From patchwork Mon Jun 17 16:30:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxwell Bland X-Patchwork-Id: 13701042 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mx0b-00823401.pphosted.com (mx0b-00823401.pphosted.com [148.163.152.46]) (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 ED0A715B977; Mon, 17 Jun 2024 16:31:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.152.46 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718641884; cv=none; b=f5LPUQcuQHSKMUZYOyb4XOWHfR0hxZwOslDLA+sIB7FfG8vzBCqZ6UdiL7Mpk3lfpYf5r18kJhbf8Gr56QLTfv2nPhekG27x3kN4vCReRBZiLvasEytZCbEijQST/r+HTqo5DaaocUt/s/RSOqIQ2redL5FW5tYbuMCvZjRMk7E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718641884; c=relaxed/simple; bh=Bjuj+h31fXZSJTP947nQ6wd95zco9N/KLLRlENy27RI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Mv/l6GaNhsEvjRRUHZS5IuXZ4lqa/7WXU1Zf8hmcZ4CMocVtiJP7V/BRHY9V3ixVcbzan8YtRHQVgScIgC6gl62Wu69/38/KoZGysN7WKToQD3mylpNVJmit/gyL/LrZ68t5Wx6PLPM5L78EkvMbEejPgRNdoxJ6YdJxVOy4ea8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=motorola.com; spf=pass smtp.mailfrom=motorola.com; dkim=pass (2048-bit key) header.d=motorola.com header.i=@motorola.com header.b=HKHjAvgw; arc=none smtp.client-ip=148.163.152.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=motorola.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=motorola.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=motorola.com header.i=@motorola.com header.b="HKHjAvgw" Received: from pps.filterd (m0355091.ppops.net [127.0.0.1]) by mx0b-00823401.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45HCpubM016217; Mon, 17 Jun 2024 16:30:58 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=motorola.com; h= cc:content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=DKIM202306; bh=8WJALL82Sk9HW31XdlI5/qJ F14ASSC7G53mFaIDlTHE=; b=HKHjAvgw/QeP2J753/bTERhco/ZjJ1mkbQd/cbN wwkDTQg11XVaI7iZEGLNB+cUSUSbI+hq3LCh1m4LiqX9OsdOQSMk+bS2d8q56Mhi neCeQOffMtj+AoWOQz1bBriN7E5ONQKuNLYasb1Exl47xeTmrsEXF2KcV75JnlL0 TAVFRKVIlxTwjyKynZ2D9Ts2wQr2P2Nzo5Q1gTpUDG01muWroEewPZMME/E5/qBu itSMxfboZ5cxojvio9JgvCU29ifQaHSiaAJ+AU1YMtTs+VfpRPEfbW735WW4JNsn NbZAhbLV7wNLUrSj3VS/ge7V2yuTBenxrhSitO/ezKVGDaw== Received: from va32lpfpp04.lenovo.com ([104.232.228.24]) by mx0b-00823401.pphosted.com (PPS) with ESMTPS id 3ysr2gjvrk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Jun 2024 16:30:57 +0000 (GMT) Received: from va32lmmrp01.lenovo.com (va32lmmrp01.mot.com [10.62.177.113]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by va32lpfpp04.lenovo.com (Postfix) with ESMTPS id 4W2wNx1VSnzg1bp; Mon, 17 Jun 2024 16:30:57 +0000 (UTC) Received: from ilclasset02 (ilclasset02.mot.com [100.64.49.13]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: mbland) by va32lmmrp01.lenovo.com (Postfix) with ESMTPSA id 4W2wNw5jG8z2VZRt; Mon, 17 Jun 2024 16:30:56 +0000 (UTC) Date: Mon, 17 Jun 2024 11:30:55 -0500 From: Maxwell Bland To: "open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)" Cc: Catalin Marinas , Will Deacon , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Zi Shen Lim , Mark Rutland , Suzuki K Poulose , Mark Brown , linux-arm-kernel@lists.infradead.org, open list , Josh Poimboeuf , Puranjay Mohan Subject: [PATCH bpf-next v7 1/2] cfi: add C CFI type macro Message-ID: References: Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Proofpoint-GUID: 73KwCL7ZNu4ZqCLmvWaI1aZrjZcEqfiN X-Proofpoint-ORIG-GUID: 73KwCL7ZNu4ZqCLmvWaI1aZrjZcEqfiN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-17_14,2024-06-17_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 adultscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 lowpriorityscore=0 spamscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406170128 X-Patchwork-Delegate: bpf@iogearbox.net From: Mark Rutland Currently x86 and riscv open-code 4 instances of the same logic to define a u32 variable with the KCFI typeid of a given function. Replace the duplicate logic with a common macro. Signed-off-by: Mark Rutland Signed-off-by: Maxwell Bland --- arch/riscv/kernel/cfi.c | 35 +++-------------------------------- arch/x86/kernel/alternative.c | 35 +++-------------------------------- include/linux/cfi_types.h | 23 +++++++++++++++++++++++ 3 files changed, 29 insertions(+), 64 deletions(-) diff --git a/arch/riscv/kernel/cfi.c b/arch/riscv/kernel/cfi.c index 64bdd3e1ab8c..e7aec5f36dd5 100644 --- a/arch/riscv/kernel/cfi.c +++ b/arch/riscv/kernel/cfi.c @@ -4,6 +4,7 @@ * * Copyright (C) 2023 Google LLC */ +#include #include #include @@ -82,41 +83,11 @@ struct bpf_insn; /* Must match bpf_func_t / DEFINE_BPF_PROG_RUN() */ extern unsigned int __bpf_prog_runX(const void *ctx, const struct bpf_insn *insn); - -/* - * Force a reference to the external symbol so the compiler generates - * __kcfi_typid. - */ -__ADDRESSABLE(__bpf_prog_runX); - -/* u32 __ro_after_init cfi_bpf_hash = __kcfi_typeid___bpf_prog_runX; */ -asm ( -" .pushsection .data..ro_after_init,\"aw\",@progbits \n" -" .type cfi_bpf_hash,@object \n" -" .globl cfi_bpf_hash \n" -" .p2align 2, 0x0 \n" -"cfi_bpf_hash: \n" -" .word __kcfi_typeid___bpf_prog_runX \n" -" .size cfi_bpf_hash, 4 \n" -" .popsection \n" -); +DEFINE_CFI_TYPE(cfi_bpf_hash, __bpf_prog_runX); /* Must match bpf_callback_t */ extern u64 __bpf_callback_fn(u64, u64, u64, u64, u64); - -__ADDRESSABLE(__bpf_callback_fn); - -/* u32 __ro_after_init cfi_bpf_subprog_hash = __kcfi_typeid___bpf_callback_fn; */ -asm ( -" .pushsection .data..ro_after_init,\"aw\",@progbits \n" -" .type cfi_bpf_subprog_hash,@object \n" -" .globl cfi_bpf_subprog_hash \n" -" .p2align 2, 0x0 \n" -"cfi_bpf_subprog_hash: \n" -" .word __kcfi_typeid___bpf_callback_fn \n" -" .size cfi_bpf_subprog_hash, 4 \n" -" .popsection \n" -); +DEFINE_CFI_TYPE(cfi_bpf_subprog_hash, __bpf_callback_fn); u32 cfi_get_func_hash(void *func) { diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 89de61243272..933d0c13a0d8 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0-only #define pr_fmt(fmt) "SMP alternatives: " fmt +#include #include #include #include @@ -901,41 +902,11 @@ struct bpf_insn; /* Must match bpf_func_t / DEFINE_BPF_PROG_RUN() */ extern unsigned int __bpf_prog_runX(const void *ctx, const struct bpf_insn *insn); - -/* - * Force a reference to the external symbol so the compiler generates - * __kcfi_typid. - */ -__ADDRESSABLE(__bpf_prog_runX); - -/* u32 __ro_after_init cfi_bpf_hash = __kcfi_typeid___bpf_prog_runX; */ -asm ( -" .pushsection .data..ro_after_init,\"aw\",@progbits \n" -" .type cfi_bpf_hash,@object \n" -" .globl cfi_bpf_hash \n" -" .p2align 2, 0x0 \n" -"cfi_bpf_hash: \n" -" .long __kcfi_typeid___bpf_prog_runX \n" -" .size cfi_bpf_hash, 4 \n" -" .popsection \n" -); +DEFINE_CFI_TYPE(cfi_bpf_hash, __bpf_prog_runX); /* Must match bpf_callback_t */ extern u64 __bpf_callback_fn(u64, u64, u64, u64, u64); - -__ADDRESSABLE(__bpf_callback_fn); - -/* u32 __ro_after_init cfi_bpf_subprog_hash = __kcfi_typeid___bpf_callback_fn; */ -asm ( -" .pushsection .data..ro_after_init,\"aw\",@progbits \n" -" .type cfi_bpf_subprog_hash,@object \n" -" .globl cfi_bpf_subprog_hash \n" -" .p2align 2, 0x0 \n" -"cfi_bpf_subprog_hash: \n" -" .long __kcfi_typeid___bpf_callback_fn \n" -" .size cfi_bpf_subprog_hash, 4 \n" -" .popsection \n" -); +DEFINE_CFI_TYPE(cfi_bpf_subprog_hash, __bpf_callback_fn); u32 cfi_get_func_hash(void *func) { diff --git a/include/linux/cfi_types.h b/include/linux/cfi_types.h index 6b8713675765..f510e62ca8b1 100644 --- a/include/linux/cfi_types.h +++ b/include/linux/cfi_types.h @@ -41,5 +41,28 @@ SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) #endif +#else /* __ASSEMBLY__ */ + +#ifdef CONFIG_CFI_CLANG +#define DEFINE_CFI_TYPE(name, func) \ + /* \ + * Force a reference to the function so the compiler generates \ + * __kcfi_typeid_. \ + */ \ + __ADDRESSABLE(func); \ + /* u32 name = __kcfi_typeid_ */ \ + extern u32 name; \ + asm ( \ + " .pushsection .data..ro_after_init,\"aw\",@progbits \n" \ + " .type " #name ",@object \n" \ + " .globl " #name " \n" \ + " .p2align 2, 0x0 \n" \ + #name ": \n" \ + " .long __kcfi_typeid_" #func " \n" \ + " .size " #name ", 4 \n" \ + " .popsection \n" \ + ); +#endif + #endif /* __ASSEMBLY__ */ #endif /* _LINUX_CFI_TYPES_H */