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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org After KASAN_VMALLOC works in arm64, we can randomize module region into vmalloc area now. Test: VMALLOC area ffffffc010000000 fffffffdf0000000 before the patch: module_alloc_base/end ffffffc008b80000 ffffffc010000000 after the patch: module_alloc_base/end ffffffdcf4bed000 ffffffc010000000 And the function that insmod some modules is fine. Suggested-by: Ard Biesheuvel Signed-off-by: Lecopzer Chen --- arch/arm64/kernel/kaslr.c | 18 ++++++++++-------- arch/arm64/kernel/module.c | 16 +++++++++------- 2 files changed, 19 insertions(+), 15 deletions(-) diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c index 1c74c45b9494..a2858058e724 100644 --- a/arch/arm64/kernel/kaslr.c +++ b/arch/arm64/kernel/kaslr.c @@ -161,15 +161,17 @@ u64 __init kaslr_early_init(u64 dt_phys) /* use the top 16 bits to randomize the linear region */ memstart_offset_seed = seed >> 48; - if (IS_ENABLED(CONFIG_KASAN_GENERIC) || - IS_ENABLED(CONFIG_KASAN_SW_TAGS)) + if (!IS_ENABLED(CONFIG_KASAN_VMALLOC) && + (IS_ENABLED(CONFIG_KASAN_GENERIC) || + IS_ENABLED(CONFIG_KASAN_SW_TAGS))) /* - * KASAN does not expect the module region to intersect the - * vmalloc region, since shadow memory is allocated for each - * module at load time, whereas the vmalloc region is shadowed - * by KASAN zero pages. So keep modules out of the vmalloc - * region if KASAN is enabled, and put the kernel well within - * 4 GB of the module region. + * KASAN without KASAN_VMALLOC does not expect the module region + * to intersect the vmalloc region, since shadow memory is + * allocated for each module at load time, whereas the vmalloc + * region is shadowed by KASAN zero pages. So keep modules + * out of the vmalloc region if KASAN is enabled without + * KASAN_VMALLOC, and put the kernel well within 4 GB of the + * module region. */ return offset % SZ_2G; diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c index fe21e0f06492..b5ec010c481f 100644 --- a/arch/arm64/kernel/module.c +++ b/arch/arm64/kernel/module.c @@ -40,14 +40,16 @@ void *module_alloc(unsigned long size) NUMA_NO_NODE, __builtin_return_address(0)); if (!p && IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) && - !IS_ENABLED(CONFIG_KASAN_GENERIC) && - !IS_ENABLED(CONFIG_KASAN_SW_TAGS)) + (IS_ENABLED(CONFIG_KASAN_VMALLOC) || + (!IS_ENABLED(CONFIG_KASAN_GENERIC) && + !IS_ENABLED(CONFIG_KASAN_SW_TAGS)))) /* - * KASAN can only deal with module allocations being served - * from the reserved module region, since the remainder of - * the vmalloc region is already backed by zero shadow pages, - * and punching holes into it is non-trivial. Since the module - * region is not randomized when KASAN is enabled, it is even + * KASAN without KASAN_VMALLOC can only deal with module + * allocations being served from the reserved module region, + * since the remainder of the vmalloc region is already + * backed by zero shadow pages, and punching holes into it + * is non-trivial. Since the module region is not randomized + * when KASAN is enabled without KASAN_VMALLOC, it is even * less likely that the module region gets exhausted, so we * can simply omit this fallback in that case. */ -- 2.25.1 _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49681C433E9 for ; Sat, 6 Feb 2021 08:48:25 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 05AA164F06 for ; 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Sat, 06 Feb 2021 00:46:21 -0800 Received: from mtkmbs08n2.mediatek.inc (172.21.101.56) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sat, 6 Feb 2021 00:36:19 -0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs08n2.mediatek.inc (172.21.101.56) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sat, 6 Feb 2021 16:36:07 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Sat, 6 Feb 2021 16:36:08 +0800 From: Lecopzer Chen To: , , , , Subject: [PATCH v3 4/5] arm64: kaslr: support randomized module area with KASAN_VMALLOC Date: Sat, 6 Feb 2021 16:35:51 +0800 Message-ID: <20210206083552.24394-5-lecopzer.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20210206083552.24394-1-lecopzer.chen@mediatek.com> References: <20210206083552.24394-1-lecopzer.chen@mediatek.com> MIME-Version: 1.0 X-TM-SNTS-SMTP: DEC81A8B4BED333FFD3CB4BEEA964F8E7288657F38F621992E8AA30C4139E42E2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210206_034635_776330_0B438D79 X-CRM114-Status: GOOD ( 14.