From patchwork Mon Jun 10 18:06:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxwell Bland X-Patchwork-Id: 13692336 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mx0a-00823401.pphosted.com (mx0a-00823401.pphosted.com [148.163.148.104]) (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 AB31B152DF1; Mon, 10 Jun 2024 18:07:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.148.104 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718042825; cv=none; b=SxyXlZDtjPWy8DGQValAUICI39RYx6s4K9QRUs8tddy9YBKYAeOsY1vd4nTaJSU+usUt07r3Rap5RTAz7omIudytmrNHVT/se1Jp9gWeb9u315Tp6RmjCX2c3JyYmN1ltoPGXCNGrfwv35tJNm62JVqUJecAXwlzRDsSptv20Ug= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718042825; c=relaxed/simple; bh=CqjJ/MlvtyQpfI4pujmNMijprGaOs7jhJjWcFS5BX+M=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=DBvwBV70yYXcXbxuCE5RPO6zabIcGbqdtlSBIOjd1wTCsj/L9Aix4PgaQizPfKsYiNqDYeBh//h8ngZewlPP8IJYi2ZHCgrqwN3kIlmBMzzZc39FwsNDvIFyZp+p22u1A6ECXb/xVKkb7x4Oto58KOkICYZgZxpKAecy5QHXTpA= 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=IPoPALCw; arc=none smtp.client-ip=148.163.148.104 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="IPoPALCw" Received: from pps.filterd (m0355088.ppops.net [127.0.0.1]) by m0355088.ppops.net (8.18.1.2/8.18.1.2) with ESMTP id 45ABm98B002176; Mon, 10 Jun 2024 18:06:36 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=fpGG32Pz+fVwqm7Q0mpoPSM uO7je7B3t/MuuD+KCtN8=; b=IPoPALCwWxa3+uJURcLHaUNPkasRTKkgJH5mpoV eRrzeaaNL6jKqySrszmwJ5bFfTAKq0+2JMV9H7xgY4Vv7NsN4Z6+4lKXCvLTi6l+ y8LJvwmFCceHu/gv8ohpyEeC+jWto4M62XZiJy5klBmygU9hOH7Sy6zLekQWAt/U K3QQe3Duol94Pp25rRWGOKnLcc5NKo+lcL7eQtZjSc0PpSolGW5K9RZATiP6oh+T 75ULiWMa5x9k5ay1aaiFVMDk+KtsLuvb/jHg9URq6M3N00q/g6JCzaZJ0pSITcVt ZGNzGpHLVNLpwBEFxmDIkaITpBjbGjmoiHZli0QGon3gouQ== Received: from va32lpfpp04.lenovo.com ([104.232.228.24]) by m0355088.ppops.net (PPS) with ESMTPS id 3yn4ft2at6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Jun 2024 18:06:36 +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 4VyfrW0tDvzjcK6; Mon, 10 Jun 2024 18:06:35 +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 4VyfrV68fyz3nd87; Mon, 10 Jun 2024 18:06:34 +0000 (UTC) Date: Mon, 10 Jun 2024 13:06:33 -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 v5 1/3] 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: gOTPu_mAQFXwxHHmJHPo1fLRabODHRu1 X-Proofpoint-ORIG-GUID: gOTPu_mAQFXwxHHmJHPo1fLRabODHRu1 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=2024-06-10_04,2024-06-10_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 adultscore=0 clxscore=1015 bulkscore=0 spamscore=0 priorityscore=1501 malwarescore=0 phishscore=0 suspectscore=0 mlxlogscore=999 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406100136 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 --- arch/riscv/kernel/cfi.c | 34 ++-------------------------------- arch/x86/kernel/alternative.c | 35 +++-------------------------------- include/linux/cfi_types.h | 23 +++++++++++++++++++++++ 3 files changed, 28 insertions(+), 64 deletions(-) diff --git a/arch/riscv/kernel/cfi.c b/arch/riscv/kernel/cfi.c index 64bdd3e1ab8c..b78a6f41df22 100644 --- a/arch/riscv/kernel/cfi.c +++ b/arch/riscv/kernel/cfi.c @@ -82,41 +82,11 @@ 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 Mon Jun 10 18:08:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxwell Bland X-Patchwork-Id: 13692337 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mx0a-00823401.pphosted.com (mx0a-00823401.pphosted.com [148.163.148.104]) (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 88F2914EC43; Mon, 10 Jun 2024 18:08:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.148.104 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718042914; cv=none; b=RzD7rZMnsw3l8IiV5PQ/ZDiEER+xS7VMMY3xnawKQpGK7G6BfI/diowKDyLBD0NR0YzghG2qSGWcwQCM5QNXn2vl4TWVa+x1XCGWvk1HImfVTPx5cDETKLuDSwRKoxd7ZVclxSpeqEbXjlHQn7xnCM4rPfEQNBCxrRz+jK3MHnI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718042914; c=relaxed/simple; bh=HxCncfQzHTMpPDipk6mSk/zlzD+RXv8C8N029dOqrh0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=H+gRlsZEg7C+gqsrniZlzYOLA6Z52E2bR2m+uiKNLUmoTi3Qisl8ANkKlO06DEiSg9sH0TbyG2zFZR8V2sDXpOcqf0owRn4qpGkh3ezGpbzqwFjbgW8O1nsywMqmGO70odaHAlegKqe3aAwsD6Flm0Ko8v9v/cjuoNOl310t1/k= 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=075F3kaJ; arc=none smtp.client-ip=148.163.148.104 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="075F3kaJ" Received: from pps.filterd (m0355085.ppops.net [127.0.0.1]) by mx0a-00823401.