From patchwork Fri Jan 21 19:49:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 12720182 X-Patchwork-Delegate: bpf@iogearbox.net 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 92164C433F5 for ; Fri, 21 Jan 2022 19:49:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232702AbiAUTtq convert rfc822-to-8bit (ORCPT ); Fri, 21 Jan 2022 14:49:46 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:52286 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232107AbiAUTtm (ORCPT ); Fri, 21 Jan 2022 14:49:42 -0500 Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 20LG5fSR016392 for ; Fri, 21 Jan 2022 11:49:42 -0800 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3dqj0gnjta-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 21 Jan 2022 11:49:42 -0800 Received: from twshared3115.02.ash8.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Fri, 21 Jan 2022 11:49:40 -0800 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 9C82C284A5F1B; Fri, 21 Jan 2022 11:49:35 -0800 (PST) From: Song Liu To: , , CC: , , , , , , Song Liu Subject: [PATCH v6 bpf-next 3/7] bpf: use size instead of pages in bpf_binary_header Date: Fri, 21 Jan 2022 11:49:22 -0800 Message-ID: <20220121194926.1970172-4-song@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220121194926.1970172-1-song@kernel.org> References: <20220121194926.1970172-1-song@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: kqw5RgMF85d4NASs86t4IkYJw5pLTzG7 X-Proofpoint-ORIG-GUID: kqw5RgMF85d4NASs86t4IkYJw5pLTzG7 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-21_09,2022-01-21_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=fb_outbound_notspam policy=fb_outbound score=0 mlxlogscore=870 adultscore=0 suspectscore=0 phishscore=0 mlxscore=0 bulkscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 clxscore=1015 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2201210128 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: Song Liu This is necessary to charge sub page memory for the BPF program. Signed-off-by: Song Liu --- include/linux/filter.h | 6 +++--- kernel/bpf/core.c | 11 +++++------ 2 files changed, 8 insertions(+), 9 deletions(-) diff --git a/include/linux/filter.h b/include/linux/filter.h index d23e999dc032..5855eb474c62 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -548,7 +548,7 @@ struct sock_fprog_kern { #define BPF_IMAGE_ALIGNMENT 8 struct bpf_binary_header { - u32 pages; + u32 size; u8 image[] __aligned(BPF_IMAGE_ALIGNMENT); }; @@ -886,8 +886,8 @@ static inline void bpf_prog_lock_ro(struct bpf_prog *fp) static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr) { set_vm_flush_reset_perms(hdr); - set_memory_ro((unsigned long)hdr, hdr->pages); - set_memory_x((unsigned long)hdr, hdr->pages); + set_memory_ro((unsigned long)hdr, hdr->size >> PAGE_SHIFT); + set_memory_x((unsigned long)hdr, hdr->size >> PAGE_SHIFT); } static inline struct bpf_binary_header * diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index b9c6a426a7dd..f252d8529b0b 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -543,7 +543,7 @@ bpf_prog_ksym_set_addr(struct bpf_prog *prog) WARN_ON_ONCE(!bpf_prog_ebpf_jited(prog)); prog->aux->ksym.start = (unsigned long) prog->bpf_func; - prog->aux->ksym.end = addr + hdr->pages * PAGE_SIZE; + prog->aux->ksym.end = addr + hdr->size; } static void @@ -866,7 +866,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, bpf_jit_fill_hole_t bpf_fill_ill_insns) { struct bpf_binary_header *hdr; - u32 size, hole, start, pages; + u32 size, hole, start; WARN_ON_ONCE(!is_power_of_2(alignment) || alignment > BPF_IMAGE_ALIGNMENT); @@ -876,7 +876,6 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, * random section of illegal instructions. */ size = round_up(proglen + sizeof(*hdr) + 128, PAGE_SIZE); - pages = size / PAGE_SIZE; if (bpf_jit_charge_modmem(size)) return NULL; @@ -889,7 +888,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, /* Fill space with illegal/arch-dep instructions. */ bpf_fill_ill_insns(hdr, size); - hdr->pages = pages; + hdr->size = size; hole = min_t(unsigned int, size - (proglen + sizeof(*hdr)), PAGE_SIZE - sizeof(*hdr)); start = (get_random_int() % hole) & ~(alignment - 1); @@ -902,10 +901,10 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, void bpf_jit_binary_free(struct bpf_binary_header *hdr) { - u32 pages = hdr->pages; + u32 size = hdr->size; bpf_jit_free_exec(hdr); - bpf_jit_uncharge_modmem(pages << PAGE_SHIFT); + bpf_jit_uncharge_modmem(size); } /* This symbol is only overridden by archs that have different