2024-12-10 06:44:25 +03:00
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From b492213c96ded86e7800b320706ad15bd31c7c1b Mon Sep 17 00:00:00 2001
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2024-10-29 05:12:06 +03:00
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From: Christian Brauner <christian@brauner.io>
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Date: Wed, 16 Jan 2019 23:13:25 +0100
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Subject: [PATCH 1/4] binder: turn into module
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The Android binder driver needs to become a module for the sake of shipping
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Anbox. To do this we need to export the following functions since binder is
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currently still using them:
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- security_binder_set_context_mgr()
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- security_binder_transaction()
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- security_binder_transfer_binder()
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- security_binder_transfer_file()
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- can_nice()
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- __close_fd_get_file()
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- mmput_async()
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- task_work_add()
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- map_kernel_range_noflush()
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- get_vm_area()
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- zap_page_range_single()
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- put_ipc_ns()
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- get_ipc_ns_exported()
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- show_init_ipc_ns()
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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
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[ saf: fix additional reference to init_ipc_ns from 5.0-rc6 ]
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Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
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[ arighi: fix EXPORT_SYMBOL vs EXPORT_SYMBOL_GPL change from 6.0-rc5 ]
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[ arighi: zap_page_range() has been dropped, export zap_page_range_single() in 6.3 ]
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Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
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Signed-off-by: Alexandre Frade <kernel@xanmod.org>
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--- a/drivers/android/Kconfig
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+++ b/drivers/android/Kconfig
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@@ -14,8 +14,8 @@ config ANDROID_BINDER_IPC
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between said processes.
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config ANDROID_BINDERFS
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- bool "Android Binderfs filesystem"
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- depends on ANDROID_BINDER_IPC
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+ tristate "Android Binderfs filesystem"
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+ depends on (ANDROID_BINDER_IPC=y) || (ANDROID_BINDER_IPC=m && m)
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default n
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help
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Binderfs is a pseudo-filesystem for the Android Binder IPC driver
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--- a/drivers/android/binder.c
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+++ b/drivers/android/binder.c
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2024-12-10 06:44:25 +03:00
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@@ -7027,9 +7027,20 @@ err_alloc_device_names_failed:
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2024-10-29 05:12:06 +03:00
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return ret;
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}
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-device_initcall(binder_init);
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+module_init(binder_init);
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+/*
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+ * binder will have no exit function since binderfs instances can be mounted
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+ * multiple times and also in user namespaces finding and destroying them all
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+ * is not feasible without introducing insane locking. Just ignoring existing
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+ * instances on module unload also wouldn't work since we would loose track of
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+ * what major numer was dynamically allocated and also what minor numbers are
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+ * already given out. So this would get us into all kinds of issues with device
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+ * number reuse. So simply don't allow unloading unless we are forced to do so.
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+ */
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+
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+MODULE_AUTHOR("Google, Inc.");
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+MODULE_DESCRIPTION("Driver for Android binder device");
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+MODULE_LICENSE("GPL v2");
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#define CREATE_TRACE_POINTS
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#include "binder_trace.h"
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-
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-MODULE_LICENSE("GPL v2");
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--- a/drivers/android/binder_alloc.h
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+++ b/drivers/android/binder_alloc.h
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@@ -6,6 +6,7 @@
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#ifndef _LINUX_BINDER_ALLOC_H
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#define _LINUX_BINDER_ALLOC_H
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+#include <linux/kconfig.h>
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#include <linux/rbtree.h>
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#include <linux/list.h>
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#include <linux/mm.h>
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@@ -111,7 +112,7 @@ struct binder_alloc {
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bool oneway_spam_detected;
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};
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-#ifdef CONFIG_ANDROID_BINDER_IPC_SELFTEST
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+#if IS_ENABLED(CONFIG_ANDROID_BINDER_IPC_SELFTEST)
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void binder_selftest_alloc(struct binder_alloc *alloc);
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#else
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static inline void binder_selftest_alloc(struct binder_alloc *alloc) {}
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--- a/drivers/android/binder_internal.h
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+++ b/drivers/android/binder_internal.h
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@@ -5,6 +5,7 @@
