[tip: core/kprobes] module: Remove set_all_modules_text_*()

tip-bot2 for Peter Zijlstra
2019-11-19T16:58:29Z

The following commit has been merged into the core/kprobes branch of tip:

Commit-ID: 0e05d89d72e200f4c5129a6a80090dabf8c45a10
Gitweb: https://git.kernel.org/tip/0e05d89d72e200f4c5129a6a80090dabf8c45a10
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 15 Oct 2019 21:07:31 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Tue, 19 Nov 2019 13:13:07 +01:00

module: Remove set_all_modules_text_*()

Now that there are no users of set_all_modules_text_*() left, remove
it.

While it appears nds32 uses it, it does not have STRICT_MODULE_RWX and
therefore ends up with the NOP stubs.

Tested-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vincent Chen <deanbo422@gmail.com>
Link: https://lkml.kernel.org/r/20191111132458.284298307@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/nds32/kernel/ftrace.c | 12 +----------
include/linux/module.h | 4 +---
kernel/module.c | 43 +-------------------------------------
3 files changed, 59 deletions(-)

diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
index fd2a54b..22ab77e 100644
--- a/arch/nds32/kernel/ftrace.c
+++ b/arch/nds32/kernel/ftrace.c
@@ -89,18 +89,6 @@ int __init ftrace_dyn_arch_init(void)
return 0;
}

-int ftrace_arch_code_modify_prepare(void)
-{
- set_all_modules_text_rw();
- return 0;
-}
-
-int ftrace_arch_code_modify_post_process(void)
-{
- set_all_modules_text_ro();
- return 0;
-}
-
static unsigned long gen_sethi_insn(unsigned long addr)
{
unsigned long opcode = 0x46000000;
diff --git a/include/linux/module.h b/include/linux/module.h
index 6d20895..daae847 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -846,13 +846,9 @@ extern int module_sysfs_initialized;
#define __MODULE_STRING(x) __stringify(x)

#ifdef CONFIG_STRICT_MODULE_RWX
-extern void set_all_modules_text_rw(void);
-extern void set_all_modules_text_ro(void);
extern void module_enable_ro(const struct module *mod, bool after_init);
extern void module_disable_ro(const struct module *mod);
#else
-static inline void set_all_modules_text_rw(void) { }
-static inline void set_all_modules_text_ro(void) { }
static inline void module_enable_ro(const struct module *mod, bool after_init) { }
static inline void module_disable_ro(const struct module *mod) { }
#endif
diff --git a/kernel/module.c b/kernel/module.c
index ff2d735..62a6245 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2029,49 +2029,6 @@ static void module_enable_nx(const struct module *mod)
frob_writable_data(&mod->init_layout, set_memory_nx);
}

-/* Iterate through all modules and set each module's text as RW */
-void set_all_modules_text_rw(void)
-{
- struct module *mod;
-
- if (!rodata_enabled)
- return;
-
- mutex_lock(&module_mutex);
- list_for_each_entry_rcu(mod, &modules, list) {
- if (mod->state == MODULE_STATE_UNFORMED)
- continue;
-
- frob_text(&mod->core_layout, set_memory_rw);
- frob_text(&mod->init_layout, set_memory_rw);
- }
- mutex_unlock(&module_mutex);
-}
-
-/* Iterate through all modules and set each module's text as RO */
-void set_all_modules_text_ro(void)
-{
- struct module *mod;
-
- if (!rodata_enabled)
- return;
-
- mutex_lock(&module_mutex);
- list_for_each_entry_rcu(mod, &modules, list) {
- /*
- * Ignore going modules since it's possible that ro
- * protection has already been disabled, otherwise we'll
- * run into protection faults at module deallocation.
- */
- if (mod->state == MODULE_STATE_UNFORMED ||
- mod->state == MODULE_STATE_GOING)
- continue;
-
- frob_text(&mod->core_layout, set_memory_ro);
- frob_text(&mod->init_layout, set_memory_ro);
- }
- mutex_unlock(&module_mutex);
-}
#else /* !CONFIG_STRICT_MODULE_RWX */
static void module_enable_nx(const struct module *mod) { }
#endif /* CONFIG_STRICT_MODULE_RWX */