From ac62e511c4d4e90a12a16f9605e51211e3769748 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@decadent.org.uk>
Date: Mon, 7 Sep 2020 02:51:53 +0100
Subject: [PATCH] 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.


Gbp-Pq: Topic debian
Gbp-Pq: Name export-symbols-needed-by-android-drivers.patch
---
 fs/file.c           | 1 +
 kernel/fork.c       | 1 +
 kernel/sched/core.c | 1 +
 kernel/task_work.c  | 1 +
 mm/memory.c         | 1 +
 mm/shmem.c          | 1 +
 security/security.c | 4 ++++
 7 files changed, 10 insertions(+)

diff --git a/fs/file.c b/fs/file.c
index 4559b5fec3b..af2c7e3169f 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -782,6 +782,7 @@ out_unlock:
 	*res = NULL;
 	return -ENOENT;
 }
+EXPORT_SYMBOL(__close_fd_get_file);
 
 void do_close_on_exec(struct files_struct *files)
 {
diff --git a/kernel/fork.c b/kernel/fork.c
index dc55f68a6ee..c162f46a35e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1118,6 +1118,7 @@ void mmput_async(struct mm_struct *mm)
 		schedule_work(&mm->async_put_work);
 	}
 }
+EXPORT_SYMBOL_GPL(mmput_async);
 #endif
 
 /**
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 77aa0e788b9..98ae3174e68 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5022,6 +5022,7 @@ int can_nice(const struct task_struct *p, const int nice)
 	return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) ||
 		capable(CAP_SYS_NICE));
 }
+EXPORT_SYMBOL_GPL(can_nice);
 
 #ifdef __ARCH_WANT_SYS_NICE
 
diff --git a/kernel/task_work.c b/kernel/task_work.c
index 8d6e1217c45..7cf8f9a6b64 100644
--- a/kernel/task_work.c
+++ b/kernel/task_work.c
@@ -68,6 +68,7 @@ int task_work_add(struct task_struct *task, struct callback_head *work,
 
 	return 0;
 }
+EXPORT_SYMBOL(task_work_add);
 
 /**
  * task_work_cancel - cancel a pending work added by task_work_add()
diff --git a/mm/memory.c b/mm/memory.c
index 50632c4366b..82a13bc3971 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1542,6 +1542,7 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
 	mmu_notifier_invalidate_range_end(&range);
 	tlb_finish_mmu(&tlb, start, range.end);
 }
+EXPORT_SYMBOL_GPL(zap_page_range);
 
 /**
  * zap_page_range_single - remove user pages in a given range
diff --git a/mm/shmem.c b/mm/shmem.c
index 537c137698f..387f5869491 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4288,6 +4288,7 @@ int shmem_zero_setup(struct vm_area_struct *vma)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(shmem_zero_setup);
 
 /**
  * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags.
diff --git a/security/security.c b/security/security.c
index a28045dc9e7..5e35ba58540 100644
--- a/security/security.c
+++ b/security/security.c
@@ -726,24 +726,28 @@ int security_binder_set_context_mgr(struct task_struct *mgr)
 {
 	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)
 {
-- 
2.30.2