From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 40F52200110 for ; Mon, 19 Jan 2026 03:26:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768793219; cv=none; b=kx+IEE9+BoE597LaFICSFP8I8aBRI40fXneHJ8tEz144l8eUKwTLi3Lp2BCI5mXLpft4rDUSpMqj3yfZTCL9wZ3qktufAGnYtbzpo4WJWKwUXDAomF4vpTm9wudQDSENZyrOdCbk4mlvufWvRWhZ3V+QoMxyvLosk6fgLqv5918= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768793219; c=relaxed/simple; bh=3/Qlr9L7k0tcagEBAbUvz0VouVI3Sa9U76WDviaimMk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HXZCEI4K7sXadvuMsw1JgRQR/4RNJI/x7FVASye1yyVl1tvZA9CRHaG8ojEQPGNFDz/ysL7Xa7vWcNYMwMgVpBztYzCB9ZtQOoKwQlR1V2zmQAe5Cx/HvGqR5tOt9gQt/d51mn8Xz/hnobqQeXvHhW/qJYP9yWE07WZa8q+Dysk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=QampTy1z; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="QampTy1z" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1768793216; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=RnvK8l1NqmawWFSFXm69VvHCytbxPLgXNePZ3QGgOmc=; b=QampTy1zTMM4GHBUDo/zkGBo6tlCSADgbytzvNuf3dmsSimbfdiSlVMGsZxl0AZxTCe9V7 5O655Dgc2uj5280qWQR+XVMTWTZkJePNlgKzGQ8WwEMiR3glodNFr0GYFrc6rS4CSAXjgL uIj/mVIWEXBfTWotV7US/aJF9zlkR6c= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-248-7S5UM6nvP2y4Edswv6xLmw-1; Sun, 18 Jan 2026 22:26:52 -0500 X-MC-Unique: 7S5UM6nvP2y4Edswv6xLmw-1 X-Mimecast-MFC-AGG-ID: 7S5UM6nvP2y4Edswv6xLmw_1768793210 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0743F19560A2; Mon, 19 Jan 2026 03:26:50 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.72.112.74]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id AEA401955F22; Mon, 19 Jan 2026 03:26:38 +0000 (UTC) From: Pingfan Liu To: kexec@lists.infradead.org Cc: Pingfan Liu , "David S. Miller" , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , Jeremy Linton , Catalin Marinas , Will Deacon , Ard Biesheuvel , Simon Horman , Gerd Hoffmann , Vitaly Kuznetsov , Philipp Rudo , Viktor Malik , Jan Hendrik Farr , Baoquan He , Dave Young , Andrew Morton , bpf@vger.kernel.org, systemd-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCHv6 08/13] kexec_file: Introduce a bpf-prog lskel to parse PE file Date: Mon, 19 Jan 2026 11:24:19 +0800 Message-ID: <20260119032424.10781-9-piliu@redhat.com> In-Reply-To: <20260119032424.10781-1-piliu@redhat.com> References: <20260119032424.10781-1-piliu@redhat.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Analague to kernel/bpf/preload/iterators/Makefile, this Makefile is not invoked by the Kbuild system. It needs to be invoked manually when kexec_pe_parser_bpf.c is changed so that kexec_pe_parser_bpf.lskel.h can be re-generated by the command "bpftool gen skeleton -L kexec_pe_parser_bpf.o". kexec_pe_parser_bpf.lskel.h is used directly by the kernel kexec code in later patch. For this patch, there are bpf bytecode contained in opts_data[] and opts_insn[] in kexec_pe_parser_bpf.lskel.h, but in the following patch, they will be removed and only the function API in kexec_pe_parser_bpf.lskel.h left. As exposed in kexec_pe_parser_bpf.lskel.h, the interface between bpf-prog and the kernel are constituted by: four maps: struct bpf_map_desc ringbuf_1; struct bpf_map_desc ringbuf_2; struct bpf_map_desc ringbuf_3; struct bpf_map_desc ringbuf_4; four sections: struct bpf_map_desc rodata; struct bpf_map_desc data; struct bpf_map_desc rodata_str1_1; struct bpf_map_desc bss; one prog: SEC("fentry.s/kexec_image_parser_anchor") The interface of maps and sections are extracted in template.c, which should be included by any bpf-prog to interact with kexec_bpf component Signed-off-by: Pingfan Liu Cc: Alexei Starovoitov Cc: Baoquan He Cc: Dave Young Cc: Andrew Morton Cc: Philipp Rudo Cc: bpf@vger.kernel.org To: kexec@lists.infradead.org --- kernel/kexec_bpf/Makefile | 62 ++++ kernel/kexec_bpf/kexec_pe_parser_bpf.c | 12 + kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h | 372 +++++++++++++++++++ kernel/kexec_bpf/template.c | 68 ++++ 4 files changed, 514 insertions(+) create mode 100644 kernel/kexec_bpf/Makefile create mode 100644 kernel/kexec_bpf/kexec_pe_parser_bpf.c create mode 100644 kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h create mode 100644 kernel/kexec_bpf/template.c diff --git a/kernel/kexec_bpf/Makefile b/kernel/kexec_bpf/Makefile new file mode 100644 index 0000000000000..45d45cc0855a3 --- /dev/null +++ b/kernel/kexec_bpf/Makefile @@ -0,0 +1,62 @@ +# SPDX-License-Identifier: GPL-2.0 +OUTPUT := .output +CLANG ?