Currently, we step into drivers/hid/ based on the value of CONFIG_HID.

However, that value is a tristate, meaning that it can be a module.

As per the documentation, if we jump into the subdirectory by following an obj-m, we can not compile anything inside that subdirectory in vmlinux. It is considered as a bug.

To make things more friendly to HID-BPF, split HID (the HID core parameter) from HID_SUPPORT (do we want any kind of HID support in the system?), and make this new config a boolean.

Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

---

no changes in v11

no changes in v10

no changes in v9

no changes in v8

new in v7 --- drivers/Makefile | 2 +- drivers/hid/Kconfig | 20 +++++++++++--------- 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/Makefile b/drivers/Makefile index bdf1c66141c9..cf5d8b86da8f 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -137,7 +137,7 @@ obj-$(CONFIG_CRYPTO) += crypto/ obj-$(CONFIG_SUPERH) += sh/ obj-y += clocksource/ obj-$(CONFIG_DCA) += dca/ -obj-$(CONFIG_HID) += hid/ +obj-$(CONFIG_HID_SUPPORT) += hid/ obj-$(CONFIG_PPC_PS3) += ps3/ obj-$(CONFIG_OF) += of/ obj-$(CONFIG_SSB) += ssb/ diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index 185a077d59cd..ad767955ee62 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -2,12 +2,18 @@ # # HID driver configuration # -menu "HID support" - depends on INPUT +menuconfig HID_SUPPORT + bool "HID bus support" + default y + depends on INPUT + help + This option adds core support for human interface device (HID). + You will also need drivers from the following menu to make use of it. + +if HID_SUPPORT

config HID - tristate "HID bus support" - depends on INPUT + tristate "HID bus core support" default y help A human interface device (HID) is a type of computer device that @@ -24,8 +30,6 @@ config HID

If unsure, say Y.

-if HID - config HID_BATTERY_STRENGTH bool "Battery level reporting for HID devices" select POWER_SUPPLY @@ -1278,8 +1282,6 @@ config HID_KUNIT_TEST

endmenu

-endif # HID - source "drivers/hid/usbhid/Kconfig"

source "drivers/hid/i2c-hid/Kconfig" @@ -1290,4 +1292,4 @@ source "drivers/hid/amd-sfh-hid/Kconfig"

source "drivers/hid/surface-hid/Kconfig"

-endmenu +endif # HID_SUPPORT

Declare an entry point that can use fmod_ret BPF programs, and also an API to access and change the incoming data.

A simpler implementation would consist in just calling hid_bpf_device_event() for any incoming event and let users deal with the fact that they will be called for any event of any device.

The goal of HID-BPF is to partially replace drivers, so this situation can be problematic because we might have programs which will step on each other toes.

For that, we add a new API hid_bpf_attach_prog() that can be called from a syscall and we manually deal with a jump table in hid-bpf.

Whenever we add a program to the jump table (in other words, when we attach a program to a HID device), we keep the number of time we added this program in the jump table so we can release it whenever there are no other users.

HID devices have an RCU protected list of available programs in the jump table, and those programs are called one after the other thanks to bpf_tail_call().

To achieve the detection of users losing their fds on the programs we attached, we add 2 tracing facilities on bpf_prog_release() (for when a fd is closed) and bpf_free_inode() (for when a pinned program gets unpinned).

Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

---

changes in v11: - fix unresolved symbol hid_bpf_ops as Reported-by: kernel test robot lkp@intel.com

no changes in v10

changes in v9: - fixed the kfunc declaration according to the latest upstream changes - tiny change in the SPDX header of include/linux/hid_bpf.h - removal of one obsolete comment in drivers/hid/bpf/Kconfig

no changes in v8

changes in v7: - generate the entrypoints bpf lskel through bootstrop of bpftool for efficiency - fix warning detected by kernel test robot lkp@intel.com where CONFIG_BPF was used instead of CONFIG_HID_BPF - declare __hid_bpf_tail_call in hid_bpf.h to shut up warning - fix static declarations of __init and __exit functions - changed the default Kconfig to be `default HID_SUPPORT` and do not select HID

changes in v6: - use BTF_ID to get the btf_id of hid_bpf_device_event instead of loading/unloading a dummy eBPF program.

changes in v5: - all the HID bpf operations are in their dedicated module - a bpf program is preloaded on startup so we can call subsequent calls with bpf_tail_call - make hid_bpf_ctx more compact - add a dedicated hid_bpf_attach_prog() API - store the list of progs in each hdev - monitor the calls to bpf_prog_release to automatically release attached progs when there are no other users - add kernel docs directly when functions are defined

new-ish in v4: - far from complete, but gives an overview of what we can do now. --- drivers/hid/Kconfig | 2 + drivers/hid/Makefile | 2 + drivers/hid/bpf/Kconfig | 17 + drivers/hid/bpf/Makefile | 11 + drivers/hid/bpf/entrypoints/Makefile | 93 +++ drivers/hid/bpf/entrypoints/README | 4 + drivers/hid/bpf/entrypoints/entrypoints.bpf.c | 66 ++ .../hid/bpf/entrypoints/entrypoints.lskel.h | 682 ++++++++++++++++++ drivers/hid/bpf/hid_bpf_dispatch.c | 223 ++++++ drivers/hid/bpf/hid_bpf_dispatch.h | 27 + drivers/hid/bpf/hid_bpf_jmp_table.c | 568 +++++++++++++++ drivers/hid/hid-core.c | 19 + include/linux/hid.h | 5 + include/linux/hid_bpf.h | 102 +++ include/uapi/linux/hid_bpf.h | 25 + tools/include/uapi/linux/hid.h | 62 ++ tools/include/uapi/linux/hid_bpf.h | 25 + 17 files changed, 1933 insertions(+) create mode 100644 drivers/hid/bpf/Kconfig create mode 100644 drivers/hid/bpf/Makefile create mode 100644 drivers/hid/bpf/entrypoints/Makefile create mode 100644 drivers/hid/bpf/entrypoints/README create mode 100644 drivers/hid/bpf/entrypoints/entrypoints.bpf.c create mode 100644 drivers/hid/bpf/entrypoints/entrypoints.lskel.h create mode 100644 drivers/hid/bpf/hid_bpf_dispatch.c create mode 100644 drivers/hid/bpf/hid_bpf_dispatch.h create mode 100644 drivers/hid/bpf/hid_bpf_jmp_table.c create mode 100644 include/linux/hid_bpf.h create mode 100644 include/uapi/linux/hid_bpf.h create mode 100644 tools/include/uapi/linux/hid.h create mode 100644 tools/include/uapi/linux/hid_bpf.h

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index ad767955ee62..5961c0d8f38b 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -1282,6 +1282,8 @@ config HID_KUNIT_TEST

endmenu

+source "drivers/hid/bpf/Kconfig" + source "drivers/hid/usbhid/Kconfig"

source "drivers/hid/i2c-hid/Kconfig" diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile index e8014c1a2f8b..c45b516eb767 100644 --- a/drivers/hid/Makefile +++ b/drivers/hid/Makefile @@ -5,6 +5,8 @@ hid-y := hid-core.o hid-input.o hid-quirks.o hid-$(CONFIG_DEBUG_FS) += hid-debug.o

+obj-$(CONFIG_HID_BPF) += bpf/ + obj-$(CONFIG_HID) += hid.o obj-$(CONFIG_UHID) += uhid.o

diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig new file mode 100644 index 000000000000..298634fc3335 --- /dev/null +++ b/drivers/hid/bpf/Kconfig @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "HID-BPF support" + +config HID_BPF + bool "HID-BPF support" + default HID_SUPPORT + depends on BPF && BPF_SYSCALL + help + This option allows to support eBPF programs on the HID subsystem. + eBPF programs can fix HID devices in a lighter way than a full + kernel patch and allow a lot more flexibility. + + For documentation, see Documentation/hid/hid-bpf.rst + + If unsure, say Y. + +endmenu diff --git a/drivers/hid/bpf/Makefile b/drivers/hid/bpf/Makefile new file mode 100644 index 000000000000..cf55120cf7d6 --- /dev/null +++ b/drivers/hid/bpf/Makefile @@ -0,0 +1,11 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for HID-BPF +# + +LIBBPF_INCLUDE = $(srctree)/tools/lib + +obj-$(CONFIG_HID_BPF) += hid_bpf.o +CFLAGS_hid_bpf_dispatch.o += -I$(LIBBPF_INCLUDE) +CFLAGS_hid_bpf_jmp_table.o += -I$(LIBBPF_INCLUDE) +hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_jmp_table.o diff --git a/drivers/hid/bpf/entrypoints/Makefile b/drivers/hid/bpf/entrypoints/Makefile new file mode 100644 index 000000000000..a12edcfa4fe3 --- /dev/null +++ b/drivers/hid/bpf/entrypoints/Makefile @@ -0,0 +1,93 @@ +# SPDX-License-Identifier: GPL-2.0 +OUTPUT := .output +abs_out := $(abspath $(OUTPUT)) + +CLANG ?= clang +LLC ?= llc +LLVM_STRIP ?= llvm-strip + +TOOLS_PATH := $(abspath ../../../../tools) +BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool +BPFTOOL_OUTPUT := $(abs_out)/bpftool +DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool +BPFTOOL ?= $(DEFAULT_BPFTOOL) + +LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf +LIBBPF_OUTPUT := $(abs_out)/libbpf +LIBBPF_DESTDIR := $(LIBBPF_OUTPUT) +LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include +BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a + +INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi +CFLAGS := -g -Wall + +VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \ + $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ + ../../../../vmlinux \ + /sys/kernel/btf/vmlinux \ + /boot/vmlinux-$(shell uname -r) +VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) +ifeq ($(VMLINUX_BTF),) +$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)") +endif + +ifeq ($(V),1) +Q = +msg = +else +Q = @ +msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))"; +MAKEFLAGS += --no-print-directory +submake_extras := feature_display=0 +endif + +.DELETE_ON_ERROR: + +.PHONY: all clean + +all: entrypoints.lskel.h + +clean: + $(call msg,CLEAN) + $(Q)rm -rf $(OUTPUT) entrypoints + +entrypoints.lskel.h: $(OUTPUT)/entrypoints.bpf.o | $(BPFTOOL) + $(call msg,GEN-SKEL,$@) + $(Q)$(BPFTOOL) gen skeleton -L $< > $@ + + +$(OUTPUT)/entrypoints.bpf.o: entrypoints.bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT) + $(call msg,BPF,$@) + $(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES) \ + -c $(filter %.c,$^) -o $@ && \ + $(LLVM_STRIP) -g $@ + +$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR) +ifeq ($(VMLINUX_H),) + $(call msg,GEN,,$@) + $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ +else + $(call msg,CP,,$@) + $(Q)cp "$(VMLINUX_H)" $@ +endif + +$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT): + $(call msg,MKDIR,$@) + $(Q)mkdir -p $@ + +$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT) + $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \ + OUTPUT=$(abspath $(dir $@))/ prefix= \ + DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers + +ifeq ($(CROSS_COMPILE),) +$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT) + $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \ + OUTPUT=$(BPFTOOL_OUTPUT)/ \ + LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/ \ + LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap +else +$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT) + $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \ + OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap +endif diff --git a/drivers/hid/bpf/entrypoints/README b/drivers/hid/bpf/entrypoints/README new file mode 100644 index 000000000000..147e0d41509f --- /dev/null +++ b/drivers/hid/bpf/entrypoints/README @@ -0,0 +1,4 @@ +WARNING: +If you change "entrypoints.bpf.c" do "make -j" in this directory to rebuild "entrypoints.skel.h". +Make sure to have clang 10 installed. +See Documentation/bpf/bpf_devel_QA.rst diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c new file mode 100644 index 000000000000..41dd66d5fc7a --- /dev/null +++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2022 Benjamin Tissoires */ + +#include ".output/vmlinux.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +#define HID_BPF_MAX_PROGS 1024 + +extern bool call_hid_bpf_prog_release(u64 prog, int table_cnt) __ksym; + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(max_entries, HID_BPF_MAX_PROGS); + __uint(key_size, sizeof(__u32)); + __uint(value_size, sizeof(__u32)); +} hid_jmp_table SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __uint(max_entries, HID_BPF_MAX_PROGS * HID_BPF_PROG_TYPE_MAX); + __type(key, void *); + __type(value, __u8); +} progs_map SEC(".maps"); + +SEC("fmod_ret/__hid_bpf_tail_call") +int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx) +{ + bpf_tail_call(ctx, &hid_jmp_table, hctx->index); + + return 0; +} + +static void release_prog(u64 prog) +{ + u8 *value; + + value = bpf_map_lookup_elem(&progs_map, &prog); + if (!value) + return; + + if (call_hid_bpf_prog_release(prog, *value)) + bpf_map_delete_elem(&progs_map, &prog); +} + +SEC("fexit/bpf_prog_release") +int BPF_PROG(hid_prog_release, struct inode *inode, struct file *filp) +{ + u64 prog = (u64)filp->private_data; + + release_prog(prog); + + return 0; +} + +SEC("fexit/bpf_free_inode") +int BPF_PROG(hid_free_inode, struct inode *inode) +{ + u64 prog = (u64)inode->i_private; + + release_prog(prog); + + return 0; +} + +char LICENSE[] SEC("license") = "GPL"; diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h new file mode 100644 index 000000000000..d6a6045a06fe --- /dev/null +++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h @@ -0,0 +1,682 @@ +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ +/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */ +#ifndef __ENTRYPOINTS_BPF_SKEL_H__ +#define __ENTRYPOINTS_BPF_SKEL_H__ + +#include <bpf/skel_internal.h> + +struct entrypoints_bpf { + struct bpf_loader_ctx ctx; + struct { + struct bpf_map_desc hid_jmp_table; + struct bpf_map_desc progs_map; + } maps; + struct { + struct bpf_prog_desc hid_tail_call; + struct bpf_prog_desc hid_prog_release; + struct bpf_prog_desc hid_free_inode; + } progs; + struct { + int hid_tail_call_fd; + int hid_prog_release_fd; + int hid_free_inode_fd; + } links; +}; + +static inline int +entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel) +{ + int prog_fd = skel->progs.hid_tail_call.prog_fd; + int fd = skel_raw_tracepoint_open(NULL, prog_fd); + + if (fd > 0) + skel->links.hid_tail_call_fd = fd; + return fd; +} + +static inline int +entrypoints_bpf__hid_prog_release__attach(struct entrypoints_bpf *skel) +{ + int prog_fd = skel->progs.hid_prog_release.prog_fd; + int fd = skel_raw_tracepoint_open(NULL, prog_fd); + + if (fd > 0) + skel->links.hid_prog_release_fd = fd; + return fd; +} + +static inline int +entrypoints_bpf__hid_free_inode__attach(struct entrypoints_bpf *skel) +{ + int prog_fd = skel->progs.hid_free_inode.prog_fd; + int fd = skel_raw_tracepoint_open(NULL, prog_fd); + + if (fd > 0) + skel->links.hid_free_inode_fd = fd; + return fd; +} + +static inline int +entrypoints_bpf__attach(struct entrypoints_bpf *skel) +{ + int ret = 0; + + ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel); + ret = ret < 0 ? ret : entrypoints_bpf__hid_prog_release__attach(skel); + ret = ret < 0 ? ret : entrypoints_bpf__hid_free_inode__attach(skel); + return ret < 0 ? ret : 0; +} + +static inline void +entrypoints_bpf__detach(struct entrypoints_bpf *skel) +{ + skel_closenz(skel->links.hid_tail_call_fd); + skel_closenz(skel->links.hid_prog_release_fd); + skel_closenz(skel->links.hid_free_inode_fd); +} +static void +entrypoints_bpf__destroy(struct entrypoints_bpf *skel) +{ + if (!skel) + return; + entrypoints_bpf__detach(skel); + skel_closenz(skel->progs.hid_tail_call.prog_fd); + skel_closenz(skel->progs.hid_prog_release.prog_fd); + skel_closenz(skel->progs.hid_free_inode.prog_fd); + skel_closenz(skel->maps.hid_jmp_table.map_fd); + skel_closenz(skel->maps.progs_map.map_fd); + skel_free(skel); +} +static inline struct entrypoints_bpf * +entrypoints_bpf__open(void) +{ + struct entrypoints_bpf *skel; + + skel = skel_alloc(sizeof(*skel)); + if (!skel) + goto cleanup; + skel->ctx.sz = (void *)&skel->links - (void *)skel; + return skel; +cleanup: + entrypoints_bpf__destroy(skel); + return NULL; +} + +static inline int +entrypoints_bpf__load(struct entrypoints_bpf *skel) +{ + struct bpf_load_and_run_opts opts = {}; + int err; + + opts.ctx = (struct bpf_loader_ctx *)skel; + opts.data_sz = 11504; + opts.data = (void *)"\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ 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+ if (!skel) + return NULL; + if (entrypoints_bpf__load(skel)) { + entrypoints_bpf__destroy(skel); + return NULL; + } + return skel; +} + +__attribute__((unused)) static void +entrypoints_bpf__assert(struct entrypoints_bpf *s __attribute__((unused))) +{ +#ifdef __cplusplus +#define _Static_assert static_assert +#endif +#ifdef __cplusplus +#undef _Static_assert +#endif +} + +#endif /* __ENTRYPOINTS_BPF_SKEL_H__ */ diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c new file mode 100644 index 000000000000..600b00fdf6c1 --- /dev/null +++ b/drivers/hid/bpf/hid_bpf_dispatch.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* + * HID-BPF support for Linux + * + * Copyright (c) 2022 Benjamin Tissoires + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/bitops.h> +#include <linux/btf.h> +#include <linux/btf_ids.h> +#include <linux/filter.h> +#include <linux/hid.h> +#include <linux/hid_bpf.h> +#include <linux/init.h> +#include <linux/kfifo.h> +#include <linux/module.h> +#include <linux/workqueue.h> +#include "hid_bpf_dispatch.h" +#include "entrypoints/entrypoints.lskel.h" + +struct hid_bpf_ops *hid_bpf_ops; +EXPORT_SYMBOL(hid_bpf_ops); + +/** + * hid_bpf_device_event - Called whenever an event is coming in from the device + * + * @ctx: The HID-BPF context + * + * @return %0 on success and keep processing; a negative error code to interrupt + * the processing of this event + * + * Declare an %fmod_ret tracing bpf program to this function and attach this + * program through hid_bpf_attach_prog() to have this helper called for + * any incoming event from the device itself. + * + * The function is called while on IRQ context, so we can not sleep. + */ +/* never used by the kernel but declared so we can load and attach a tracepoint */ +__weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx) +{ + return 0; +} +ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO); + +int +dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data, + u32 size, int interrupt) +{ + struct hid_bpf_ctx_kern ctx_kern = { + .ctx = { + .hid = hdev, + .report_type = type, + .size = size, + }, + .data = data, + }; + + if (type >= HID_REPORT_TYPES) + return -EINVAL; + + return hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern); +} +EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event); + +/** + * hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx + * + * @ctx: The HID-BPF context + * @offset: The offset within the memory + * @rdwr_buf_size: the const size of the buffer + * + * @returns %NULL on error, an %__u8 memory pointer on success + */ +noinline __u8 * +hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr_buf_size) +{ + struct hid_bpf_ctx_kern *ctx_kern; + + if (!ctx) + return NULL; + + ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx); + + if (rdwr_buf_size + offset > ctx->size) + return NULL; + + return ctx_kern->data + offset; +} + +/* + * The following set contains all functions we agree BPF programs + * can use. + */ +BTF_SET8_START(hid_bpf_kfunc_ids) +BTF_ID_FLAGS(func, call_hid_bpf_prog_release) +BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL) +BTF_SET8_END(hid_bpf_kfunc_ids) + +static const struct btf_kfunc_id_set hid_bpf_kfunc_set = { + .owner = THIS_MODULE, + .set = &hid_bpf_kfunc_ids, +}; + +static int device_match_id(struct device *dev, const void *id) +{ + struct hid_device *hdev = to_hid_device(dev); + + return hdev->id == *(int *)id; +} + +/** + * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device + * + * @hid_id: the system unique identifier of the HID device + * @prog_fd: an fd in the user process representing the program to attach + * @flags: any logical OR combination of &enum hid_bpf_attach_flags + * + * @returns %0 on success, an error code otherwise. + */ +/* called from syscall */ +noinline int +hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags) +{ + struct hid_device *hdev; + struct device *dev; + int prog_type = hid_bpf_get_prog_attach_type(prog_fd); + + if (!hid_bpf_ops) + return -EINVAL; + + if (prog_type < 0) + return prog_type; + + if (prog_type >= HID_BPF_PROG_TYPE_MAX) + return -EINVAL; + + if ((flags & ~HID_BPF_FLAG_MASK)) + return -EINVAL; + + dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id); + if (!dev) + return -EINVAL; + + hdev = to_hid_device(dev); + + return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags); +} + +/* for syscall HID-BPF */ +BTF_SET8_START(hid_bpf_syscall_kfunc_ids) +BTF_ID_FLAGS(func, hid_bpf_attach_prog) +BTF_SET8_END(hid_bpf_syscall_kfunc_ids) + +static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = { + .owner = THIS_MODULE, + .set = &hid_bpf_syscall_kfunc_ids, +}; + +void hid_bpf_destroy_device(struct hid_device *hdev) +{ + if (!hdev) + return; + + /* mark the device as destroyed in bpf so we don't reattach it */ + hdev->bpf.destroyed = true; + + __hid_bpf_destroy_device(hdev); +} +EXPORT_SYMBOL_GPL(hid_bpf_destroy_device); + +void hid_bpf_device_init(struct hid_device *hdev) +{ + spin_lock_init(&hdev->bpf.progs_lock); +} +EXPORT_SYMBOL_GPL(hid_bpf_device_init); + +static int __init hid_bpf_init(void) +{ + int err; + + /* Note: if we exit with an error any time here, we would entirely break HID, which + * is probably not something we want. So we log an error and return success. + * + * This is not a big deal: the syscall allowing to attach a BPF program to a HID device + * will not be available, so nobody will be able to use the functionality. + */ + + err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set); + if (err) { + pr_warn("error while setting HID BPF tracing kfuncs: %d", err); + return 0; + } + + err = hid_bpf_preload_skel(); + if (err) { + pr_warn("error while preloading HID BPF dispatcher: %d", err); + return 0; + } + + /* register syscalls after we are sure we can load our preloaded bpf program */ + err = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &hid_bpf_syscall_kfunc_set); + if (err) { + pr_warn("error while setting HID BPF syscall kfuncs: %d", err); + return 0; + } + + return 0; +} + +static void __exit hid_bpf_exit(void) +{ + /* HID depends on us, so if we hit that code, we are guaranteed that hid + * has been removed and thus we do not need to clear the HID devices + */ + hid_bpf_free_links_and_skel(); +} + +late_initcall(hid_bpf_init); +module_exit(hid_bpf_exit); +MODULE_AUTHOR("Benjamin Tissoires"); +MODULE_LICENSE("GPL"); diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h new file mode 100644 index 000000000000..98c378e18b2b --- /dev/null +++ b/drivers/hid/bpf/hid_bpf_dispatch.