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tyhicks@linux.microsoft.com, Lecopzer Chen , glider@google.com, yj.chiang@mediatek.com, gustavoars@kernel.org, andreyknvl@google.com, ardb@kernel.org, lecopzer@gmail.com, broonie@kernel.org, linux-mediatek@lists.infradead.org, linux@roeck-us.net, rppt@kernel.org, catalin.marinas@arm.com, aryabinin@virtuozzo.com, dan.j.williams@intel.com, vincenzo.frascino@arm.com, robin.murphy@arm.com, akpm@linux-foundation.org, dvyukov@google.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org After KASAN_VMALLOC works in arm64, we can randomize module region into vmalloc area now. Test: VMALLOC area ffffffc010000000 fffffffdf0000000 before the patch: module_alloc_base/end ffffffc008b80000 ffffffc010000000 after the patch: module_alloc_base/end ffffffdcf4bed000 ffffffc010000000 And the function that insmod some modules is fine. Suggested-by: Ard Biesheuvel Signed-off-by: Lecopzer Chen --- arch/arm64/kernel/kaslr.c | 18 ++++++++++-------- arch/arm64/kernel/module.c | 16 +++++++++------- 2 files changed, 19 insertions(+), 15 deletions(-) diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c index 1c74c45b9494..a2858058e724 100644 --- a/arch/arm64/kernel/kaslr.c +++ b/arch/arm64/kernel/kaslr.c @@ -161,15 +161,17 @@ u64 __init kaslr_early_init(u64 dt_phys) /* use the top 16 bits to randomize the linear region */ memstart_offset_seed = seed >> 48; - if (IS_ENABLED(CONFIG_KASAN_GENERIC) || - IS_ENABLED(CONFIG_KASAN_SW_TAGS)) + if (!IS_ENABLED(CONFIG_KASAN_VMALLOC) && + (IS_ENABLED(CONFIG_KASAN_GENERIC) || + IS_ENABLED(CONFIG_KASAN_SW_TAGS))) /* - * KASAN does not expect the module region to intersect the - * vmalloc region, since shadow memory is allocated for each - * module at load time, whereas the vmalloc region is shadowed - * by KASAN zero pages. So keep modules out of the vmalloc - * region if KASAN is enabled, and put the kernel well within - * 4 GB of the module region. + * KASAN without KASAN_VMALLOC does not expect the module region + * to intersect the vmalloc region, since shadow memory is + * allocated for each module at load time, whereas the vmalloc + * region is shadowed by KASAN zero pages. So keep modules + * out of the vmalloc region if KASAN is enabled without + * KASAN_VMALLOC, and put the kernel well within 4 GB of the + * module region. */ return offset % SZ_2G; diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c index fe21e0f06492..b5ec010c481f 100644 --- a/arch/arm64/kernel/module.c +++ b/arch/arm64/kernel/module.c @@ -40,14 +40,16 @@ void *module_alloc(unsigned long size) NUMA_NO_NODE, __builtin_return_address(0)); if (!p && IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) && - !IS_ENABLED(CONFIG_KASAN_GENERIC) && - !IS_ENABLED(CONFIG_KASAN_SW_TAGS)) + (IS_ENABLED(CONFIG_KASAN_VMALLOC) || + (!IS_ENABLED(CONFIG_KASAN_GENERIC) && + !IS_ENABLED(CONFIG_KASAN_SW_TAGS)))) /* - * KASAN can only deal with module allocations being served - * from the reserved module region, since the remainder of - * the vmalloc region is already backed by zero shadow pages, - * and punching holes into it is non-trivial. Since the module - * region is not randomized when KASAN is enabled, it is even + * KASAN without KASAN_VMALLOC can only deal with module + * allocations being served from the reserved module region, + * since the remainder of the vmalloc region is already + * backed by zero shadow pages, and punching holes into it + * is non-trivial. Since the module region is not randomized + * when KASAN is enabled without KASAN_VMALLOC, it is even * less likely that the module region gets exhausted, so we * can simply omit this fallback in that case. */ -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MIME_BASE64_TEXT,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 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+0800 From: Lecopzer Chen To: , , , , CC: , , , , , , , , , , , , , , , , , , Lecopzer Chen Subject: [PATCH v3 4/5] arm64: kaslr: support randomized module area with KASAN_VMALLOC Date: Sat, 6 Feb 2021 16:35:51 +0800 Message-ID: <20210206083552.24394-5-lecopzer.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20210206083552.24394-1-lecopzer.chen@mediatek.com> References: <20210206083552.24394-1-lecopzer.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-SNTS-SMTP: DEC81A8B4BED333FFD3CB4BEEA964F8E7288657F38F621992E8AA30C4139E42E2000:8 X-MTK: N Content-Transfer-Encoding: base64 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: QWZ0ZXIgS0FTQU5fVk1BTExPQyB3b3JrcyBpbiBhcm02NCwgd2UgY2FuIHJhbmRvbWl6ZSBtb2R1 bGUgcmVnaW9uDQppbnRvIHZtYWxsb2MgYXJlYSBub3cuDQoNClRlc3Q6DQoJVk1BTExPQyBhcmVh 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