From patchwork Wed Jun 12 15:30:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxwell Bland X-Patchwork-Id: 13695199 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5B9AEC27C53 for ; Wed, 12 Jun 2024 15:31:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=8WJALL82Sk9HW31XdlI5/qJF14ASSC7G53mFaIDlTHE=; b=o1GD9dvCBetxYgBWfXShtn3iwz M5tASCs/sashM6CSZYkVy46WfWjWBsAqTjjDQCTN1RJ1pbGnCwBpLZwWhbtfmNN/gAkciTqYohHbb H8mxn9nuJ439vx2P8GyOFtow01PRiuFAMAzOjM8J0wbiM94TwgcJJ7kadAWglZWEQywMTCgNyJdxC KPbd1eXuXa5xlB7KwO0QvKngEX3rftg7wcpd9EtlcZB5lFawxo+adUdvxAtUkiO82e4lwFvll5qU5 fdp9lFfMxuVoO8RFmTtl1tPIVoyXlPmhDlnsmiobO4InmIwoauebWHT6ehYi9ocSOSkmrzcgB6jIj ho3NOHzQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHPvz-0000000DAxZ-2u3D; Wed, 12 Jun 2024 15:30:47 +0000 Received: from mx0b-00823401.pphosted.com ([148.163.152.46]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHPvv-0000000DAwM-3zW9 for linux-arm-kernel@lists.infradead.org; Wed, 12 Jun 2024 15:30:46 +0000 Received: from pps.filterd (m0355092.ppops.net [127.0.0.1]) by mx0b-00823401.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45CCP1ED025711; Wed, 12 Jun 2024 15:30:08 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=u+K8j4Zl0SL5R8jo7tx1yB96WVYiDjz3XIHWfj3 jgzaoZjTVDGWEuOcXRIn4az7tt5yUowZK5vqHhb+RLyTlkTvN2MXO3sza5Xk9RLU QXq9+ZI8EbevxNapOgfwB+BcWL4Vij8sOh8DgrGx8CLNUB80KZ1qaZXb95hhJrEL I0FtV5FwJnr+wsMj7f/CgtBcQzTf1YTgzccP3sKoBcvYNNOS3R5mt69ww4H3xKJY WdsaNxHr/+2QMWDTGobddDW1bKCcl5wMNq/MJWHlRlmzJRg8TuzphID8tRTSgZwp WoqugM4TfrnWSgvoQW0hOgiE6Bpa2ouiVPIpS9FHDmIEeGw== Received: from va32lpfpp04.lenovo.com ([104.232.228.24]) by mx0b-00823401.pphosted.com (PPS) with ESMTPS id 3yn5mcqfpp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Jun 2024 15:30:08 +0000 (GMT) Received: from ilclmmrp01.lenovo.com (ilclmmrp01.mot.com [100.65.83.165]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by va32lpfpp04.lenovo.com (Postfix) with ESMTPS id 4VzqH4149Fzg1bn; Wed, 12 Jun 2024 15:30:08 +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 ilclmmrp01.lenovo.com (Postfix) with ESMTPSA id 4VzqH36rykz3nd88; Wed, 12 Jun 2024 15:30:07 +0000 (UTC) Date: Wed, 12 Jun 2024 10:30:06 -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 v6 1/3] cfi: add C CFI type macro Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Proofpoint-GUID: BKW5k9w-_tNY6AftGe2uCC95v5P6L0jn X-Proofpoint-ORIG-GUID: BKW5k9w-_tNY6AftGe2uCC95v5P6L0jn 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=2024-06-12_08,2024-06-12_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 clxscore=1015 malwarescore=0 mlxlogscore=999 mlxscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 adultscore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406120111 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240612_083044_165161_3350843A X-CRM114-Status: GOOD ( 16.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 */ From patchwork Wed Jun 12 15:31:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxwell Bland X-Patchwork-Id: 13695217 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 468E8C27C53 for ; Wed, 12 Jun 2024 15:31:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=a4s3FH+hpDH3hFod22EhY5FwnbYexAKiSzqQqvZdLNE=; b=B9f7tpgQJOgqk33yFU88nJuUXb FoYMVyt0OV36gLGCyGyq9IIRUQ9mopfG5Un9gRwslRVwPAqNWoWElJGEOI9VpS+ec+0b2jedJpLGv y35hYB/t9UI5BHTXRPGaWPYXAiC6w9GaZU0VDM4NusTmLAhqUNrQph+3h2fIxM8nkBrP4tQBOoMRg huSvW/Zn+XtQ+hGECUQX2X/kans+wQjJMCdjhhf+p3zyHGif2L6pCg/imNq1t6TCqxB3fzljQd0YH ScWjNoMvO8H0szoH3T6XWoAUb6wYsAfTElXb74Wt374JKYlLhWJeE/nqEH6jtjQkFkIkjr51JwVUZ 8tARISMg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHPwt-0000000DBCW-2eip; Wed, 12 Jun 2024 15:31:43 +0000 Received: from mx0a-00823401.pphosted.com ([148.163.148.104]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHPwq-0000000DBBX-1vbo for linux-arm-kernel@lists.infradead.org; Wed, 12 Jun 2024 15:31:41 +0000 Received: from pps.filterd (m0355086.ppops.net [127.0.0.1]) by mx0a-00823401.