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef _BPF_HID_BPF_DISPATCH_H +#define _BPF_HID_BPF_DISPATCH_H + +#include <linux/hid.h> + +struct hid_bpf_ctx_kern { + struct hid_bpf_ctx ctx; + u8 *data; +}; + +int hid_bpf_preload_skel(void); +void hid_bpf_free_links_and_skel(void); +int hid_bpf_get_prog_attach_type(int prog_fd); +int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type, int prog_fd, + __u32 flags); +void __hid_bpf_destroy_device(struct hid_device *hdev); +int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type, + struct hid_bpf_ctx_kern *ctx_kern); + +struct bpf_prog; + +/* HID-BPF internal kfuncs API */ +bool call_hid_bpf_prog_release(u64 prog, int table_cnt); + +#endif diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c new file mode 100644 index 000000000000..05225ff3cc27 --- /dev/null +++ b/drivers/hid/bpf/hid_bpf_jmp_table.c @@ -0,0 +1,568 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* + * HID-BPF support for Linux + * + * Copyright (c) 2022 Benjamin Tissoires + */ + +#include <linux/bitops.h> +#include <linux/btf.h> +#include <linux/btf_ids.h> +#include <linux/circ_buf.h> +#include <linux/filter.h> +#include <linux/hid.h> +#include <linux/hid_bpf.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/workqueue.h> +#include "hid_bpf_dispatch.h" +#include "entrypoints/entrypoints.lskel.h" + +#define HID_BPF_MAX_PROGS 1024 /* keep this in sync with preloaded bpf, + * needs to be a power of 2 as we use it as + * a circular buffer + */ + +#define NEXT(idx) (((idx) + 1) & (HID_BPF_MAX_PROGS - 1)) +#define PREV(idx) (((idx) - 1) & (HID_BPF_MAX_PROGS - 1)) + +/* + * represents one attached program stored in the hid jump table + */ +struct hid_bpf_prog_entry { + struct bpf_prog *prog; + struct hid_device *hdev; + enum hid_bpf_prog_type type; + u16 idx; +}; + +struct hid_bpf_jmp_table { + struct bpf_map *map; + struct bpf_map *prog_keys; + struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */ + int tail, head; + struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */ + unsigned long enabled[BITS_TO_LONGS(HID_BPF_MAX_PROGS)]; +}; + +#define FOR_ENTRIES(__i, __start, __end) \ + for (__i = __start; CIRC_CNT(__end, __i, HID_BPF_MAX_PROGS); __i = NEXT(__i)) + +static struct hid_bpf_jmp_table jmp_table; + +static DEFINE_MUTEX(hid_bpf_attach_lock); /* held when attaching/detaching programs */ + +static void hid_bpf_release_progs(struct work_struct *work); + +static DECLARE_WORK(release_work, hid_bpf_release_progs); + +BTF_ID_LIST(hid_bpf_btf_ids) +BTF_ID(func, hid_bpf_device_event) /* HID_BPF_PROG_TYPE_DEVICE_EVENT */ + +static int hid_bpf_max_programs(enum hid_bpf_prog_type type) +{ + switch (type) { + case HID_BPF_PROG_TYPE_DEVICE_EVENT: + return HID_BPF_MAX_PROGS_PER_DEV; + default: + return -EINVAL; + } +} + +static int hid_bpf_program_count(struct hid_device *hdev, + struct bpf_prog *prog, + enum hid_bpf_prog_type type) +{ + int i, n = 0; + + if (type >= HID_BPF_PROG_TYPE_MAX) + return -EINVAL; + + FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) { + struct hid_bpf_prog_entry *entry = &jmp_table.entries[i]; + + if (type != HID_BPF_PROG_TYPE_UNDEF && entry->type != type) + continue; + + if (hdev && entry->hdev != hdev) + continue; + + if (prog && entry->prog != prog) + continue; + + n++; + } + + return n; +} + +__weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx) +{ + return 0; +} +ALLOW_ERROR_INJECTION(__hid_bpf_tail_call, ERRNO); + +int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type, + struct hid_bpf_ctx_kern *ctx_kern) +{ + struct hid_bpf_prog_list *prog_list; + int i, idx, err = 0; + + rcu_read_lock(); + prog_list = rcu_dereference(hdev->bpf.progs[type]); + + if (!prog_list) + goto out_unlock; + + for (i = 0; i < prog_list->prog_cnt; i++) { + idx = prog_list->prog_idx[i]; + + if (!test_bit(idx, jmp_table.enabled)) + continue; + + ctx_kern->ctx.index = idx; + err = __hid_bpf_tail_call(&ctx_kern->ctx); + if (err) + break; + } + + out_unlock: + rcu_read_unlock(); + + return err; +} + +/* + * assign the list of programs attached to a given hid device. + */ +static void __hid_bpf_set_hdev_progs(struct hid_device *hdev, struct hid_bpf_prog_list *new_list, + enum hid_bpf_prog_type type) +{ + struct hid_bpf_prog_list *old_list; + + spin_lock(&hdev->bpf.progs_lock); + old_list = rcu_dereference_protected(hdev->bpf.progs[type], + lockdep_is_held(&hdev->bpf.progs_lock)); + rcu_assign_pointer(hdev->bpf.progs[type], new_list); + spin_unlock(&hdev->bpf.progs_lock); + synchronize_rcu(); + + kfree(old_list); +} + +/* + * allocate and populate the list of programs attached to a given hid device. + * + * Must be called under lock. + */ +static int hid_bpf_populate_hdev(struct hid_device *hdev, enum hid_bpf_prog_type type) +{ + struct hid_bpf_prog_list *new_list; + int i; + + if (type >= HID_BPF_PROG_TYPE_MAX || !hdev) + return -EINVAL; + + if (hdev->bpf.destroyed) + return 0; + + new_list = kzalloc(sizeof(*new_list), GFP_KERNEL); + if (!new_list) + return -ENOMEM; + + FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) { + struct hid_bpf_prog_entry *entry = &jmp_table.entries[i]; + + if (entry->type == type && entry->hdev == hdev && + test_bit(entry->idx, jmp_table.enabled)) + new_list->prog_idx[new_list->prog_cnt++] = entry->idx; + } + + __hid_bpf_set_hdev_progs(hdev, new_list, type); + + return 0; +} + +static void __hid_bpf_do_release_prog(int map_fd, unsigned int idx) +{ + skel_map_delete_elem(map_fd, &idx); + jmp_table.progs[idx] = NULL; +} + +static void hid_bpf_release_progs(struct work_struct *work) +{ + int i, j, n, map_fd = -1; + + if (!jmp_table.map) + return; + + /* retrieve a fd of our prog_array map in BPF */ + map_fd = skel_map_get_fd_by_id(jmp_table.map->id); + if (map_fd < 0) + return; + + mutex_lock(&hid_bpf_attach_lock); /* protects against attaching new programs */ + + /* detach unused progs from HID devices */ + FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) { + struct hid_bpf_prog_entry *entry = &jmp_table.entries[i]; + enum hid_bpf_prog_type type; + struct hid_device *hdev; + + if (test_bit(entry->idx, jmp_table.enabled)) + continue; + + /* we have an attached prog */ + if (entry->hdev) { + hdev = entry->hdev; + type = entry->type; + + hid_bpf_populate_hdev(hdev, type); + + /* mark all other disabled progs from hdev of the given type as detached */ + FOR_ENTRIES(j, i, jmp_table.head) { + struct hid_bpf_prog_entry *next; + + next = &jmp_table.entries[j]; + + if (test_bit(next->idx, jmp_table.enabled)) + continue; + + if (next->hdev == hdev && next->type == type) + next->hdev = NULL; + } + } + } + + /* remove all unused progs from the jump table */ + FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) { + struct hid_bpf_prog_entry *entry = &jmp_table.entries[i]; + + if (test_bit(entry->idx, jmp_table.enabled)) + continue; + + if (entry->prog) + __hid_bpf_do_release_prog(map_fd, entry->idx); + } + + /* compact the entry list */ + n = jmp_table.tail; + FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) { + struct hid_bpf_prog_entry *entry = &jmp_table.entries[i]; + + if (!test_bit(entry->idx, jmp_table.enabled)) + continue; + + jmp_table.entries[n] = jmp_table.entries[i]; + n = NEXT(n); + } + + jmp_table.head = n; + + mutex_unlock(&hid_bpf_attach_lock); + + if (map_fd >= 0) + close_fd(map_fd); +} + +static void hid_bpf_release_prog_at(int idx) +{ + int map_fd = -1; + + /* retrieve a fd of our prog_array map in BPF */ + map_fd = skel_map_get_fd_by_id(jmp_table.map->id); + if (map_fd < 0) + return; + + __hid_bpf_do_release_prog(map_fd, idx); + + close(map_fd); +} + +/* + * Insert the given BPF program represented by its fd in the jmp table. + * Returns the index in the jump table or a negative error. + */ +static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog) +{ + int i, cnt, index = -1, map_fd = -1, progs_map_fd = -1, err = -EINVAL; + + /* retrieve a fd of our prog_array map in BPF */ + map_fd = skel_map_get_fd_by_id(jmp_table.map->id); + /* take an fd for the table of progs we monitor with SEC("fexit/bpf_prog_release") */ + progs_map_fd = skel_map_get_fd_by_id(jmp_table.prog_keys->id); + + if (map_fd < 0 || progs_map_fd < 0) { + err = -EINVAL; + goto out; + } + + cnt = 0; + /* find the first available index in the jmp_table + * and count how many time this program has been inserted + */ + for (i = 0; i < HID_BPF_MAX_PROGS; i++) { + if (!jmp_table.progs[i] && index < 0) { + /* mark the index as used */ + jmp_table.progs[i] = prog; + index = i; + __set_bit(i, jmp_table.enabled); + cnt++; + } else { + if (jmp_table.progs[i] == prog) + cnt++; + } + } + if (index < 0) { + err = -ENOMEM; + goto out; + } + + /* insert the program in the jump table */ + err = skel_map_update_elem(map_fd, &index, &prog_fd, 0); + if (err) + goto out; + + /* insert the program in the prog list table */ + err = skel_map_update_elem(progs_map_fd, &prog, &cnt, 0); + if (err) + goto out; + + /* return the index */ + err = index; + + out: + if (err < 0) + __hid_bpf_do_release_prog(map_fd, index); + if (map_fd >= 0) + close_fd(map_fd); + if (progs_map_fd >= 0) + close_fd(progs_map_fd); + return err; +} + +int hid_bpf_get_prog_attach_type(int prog_fd) +{ + struct bpf_prog *prog = NULL; + int i; + int prog_type = HID_BPF_PROG_TYPE_UNDEF; + + prog = bpf_prog_get(prog_fd); + if (IS_ERR(prog)) + return PTR_ERR(prog); + + for (i = 0; i < HID_BPF_PROG_TYPE_MAX; i++) { + if (hid_bpf_btf_ids[i] == prog->aux->attach_btf_id) { + prog_type = i; + break; + } + } + + bpf_prog_put(prog); + + return prog_type; +} + +/* called from syscall */ +noinline int +__hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type, + int prog_fd, __u32 flags) +{ + struct bpf_prog *prog = NULL; + struct hid_bpf_prog_entry *prog_entry; + int cnt, err = -EINVAL, prog_idx = -1; + + /* take a ref on the prog itself */ + prog = bpf_prog_get(prog_fd); + if (IS_ERR(prog)) + return PTR_ERR(prog); + + mutex_lock(&hid_bpf_attach_lock); + + /* do not attach too many programs to a given HID device */ + cnt = hid_bpf_program_count(hdev, NULL, prog_type); + if (cnt < 0) { + err = cnt; + goto out_unlock; + } + + if (cnt >= hid_bpf_max_programs(prog_type)) { + err = -E2BIG; + goto out_unlock; + } + + prog_idx = hid_bpf_insert_prog(prog_fd, prog); + /* if the jmp table is full, abort */ + if (prog_idx < 0) { + err = prog_idx; + goto out_unlock; + } + + if (flags & HID_BPF_FLAG_INSERT_HEAD) { + /* take the previous prog_entry slot */ + jmp_table.tail = PREV(jmp_table.tail); + prog_entry = &jmp_table.entries[jmp_table.tail]; + } else { + /* take the next prog_entry slot */ + prog_entry = &jmp_table.entries[jmp_table.head]; + jmp_table.head = NEXT(jmp_table.head); + } + + /* we steal the ref here */ + prog_entry->prog = prog; + prog_entry->idx = prog_idx; + prog_entry->hdev = hdev; + prog_entry->type = prog_type; + + /* finally store the index in the device list */ + err = hid_bpf_populate_hdev(hdev, prog_type); + if (err) + hid_bpf_release_prog_at(prog_idx); + + out_unlock: + mutex_unlock(&hid_bpf_attach_lock); + + /* we only use prog as a key in the various tables, so we don't need to actually + * increment the ref count. + */ + bpf_prog_put(prog); + + return err; +} + +void __hid_bpf_destroy_device(struct hid_device *hdev) +{ + int type, i; + struct hid_bpf_prog_list *prog_list; + + rcu_read_lock(); + + for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++) { + prog_list = rcu_dereference(hdev->bpf.progs[type]); + + if (!prog_list) + continue; + + for (i = 0; i < prog_list->prog_cnt; i++) + __clear_bit(prog_list->prog_idx[i], jmp_table.enabled); + } + + rcu_read_unlock(); + + for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++) + __hid_bpf_set_hdev_progs(hdev, NULL, type); + + /* schedule release of all detached progs */ + schedule_work(&release_work); +} + +noinline bool +call_hid_bpf_prog_release(u64 prog_key, int table_cnt) +{ + /* compare with how many refs are left in the bpf program */ + struct bpf_prog *prog = (struct bpf_prog *)prog_key; + int idx; + + if (!prog) + return false; + + if (atomic64_read(&prog->aux->refcnt) != table_cnt) + return false; + + /* we don't need locking here because the entries in the progs table + * are stable: + * if there are other users (and the progs entries might change), we + * would return in the statement above. + */ + for (idx = 0; idx < HID_BPF_MAX_PROGS; idx++) { + if (jmp_table.progs[idx] == prog) { + __clear_bit(idx, jmp_table.enabled); + break; + } + } + if (idx >= HID_BPF_MAX_PROGS) { + /* should never happen if we get our refcount right */ + idx = -1; + } + + /* schedule release of all detached progs */ + schedule_work(&release_work); + return idx >= 0; +} + +#define HID_BPF_PROGS_COUNT 3 + +static struct bpf_link *links[HID_BPF_PROGS_COUNT]; +static struct entrypoints_bpf *skel; + +void hid_bpf_free_links_and_skel(void) +{ + int i; + + /* the following is enough to release all programs attached to hid */ + if (jmp_table.prog_keys) + bpf_map_put_with_uref(jmp_table.prog_keys); + + if (jmp_table.map) + bpf_map_put_with_uref(jmp_table.map); + + for (i = 0; i < ARRAY_SIZE(links); i++) { + if (!IS_ERR_OR_NULL(links[i])) + bpf_link_put(links[i]); + } + entrypoints_bpf__destroy(skel); +} + +#define ATTACH_AND_STORE_LINK(__name) do { \ + err = entrypoints_bpf__##__name##__attach(skel); \ + if (err) \ + goto out; \ + \ + links[idx] = bpf_link_get_from_fd(skel->links.__name##_fd); \ + if (IS_ERR(links[idx])) { \ + err = PTR_ERR(links[idx]); \ + goto out; \ + } \ + \ + /* Avoid taking over stdin/stdout/stderr of init process. Zeroing out \ + * makes skel_closenz() a no-op later in iterators_bpf__destroy(). \ + */ \ + close_fd(skel->links.__name##_fd); \ + skel->links.__name##_fd = 0; \ + idx++; \ +} while (0) + +int hid_bpf_preload_skel(void) +{ + int err, idx = 0; + + skel = entrypoints_bpf__open(); + if (!skel) + return -ENOMEM; + + err = entrypoints_bpf__load(skel); + if (err) + goto out; + + jmp_table.map = bpf_map_get_with_uref(skel->maps.hid_jmp_table.map_fd); + if (IS_ERR(jmp_table.map)) { + err = PTR_ERR(jmp_table.map); + goto out; + } + + jmp_table.prog_keys = bpf_map_get_with_uref(skel->maps.progs_map.map_fd); + if (IS_ERR(jmp_table.prog_keys)) { + err = PTR_ERR(jmp_table.prog_keys); + goto out; + } + + ATTACH_AND_STORE_LINK(hid_tail_call); + ATTACH_AND_STORE_LINK(hid_prog_release); + ATTACH_AND_STORE_LINK(hid_free_inode); + + return 0; +out: + hid_bpf_free_links_and_skel(); + return err; +} diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 9c1d31f63f85..2557a7c09627 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -2040,6 +2040,10 @@ int hid_input_report(struct hid_device *hid, enum hid_report_type type, u8 *data report_enum = hid->report_enum + type; hdrv = hid->driver;

