From: Ben Hutchings <ben@decadent.org.uk>
Date: Mon, 07 Sep 2020 02:51:53 +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.

---
 fs/file.c           | 1 +
 kernel/sched/core.c | 1 +
 kernel/sched/wait.c | 1 +
 kernel/task_work.c  | 1 +
 mm/memory.c         | 1 +
 mm/shmem.c          | 1 +
 security/security.c | 4 ++++
 7 files changed, 10 insertions(+)

--- a/fs/file.c
+++ b/fs/file.c
@@ -816,6 +816,7 @@ struct file *close_fd_get_file(unsigned
 
 	return file;
 }
+EXPORT_SYMBOL_GPL(close_fd_get_file);
 
 void do_close_on_exec(struct files_struct *files)
 {
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7253,6 +7253,7 @@ static bool is_nice_reduction(const stru
 
 	return (nice_rlim <= task_rlimit(p, RLIMIT_NICE));
 }
+EXPORT_SYMBOL_GPL(can_nice);
 
 /*
  * can_nice - check if a task can reduce its nice value
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c
@@ -252,6 +252,7 @@ void __wake_up_pollfree(struct wait_queu
 	/* POLLFREE must have cleared the queue. */
 	WARN_ON_ONCE(waitqueue_active(wq_head));
 }
+EXPORT_SYMBOL_GPL(__wake_up_pollfree);
 
 /*
  * Note: we use "set_current_state()" _after_ the wait-queue add,
--- a/kernel/task_work.c
+++ b/kernel/task_work.c
@@ -73,6 +73,7 @@ int task_work_add(struct task_struct *ta
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(task_work_add);
 
 /**
  * task_work_cancel_match - cancel a pending work added by task_work_add()
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1770,6 +1770,7 @@ void zap_page_range_single(struct vm_area_struc
 	tlb_finish_mmu(&tlb);
 	hugetlb_zap_end(vma, details);
 }
+EXPORT_SYMBOL_GPL(zap_page_range_single);
 
 /**
  * zap_vma_ptes - remove ptes mapping the vma
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4871,6 +4871,7 @@ int shmem_zero_setup(struct vm_area_stru
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(shmem_zero_setup);
 
 /**
  * shmem_read_folio_gfp - read into page cache, using specified page allocation flags.
--- a/security/security.c
+++ b/security/security.c
@@ -799,6 +799,7 @@ int security_binder_set_context_mgr(const struct cred *mgr)
 {
 	return call_int_hook(binder_set_context_mgr, 0, mgr);
 }
+EXPORT_SYMBOL_GPL(security_binder_set_context_mgr);

 /**
  * security_binder_transaction() - Check if a binder transaction is allowed
@@ -814,6 +815,7 @@ int security_binder_transaction(const struct cred *from,
 {
 	return call_int_hook(binder_transaction, 0, from, to);
 }
+EXPORT_SYMBOL_GPL(security_binder_transaction);

 /**
  * security_binder_transfer_binder() - Check if a binder transfer is allowed
@@ -829,6 +831,7 @@ int security_binder_transfer_binder(const struct cred *from,
 {
 	return call_int_hook(binder_transfer_binder, 0, from, to);
 }
+EXPORT_SYMBOL_GPL(security_binder_transfer_binder);

 /**
  * security_binder_transfer_file() - Check if a binder file xfer is allowed
@@ -845,6 +848,7 @@ int security_binder_transfer_file(const struct cred *from,
 {
 	return call_int_hook(binder_transfer_file, 0, from, to, file);
 }
+EXPORT_SYMBOL_GPL(security_binder_transfer_file);

 /**
  * security_ptrace_access_check() - Check if tracing is allowed