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// Copyright 2025 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.
package fuzzconfig
import (
_ "embed"
"encoding/json"
"fmt"
"github.com/google/syzkaller/pkg/config"
"github.com/google/syzkaller/pkg/mgrconfig"
"github.com/google/syzkaller/syz-cluster/pkg/api"
)
//go:embed base.cfg
var baseConfigJSON []byte
//go:embed patched.cfg
var patchedConfigJSON []byte
// GenerateBase produces a syz-manager config for the base kernel.
// The caller must still invoke mgrconfig.Complete.
func GenerateBase(cfg *api.FuzzConfig) (*mgrconfig.Config, error) {
var baseRaw json.RawMessage
err := config.LoadData(baseConfigJSON, &baseRaw)
if err != nil {
return nil, fmt.Errorf("failed to read the base config: %w", err)
}
base, err := mgrconfig.LoadPartialData(baseRaw)
if err != nil {
return nil, fmt.Errorf("failed to load the config: %w", err)
}
err = applyFuzzConfig(base, cfg)
if err != nil {
return nil, err
}
return base, nil
}
// GeneratePatched produces a syz-manager config for the base kernel.
// The caller must still invoke mgrconfig.Complete.
func GeneratePatched(cfg *api.FuzzConfig) (*mgrconfig.Config, error) {
var baseRaw, deltaRaw json.RawMessage
err := config.LoadData(baseConfigJSON, &baseRaw)
if err != nil {
return nil, fmt.Errorf("failed to read the base config: %w", err)
}
err = config.LoadData(patchedConfigJSON, &deltaRaw)
if err != nil {
return nil, fmt.Errorf("failed to read the patched config: %w", err)
}
patchedRaw, err := config.MergeJSONs(baseRaw, deltaRaw)
if err != nil {
return nil, fmt.Errorf("failed to merge the configs: %w", err)
}
patched, err := mgrconfig.LoadPartialData(patchedRaw)
if err != nil {
return nil, fmt.Errorf("failed to load the config: %w", err)
}
err = applyFuzzConfig(patched, cfg)
if err != nil {
return nil, err
}
return patched, nil
}
func applyFuzzConfig(mgrCfg *mgrconfig.Config, cfg *api.FuzzConfig) error {
if len(cfg.Focus) == 0 {
noFocus(mgrCfg)
return nil
}
for _, focus := range cfg.Focus {
cb := setFocus[focus]
if cb == nil {
return fmt.Errorf("unknown focus: %s", focus)
}
err := cb(mgrCfg)
if err != nil {
return fmt.Errorf("failed to apply focus %s: %w", focus, err)
}
}
return nil
}
// nolint: lll
var setFocus = map[string]func(*mgrconfig.Config) error{
api.FocusKVM: func(mgrCfg *mgrconfig.Config) error {
mgrCfg.EnabledSyscalls = append(mgrCfg.EnabledSyscalls,
"openat$kvm",
"openat$sev",
"close",
"ioctl$KVM*",
"syz_kvm*",
"mmap$KVM_VCPU",
"munmap",
"syz_memcpy_off$KVM_EXIT_MMIO",
"syz_memcpy_off$KVM_EXIT_HYPERCALL",
"eventfd2",
"write$eventfd",
)
var err error
mgrCfg.VM, err = config.MergeJSONs(mgrCfg.VM, []byte(
`{"qemu_args": "-machine q35,nvdimm=on,accel=kvm,kernel-irqchip=split -cpu max,migratable=off -enable-kvm -smp 2,sockets=2,cores=1"}`))
return err
},
api.FocusNet: func(mgrCfg *mgrconfig.Config) error {
mgrCfg.EnabledSyscalls = append(mgrCfg.EnabledSyscalls,
"accept", "accept4", "bind", "close", "connect", "epoll_create",
"epoll_create1", "epoll_ctl", "epoll_pwait", "epoll_wait",
"getpeername", "getsockname", "getsockopt", "ioctl", "listen",
"mmap", "poll", "ppoll", "pread64", "preadv", "pselect6",
"pwrite64", "pwritev", "read", "readv", "recvfrom", "recvmmsg",
"recvmsg", "select", "sendfile", "sendmmsg", "sendmsg", "sendto",
"setsockopt", "shutdown", "socket", "socketpair", "splice",