+ ret = dispatch_hid_bpf_device_event(hid, type, data, size, interrupt); + if (ret) + goto unlock; + if (!size) { dbg_hid("empty report\n"); ret = -1; @@ -2790,6 +2794,8 @@ struct hid_device *hid_allocate_device(void) sema_init(&hdev->driver_input_lock, 1); mutex_init(&hdev->ll_open_lock);

+ hid_bpf_device_init(hdev); + return hdev; } EXPORT_SYMBOL_GPL(hid_allocate_device); @@ -2816,6 +2822,7 @@ static void hid_remove_device(struct hid_device *hdev) */ void hid_destroy_device(struct hid_device *hdev) { + hid_bpf_destroy_device(hdev); hid_remove_device(hdev); put_device(&hdev->dev); } @@ -2902,6 +2909,11 @@ int hid_check_keys_pressed(struct hid_device *hid) } EXPORT_SYMBOL_GPL(hid_check_keys_pressed);

+static struct hid_bpf_ops hid_ops = { + .owner = THIS_MODULE, + .bus_type = &hid_bus_type, +}; + static int __init hid_init(void) { int ret; @@ -2916,6 +2928,10 @@ static int __init hid_init(void) goto err; }

+#ifdef CONFIG_HID_BPF + hid_bpf_ops = &hid_ops; +#endif + ret = hidraw_init(); if (ret) goto err_bus; @@ -2931,6 +2947,9 @@ static int __init hid_init(void)

static void __exit hid_exit(void) { +#ifdef CONFIG_HID_BPF + hid_bpf_ops = NULL; +#endif hid_debug_exit(); hidraw_exit(); bus_unregister(&hid_bus_type); diff --git a/include/linux/hid.h b/include/linux/hid.h index 8677ae38599e..cd3c52fae7b1 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -26,6 +26,7 @@ #include <linux/mutex.h> #include <linux/power_supply.h> #include <uapi/linux/hid.h> +#include <linux/hid_bpf.h>

/* * We parse each description item into this structure. Short items data @@ -651,6 +652,10 @@ struct hid_device { /* device report descriptor */ wait_queue_head_t debug_wait;

unsigned int id; /* system unique id */ + +#ifdef CONFIG_BPF + struct hid_bpf bpf; /* hid-bpf data */ +#endif /* CONFIG_BPF */ };

