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@@ -0,0 +1,193 @@
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+From: Ben Hutchings <ben@decadent.org.uk>
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+Date: Tue, 26 Jun 2018 16:59:01 +0100
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+Subject: Export symbols needed by Android drivers
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+Bug-Debian: https://bugs.debian.org/901492
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+
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+We want to enable use of the Android ashmem and binder drivers to
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+support Anbox, but they should not be built-in as that would waste
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+resources and increase security attack surface on systems that don't
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+need them.
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+
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+Export the currently un-exported symbols they depend on.
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+
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+---
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+ fs/file.c | 5 +++++
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+ kernel/fork.c | 1 +
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+ kernel/sched/core.c | 1 +
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+ kernel/signal.c | 1 +
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+ kernel/task_work.c | 1 +
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+ mm/memory.c | 1 +
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+ mm/shmem.c | 1 +
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+ mm/vmalloc.c | 2 ++
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+ security/security.c | 4 ++++
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+ 9 files changed, 17 insertions(+)
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+
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+Index: debian-kernel/fs/file.c
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+===================================================================
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+--- debian-kernel.orig/fs/file.c
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++++ debian-kernel/fs/file.c
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+@@ -409,6 +409,7 @@ struct files_struct *get_files_struct(st
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+
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+ return files;
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+ }
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++EXPORT_SYMBOL_GPL(get_files_struct);
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+
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+ void put_files_struct(struct files_struct *files)
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+ {
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+@@ -421,6 +422,7 @@ void put_files_struct(struct files_struc
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+ kmem_cache_free(files_cachep, files);
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+ }
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+ }
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++EXPORT_SYMBOL_GPL(put_files_struct);
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+
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+ void reset_files_struct(struct files_struct *files)
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+ {
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+@@ -534,6 +536,7 @@ out:
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+ spin_unlock(&files->file_lock);
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+ return error;
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+ }
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++EXPORT_SYMBOL_GPL(__alloc_fd);
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+
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+ static int alloc_fd(unsigned start, unsigned flags)
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+ {
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+@@ -612,6 +615,7 @@ void __fd_install(struct files_struct *f
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+ rcu_assign_pointer(fdt->fd[fd], file);
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+ rcu_read_unlock_sched();
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+ }
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++EXPORT_SYMBOL_GPL(__fd_install);
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+
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+ void fd_install(unsigned int fd, struct file *file)
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+ {
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+@@ -676,6 +680,7 @@ out_unlock:
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+ *res = NULL;
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+ return -ENOENT;
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+ }
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++EXPORT_SYMBOL(__close_fd_get_file);
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+
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+ void do_close_on_exec(struct files_struct *files)
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+ {
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+Index: debian-kernel/kernel/fork.c
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+===================================================================
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+--- debian-kernel.orig/kernel/fork.c
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++++ debian-kernel/kernel/fork.c
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+@@ -1131,6 +1131,7 @@ void mmput_async(struct mm_struct *mm)
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+ schedule_work(&mm->async_put_work);
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+ }
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+ }
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++EXPORT_SYMBOL_GPL(mmput_async);
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+ #endif
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+
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+ /**
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+Index: debian-kernel/kernel/sched/core.c
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+===================================================================
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+--- debian-kernel.orig/kernel/sched/core.c
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++++ debian-kernel/kernel/sched/core.c
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+@@ -4667,6 +4667,7 @@ int can_nice(const struct task_struct *p
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+ return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) ||
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+ capable(CAP_SYS_NICE));
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+ }
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++EXPORT_SYMBOL_GPL(can_nice);
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+
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+ #ifdef __ARCH_WANT_SYS_NICE
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+
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+Index: debian-kernel/kernel/signal.c
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+===================================================================
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+--- debian-kernel.orig/kernel/signal.c
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++++ debian-kernel/kernel/signal.c
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+@@ -1396,6 +1396,7 @@ struct sighand_struct *__lock_task_sigha
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+