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45CD9GJx021569; Wed, 12 Jun 2024 15:31:15 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=a4s3FH+hpDH3hFod22EhY5F wnbYexAKiSzqQqvZdLNE=; b=kgM3DdXCzxqrl73mAuKtr2a1MK9gSMBxLKO0n6P 8AylSndFpVHRn8IfMr+xcvlh/E9d2zLidwG8gZCpQpQPeN1WXVXo/GVLf0tdFm4V rNPnlv25+j2D9SCs5J31qXgBrysBlWwya/uB1InmA7mItQ4MF9Ilr/XfKhSIAyNV kBBwlaRTGykFdW4zVBhlsjwYkKSLdpXAutJAQRvq+Jp7aSAdRd9+co2u532ruZPo 8KvpCNFSWPbsraTO35tHsp5keSBz7ArjE2aMkyvKHD4Tv5wxruOtewnY5vCzy2KT 4FC9N1w1KAMJJxqzwiRQklyNP/7NpGPtfiniEgQ0kQE1Thw== Received: from va32lpfpp01.lenovo.com ([104.232.228.21]) by mx0a-00823401.pphosted.com (PPS) with ESMTPS id 3yn52m7kut-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Jun 2024 15:31:14 +0000 (GMT) Received: from ilclmmrp02.lenovo.com (ilclmmrp02.mot.com [100.65.83.26]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by va32lpfpp01.lenovo.com (Postfix) with ESMTPS id 4VzqJK6Z9tzhWB7; Wed, 12 Jun 2024 15:31:13 +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 ilclmmrp02.lenovo.com (Postfix) with ESMTPSA id 4VzqJK4lQBz3p6jp; Wed, 12 Jun 2024 15:31:13 +0000 (UTC) Date: Wed, 12 Jun 2024 10:31:12 -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 v6 2/3] arm64/cfi,bpf: Support kCFI + BPF on arm64 Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Proofpoint-GUID: ba44IPis5dS1I3eljDJ0KPPH5WEXiNbI X-Proofpoint-ORIG-GUID: ba44IPis5dS1I3eljDJ0KPPH5WEXiNbI 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=2024-06-12_08,2024-06-12_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 adultscore=0 lowpriorityscore=0 spamscore=0 suspectscore=0 priorityscore=1501 mlxlogscore=999 impostorscore=0 bulkscore=0 malwarescore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406120111 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240612_083140_542414_E4FDA49F X-CRM114-Status: GOOD ( 25.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Puranjay Mohan Currently, bpf_dispatcher_*_func() is marked with `__nocfi` therefore calling BPF programs from this interface doesn't cause CFI warnings. When BPF programs are called directly from C: from BPF helpers or struct_ops, CFI warnings are generated. Implement proper CFI prologues for the BPF programs and callbacks and drop __nocfi for arm64. Fix the trampoline generation code to emit kCFI prologue when a struct_ops trampoline is being prepared. Signed-off-by: Puranjay Mohan Signed-off-by: Maxwell Bland --- arch/arm64/include/asm/cfi.h | 23 ++++++++++++++ arch/arm64/kernel/alternative.c | 54 +++++++++++++++++++++++++++++++++ arch/arm64/net/bpf_jit_comp.c | 21 +++++++++++-- 3 files changed, 95 insertions(+), 3 deletions(-) create mode 100644 arch/arm64/include/asm/cfi.h diff --git a/arch/arm64/include/asm/cfi.h b/arch/arm64/include/asm/cfi.h new file mode 100644 index 000000000000..670e191f8628 --- /dev/null +++ b/arch/arm64/include/asm/cfi.