#define to_hid_device(pdev) \ diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h new file mode 100644 index 000000000000..5d53b12c6ea0 --- /dev/null +++ b/include/linux/hid_bpf.h @@ -0,0 +1,102 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ + +#ifndef __HID_BPF_H +#define __HID_BPF_H + +#include <linux/spinlock.h> +#include <uapi/linux/hid.h> +#include <uapi/linux/hid_bpf.h> + +struct hid_device; + +/* + * The following is the HID BPF API. + * + * It should be treated as UAPI, so extra care is required + * when making change to this file. + */ + +/** + * struct hid_bpf_ctx - User accessible data for all HID programs + * + * ``data`` is not directly accessible from the context. We need to issue + * a call to ``hid_bpf_get_data()`` in order to get a pointer to that field. + * + * All of these fields are currently read-only. + * + * @index: program index in the jump table. No special meaning (a smaller index + * doesn't mean the program will be executed before another program with + * a bigger index). + * @hid: the ``struct hid_device`` representing the device itself + * @report_type: used for ``hid_bpf_device_event()`` + * @size: Valid data in the data field. + * + * Programs can get the available valid size in data by fetching this field. + */ +struct hid_bpf_ctx { + __u32 index; + const struct hid_device *hid; + enum hid_report_type report_type; + __s32 size; +}; + +/* Following functions are tracepoints that BPF programs can attach to */ +int hid_bpf_device_event(struct hid_bpf_ctx *ctx); + +/* Following functions are kfunc that we export to BPF programs */ +/* only available in tracing */ +__u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t __sz); + +/* only available in syscall */ +int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags); + +/* + * Below is HID internal + */ + +/* internal function to call eBPF programs, not to be used by anybody */ +int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx); + +#define HID_BPF_MAX_PROGS_PER_DEV 64 +#define HID_BPF_FLAG_MASK (((HID_BPF_FLAG_MAX - 1) << 1) - 1) + +/* types of HID programs to attach to */ +enum hid_bpf_prog_type { + HID_BPF_PROG_TYPE_UNDEF = -1, + HID_BPF_PROG_TYPE_DEVICE_EVENT, /* an event is emitted from the device */ + HID_BPF_PROG_TYPE_MAX, +}; + +struct hid_bpf_ops { + struct module *owner; + struct bus_type *bus_type; +}; + +extern struct hid_bpf_ops *hid_bpf_ops; + +struct hid_bpf_prog_list { + u16 prog_idx[HID_BPF_MAX_PROGS_PER_DEV]; + u8 prog_cnt; +}; + +/* stored in each device */ +struct hid_bpf { + struct hid_bpf_prog_list __rcu *progs[HID_BPF_PROG_TYPE_MAX]; /* attached BPF progs */ + bool destroyed; /* prevents the assignment of any progs */ + + spinlock_t progs_lock; /* protects RCU update of progs */ +}; + +#ifdef CONFIG_HID_BPF +int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data, + u32 size, int interrupt); +void hid_bpf_destroy_device(struct hid_device *hid); +void hid_bpf_device_init(struct hid_device *hid); +#else /* CONFIG_HID_BPF */ +static inline int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data, + u32 size, int interrupt) { return 0; } +static inline void hid_bpf_destroy_device(struct hid_device *hid) {} +static inline void hid_bpf_device_init(struct hid_device *hid) {} +#endif /* CONFIG_HID_BPF */ + +#endif /* __HID_BPF_H */ diff --git a/include/uapi/linux/hid_bpf.h b/include/uapi/linux/hid_bpf.h new file mode 100644 index 000000000000..ba8caf9b60ee --- /dev/null +++ b/include/uapi/linux/hid_bpf.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ + +#ifndef _UAPI_HID_BPF_H +#define _UAPI_HID_BPF_H + +#include <linux/const.h> +#include <linux/hid.h> + +/** + * enum hid_bpf_attach_flags - flags used when attaching a HIF-BPF program + * + * @HID_BPF_FLAG_NONE: no specific flag is used, the kernel choses where to + * insert the program + * @HID_BPF_FLAG_INSERT_HEAD: insert the given program before any other program + * currently attached to the device. This doesn't + * guarantee that this program will always be first + * @HID_BPF_FLAG_MAX: sentinel value, not to be used by the callers + */ +enum hid_bpf_attach_flags { + HID_BPF_FLAG_NONE = 0, + HID_BPF_FLAG_INSERT_HEAD = _BITUL(0), + HID_BPF_FLAG_MAX, +}; + +#endif /* _UAPI_HID_BPF_H */ diff --git a/tools/include/uapi/linux/hid.h b/tools/include/uapi/linux/hid.h new file mode 100644 index 000000000000..3e63bea3b3e2 --- /dev/null +++ b/tools/include/uapi/linux/hid.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ +/* + * Copyright (c) 1999 Andreas Gal + * Copyright (c) 2000-2001 Vojtech Pavlik + * Copyright (c) 2006-2007 Jiri Kosina + */ +#ifndef _UAPI__HID_H +#define _UAPI__HID_H + + + +/* + * USB HID (Human Interface Device) interface class code + */ + +#define USB_INTERFACE_CLASS_HID 3 + +/* + * USB HID interface subclass and protocol codes + */ + +#define USB_INTERFACE_SUBCLASS_BOOT 1 +#define USB_INTERFACE_PROTOCOL_KEYBOARD 1 +#define USB_INTERFACE_PROTOCOL_MOUSE 2 + +/* + * HID report types --- Ouch! HID spec says 1 2 3! + */ + +enum hid_report_type { + HID_INPUT_REPORT = 0, + HID_OUTPUT_REPORT = 1, + HID_FEATURE_REPORT = 2, + + HID_REPORT_TYPES, +}; + +/* + * HID class requests + */ + +enum hid_class_request { + HID_REQ_GET_REPORT = 0x01, + HID_REQ_GET_IDLE = 0x02, + HID_REQ_GET_PROTOCOL = 0x03, + HID_REQ_SET_REPORT = 0x09, + HID_REQ_SET_IDLE = 0x0A, + HID_REQ_SET_PROTOCOL = 0x0B, +}; + +/* + * HID class descriptor types + */ + +#define HID_DT_HID (USB_TYPE_CLASS | 0x01) +#define HID_DT_REPORT (USB_TYPE_CLASS | 0x02) +#define HID_DT_PHYSICAL (USB_TYPE_CLASS | 0x03) + +#define HID_MAX_DESCRIPTOR_SIZE 4096 + + +#endif /* _UAPI__HID_H */ diff --git a/tools/include/uapi/linux/hid_bpf.h b/tools/include/uapi/linux/hid_bpf.h new file mode 100644 index 000000000000..ba8caf9b60ee --- /dev/null +++ b/tools/include/uapi/linux/hid_bpf.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ + +#ifndef _UAPI_HID_BPF_H +#define _UAPI_HID_BPF_H + +#include <linux/const.h> +#include <linux/hid.h> + +/** + * enum hid_bpf_attach_flags - flags used when attaching a HIF-BPF program + * + * @HID_BPF_FLAG_NONE: no specific flag is used, the kernel choses where to + * insert the program + * @HID_BPF_FLAG_INSERT_HEAD: insert the given program before any other program + * currently attached to the device. This doesn't + * guarantee that this program will always be first + * @HID_BPF_FLAG_MAX: sentinel value, not to be used by the callers + */ +enum hid_bpf_attach_flags { + HID_BPF_FLAG_NONE = 0, + HID_BPF_FLAG_INSERT_HEAD = _BITUL(0), + HID_BPF_FLAG_MAX, +}; + +#endif /* _UAPI_HID_BPF_H */

Kind of a hack, but works for now:

Instead of listening for any close of eBPF program, we now decrement the refcount when we insert it in our internal map of fd progs.

This is safe to do because: - we listen to any call of destructor of programs - when a program is being destroyed, we disable it by removing it from any RCU list used by any HID device (so it will never be called) - we then trigger a job to cleanup the prog fd map, but we overwrite the removal of the elements to not do anything on the programs, just remove the allocated space

This is better than previously because we can remove the map of known programs and their usage count. We now rely on the refcount of bpf, which has greater chances of being accurate.

Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

---

new in v11 --- drivers/hid/bpf/entrypoints/entrypoints.bpf.c | 40 +- .../hid/bpf/entrypoints/entrypoints.lskel.h | 722 +++++------------- drivers/hid/bpf/hid_bpf_dispatch.c | 2 +- drivers/hid/bpf/hid_bpf_dispatch.h | 2 +- drivers/hid/bpf/hid_bpf_jmp_table.c | 83 +- 5 files changed, 249 insertions(+), 600 deletions(-)

diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c index 41dd66d5fc7a..7c1895d9e5c0 100644 --- a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c +++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c @@ -7,7 +7,7 @@

#define HID_BPF_MAX_PROGS 1024

-extern bool call_hid_bpf_prog_release(u64 prog, int table_cnt) __ksym; +extern void call_hid_bpf_prog_put_deferred(struct work_struct *work) __ksym;

struct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); @@ -16,13 +16,6 @@ struct { __uint(value_size, sizeof(__u32)); } hid_jmp_table SEC(".maps");

-struct { - __uint(type, BPF_MAP_TYPE_HASH); - __uint(max_entries, HID_BPF_MAX_PROGS * HID_BPF_PROG_TYPE_MAX); - __type(key, void *); - __type(value, __u8); -} progs_map SEC(".maps"); - SEC("fmod_ret/__hid_bpf_tail_call") int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx) { @@ -31,35 +24,10 @@ int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx) return 0; }

-static void release_prog(u64 prog) -{ - u8 *value; - - value = bpf_map_lookup_elem(&progs_map, &prog); - if (!value) - return; - - if (call_hid_bpf_prog_release(prog, *value)) - bpf_map_delete_elem(&progs_map, &prog); -} - -SEC("fexit/bpf_prog_release") -int BPF_PROG(hid_prog_release, struct inode *inode, struct file *filp) +SEC("fentry/bpf_prog_put_deferred") +int BPF_PROG(hid_bpf_prog_put_deferred, struct work_struct *work) { - u64 prog = (u64)filp->private_data; - - release_prog(prog); - - return 0; -} - -SEC("fexit/bpf_free_inode") -int BPF_PROG(hid_free_inode, struct inode *inode) -{ - u64 prog = (u64)inode->i_private; - - release_prog(prog); - + call_hid_bpf_prog_put_deferred(work); return 0; }

diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h index d6a6045a06fe..524e5f90415f 100644 --- a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h +++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h @@ -9,17 +9,14 @@ struct entrypoints_bpf { struct bpf_loader_ctx ctx; struct { struct bpf_map_desc hid_jmp_table; - struct bpf_map_desc progs_map; } maps; struct { struct bpf_prog_desc hid_tail_call; - struct bpf_prog_desc hid_prog_release; - struct bpf_prog_desc hid_free_inode; + struct bpf_prog_desc hid_bpf_prog_put_deferred; } progs; struct { int hid_tail_call_fd; - int hid_prog_release_fd; - int hid_free_inode_fd; + int hid_bpf_prog_put_deferred_fd; } links; };

@@ -35,24 +32,13 @@ entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel) }

static inline int -entrypoints_bpf__hid_prog_release__attach(struct entrypoints_bpf *skel) +entrypoints_bpf__hid_bpf_prog_put_deferred__attach(struct entrypoints_bpf *skel) { - int prog_fd = skel->progs.hid_prog_release.prog_fd; + int prog_fd = skel->progs.hid_bpf_prog_put_deferred.prog_fd; int fd = skel_raw_tracepoint_open(NULL, prog_fd);

if (fd > 0) - skel->links.hid_prog_release_fd = fd; - return fd; -} - -static inline int -entrypoints_bpf__hid_free_inode__attach(struct entrypoints_bpf *skel) -{ - int prog_fd = skel->progs.hid_free_inode.prog_fd; - int fd = skel_raw_tracepoint_open(NULL, prog_fd); - - if (fd > 0) - skel->links.hid_free_inode_fd = fd; + skel->links.hid_bpf_prog_put_deferred_fd = fd; return fd; }

@@ -62,8 +48,7 @@ entrypoints_bpf__attach(struct entrypoints_bpf *skel) int ret = 0;

ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel); - ret = ret < 0 ? ret : entrypoints_bpf__hid_prog_release__attach(skel); - ret = ret < 0 ? ret : entrypoints_bpf__hid_free_inode__attach(skel); + ret = ret < 0 ? ret : entrypoints_bpf__hid_bpf_prog_put_deferred__attach(skel); return ret < 0 ? ret : 0; }

@@ -71,8 +56,7 @@ static inline void entrypoints_bpf__detach(struct entrypoints_bpf *skel) { skel_closenz(skel->links.hid_tail_call_fd); - skel_closenz(skel->links.hid_prog_release_fd); - skel_closenz(skel->links.hid_free_inode_fd); + skel_closenz(skel->links.hid_bpf_prog_put_deferred_fd); } static void entrypoints_bpf__destroy(struct entrypoints_bpf *skel) @@ -81,10 +65,8 @@ entrypoints_bpf__destroy(struct entrypoints_bpf *skel) return; entrypoints_bpf__detach(skel); skel_closenz(skel->progs.hid_tail_call.prog_fd); - skel_closenz(skel->progs.hid_prog_release.prog_fd); - skel_closenz(skel->progs.hid_free_inode.prog_fd); + skel_closenz(skel->progs.hid_bpf_prog_put_deferred.prog_fd); skel_closenz(skel->maps.hid_jmp_table.map_fd); - skel_closenz(skel->maps.progs_map.map_fd); skel_free(skel); } static inline struct entrypoints_bpf * @@ -109,7 +91,7 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel) int err;

opts.ctx = (struct bpf_loader_ctx *)skel; - opts.data_sz = 11504; + opts.data_sz = 4768; opts.data = (void *)"\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ @@ -144,509 +126,213 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel) \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x9f\xeb\x01\0\ -\x18\0\0\0\0\0\0\0\x78\x14\0\0\x78\x14\0\0\xf4\x0c\0\0\0\0\0\0\0\0\0\x02\x03\0\ +\x18\0\0\0\0\0\0\0\x34\x06\0\0\x34\x06\0\0\x92\x04\0\0\0\0\0\0\0\0\0\x02\x03\0\ \0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\ \0\0\x04\0\0\0\x03\0\0\0\x05\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\ \x02\x06\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\0\x04\0\0\0\0\0\0\ 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+\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x15\xff\0\0\ +\0\0\x63\x7a\x84\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\ +\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x28\0\0\0\ +\0\0\x61\xa0\x84\xff\0\0\0\0\x63\x06\x2c\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\ +\0\0\0\0"; err = bpf_load_and_run(&opts); if (err < 0) return err; diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c index 600b00fdf6c1..0ef99caf937a 100644 --- a/drivers/hid/bpf/hid_bpf_dispatch.c +++ b/drivers/hid/bpf/hid_bpf_dispatch.c @@ -94,7 +94,7 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr * can use. */ BTF_SET8_START(hid_bpf_kfunc_ids) -BTF_ID_FLAGS(func, call_hid_bpf_prog_release) +BTF_ID_FLAGS(func, call_hid_bpf_prog_put_deferred) BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL) BTF_SET8_END(hid_bpf_kfunc_ids)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h index 98c378e18b2b..e2d64faa3932 100644 --- a/drivers/hid/bpf/hid_bpf_dispatch.h +++ b/drivers/hid/bpf/hid_bpf_dispatch.h @@ -22,6 +22,6 @@ int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type, struct bpf_prog;