"vmsplice", "write", "writev", "tee", "bpf", "getpid",
"getgid", "getuid", "gettid", "unshare", "pipe",
"syz_emit_ethernet", "syz_extract_tcp_res",
"syz_genetlink_get_family_id", "syz_init_net_socket",
"mkdirat$cgroup*", "openat$cgroup*", "write$cgroup*",
"clock_gettime", "bpf", "openat$tun", "openat$ppp",
"syz_open_procfs$namespace", "syz_80211_*", "nanosleep",
"openat$nci", "ioctl$IOCTL_GET_NCIDEV_IDX", "openat$rfkill",
"openat$6lowpan*", "openat$pidfd", "openat$tcp*", "openat$vhost_vsock",
"openat$ptp*", "ioctl$PTP*",
)
return nil
},
api.FocusFS: func(mgrCfg *mgrconfig.Config) error {
mgrCfg.EnabledSyscalls = append(mgrCfg.EnabledSyscalls,
"syz_mount_image", "open", "openat", "creat", "close", "read",
"pread64", "readv", "preadv", "preadv2", "write", "pwrite64",
"writev", "pwritev", "pwritev2", "lseek", "copy_file_range", "dup",
"dup2", "dup3", "tee", "splice", "vmsplice", "sendfile", "stat",
"lstat", "fstat", "newfstatat", "statx", "poll", "clock_gettime",
"ppoll", "select", "pselect6", "epoll_create", "epoll_create1",
"epoll_ctl", "epoll_wait", "epoll_pwait", "epoll_pwait2", "mmap",
"munmap", "mremap", "msync", "readahead", "fcntl", "mknod", "mknodat",
"chmod", "fchmod", "fchmodat", "chown", "lchown", "fchown",
"fchownat", "fallocate", "faccessat", "faccessat2", "utime", "utimes",
"futimesat", "utimensat", "link", "linkat", "symlinkat", "symlink",
"unlink", "unlinkat", "readlink", "readlinkat", "rename", "renameat",
"renameat2", "mkdir", "mkdirat", "rmdir", "truncate", "ftruncate",
"flock", "fsync", "fdatasync", "sync", "syncfs", "sync_file_range",
"getdents", "getdents64", "name_to_handle_at", "open_by_handle_at",
"chroot", "getcwd", "chdir", "fchdir", "quotactl", "pivot_root",
"statfs", "fstatfs", "syz_open_procfs", "syz_read_part_table",
"mount", "fsopen", "fspick", "fsconfig", "fsmount", "move_mount",
"open_tree", "mount_setattr", "ioctl$FS_*", "ioctl$BTRFS*",
"ioctl$AUTOFS*", "ioctl$EXT4*", "ioctl$F2FS*", "ioctl$FAT*",
"ioctl$VFAT*", "ioctl$FI*",
)
mgrCfg.NoMutateSyscalls = append(mgrCfg.NoMutateSyscalls,
"syz_mount_image$btrfs",
"syz_mount_image$ext4",
"syz_mount_image$f2fs",
"syz_mount_image$ntfs",
"syz_mount_image$ocfs2",
"syz_mount_image$xfs",
)
return nil
},
api.FocusIoUring: func(mgrCfg *mgrconfig.Config) error {
mgrCfg.EnabledSyscalls = append(mgrCfg.EnabledSyscalls,
"io_uring_*", "syz_io_uring_*", "syz_memcpy_off", "mmap", "madvise",
"mprotect", "eventfd", "socket", "setsockopt", "accept", "open", "close",
"clock_gettime", "ioctl$sock_SIOCGIFINDEX", "ioctl$IOCTL_GET_NCIDEV_IDX",
"openat", "epoll_create",
)
return nil
},
api.FocusBPF: func(mgrCfg *mgrconfig.Config) error {
mgrCfg.EnabledSyscalls = append(mgrCfg.EnabledSyscalls,
"bpf", "mkdir", "mount$bpf", "unlink", "close",
"perf_event_open*", "ioctl$PERF*", "getpid", "gettid",
"socketpair", "sendmsg", "recvmsg", "setsockopt$sock_attach_bpf",
"socket", "ioctl$sock_kcm*", "syz_clone",
"mkdirat$cgroup*", "openat$cgroup*", "write$cgroup*",
"openat$tun", "write$tun", "ioctl$TUN*", "ioctl$SIOCSIFHWADDR",
"openat$ppp", "syz_open_procfs$namespace", "openat$pidfd", "fstat",
)
return nil
},
}
func noFocus(mgrCfg *mgrconfig.Config) {
mgrCfg.DisabledSyscalls = []string{"perf_event_open*", "syz_mount_image$hfs", "syz_mount_image$gfs*"}
}
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