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#include <linux/export.h>
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#include <linux/fs.h>
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+#include <linux/kconfig.h>
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#include <linux/list.h>
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#include <linux/miscdevice.h>
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#include <linux/mutex.h>
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@@ -78,7 +79,7 @@ extern const struct file_operations bind
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extern char *binder_devices_param;
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-#ifdef CONFIG_ANDROID_BINDERFS
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+#if IS_ENABLED(CONFIG_ANDROID_BINDERFS)
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extern bool is_binderfs_device(const struct inode *inode);
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extern struct dentry *binderfs_create_file(struct dentry *dir, const char *name,
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const struct file_operations *fops,
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@@ -99,7 +100,7 @@ static inline struct dentry *binderfs_cr
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static inline void binderfs_remove_file(struct dentry *dentry) {}
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#endif
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-#ifdef CONFIG_ANDROID_BINDERFS
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+#if IS_ENABLED(CONFIG_ANDROID_BINDERFS)
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extern int __init init_binderfs(void);
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#else
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static inline int __init init_binderfs(void)
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--- a/drivers/android/binderfs.c
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+++ b/drivers/android/binderfs.c
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@@ -122,7 +122,7 @@ static int binderfs_binder_device_create
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struct super_block *sb = ref_inode->i_sb;
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struct binderfs_info *info = sb->s_fs_info;
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#if defined(CONFIG_IPC_NS)
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- bool use_reserve = (info->ipc_ns == &init_ipc_ns);
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+ bool use_reserve = (info->ipc_ns == show_init_ipc_ns());
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#else
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bool use_reserve = true;
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#endif
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2024-12-10 06:44:25 +03:00
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@@ -399,7 +399,7 @@ static int binderfs_binder_ctl_create(st
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struct dentry *root = sb->s_root;
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struct binderfs_info *info = sb->s_fs_info;
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#if defined(CONFIG_IPC_NS)
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- bool use_reserve = (info->ipc_ns == &init_ipc_ns);
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+ bool use_reserve = (info->ipc_ns == show_init_ipc_ns());
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#else
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bool use_reserve = true;
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#endif
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2024-12-10 06:44:25 +03:00
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@@ -691,7 +691,7 @@ static int binderfs_fill_super(struct su
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return -ENOMEM;
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info = sb->s_fs_info;
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- info->ipc_ns = get_ipc_ns(current->nsproxy->ipc_ns);
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+ info->ipc_ns = get_ipc_ns_exported(current->nsproxy->ipc_ns);
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info->root_gid = make_kgid(sb->s_user_ns, 0);
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if (!gid_valid(info->root_gid))
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--- a/include/linux/ipc_namespace.h
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+++ b/include/linux/ipc_namespace.h
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@@ -128,6 +128,9 @@ extern int mq_init_ns(struct ipc_namespa
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static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
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#endif
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+extern struct ipc_namespace *get_ipc_ns_exported(struct ipc_namespace *ns);
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+extern struct ipc_namespace *show_init_ipc_ns(void);
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+
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#if defined(CONFIG_IPC_NS)
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extern struct ipc_namespace *copy_ipcs(unsigned long flags,
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struct user_namespace *user_ns, struct ipc_namespace *ns);
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--- a/ipc/namespace.c
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+++ b/ipc/namespace.c
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2024-12-05 18:46:18 +03:00
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@@ -209,6 +209,22 @@ void put_ipc_ns(struct ipc_namespace *ns
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}
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EXPORT_SYMBOL_GPL(put_ipc_ns);
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+struct ipc_namespace *get_ipc_ns_exported(struct ipc_namespace *ns)
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+{
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+ return get_ipc_ns(ns);
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+}
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+EXPORT_SYMBOL(get_ipc_ns_exported);
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+
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+struct ipc_namespace *show_init_ipc_ns(void)
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+{
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+#if defined(CONFIG_IPC_NS)
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+ return &init_ipc_ns;
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+#else
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+ return NULL;
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+#endif
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+}
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+EXPORT_SYMBOL(show_init_ipc_ns);
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+
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static inline struct ipc_namespace *to_ipc_ns(struct ns_common *ns)
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{
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return container_of(ns, struct ipc_namespace, ns);
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--- a/mm/vmalloc.c
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+++ b/mm/vmalloc.c
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@@ -3176,6 +3176,7 @@ 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(get_vm_area);
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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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