/* HID-BPF internal kfuncs API */ -bool call_hid_bpf_prog_release(u64 prog, int table_cnt); +void call_hid_bpf_prog_put_deferred(struct work_struct *work);

#endif diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c index 05225ff3cc27..57ed937fd70a 100644 --- a/drivers/hid/bpf/hid_bpf_jmp_table.c +++ b/drivers/hid/bpf/hid_bpf_jmp_table.c @@ -39,7 +39,6 @@ struct hid_bpf_prog_entry {

struct hid_bpf_jmp_table { struct bpf_map *map; - struct bpf_map *prog_keys; struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */ int tail, head; struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */ @@ -286,14 +285,12 @@ static void hid_bpf_release_prog_at(int idx) */ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog) { - int i, cnt, index = -1, map_fd = -1, progs_map_fd = -1, err = -EINVAL; + int i, cnt, index = -1, map_fd = -1, err = -EINVAL;

/* retrieve a fd of our prog_array map in BPF */ map_fd = skel_map_get_fd_by_id(jmp_table.map->id); - /* take an fd for the table of progs we monitor with SEC("fexit/bpf_prog_release") */ - progs_map_fd = skel_map_get_fd_by_id(jmp_table.prog_keys->id);

- if (map_fd < 0 || progs_map_fd < 0) { + if (map_fd < 0) { err = -EINVAL; goto out; } @@ -324,10 +321,15 @@ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog) if (err) goto out;

- /* insert the program in the prog list table */ - err = skel_map_update_elem(progs_map_fd, &prog, &cnt, 0); - if (err) - goto out; + /* + * The program has been safely inserted, decrement the reference count + * so it doesn't interfere with the number of actual user handles. + * This is safe to do because: + * - we overrite the put_ptr in the prog fd map + * - we also have a cleanup function that monitors when a program gets + * released and we manually do the cleanup in the prog fd map + */ + bpf_prog_sub(prog, 1);

/* return the index */ err = index; @@ -337,8 +339,6 @@ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog) __hid_bpf_do_release_prog(map_fd, index); if (map_fd >= 0) close_fd(map_fd); - if (progs_map_fd >= 0) - close_fd(progs_map_fd); return err; }

@@ -457,41 +457,38 @@ void __hid_bpf_destroy_device(struct hid_device *hdev) schedule_work(&release_work); }

-noinline bool -call_hid_bpf_prog_release(u64 prog_key, int table_cnt) +void call_hid_bpf_prog_put_deferred(struct work_struct *work) { - /* compare with how many refs are left in the bpf program */ - struct bpf_prog *prog = (struct bpf_prog *)prog_key; - int idx; - - if (!prog) - return false; + struct bpf_prog_aux *aux; + struct bpf_prog *prog; + bool found = false; + int i;

- if (atomic64_read(&prog->aux->refcnt) != table_cnt) - return false; + aux = container_of(work, struct bpf_prog_aux, work); + prog = aux->prog;

/* we don't need locking here because the entries in the progs table * are stable: * if there are other users (and the progs entries might change), we - * would return in the statement above. + * would simply not have been called. */ - for (idx = 0; idx < HID_BPF_MAX_PROGS; idx++) { - if (jmp_table.progs[idx] == prog) { - __clear_bit(idx, jmp_table.enabled); - break; + for (i = 0; i < HID_BPF_MAX_PROGS; i++) { + if (jmp_table.progs[i] == prog) { + __clear_bit(i, jmp_table.enabled); + found = true; } } - if (idx >= HID_BPF_MAX_PROGS) { - /* should never happen if we get our refcount right */ - idx = -1; - }

- /* schedule release of all detached progs */ - schedule_work(&release_work); - return idx >= 0; + if (found) + /* schedule release of all detached progs */ + schedule_work(&release_work); }

-#define HID_BPF_PROGS_COUNT 3 +static void hid_bpf_prog_fd_array_put_ptr(void *ptr) +{ +} + +#define HID_BPF_PROGS_COUNT 2

static struct bpf_link *links[HID_BPF_PROGS_COUNT]; static struct entrypoints_bpf *skel; @@ -501,9 +498,6 @@ void hid_bpf_free_links_and_skel(void) int i;

/* the following is enough to release all programs attached to hid */ - if (jmp_table.prog_keys) - bpf_map_put_with_uref(jmp_table.prog_keys); - if (jmp_table.map) bpf_map_put_with_uref(jmp_table.map);

@@ -533,6 +527,8 @@ void hid_bpf_free_links_and_skel(void) idx++; \ } while (0)

+static struct bpf_map_ops hid_bpf_prog_fd_maps_ops; + int hid_bpf_preload_skel(void) { int err, idx = 0; @@ -551,15 +547,14 @@ int hid_bpf_preload_skel(void) goto out; }

- jmp_table.prog_keys = bpf_map_get_with_uref(skel->maps.progs_map.map_fd); - if (IS_ERR(jmp_table.prog_keys)) { - err = PTR_ERR(jmp_table.prog_keys); - goto out; - } + /* our jump table is stealing refs, so we should not decrement on removal of elements */ + hid_bpf_prog_fd_maps_ops = *jmp_table.map->ops; + hid_bpf_prog_fd_maps_ops.map_fd_put_ptr = hid_bpf_prog_fd_array_put_ptr; + + jmp_table.map->ops = &hid_bpf_prog_fd_maps_ops;

ATTACH_AND_STORE_LINK(hid_tail_call); - ATTACH_AND_STORE_LINK(hid_prog_release); - ATTACH_AND_STORE_LINK(hid_free_inode); + ATTACH_AND_STORE_LINK(hid_bpf_prog_put_deferred);

return 0; out:

Use a different report with a bigger size and ensures we are doing things properly.

Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

---

changes in v11: - use the new facility from selftests/hid

no changes in v10

no changes in v9

no changes in v8

no changes in v7

no changes in v6

new in v5 --- tools/testing/selftests/hid/hid_bpf.c | 41 +++++++++++++++++++++++++ tools/testing/selftests/hid/progs/hid.c | 15 ++++++++- 2 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c index 3012fb95e6fc..a6daaadccfb5 100644 --- a/tools/testing/selftests/hid/hid_bpf.c +++ b/tools/testing/selftests/hid/hid_bpf.c @@ -23,6 +23,17 @@ static unsigned char rdesc[] = { 0xa1, 0x01, /* COLLECTION (Application) */ 0x09, 0x01, /* Usage (Vendor Usage 0x01) */ 0xa1, 0x00, /* COLLECTION (Physical) */ + 0x85, 0x02, /* REPORT_ID (2) */ + 0x19, 0x01, /* USAGE_MINIMUM (1) */ + 0x29, 0x08, /* USAGE_MAXIMUM (3) */ + 0x15, 0x00, /* LOGICAL_MINIMUM (0) */ + 0x25, 0xff, /* LOGICAL_MAXIMUM (255) */ + 0x95, 0x08, /* REPORT_COUNT (8) */ + 0x75, 0x08, /* REPORT_SIZE (8) */ + 0x81, 0x02, /* INPUT (Data,Var,Abs) */ + 0xc0, /* END_COLLECTION */ + 0x09, 0x01, /* Usage (Vendor Usage 0x01) */ + 0xa1, 0x00, /* COLLECTION (Physical) */ 0x85, 0x01, /* REPORT_ID (1) */ 0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */ 0x19, 0x01, /* USAGE_MINIMUM (1) */ @@ -646,6 +657,36 @@ TEST_F(hid_bpf, test_attach_detach) ASSERT_EQ(buf[2], 47); }

+/* + * Attach hid_change_report_id to the given uhid device, + * retrieve and open the matching hidraw node, + * inject one event in the uhid device, + * check that the program sees it and can change the data + */ +TEST_F(hid_bpf, test_hid_change_report) +{ + const struct test_program progs[] = { + { .name = "hid_change_report_id" }, + }; + u8 buf[10] = {0}; + int err; + + LOAD_PROGRAMS(progs); + + /* inject one event */ + buf[0] = 1; + buf[1] = 42; + uhid_send_event(_metadata, self->uhid_fd, buf, 6); + + /* read the data from hidraw */ + memset(buf, 0, sizeof(buf)); + err = read(self->hidraw_fd, buf, sizeof(buf)); + ASSERT_EQ(err, 9) TH_LOG("read_hidraw"); + ASSERT_EQ(buf[0], 2); + ASSERT_EQ(buf[1], 42); + ASSERT_EQ(buf[2], 0) TH_LOG("leftovers_from_previous_test"); +} + static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args) { diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c index fc0a4241643a..ee7529c47ad8 100644 --- a/tools/testing/selftests/hid/progs/hid.c +++ b/tools/testing/selftests/hid/progs/hid.c @@ -32,7 +32,20 @@ int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx)

rw_data[2] = rw_data[1] + 5;

- return 0; + return hid_ctx->size; +} + +SEC("?fmod_ret/hid_bpf_device_event") +int BPF_PROG(hid_change_report_id, struct hid_bpf_ctx *hid_ctx) +{ + __u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 3 /* size */); + + if (!rw_data) + return 0; /* EPERM check */ + + rw_data[0] = 2; + + return 9; }

SEC("syscall")

Add a new tracepoint hid_bpf_rdesc_fixup() so we can trigger a report descriptor fixup in the bpf world.

Whenever the program gets attached/detached, the device is reconnected meaning that userspace will see it disappearing and reappearing with the new report descriptor.

Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

---

no changes in v11

no changes in v10

no changes in v9

no changes in v8

no changes in v7

changes in v6: - use BTF_ID to get the btf_id of hid_bpf_rdesc_fixup

changes in v5: - adapted for new API

not in v4

changes in v3: - ensure the ctx.size is properly bounded by allocated size - s/link_attached/post_link_attach/ - removed the switch statement with only one case

changes in v2: - split the series by bpf/libbpf/hid/selftests and samples --- drivers/hid/bpf/hid_bpf_dispatch.c | 77 ++++++++++++++++++++++++++++- drivers/hid/bpf/hid_bpf_dispatch.h | 1 + drivers/hid/bpf/hid_bpf_jmp_table.c | 7 +++ drivers/hid/hid-core.c | 3 +- include/linux/hid_bpf.h | 8 +++ 5 files changed, 94 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c index c657222f914d..aea8019faca6 100644 --- a/drivers/hid/bpf/hid_bpf_dispatch.c +++ b/drivers/hid/bpf/hid_bpf_dispatch.c @@ -85,6 +85,63 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type } EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);

