diff options
author | Carlos Llamas <cmllamas@google.com> | 2021-07-15 06:18:03 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-21 14:46:36 +0300 |
commit | fc470abf54b2bd6e539065e07905e767b443d719 (patch) | |
tree | ac746b9cd1efba812b39a1abbea55e0cf05e0f0e /drivers | |
parent | ec7b5eda8ae1a7a12cf1618ad7afb3509f593812 (diff) | |
download | linux-fc470abf54b2bd6e539065e07905e767b443d719.tar.xz |
binderfs: add support for feature files
Provide userspace with a mechanism to discover features supported by
the binder driver to refrain from using any unsupported ones in the
first place. Starting with "oneway_spam_detection" only new features
are to be listed under binderfs and all previous ones are assumed to
be supported.
Assuming an instance of binderfs has been mounted at /dev/binderfs,
binder feature files can be found under /dev/binderfs/features/.
Usage example:
$ mkdir /dev/binderfs
$ mount -t binder binder /dev/binderfs
$ cat /dev/binderfs/features/oneway_spam_detection
1
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20210715031805.1725878-1-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/android/binderfs.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c index e80ba93c62a9..e3605cdd4335 100644 --- a/drivers/android/binderfs.c +++ b/drivers/android/binderfs.c @@ -58,6 +58,10 @@ enum binderfs_stats_mode { binderfs_stats_mode_global, }; +struct binder_features { + bool oneway_spam_detection; +}; + static const struct constant_table binderfs_param_stats[] = { { "global", binderfs_stats_mode_global }, {} @@ -69,6 +73,10 @@ static const struct fs_parameter_spec binderfs_fs_parameters[] = { {} }; +static struct binder_features binder_features = { + .oneway_spam_detection = true, +}; + static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb) { return sb->s_fs_info; @@ -583,6 +591,33 @@ out: return dentry; } +static int binder_features_show(struct seq_file *m, void *unused) +{ + bool *feature = m->private; + + seq_printf(m, "%d\n", *feature); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(binder_features); + +static int init_binder_features(struct super_block *sb) +{ + struct dentry *dentry, *dir; + + dir = binderfs_create_dir(sb->s_root, "features"); + if (IS_ERR(dir)) + return PTR_ERR(dir); + + dentry = binderfs_create_file(dir, "oneway_spam_detection", + &binder_features_fops, + &binder_features.oneway_spam_detection); + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + + return 0; +} + static int init_binder_logs(struct super_block *sb) { struct dentry *binder_logs_root_dir, *dentry, *proc_log_dir; @@ -723,6 +758,10 @@ static int binderfs_fill_super(struct super_block *sb, struct fs_context *fc) name++; } + ret = init_binder_features(sb); + if (ret) + return ret; + if (info->mount_opts.stats_mode == binderfs_stats_mode_global) return init_binder_logs(sb); |