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_ARM64_CFI_H +#define _ASM_ARM64_CFI_H + +#ifdef CONFIG_CFI_CLANG +#define __bpfcall +static inline int cfi_get_offset(void) +{ + return 4; +} +#define cfi_get_offset cfi_get_offset +extern u32 cfi_bpf_hash; +extern u32 cfi_bpf_subprog_hash; +extern u32 cfi_get_func_hash(void *func); +#else +#define cfi_bpf_hash 0U +#define cfi_bpf_subprog_hash 0U +static inline u32 cfi_get_func_hash(void *func) +{ + return 0; +} +#endif /* CONFIG_CFI_CLANG */ +#endif /* _ASM_ARM64_CFI_H */ diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c index 8ff6610af496..1715da7df137 100644 --- a/arch/arm64/kernel/alternative.c +++ b/arch/arm64/kernel/alternative.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -298,3 +299,56 @@ noinstr void alt_cb_patch_nops(struct alt_instr *alt, __le32 *origptr, updptr[i] = cpu_to_le32(aarch64_insn_gen_nop()); } EXPORT_SYMBOL(alt_cb_patch_nops); + +#ifdef CONFIG_CFI_CLANG +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" +); + +/* 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" +); + +u32 cfi_get_func_hash(void *func) +{ + u32 hash; + + if (get_kernel_nofault(hash, func - cfi_get_offset())) + return 0; + + return hash; +} +#endif diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 720336d28856..211e1c29f004 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -162,6 +163,12 @@ static inline void emit_bti(u32 insn, struct jit_ctx *ctx) emit(insn, ctx); } +static inline void emit_kcfi(u32 hash, struct jit_ctx *ctx) +{ + if (IS_ENABLED(CONFIG_CFI_CLANG)) + emit(hash, ctx); +} + /* * Kernel addresses in the vmalloc space use at most 48 bits, and the * remaining bits are guaranteed to be 0x1. So we can compose the address @@ -311,7 +318,6 @@ static int build_prologue(struct jit_ctx *ctx, bool ebpf_from_cbpf, const u8 tcc = bpf2a64[TCALL_CNT]; const u8 fpb = bpf2a64[FP_BOTTOM]; const u8 arena_vm_base = bpf2a64[ARENA_VM_START]; - const int idx0 = ctx->idx; int cur_offset; /* @@ -337,6 +343,9 @@ static int build_prologue(struct jit_ctx *ctx, bool ebpf_from_cbpf, * */ + emit_kcfi(is_main_prog ? cfi_bpf_hash : cfi_bpf_subprog_hash, ctx); + const int idx0 = ctx->idx; + /* bpf function may be invoked by 3 instruction types: * 1. bl, attached via freplace to bpf prog via short jump * 2. br, attached via freplace to bpf prog via long jump @@ -1849,9 +1858,9 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) jit_data->ro_header = ro_header; } - prog->bpf_func = (void *)ctx.ro_image; + prog->bpf_func = (void *)ctx.ro_image + cfi_get_offset(); prog->jited = 1; - prog->jited_len = prog_size; + prog->jited_len = prog_size - cfi_get_offset(); if (!prog->is_func || extra_pass) { int i; @@ -2104,6 +2113,12 @@ static int prepare_trampoline(struct jit_ctx *ctx, struct bpf_tramp_image *im, /* return address locates above FP */ retaddr_off = stack_size + 8; + if (flags & BPF_TRAMP_F_INDIRECT) { + /* + * Indirect call for bpf_struct_ops + */ + emit_kcfi(cfi_get_func_hash(func_addr), ctx); + } /* bpf trampoline may be invoked by 3 instruction types: * 1. bl, attached to bpf prog or kernel function via short jump * 2. br, attached to bpf prog or kernel function via long jump From patchwork Wed Jun 12 15:32:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxwell Bland X-Patchwork-Id: 13695218 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8C661C27C53 for ; Wed, 12 Jun 2024 15:33:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5UYz7vM8ukqZ7+rx3Rz0bIjlD/l1jReNBhEadDHRJ70=; b=IV+ZdmFyqSf+NrdYeIupcAAdH4 