= clang +LLC ?= llc +LLVM_STRIP ?= llvm-strip +DEFAULT_BPFTOOL := $(OUTPUT)/sbin/bpftool +BPFTOOL ?= $(DEFAULT_BPFTOOL) +LIBBPF_SRC := $(abspath ../../tools/lib/bpf) +BPFOBJ := $(OUTPUT)/libbpf.a +BPF_INCLUDE := $(OUTPUT) +INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../tools/lib) \ + -I$(abspath ../../tools/include/uapi) +CFLAGS := -g -Wall + +srctree := $(patsubst %/kernel/kexec_bpf,%,$(CURDIR)) +VMLINUX = $(srctree)/vmlinux + +abs_out := $(abspath $(OUTPUT)) +ifeq ($(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: $(OUTPUT) kexec_pe_parser_bpf.lskel.h + +clean: + $(call msg,CLEAN) + $(Q)rm -rf $(OUTPUT) kexec_pe_parser_bpf.lskel.h + +kexec_pe_parser_bpf.lskel.h: $(OUTPUT)/kexec_pe_parser_bpf.o | $(BPFTOOL) + $(call msg,GEN-SKEL,$@) + $(Q)$(BPFTOOL) gen skeleton -L $< > $@ + +$(OUTPUT)/vmlinux.h: $(VMLINUX) $(DEFAULT_BPFTOOL) $(BPFOBJ) | $(OUTPUT) + @$(BPFTOOL) btf dump file $(VMLINUX) format c > $(OUTPUT)/vmlinux.h + +$(OUTPUT)/kexec_pe_parser_bpf.o: kexec_pe_parser_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): + $(call msg,MKDIR,$@) + $(Q)mkdir -p $(OUTPUT) + +$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT) + $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \ + OUTPUT=$(abspath $(dir $@))/ $(abspath $@) + +$(DEFAULT_BPFTOOL): + $(Q)$(MAKE) $(submake_extras) -C ../../tools/bpf/bpftool \ + prefix= OUTPUT=$(abs_out)/ DESTDIR=$(abs_out) install diff --git a/kernel/kexec_bpf/kexec_pe_parser_bpf.c b/kernel/kexec_bpf/kexec_pe_parser_bpf.c new file mode 100644 index 0000000000000..e4a2419240673 --- /dev/null +++ b/kernel/kexec_bpf/kexec_pe_parser_bpf.c @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (C) 2025, 2026 Red Hat, Inc + +#include "template.c" + +SEC("fentry.s/kexec_image_parser_anchor") +__attribute__((used)) int BPF_PROG(parse_pe, struct kexec_context *context, + unsigned long parser_id) +{ + return 0; +} diff --git a/kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h b/kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h new file mode 100644 index 0000000000000..d1e863fd0ff4f --- /dev/null +++ b/kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h @@ -0,0 +1,372 @@ +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ +/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */ +#ifndef __KEXEC_PE_PARSER_BPF_SKEL_H__ +#define __KEXEC_PE_PARSER_BPF_SKEL_H__ + +#include + +struct kexec_pe_parser_bpf { + struct bpf_loader_ctx ctx; + struct { + struct bpf_map_desc ringbuf_1; + struct bpf_map_desc ringbuf_2; + struct bpf_map_desc ringbuf_3; + struct bpf_map_desc ringbuf_4; + struct bpf_map_desc rodata; + struct bpf_map_desc data; + struct bpf_map_desc bss; + struct bpf_map_desc rodata_str1_1; + } maps; + struct { + struct bpf_prog_desc parse_pe; + } progs; + struct { + int parse_pe_fd; + } links; +}; + +static inline int +kexec_pe_parser_bpf__parse_pe__attach(struct kexec_pe_parser_bpf *skel) +{ + int prog_fd = skel->progs.parse_pe.prog_fd; + int fd = skel_raw_tracepoint_open(NULL, prog_fd); + + if (fd > 0) + skel->links.parse_pe_fd = fd; + return fd; +} + +static inline int +kexec_pe_parser_bpf__attach(struct kexec_pe_parser_bpf *skel) +{ + int ret = 0; + + ret = ret < 0 ? ret : kexec_pe_parser_bpf__parse_pe__attach(skel); + return ret < 0 ? ret : 0; +} + +static inline void +kexec_pe_parser_bpf__detach(struct kexec_pe_parser_bpf *skel) +{ + skel_closenz(skel->links.parse_pe_fd); +} +static void +kexec_pe_parser_bpf__destroy(struct kexec_pe_parser_bpf *skel) +{ + if (!skel) + return; + kexec_pe_parser_bpf__detach(skel); + skel_closenz(skel->progs.parse_pe.prog_fd); + skel_closenz(skel->maps.ringbuf_1.map_fd); + skel_closenz(skel->maps.ringbuf_2.map_fd); + skel_closenz(skel->maps.ringbuf_3.map_fd); + skel_closenz(skel->maps.ringbuf_4.map_fd); + skel_closenz(skel->maps.rodata.map_fd); + skel_closenz(skel->maps.data.map_fd); + skel_closenz(skel->maps.bss.map_fd); + skel_closenz(skel->maps.rodata_str1_1.map_fd); + skel_free(skel); +} +static