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+ return sighand;
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+ }
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++EXPORT_SYMBOL_GPL(__lock_task_sighand);
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+
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+ /*
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+ * send signal info to all the members of a group
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+Index: debian-kernel/kernel/task_work.c
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+===================================================================
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+--- debian-kernel.orig/kernel/task_work.c
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++++ debian-kernel/kernel/task_work.c
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+@@ -52,6 +52,7 @@ task_work_add(struct task_struct *task,
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+
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+ return 0;
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+ }
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++EXPORT_SYMBOL(task_work_add);
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+
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+ /**
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+ * task_work_cancel - cancel a pending work added by task_work_add()
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+Index: debian-kernel/mm/memory.c
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+===================================================================
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+--- debian-kernel.orig/mm/memory.c
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++++ debian-kernel/mm/memory.c
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+@@ -1367,6 +1367,7 @@ void zap_page_range(struct vm_area_struc
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+ mmu_notifier_invalidate_range_end(&range);
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+ tlb_finish_mmu(&tlb, start, range.end);
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+ }
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++EXPORT_SYMBOL_GPL(zap_page_range);
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+
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+ /**
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+ * zap_page_range_single - remove user pages in a given range
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+Index: debian-kernel/mm/shmem.c
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+===================================================================
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+--- debian-kernel.orig/mm/shmem.c
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++++ debian-kernel/mm/shmem.c
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+@@ -4158,6 +4158,7 @@ int shmem_zero_setup(struct vm_area_stru
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+
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+ return 0;
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+ }
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++EXPORT_SYMBOL_GPL(shmem_zero_setup);
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+
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+ /**
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+ * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags.
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+Index: debian-kernel/mm/vmalloc.c
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+===================================================================
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+--- debian-kernel.orig/mm/vmalloc.c
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++++ debian-kernel/mm/vmalloc.c
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+@@ -1278,6 +1278,7 @@ overflow:
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+ kmem_cache_free(vmap_area_cachep, va);
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+ return ERR_PTR(-EBUSY);
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+ }
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++EXPORT_SYMBOL_GPL(map_kernel_range_noflush);
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+
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+ int register_vmap_purge_notifier(struct notifier_block *nb)
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+ {
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+@@ -2147,6 +2148,7 @@ struct vm_struct *get_vm_area(unsigned l
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+ NUMA_NO_NODE, GFP_KERNEL,
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+ __builtin_return_address(0));
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+ }
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++EXPORT_SYMBOL_GPL(get_vm_area);
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+
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+ struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
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+ const void *caller)
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+Index: debian-kernel/security/security.c
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+===================================================================
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+--- debian-kernel.orig/security/security.c
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++++ debian-kernel/security/security.c
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+@@ -725,24 +725,28 @@ int security_binder_set_context_mgr(stru
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+ {
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+ return call_int_hook(binder_set_context_mgr, 0, mgr);
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+ }
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++EXPORT_SYMBOL_GPL(security_binder_set_context_mgr);
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+
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+ int security_binder_transaction(struct task_struct *from,
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+ struct task_struct *to)
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+ {
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+ return call_int_hook(binder_transaction, 0, from, to);
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+ }
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++EXPORT_SYMBOL_GPL(security_binder_transaction);
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+
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+ int security_binder_transfer_binder(struct task_struct *from,
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+ struct task_struct *to)
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+ {
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+ return call_int_hook(binder_transfer_binder, 0, from, to);
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+ }
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++EXPORT_SYMBOL_GPL(security_binder_transfer_binder);
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+
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+ int security_binder_transfer_file(struct task_struct *from,
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+ struct task_struct *to, struct file *file)
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+ {
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+ return call_int_hook(binder_transfer_file, 0, from, to, file);
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+ }
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++EXPORT_SYMBOL_GPL(security_binder_transfer_file);
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+
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+ int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
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+ {
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Maximilian Luz