jHIir6k5c4NITr/aDix0fM16FzKwsveAqxqcgfHKLexlUczM9OBNR9CWPueGXFLiFusS9GobH1abM RpE7wW+83iVUF/BHlB73NvykY9P6xPMFPWpy93EibRqcYN/WXx65W3a2/sfGmyZfoF2I/lEw6Wsc5 dmeO+cScu8sUwC96ud1G2ePK16ng7havHtRqv8gkUUkZPmKklZHuQwwPVmkdkkbiiXiN6/B5PrPif Leg+dytpDQowLHvex5rljZtviGI44jcjd4OB3BVe+UnRwA0de9wnYE5QtS4gj5khcK6ixsRhSAq5T PiCoagIA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHPy1-0000000DBcB-18SM; Wed, 12 Jun 2024 15:32:53 +0000 Received: from mx0b-00823401.pphosted.com ([148.163.152.46]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sHPxy-0000000DBaT-3KPi for linux-arm-kernel@lists.infradead.org; Wed, 12 Jun 2024 15:32:52 +0000 Received: from pps.filterd (m0355090.ppops.net [127.0.0.1]) by m0355090.ppops.net (8.18.1.2/8.18.1.2) with ESMTP id 45CDleNs004491; Wed, 12 Jun 2024 15:32:19 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=5UYz7vM8ukqZ7+rx3Rz0bIj lD/l1jReNBhEadDHRJ70=; b=rBqrXBe6qrlvYkIRocJmwI/w/30JQDW1d5FBlxC va2Yr8DYzIwLJHWai3Oc23+Z38N+nLb1A6NmAyyo0KiBVdSsjoqDkUAtN+v094ZZ 7YvxCfQJE/q2bSheubx/z+/uE25pTJfzug+bZtiiF0TtvJJ9LWrAGXb964dNls8g DTt9jV/8l+9NqvXRvu4Gy3CkY69yhk1tnquk+L4KbYZbTxzH1mGohMRdkl3uohBq 2/QVrzM9vwqtVEIrJ+oa5GjHSV0Zq1/CGZaB3jgo61B80EcHbD0rdHkSAdHATqFi cTMJJfnWz4jqBAtHyO7lUswFAEYC5MgvVTGGS/jT0jOpsUg== Received: from va32lpfpp03.lenovo.com ([104.232.228.23]) by m0355090.ppops.net (PPS) with ESMTPS id 3yn2msg6vg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Jun 2024 15:32:19 +0000 (GMT) Received: from va32lmmrp02.lenovo.com (va32lmmrp02.mot.com [10.62.176.191]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by va32lpfpp03.lenovo.com (Postfix) with ESMTPS id 4VzqKZ6ymTz51Q9y; Wed, 12 Jun 2024 15:32:18 +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 va32lmmrp02.lenovo.com (Postfix) with ESMTPSA id 4VzqKZ3HsBz2VZ3B; Wed, 12 Jun 2024 15:32:18 +0000 (UTC) Date: Wed, 12 Jun 2024 10:32:17 -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 v6 3/3] arm64/cfi,bpf: Use DEFINE_CFI_TYPE in arm64 Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Proofpoint-ORIG-GUID: 4_v9B3kXPAzqWmjgo_DoyOlN5e58hRxg X-Proofpoint-GUID: 4_v9B3kXPAzqWmjgo_DoyOlN5e58hRxg 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=2024-06-12_08,2024-06-12_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 bulkscore=0 malwarescore=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 phishscore=0 adultscore=0 mlxscore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406120111 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240612_083250_967784_F61AB475 X-CRM114-Status: GOOD ( 14.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Corrects Puranjay Mohan's commit to adopt Mark Rutland's suggestion of using a C CFI type macro in kCFI+BPF. Signed-off-by: Maxwell Bland --- arch/arm64/kernel/alternative.c | 46 ++++----------------------------- 1 file changed, 5 insertions(+), 41 deletions(-) diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c index 1715da7df137..d7a58eca7665 100644 --- a/arch/arm64/kernel/alternative.c +++ b/arch/arm64/kernel/alternative.c @@ -8,6 +8,7 @@ #define pr_fmt(fmt) "alternatives: " fmt +#include #include #include #include @@ -302,53 +303,16 @@ EXPORT_SYMBOL(alt_cb_patch_nops); #ifdef CONFIG_CFI_CLANG 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) { - u32 hash; - - if (get_kernel_nofault(hash, func - cfi_get_offset())) - return 0; - - return hash; + u32 *hashp = func - cfi_get_offset(); + return READ_ONCE(*hashp); } #endif