From: Ben Hutchings <ben@decadent.org.uk>
Date: Tue, 26 Jun 2018 16:59:01 +0100
Subject: Export symbols needed by Android drivers
Bug-Debian: https://bugs.debian.org/901492

We want to enable use of the Android ashmem and binder drivers to
support Anbox, but they should not be built-in as that would waste
resources and increase security attack surface on systems that don't
need them.

Export the currently un-exported symbols they depend on.

---
Index: linux/fs/file.c
===================================================================
--- linux.orig/fs/file.c
+++ linux/fs/file.c
@@ -409,6 +409,7 @@ struct files_struct *get_files_struct(st
 
 	return files;
 }
+EXPORT_SYMBOL_GPL(get_files_struct);
 
 void put_files_struct(struct files_struct *files)
 {
@@ -421,6 +422,7 @@ void put_files_struct(struct files_struc
 		kmem_cache_free(files_cachep, files);
 	}
 }
+EXPORT_SYMBOL_GPL(put_files_struct);
 
 void reset_files_struct(struct files_struct *files)
 {
@@ -534,6 +536,7 @@ out:
 	spin_unlock(&files->file_lock);
 	return error;
 }
+EXPORT_SYMBOL_GPL(__alloc_fd);
 
 static int alloc_fd(unsigned start, unsigned flags)
 {
@@ -607,6 +610,7 @@ void __fd_install(struct files_struct *f
 	rcu_assign_pointer(fdt->fd[fd], file);
 	rcu_read_unlock_sched();
 }
+EXPORT_SYMBOL_GPL(__fd_install);
 
 void fd_install(unsigned int fd, struct file *file)
 {
Index: linux/kernel/fork.c
===================================================================
--- linux.orig/kernel/fork.c
+++ linux/kernel/fork.c
@@ -1048,6 +1048,7 @@ void mmput_async(struct mm_struct *mm)
 		schedule_work(&mm->async_put_work);
 	}
 }
+EXPORT_SYMBOL_GPL(mmput_async);
 #endif
 
 /**
Index: linux/kernel/signal.c
===================================================================
--- linux.orig/kernel/signal.c
+++ linux/kernel/signal.c
@@ -1353,6 +1353,7 @@ struct sighand_struct *__lock_task_sigha
 
 	return sighand;
 }
+EXPORT_SYMBOL_GPL(__lock_task_sighand);
 
 /*
  * send signal info to all the members of a group
Index: linux/mm/memory.c
===================================================================
--- linux.orig/mm/memory.c
+++ linux/mm/memory.c
@@ -1611,6 +1611,7 @@ void zap_page_range(struct vm_area_struc
 	mmu_notifier_invalidate_range_end(mm, start, end);
 	tlb_finish_mmu(&tlb, start, end);
 }
+EXPORT_SYMBOL_GPL(zap_page_range);
 
 /**
  * zap_page_range_single - remove user pages in a given range
Index: linux/mm/shmem.c
===================================================================
--- linux.orig/mm/shmem.c
+++ linux/mm/shmem.c
@@ -4039,6 +4039,7 @@ int shmem_zero_setup(struct vm_area_stru
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(shmem_zero_setup);
 
 /**
  * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags.
Index: linux/mm/vmalloc.c
===================================================================
--- linux.orig/mm/vmalloc.c
+++ linux/mm/vmalloc.c
@@ -1299,6 +1299,7 @@ int map_kernel_range_noflush(unsigned lo
 {
 	return vmap_page_range_noflush(addr, addr + size, prot, pages);
 }
+EXPORT_SYMBOL_GPL(map_kernel_range_noflush);
 
 /**
  * unmap_kernel_range_noflush - unmap kernel VM area
@@ -1439,6 +1440,7 @@ struct vm_struct *get_vm_area(unsigned l
 				  NUMA_NO_NODE, GFP_KERNEL,
 				  __builtin_return_address(0));
 }
+EXPORT_SYMBOL_GPL(get_vm_area);
 
 struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
 				const void *caller)
Index: linux/security/security.c
===================================================================
--- linux.orig/security/security.c
+++ linux/security/security.c
@@ -236,24 +236,28 @@ int security_binder_set_context_mgr(stru
 {
 	return call_int_hook(binder_set_context_mgr, 0, mgr);
 }
+EXPORT_SYMBOL_GPL(security_binder_set_context_mgr);
 
 int security_binder_transaction(struct task_struct *from,
 				struct task_struct *to)
 {
 	return call_int_hook(binder_transaction, 0, from, to);
 }
+EXPORT_SYMBOL_GPL(security_binder_transaction);
 
 int security_binder_transfer_binder(struct task_struct *from,
 				    struct task_struct *to)
 {
 	return call_int_hook(binder_transfer_binder, 0, from, to);
 }
+EXPORT_SYMBOL_GPL(security_binder_transfer_binder);
 
 int security_binder_transfer_file(struct task_struct *from,
 				  struct task_struct *to, struct file *file)
 {
 	return call_int_hook(binder_transfer_file, 0, from, to, file);
 }
+EXPORT_SYMBOL_GPL(security_binder_transfer_file);
 
 int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
 {
Index: linux/kernel/sched/core.c
===================================================================
--- linux.orig/kernel/sched/core.c
+++ linux/kernel/sched/core.c
@@ -3973,6 +3973,7 @@ int can_nice(const struct task_struct *p
 	return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) ||
 		capable(CAP_SYS_NICE));
 }
+EXPORT_SYMBOL_GPL(can_nice);
 
 #ifdef __ARCH_WANT_SYS_NICE