dev_binderfs.txt

# Copyright 2021 syzkaller project authors. All rights reserved.
# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.

include <linux/fcntl.h>
include <linux/unistd.h>
include <linux/android/binderfs.h>

# ./binderfs will be mounted by syz-executor, but let's also see how a single process
# operates with multiple ones.
binderfs_mountpoint = "./binderfs", "./binderfs2"

# Control paths.
binderfs_ctrlpath = "./binderfs/binder-control", "./binderfs2/binder-control"

# Device names.
binderfs_devname = "binder0", "binder1", "custom0", "custom1"

# Unfortunately, syzlang does not currently favor string concatenation for open (and related) syscalls. So we concatenate it manually.
binderfs_devpath = "./binderfs/binder0", "./binderfs/binder1", "./binderfs/custom0", "./binderfs/custom1", "./binderfs2/binder0", "./binderfs2/binder1", "./binderfs2/custom0", "./binderfs2/custom1"

mkdirat$binderfs(fd const[AT_FDCWD], path ptr[in, string[binderfs_mountpoint]], mode const[0x1ff])
mount$binderfs(src ptr[in, string["binder"]], dst ptr[in, string[binderfs_mountpoint]], type ptr[in, string["binder"]], flags flags[mount_flags], opts ptr[in, fs_options[binderfs_options]])
unlinkat$binderfs_device(fd const[AT_FDCWD], path ptr[in, string[binderfs_devpath]])

binderfs_options [
	max	fs_opt_oct["max", int32]
	stats	stringnoz["stats=global"]
] [varlen]

define BINDERFS_NAME_LEN	BINDERFS_MAX_NAME + 1

binderfs_device {
	name	string[binderfs_devname, BINDERFS_NAME_LEN]	(in)
	major	int32	(out)
	minor	int32	(out)
}

resource fd_binderfs_ctrl[fd]
openat$binderfs_ctrl(fd const[AT_FDCWD], file ptr[in, string[binderfs_ctrlpath]], flags flags[binder_open_flags], mode const[0]) fd_binderfs_ctrl
ioctl$BINDER_CTL_ADD(fd fd_binderfs_ctrl, cmd const[BINDER_CTL_ADD], arg ptr[inout, binderfs_device])