES
> static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
> {
> char *p;
> @@ -129,6 +130,12 @@ static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
>
> return ret;
> }
> +#else
> +static inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
> +{
> + return false;
> +}
> +#endif
>
> static bool trace_kprobe_is_busy(struct dyn_event *ev)
> {
> @@ -670,6 +677,7 @@ static int register_trace_kprobe(struct trace_kprobe *tk)
> return ret;
> }
>
> +#ifdef CONFIG_MODULES
> /* Module notifier call back, checking event on the module */
> static int trace_kprobe_module_callback(struct notifier_block *nb,
> unsigned long val, void *data)
> @@ -704,6 +712,16 @@ static struct notifier_block trace_kprobe_module_nb = {
> .notifier_call = trace_kprobe_module_callback,
> .priority = 1 /* Invoked after kprobe module callback */
> };
> +static int trace_kprobe_register_module_notifier(void)
> +{
> + return register_module_notifier(&trace_kprobe_module_nb);
> +}
> +#else
> +static int trace_kprobe_register_module_notifier(void)
> +{
> + return 0;
> +}
> +#endif /* CONFIG_MODULES */
>
> static int count_symbols(void *data, unsigned long unused)
> {
> @@ -1933,7 +1951,7 @@ static __init int init_kprobe_trace_early(void)
> if (ret)
> return ret;
>
> - if (register_module_notifier(&trace_kprobe_module_nb))
> + if (trace_kprobe_register_module_notifier())
> return -EINVAL;
>
> return 0;
> --
> 2.43.0
>
--
Masami Hiramatsu (Google) <mhiramat@kernel.org>
© 2016 - 2026 Red Hat, Inc.