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45AAmVdp008871; Mon, 10 Jun 2024 18:08:09 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=zCXqu8mkzuFukRtuaMpwrCH i2EiAu2vEBQ8tPVD6epU=; b=075F3kaJ4WGXDQPNltaMpX1RMlQPoLpOjL+4nhb 40bsiJZxtlplLnae5J7vvuRY8H/qrQkuL40QiSCResw/sLJp5oxRuPrpDntJQqfy sObfNbXfmQE/tinjM2SVk6cPv8RYeUOG7d/2lSvMReA2o1A+8y+Ng5xSppvClJaw /U8tis4DQ3jC/tTBPORNHyFYfoJ+8G38iSEX0Oh9h7w18iWK4Mkl/K9yeO24Hfhb aOz7/Hv9eboSXiT6bG1dlvy/x4/V37CIjzjX66cG5JvynqQcsKTOwmMOkQd+h3So G420xn/DpDXvM0V/ZTno2XywNjGT7kH/6zwmMLyO4VTHbDw== Received: from ilclpfpp02.lenovo.com ([144.188.128.68]) by mx0a-00823401.pphosted.com (PPS) with ESMTPS id 3yn5tfa4md-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Jun 2024 18:08:09 +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 ilclpfpp02.lenovo.com (Postfix) with ESMTPS id 4VyftD5jj8zfBb2; Mon, 10 Jun 2024 18:08:04 +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 4VyftD0KPNz2VZRs; Mon, 10 Jun 2024 18:08:04 +0000 (UTC) Date: Mon, 10 Jun 2024 13:08:02 -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 v5 2/3] arm64/cfi,bpf: Support kCFI + BPF on arm64 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-ORIG-GUID: 5LRj_HWEogKoAQwt4nsp31fMmekyNfWw X-Proofpoint-GUID: 5LRj_HWEogKoAQwt4nsp31fMmekyNfWw 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=2024-06-10_04,2024-06-10_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 bulkscore=0 clxscore=1015 mlxlogscore=999 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406100137 X-Patchwork-Delegate: bpf@iogearbox.net 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 --- 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 Mon Jun 10 18:09:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxwell Bland X-Patchwork-Id: 13692338 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mx0a-00823401.pphosted.com (mx0a-00823401.pphosted.com [148.163.148.104]) (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 836F57E761; Mon, 10 Jun 2024 18:09:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.148.104 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718042991; cv=none; b=aLjbhZ10L+fNGt1WW3G3j+qhjW86u7T1B0Ieh5lD5UKXHMXrNv13HY7/NvL/bIPqzuLcK5ZLSu6JNGNIvgUYt6KEQAA2shk3q15jZ1+KEyHaawvq0HsMExB4JRIC1tbhvfur5V2dJc0n46QeVFcD9x5wcIBY/VbfXzTqeOI/LXU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718042991; c=relaxed/simple; bh=VMAGW0oB8N8oHwmlZO78JAp91DNuXS2+2Hv5FK2UPzw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=IGiADsqpvff5vED00ZhG3zLTwuKwAfL2pd9aGu95dVEKRHrONYk00ssCQJQ+63PTHEC+EsB/rhxnj/zmtR+9g+UkxVe2a5hNb0mAT5gMq3Ago7Hu4tUAa+67MI5iRH+PuiBvib6JFOrotCgjAVJOeYuoGcaS1eS+NjGlfhVd6ho= 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=Auuy7MG/; arc=none smtp.client-ip=148.163.148.104 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="Auuy7MG/" Received: from pps.filterd (m0355088.ppops.net [127.0.0.1]) by m0355088.ppops.net (8.18.1.2/8.18.1.2) with ESMTP id 45ABm98Q002176; Mon, 10 Jun 2024 18:09:26 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=JCButQwjvZVZNyRkDdtQ7rO g+hf/mkn6MXierihoty0=; b=Auuy7MG/eYyQO2j/HY+HwmdSM/To4BwhQSNUuYD mBj7Ez1Z1LvB5NXDoH7nIOpsIv9voZPDm0hxhmi5OU1Ym77L2nBN+jUsOCIKT3Ev GU3pRsnOxVLUWc4CBIvb9zdEmhJknXgcEY6Aep2z9bO0A+V9QahgTbTQ4VBUESfm 6FiWvZZkvRYJ2AEittN4DrrqjlrvUSnmBbiQOjBXs+62atkgtowLix9+rG/eVWel qdIOdLCRvtqxDtm5/xliA691usMjGKOFoDLSsxyXIa8LKNJTlWHJrooCPf3wVX5s wwzSR/Qp2WNC9SUJQYx27BtjMrxvWE6gCLG3sihQIKvXkHA== Received: from va32lpfpp01.lenovo.com ([104.232.228.21]) by m0355088.ppops.net (PPS) with ESMTPS id 3yn4ft2ax8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Jun 2024 18:09:26 +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 va32lpfpp01.lenovo.com (Postfix) with ESMTPS id 4Vyfvn0XBZzhWB3; Mon, 10 Jun 2024 18:09:25 +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 4Vyfvm4nzfz2VZ3B; Mon, 10 Jun 2024 18:09:24 +0000 (UTC) Date: Mon, 10 Jun 2024 13:09:23 -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 v5 3/3] arm64/cfi,bpf: Use DEFINE_CFI_TYPE in arm64 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: DUHw64W3JWg0MRvl_rezKK9v29hYaxtk X-Proofpoint-ORIG-GUID: DUHw64W3JWg0MRvl_rezKK9v29hYaxtk 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=2024-06-10_04,2024-06-10_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 adultscore=0 clxscore=1015 bulkscore=0 spamscore=0 priorityscore=1501 malwarescore=0 phishscore=0 suspectscore=0 mlxlogscore=999 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406100137 X-Patchwork-Delegate: bpf@iogearbox.net 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