+/** + * hid_bpf_rdesc_fixup - Called when the probe function parses the report + * descriptor of the HID device + * + * @ctx: The HID-BPF context + * + * @return 0 on success and keep processing; a positive value to change the + * incoming size buffer; a negative error code to interrupt the processing + * of this event + * + * Declare an %fmod_ret tracing bpf program to this function and attach this + * program through hid_bpf_attach_prog() to have this helper called before any + * parsing of the report descriptor by HID. + */ +/* never used by the kernel but declared so we can load and attach a tracepoint */ +__weak noinline int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx) +{ + return 0; +} +ALLOW_ERROR_INJECTION(hid_bpf_rdesc_fixup, ERRNO); + +u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size) +{ + int ret; + struct hid_bpf_ctx_kern ctx_kern = { + .ctx = { + .hid = hdev, + .size = *size, + .allocated_size = HID_MAX_DESCRIPTOR_SIZE, + }, + }; + + ctx_kern.data = kmemdup(rdesc, ctx_kern.ctx.allocated_size, GFP_KERNEL); + if (!ctx_kern.data) + goto ignore_bpf; + + ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_RDESC_FIXUP, &ctx_kern); + if (ret < 0) + goto ignore_bpf; + + if (ret) { + if (ret > ctx_kern.ctx.allocated_size) + goto ignore_bpf; + + *size = ret; + } + + rdesc = krealloc(ctx_kern.data, *size, GFP_KERNEL); + + return rdesc; + + ignore_bpf: + kfree(ctx_kern.data); + return kmemdup(rdesc, *size, GFP_KERNEL); +} +EXPORT_SYMBOL_GPL(call_hid_bpf_rdesc_fixup); + /** * hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx * @@ -176,6 +233,14 @@ static int hid_bpf_allocate_event_data(struct hid_device *hdev) return __hid_bpf_allocate_data(hdev, &hdev->bpf.device_data, &hdev->bpf.allocated_data); }

+int hid_bpf_reconnect(struct hid_device *hdev) +{ + if (!test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status)) + return device_reprobe(&hdev->dev); + + return 0; +} + /** * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device * @@ -217,7 +282,17 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags) return err; }

- return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags); + err = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags); + if (err) + return err; + + if (prog_type == HID_BPF_PROG_TYPE_RDESC_FIXUP) { + err = hid_bpf_reconnect(hdev); + if (err) + return err; + } + + return 0; }

/** diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h index e2d64faa3932..2eeab1f746dd 100644 --- a/drivers/hid/bpf/hid_bpf_dispatch.h +++ b/drivers/hid/bpf/hid_bpf_dispatch.h @@ -18,6 +18,7 @@ int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_t void __hid_bpf_destroy_device(struct hid_device *hdev); int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type, struct hid_bpf_ctx_kern *ctx_kern); +int hid_bpf_reconnect(struct hid_device *hdev);

struct bpf_prog;

diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c index b78925f7fa81..17646ec28eab 100644 --- a/drivers/hid/bpf/hid_bpf_jmp_table.c +++ b/drivers/hid/bpf/hid_bpf_jmp_table.c @@ -58,12 +58,15 @@ static DECLARE_WORK(release_work, hid_bpf_release_progs);

BTF_ID_LIST(hid_bpf_btf_ids) BTF_ID(func, hid_bpf_device_event) /* HID_BPF_PROG_TYPE_DEVICE_EVENT */ +BTF_ID(func, hid_bpf_rdesc_fixup) /* HID_BPF_PROG_TYPE_RDESC_FIXUP */

static int hid_bpf_max_programs(enum hid_bpf_prog_type type) { switch (type) { case HID_BPF_PROG_TYPE_DEVICE_EVENT: return HID_BPF_MAX_PROGS_PER_DEV; + case HID_BPF_PROG_TYPE_RDESC_FIXUP: + return 1; default: return -EINVAL; } @@ -233,6 +236,10 @@ static void hid_bpf_release_progs(struct work_struct *work) if (next->hdev == hdev && next->type == type) next->hdev = NULL; } + + /* if type was rdesc fixup, reconnect device */ + if (type == HID_BPF_PROG_TYPE_RDESC_FIXUP) + hid_bpf_reconnect(hdev); } }

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 5dac2a1cc205..d4db0dcbdc10 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1218,7 +1218,8 @@ int hid_open_report(struct hid_device *device) return -ENODEV; size = device->dev_rsize;

- buf = kmemdup(start, size, GFP_KERNEL); + /* call_hid_bpf_rdesc_fixup() ensures we work on a copy of rdesc */ + buf = call_hid_bpf_rdesc_fixup(device, start, &size); if (buf == NULL) return -ENOMEM;

diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h index bf83d5811c51..18a98d2347bc 100644 --- a/include/linux/hid_bpf.h +++ b/include/linux/hid_bpf.h @@ -59,6 +59,7 @@ struct hid_bpf_ctx {

/* Following functions are tracepoints that BPF programs can attach to */ int hid_bpf_device_event(struct hid_bpf_ctx *ctx); +int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx);

/* Following functions are kfunc that we export to BPF programs */ /* available everywhere in HID-BPF */ @@ -85,6 +86,7 @@ int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx); enum hid_bpf_prog_type { HID_BPF_PROG_TYPE_UNDEF = -1, HID_BPF_PROG_TYPE_DEVICE_EVENT, /* an event is emitted from the device */ + HID_BPF_PROG_TYPE_RDESC_FIXUP, HID_BPF_PROG_TYPE_MAX, };

@@ -128,6 +130,7 @@ int hid_bpf_connect_device(struct hid_device *hdev); void hid_bpf_disconnect_device(struct hid_device *hdev); void hid_bpf_destroy_device(struct hid_device *hid); void hid_bpf_device_init(struct hid_device *hid); +u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size); #else /* CONFIG_HID_BPF */ static inline u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data, u32 *size, int interrupt) { return 0; } @@ -135,6 +138,11 @@ static inline int hid_bpf_connect_device(struct hid_device *hdev) { return 0; } static inline void hid_bpf_disconnect_device(struct hid_device *hdev) {} static inline void hid_bpf_destroy_device(struct hid_device *hid) {} static inline void hid_bpf_device_init(struct hid_device *hid) {} +static inline u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size) +{ + return kmemdup(rdesc, *size, GFP_KERNEL); +} + #endif /* CONFIG_HID_BPF */

#endif /* __HID_BPF_H */

Insert 3 programs to check that we are doing the correct thing: '2', '1', '3' are inserted, but '1' is supposed to be executed first.

Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

---

changes in v11: - use the new facility from selftests/hid

no changes in v10

no changes in v9

no changes in v8

no changes in v7

changes in v6: - fixed copy/paste in ASSERT_OK and test execution order

changes in v5: - use the new API

not in v4

changes in v3: - use the new hid_get_data API

new in v2 --- tools/testing/selftests/hid/hid_bpf.c | 43 ++++++++++++++++++++ tools/testing/selftests/hid/progs/hid.c | 54 ++++++++++++++++++++++++- 2 files changed, 96 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c index fc2ad0443803..14548a558d9e 100644 --- a/tools/testing/selftests/hid/hid_bpf.c +++ b/tools/testing/selftests/hid/hid_bpf.c @@ -88,6 +88,7 @@ static u8 feature_data[] = { 1, 2 }; struct attach_prog_args { int prog_fd; unsigned int hid; + unsigned int flags; int retval; };

@@ -491,6 +492,7 @@ FIXTURE_SETUP(hid_bpf)

struct test_program { const char *name; + unsigned int flags; }; #define LOAD_PROGRAMS(progs) \ load_programs(progs, ARRAY_SIZE(progs), _metadata, self, variant) @@ -540,6 +542,7 @@ static void load_programs(const struct test_program programs[],

args.prog_fd = bpf_program__fd(prog); args.hid = self->hid_id; + args.flags = programs[i].flags; err = bpf_prog_test_run_opts(attach_fd, &tattr); ASSERT_OK(args.retval) TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval); } @@ -741,6 +744,46 @@ TEST_F(hid_bpf, test_hid_user_raw_request_call) ASSERT_EQ(args.data[1], 2); }

+/* + * Attach hid_insert{0,1,2} to the given uhid device, + * retrieve and open the matching hidraw node, + * inject one event in the uhid device, + * check that the programs have been inserted in the correct order. + */ +TEST_F(hid_bpf, test_hid_attach_flags) +{ + const struct test_program progs[] = { + { + .name = "hid_test_insert2", + .flags = HID_BPF_FLAG_NONE, + }, + { + .name = "hid_test_insert1", + .flags = HID_BPF_FLAG_INSERT_HEAD, + }, + { + .name = "hid_test_insert3", + .flags = HID_BPF_FLAG_NONE, + }, + }; + u8 buf[10] = {0}; + int err; + + LOAD_PROGRAMS(progs); + + /* inject one event */ + buf[0] = 1; + uhid_send_event(_metadata, self->uhid_fd, buf, 6); + + /* read the data from hidraw */ + memset(buf, 0, sizeof(buf)); + err = read(self->hidraw_fd, buf, sizeof(buf)); + ASSERT_EQ(err, 6) TH_LOG("read_hidraw"); + ASSERT_EQ(buf[1], 1); + ASSERT_EQ(buf[2], 2); + ASSERT_EQ(buf[3], 3); +} + /* * Attach hid_rdesc_fixup to the given uhid device, * retrieve and open the matching hidraw node, diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c index 815ff94321c9..eb869a80c254 100644 --- a/tools/testing/selftests/hid/progs/hid.c +++ b/tools/testing/selftests/hid/progs/hid.c @@ -21,6 +21,7 @@ extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx, struct attach_prog_args { int prog_fd; unsigned int hid; + unsigned int flags; int retval; };

@@ -60,7 +61,7 @@ int attach_prog(struct attach_prog_args *ctx) { ctx->retval = hid_bpf_attach_prog(ctx->hid, ctx->prog_fd, - 0); + ctx->flags); return 0; }

@@ -152,3 +153,54 @@ int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hid_ctx)

return sizeof(rdesc) + 73; } + +SEC("?fmod_ret/hid_bpf_device_event") +int BPF_PROG(hid_test_insert1, struct hid_bpf_ctx *hid_ctx) +{ + __u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */); + + if (!data) + return 0; /* EPERM check */ + + /* we need to be run first */ + if (data[2] || data[3]) + return -1; + + data[1] = 1; + + return 0; +} + +SEC("?fmod_ret/hid_bpf_device_event") +int BPF_PROG(hid_test_insert2, struct hid_bpf_ctx *hid_ctx) +{ + __u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */); + + if (!data) + return 0; /* EPERM check */ + + /* after insert0 and before insert2 */ + if (!data[1] || data[3]) + return -1; + + data[2] = 2; + + return 0; +} + +SEC("?fmod_ret/hid_bpf_device_event") +int BPF_PROG(hid_test_insert3, struct hid_bpf_ctx *hid_ctx) +{ + __u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */); + + if (!data) + return 0; /* EPERM check */ + + /* at the end */ + if (!data[1] || !data[2]) + return -1; + + data[3] = 3; + + return 0; +}

Add a more complete HID-BPF example.

Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

---

changes in v11: - use samples/hid instead of samples/bpf

no changes in v10

changes in v9: - extend the usage section - add sleep while waiting - changed the title of the commit

no changes in v8

changes in v7: - remove unnecessary __must_check definition

new in v6 --- samples/hid/.gitignore | 1 + samples/hid/Makefile | 5 +- samples/hid/hid_surface_dial.bpf.c | 161 ++++++++++++++++++++ samples/hid/hid_surface_dial.c | 231 +++++++++++++++++++++++++++++ 4 files changed, 397 insertions(+), 1 deletion(-) create mode 100644 samples/hid/hid_surface_dial.bpf.c create mode 100644 samples/hid/hid_surface_dial.c

diff --git a/samples/hid/.gitignore b/samples/hid/.gitignore index 8cb45592e29a..3ea0fed3bbad 100644 --- a/samples/hid/.gitignore +++ b/samples/hid/.gitignore @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only hid_mouse +hid_surface_dial *.out *.skel.h /vmlinux.h diff --git a/samples/hid/Makefile b/samples/hid/Makefile index f52b2d811976..e8d9f1451b9e 100644 --- a/samples/hid/Makefile +++ b/samples/hid/Makefile @@ -7,6 +7,7 @@ pound := #

# List of programs to build tprogs-y += hid_mouse +tprogs-y += hid_surface_dial

# Libbpf dependencies LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf @@ -16,6 +17,7 @@ LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a

hid_mouse-objs := hid_mouse.o +hid_surface_dial-objs := hid_surface_dial.o

# Tell kbuild to always build the programs always-y := $(tprogs-y) @@ -153,6 +155,7 @@ libbpf_hdrs: $(LIBBPF) .PHONY: libbpf_hdrs

$(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h +$(obj)/hid_surface_dial.o: $(obj)/hid_surface_dial.skel.h

-include $(HID_SAMPLES_PATH)/Makefile.target

@@ -197,7 +200,7 @@ $(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \ -c $(filter %.bpf.c,$^) -o $@

-LINKED_SKELS := hid_mouse.skel.h +LINKED_SKELS := hid_mouse.skel.h hid_surface_dial.skel.h clean-files += $(LINKED_SKELS)

hid_mouse.skel.h-deps := hid_mouse.bpf.o diff --git a/samples/hid/hid_surface_dial.bpf.c b/samples/hid/hid_surface_dial.bpf.c new file mode 100644 index 000000000000..16c821d3decf --- /dev/null +++ b/samples/hid/hid_surface_dial.bpf.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2022 Benjamin Tissoires + */ + +#include "vmlinux.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +#define HID_UP_BUTTON 0x0009 +#define HID_GD_WHEEL 0x0038 + +/* following are kfuncs exported by HID for HID-BPF */ +extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, + unsigned int offset, + const size_t __sz) __ksym; +extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym; +extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym; +extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym; +extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx, + __u8 *data, + size_t buf__sz, + enum hid_report_type type, + enum hid_class_request reqtype) __ksym; + +struct attach_prog_args { + int prog_fd; + unsigned int hid; + int retval; +}; + +SEC("syscall") +int attach_prog(struct attach_prog_args *ctx) +{ + ctx->retval = hid_bpf_attach_prog(ctx->hid, + ctx->prog_fd, + 0); + return 0; +} + +SEC("fmod_ret/hid_bpf_device_event") +int BPF_PROG(hid_event, struct hid_bpf_ctx *hctx) +{ + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */); + + if (!data) + return 0; /* EPERM check */ + + /* Touch */ + data[1] &= 0xfd; + + /* X */ + data[4] = 0; + data[5] = 0; + + /* Y */ + data[6] = 0; + data[7] = 0; + + return 0; +} + +/* 72 == 360 / 5 -> 1 report every 5 degrees */ +int resolution = 72; +int physical = 5; + +struct haptic_syscall_args { + unsigned int hid; + int retval; +}; + +static __u8 haptic_data[8]; + +SEC("syscall") +int set_haptic(struct haptic_syscall_args *args) +{ + struct hid_bpf_ctx *ctx; + const size_t size = sizeof(haptic_data); + u16 *res; + int ret; + + if (size > sizeof(haptic_data)) + return -7; /* -E2BIG */ + + ctx = hid_bpf_allocate_context(args->hid); + if (!ctx) + return -1; /* EPERM check */ + + haptic_data[0] = 1; /* report ID */ + + ret = hid_bpf_hw_request(ctx, haptic_data, size, HID_FEATURE_REPORT, HID_REQ_GET_REPORT); + + bpf_printk("probed/remove event ret value: %d", ret); + bpf_printk("buf: %02x %02x %02x", + haptic_data[0], + haptic_data[1], + haptic_data[2]); + bpf_printk(" %02x %02x %02x", + haptic_data[3], + haptic_data[4], + haptic_data[5]); + bpf_printk(" %02x %02x", + haptic_data[6], + haptic_data[7]); + + /* whenever resolution multiplier is not 3600, we have the fixed report descriptor */ + res = (u16 *)&haptic_data[1]; + if (*res != 3600) { +// haptic_data[1] = 72; /* resolution multiplier */ +// haptic_data[2] = 0; /* resolution multiplier */ +// haptic_data[3] = 0; /* Repeat Count */ + haptic_data[4] = 3; /* haptic Auto Trigger */ +// haptic_data[5] = 5; /* Waveform Cutoff Time */ +// haptic_data[6] = 80; /* Retrigger Period */ +// haptic_data[7] = 0; /* Retrigger Period */ + } else { + haptic_data[4] = 0; + } + + ret = hid_bpf_hw_request(ctx, haptic_data, size, HID_FEATURE_REPORT, HID_REQ_SET_REPORT); + + bpf_printk("set haptic ret value: %d -> %d", ret, haptic_data[4]); + + args->retval = ret; + + hid_bpf_release_context(ctx); + + return 0; +} + +/* Convert REL_DIAL into REL_WHEEL */ +SEC("fmod_ret/hid_bpf_rdesc_fixup") +int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx) +{ + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */); + __u16 *res, *phys; + + if (!data) + return 0; /* EPERM check */ + + /* Convert TOUCH into a button */ + data[31] = HID_UP_BUTTON; + data[33] = 2; + + /* Convert REL_DIAL into REL_WHEEL */ + data[45] = HID_GD_WHEEL; + + /* Change Resolution Multiplier */ + phys = (__u16 *)&data[61]; + *phys = physical; + res = (__u16 *)&data[66]; + *res = resolution; + + /* Convert X,Y from Abs to Rel */ + data[88] = 0x06; + data[98] = 0x06; + + return 0; +} + +char _license[] SEC("license") = "GPL"; +u32 _version SEC("version") = 1; diff --git a/samples/hid/hid_surface_dial.c b/samples/hid/hid_surface_dial.c new file mode 100644 index 000000000000..fda6964e3adc --- /dev/null +++ b/samples/hid/hid_surface_dial.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2022 Benjamin Tissoires + * + * This program will morph the Microsoft Surface Dial into a mouse, + * and depending on the chosen resolution enable or not the haptic feedback: + * - a resolution (-r) of 3600 will report 3600 "ticks" in one full rotation + * wihout haptic feedback + * - any other resolution will report N "ticks" in a full rotation with haptic + * feedback + * + * A good default for low resolution haptic scrolling is 72 (1 "tick" every 5 + * degrees), and set to 3600 for smooth scrolling. + */ + +#include <assert.h> +#include <errno.h> +#include <fcntl.h> +#include <libgen.h> +#include <signal.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/resource.h> +#include <unistd.h> + +#include <linux/bpf.h> +#include <linux/errno.h> + +#include <bpf/bpf.h> +#include <bpf/libbpf.h> + +#include "hid_surface_dial.skel.h" + +static bool running = true; + +struct attach_prog_args { + int prog_fd; + unsigned int hid; + int retval; +}; + +struct haptic_syscall_args { + unsigned int hid; + int retval; +}; + +static void int_exit(int sig) +{ + running = false; + exit(0); +} + +static void usage(const char *prog) +{ + fprintf(stderr, + "%s: %s [OPTIONS] /sys/bus/hid/devices/0BUS:0VID:0PID:00ID\n\n" + " OPTIONS:\n" + " -r N\t set the given resolution to the device (number of ticks per 360°)\n\n", + __func__, prog); + fprintf(stderr, + "This program will morph the Microsoft Surface Dial into a mouse,\n" + "and depending on the chosen resolution enable or not the haptic feedback:\n" + "- a resolution (-r) of 3600 will report 3600 'ticks' in one full rotation\n" + " wihout haptic feedback\n" + "- any other resolution will report N 'ticks' in a full rotation with haptic\n" + " feedback\n" + "\n" + "A good default for low resolution haptic scrolling is 72 (1 'tick' every 5\n" + "degrees), and set to 3600 for smooth scrolling.\n"); +} + +static int get_hid_id(const char *path) +{ + const char *str_id, *dir; + char uevent[1024]; + int fd; + + memset(uevent, 0, sizeof(uevent)); + snprintf(uevent, sizeof(uevent) - 1, "%s/uevent", path); + + fd = open(uevent, O_RDONLY | O_NONBLOCK); + if (fd < 0) + return -ENOENT; + + close(fd); + + dir = basename((char *)path); + + str_id = dir + sizeof("0003:0001:0A37."); + return (int)strtol(str_id, NULL, 16); +} + +static int attach_prog(struct hid_surface_dial *skel, struct bpf_program *prog, int hid_id) +{ + struct attach_prog_args args = { + .hid = hid_id, + .retval = -1, + }; + int attach_fd, err; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr, + .ctx_in = &args, + .ctx_size_in = sizeof(args), + ); + + attach_fd = bpf_program__fd(skel->progs.attach_prog); + if (attach_fd < 0) { + fprintf(stderr, "can't locate attach prog: %m\n"); + return 1; + } + + args.prog_fd = bpf_program__fd(prog); + err = bpf_prog_test_run_opts(attach_fd, &tattr); + if (err) { + fprintf(stderr, "can't attach prog to hid device %d: %m (err: %d)\n", + hid_id, err); + return 1; + } + return 0; +} + +static int set_haptic(struct hid_surface_dial *skel, int hid_id) +{ + struct haptic_syscall_args args = { + .hid = hid_id, + .retval = -1, + }; + int haptic_fd, err; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr, + .ctx_in = &args, + .ctx_size_in = sizeof(args), + ); + + haptic_fd = bpf_program__fd(skel->progs.set_haptic); + if (haptic_fd < 0) { + fprintf(stderr, "can't locate haptic prog: %m\n"); + return 1; + } + + err = bpf_prog_test_run_opts(haptic_fd, &tattr); + if (err) { + fprintf(stderr, "can't set haptic configuration to hid device %d: %m (err: %d)\n", + hid_id, err); + return 1; + } + return 0; +} + +int main(int argc, char **argv) +{ + struct hid_surface_dial *skel; + struct bpf_program *prog; + const char *optstr = "r:"; + const char *sysfs_path; + int opt, hid_id, resolution = 72; + + while ((opt = getopt(argc, argv, optstr)) != -1) { + switch (opt) { + case 'r': + { + char *endp = NULL; + long l = -1; + + if (optarg) { + l = strtol(optarg, &endp, 10); + if (endp && *endp) + l = -1; + } + + if (l < 0) { + fprintf(stderr, + "invalid r option %s - expecting a number\n", + optarg ? optarg : ""); + exit(EXIT_FAILURE); + }; + + resolution = (int) l; + break; + } + default: + usage(basename(argv[0])); + return 1; + } + } + + if (optind == argc) { + usage(basename(argv[0])); + return 1; + } + + sysfs_path = argv[optind]; + if (!sysfs_path) { + perror("sysfs"); + return 1; + } + + skel = hid_surface_dial__open_and_load(); + if (!skel) { + fprintf(stderr, "%s %s:%d", __func__, __FILE__, __LINE__); + return -1; + } + + hid_id = get_hid_id(sysfs_path); + if (hid_id < 0) { + fprintf(stderr, "can not open HID device: %m\n"); + return 1; + } + + skel->data->resolution = resolution; + skel->data->physical = (int)(resolution / 72); + + bpf_object__for_each_program(prog, *skel->skeleton->obj) { + /* ignore syscalls */ + if (bpf_program__get_type(prog) != BPF_PROG_TYPE_TRACING) + continue; + + attach_prog(skel, prog, hid_id); + } + + signal(SIGINT, int_exit); + signal(SIGTERM, int_exit); + + set_haptic(skel, hid_id); + + while (running) + sleep(1); + + hid_surface_dial__destroy(skel); + + return 0; +}