module_arch_freeing_init(): new hook for archs before module->module_init freed.

Archs have been abusing module_free() to clean up their arch-specific
allocations.  Since module_free() is also (ab)used by BPF and trace code,
let's keep it to simple allocations, and provide a hook called before
that.

This means that avr32, ia64, parisc and s390 no longer need to implement
their own module_free() at all.  avr32 doesn't need module_finalize()
either.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: linux-s390@vger.kernel.org

diff --git a/arch/avr32/kernel/module.c b/arch/avr32/kernel/module.c
index 2c94129..164efa0 100644 (file)
--- a/arch/avr32/kernel/module.c
+++ b/arch/avr32/kernel/module.c
@@ -19,12 +19,10 @@
 #include <linux/moduleloader.h>
 #include <linux/vmalloc.h>
 
-void module_free(struct module *mod, void *module_region)
+void module_arch_freeing_init(struct module *mod)
 {
        vfree(mod->arch.syminfo);
        mod->arch.syminfo = NULL;
-
-       vfree(module_region);
 }
 
 static inline int check_rela(Elf32_Rela *rela, struct module *module,
@@ -291,12 +289,3 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
 
        return ret;
 }
-
-int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
-                   struct module *module)
-{
-       vfree(module->arch.syminfo);
-       module->arch.syminfo = NULL;
-
-       return 0;
-}

diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index 24603be..29754aa 100644 (file)
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -305,14 +305,12 @@ plt_target (struct plt_entry *plt)
 #endif /* !USE_BRL */
 
 void
-module_free (struct module *mod, void *module_region)
+module_arch_freeing_init (struct module *mod)
 {
-       if (mod && mod->arch.init_unw_table &&
-           module_region == mod->module_init) {
+       if (mod->arch.init_unw_table) {
                unw_remove_unwind_table(mod->arch.init_unw_table);
                mod->arch.init_unw_table = NULL;
        }
-       vfree(module_region);
 }
 
 /* Have we already seen one of these relocations? */

diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c
index 50dfafc..5822e8e 100644 (file)
--- a/arch/parisc/kernel/module.c
+++ b/arch/parisc/kernel/module.c
@@ -298,14 +298,10 @@ static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
 }
 #endif
 
-
-/* Free memory returned from module_alloc */
-void module_free(struct module *mod, void *module_region)
+void module_arch_freeing_init(struct module *mod)
 {
        kfree(mod->arch.section);
        mod->arch.section = NULL;
-
-       vfree(module_region);
 }
 
 /* Additional bytes needed in front of individual sections */

diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index b89b591..409d152 100644 (file)
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -55,14 +55,10 @@ void *module_alloc(unsigned long size)
 }
 #endif
 
-/* Free memory returned from module_alloc */
-void module_free(struct module *mod, void *module_region)
+void module_arch_freeing_init(struct module *mod)
 {
-       if (mod) {
-               vfree(mod->arch.syminfo);
-               mod->arch.syminfo = NULL;
-       }
-       vfree(module_region);
+       vfree(mod->arch.syminfo);
+       mod->arch.syminfo = NULL;
 }
 
 static void check_rela(Elf_Rela *rela, struct module *me)

diff --git a/arch/tile/kernel/module.c b/arch/tile/kernel/module.c
index 96447c9..62a597e 100644 (file)
--- a/arch/tile/kernel/module.c
+++ b/arch/tile/kernel/module.c
@@ -83,7 +83,7 @@ void module_free(struct module *mod, void *module_region)
                     0, 0, 0, NULL, NULL, 0);
 
        /*
-        * FIXME: If module_region == mod->module_init, trim exception
+        * FIXME: Add module_arch_freeing_init to trim exception
         * table entries.
         */
 }

diff --git a/include/linux/moduleloader.h b/include/linux/moduleloader.h
index 7eeb9bb..054eac8 100644 (file)
--- a/include/linux/moduleloader.h
+++ b/include/linux/moduleloader.h
@@ -82,4 +82,6 @@ int module_finalize(const Elf_Ehdr *hdr,
 /* Any cleanup needed when module leaves. */
 void module_arch_cleanup(struct module *mod);
 
+/* Any cleanup before freeing mod->module_init */
+void module_arch_freeing_init(struct module *mod);
 #endif

diff --git a/kernel/module.c b/kernel/module.c
index 3965511..68be0b1 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1804,6 +1804,10 @@ void __weak module_arch_cleanup(struct module *mod)
 {
 }
 
+void __weak module_arch_freeing_init(struct module *mod)
+{
+}
+
 /* Free a module, remove from lists, etc. */
 static void free_module(struct module *mod)
 {
@@ -1841,6 +1845,7 @@ static void free_module(struct module *mod)
 
        /* This may be NULL, but that's OK */
        unset_module_init_ro_nx(mod);
+       module_arch_freeing_init(mod);
        module_free(mod, mod->module_init);
        kfree(mod->args);
        percpu_modfree(mod);
@@ -2930,6 +2935,7 @@ static struct module *layout_and_allocate(struct load_info *info, int flags)
 static void module_deallocate(struct module *mod, struct load_info *info)
 {
        percpu_modfree(mod);
+       module_arch_freeing_init(mod);
        module_free(mod, mod->module_init);
        module_free(mod, mod->module_core);
 }
@@ -3055,6 +3061,7 @@ static int do_init_module(struct module *mod)
        mod->strtab = mod->core_strtab;
 #endif
        unset_module_init_ro_nx(mod);
+       module_arch_freeing_init(mod);
        module_free(mod, mod->module_init);
        mod->module_init = NULL;
        mod->init_size = 0;