inline struct kexec_pe_parser_bpf * +kexec_pe_parser_bpf__open(void) +{ + struct kexec_pe_parser_bpf *skel; + + skel = skel_alloc(sizeof(*skel)); + if (!skel) + goto cleanup; + skel->ctx.sz = (void *)&skel->links - (void *)skel; + return skel; +cleanup: + kexec_pe_parser_bpf__destroy(skel); + return NULL; +} + +static inline int +kexec_pe_parser_bpf__load(struct kexec_pe_parser_bpf *skel) +{ + struct bpf_load_and_run_opts opts = {}; + int err; + static const char opts_data[] __attribute__((__aligned__(8))) = "\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\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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+\x61\x10\0\0\0\0\0\0\x63\x06\x58\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x14\0\0\ +\0\x61\x10\0\0\0\0\0\0\x63\x06\x68\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x18\0\ +\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x78\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x1c\ +\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x88\0\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\ +\0\0\0"; + opts.ctx = (struct bpf_loader_ctx *)skel; + opts.data_sz = sizeof(opts_data) - 1; + opts.data = (void *)opts_data; + opts.insns_sz = sizeof(opts_insn) - 1; + opts.insns = (void *)opts_insn; + + err = bpf_load_and_run(&opts); + if (err < 0) + return err; + return 0; +} + +static inline struct kexec_pe_parser_bpf * +kexec_pe_parser_bpf__open_and_load(void) +{ + struct kexec_pe_parser_bpf *skel; + + skel = kexec_pe_parser_bpf__open(); + if (!skel) + return NULL; + if (kexec_pe_parser_bpf__load(skel)) { + kexec_pe_parser_bpf__destroy(skel); + return NULL; + } + return skel; +} + +__attribute__((unused)) static void +kexec_pe_parser_bpf__assert(struct kexec_pe_parser_bpf *s __attribute__((unused))) +{ +#ifdef __cplusplus +#define _Static_assert static_assert +#endif +#ifdef __cplusplus +#undef _Static_assert +#endif +} + +#endif /* __KEXEC_PE_PARSER_BPF_SKEL_H__ */ diff --git a/kernel/kexec_bpf/template.c b/kernel/kexec_bpf/template.c new file mode 100644 index 0000000000000..9f17a4952ecd4 --- /dev/null +++ b/kernel/kexec_bpf/template.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (C) 2026 Red Hat, Inc +// +// Original file: kernel/kexec_bpf/template.c +// +#include "vmlinux.h" +#include +#include +#include +#include + +/* Command to kernel kexec bpf loader, which is defined on the stream */ +#define KEXEC_BPF_CMD_DECOMPRESS 0x1 +#define KEXEC_BPF_CMD_COPY 0x2 + +#define KEXEC_BPF_SUBCMD_KERNEL 0x1 +#define KEXEC_BPF_SUBCMD_INITRD 0x2 +#define KEXEC_BPF_SUBCMD_CMDLINE 0x3 + +/* + * The ringbufs can have different capacity. But only four ringbuf are provided. + */ +#ifndef RINGBUF1_SIZE +#define RINGBUF1_SIZE 4 +#endif +#ifndef RINGBUF2_SIZE +#define RINGBUF2_SIZE 4 +#endif +#ifndef RINGBUF3_SIZE +#define RINGBUF3_SIZE 4 +#endif +#ifndef RINGBUF4_SIZE +#define RINGBUF4_SIZE 4 +#endif + +/* ringbuf is safe since the user space has no write access to them */ +struct { + __uint(type, BPF_MAP_TYPE_RINGBUF); + __uint(max_entries, RINGBUF1_SIZE); +} ringbuf_1 SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_RINGBUF); + __uint(max_entries, RINGBUF2_SIZE); +} ringbuf_2 SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_RINGBUF); + __uint(max_entries, RINGBUF3_SIZE); +} ringbuf_3 SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_RINGBUF); + __uint(max_entries, RINGBUF4_SIZE); +} ringbuf_4 SEC(".maps"); + +char LICENSE[] SEC("license") = "GPL"; + +/* + * This function ensures that the sections .rodata, .data, .rodata.str1.1 and .bss + * are created for a bpf prog. + */ +static const char dummy_rodata[16] __attribute__((used)) = "rodata"; +static char dummy_data[16] __attribute__((used)) = "data"; +static char *dummy_mergeable_str __attribute__((used)) = ".rodata.str1.1"; +static char dummy_bss[16] __attribute__((used)); + -- 2.49.0