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[61.230.37.4]) by smtp.gmail.com with ESMTPSA id y3sm19771657pjb.18.2021.01.03.09.12.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 Jan 2021 09:12:46 -0800 (PST) From: Lecopzer Chen To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org Cc: dan.j.williams@intel.com, aryabinin@virtuozzo.com, glider@google.com, dvyukov@google.com, akpm@linux-foundation.org, linux-mediatek@lists.infradead.org, yj.chiang@mediatek.com, will@kernel.org, catalin.marinas@arm.com, Lecopzer Chen , Lecopzer Chen Subject: [PATCH 1/3] arm64: kasan: don't populate vmalloc area for CONFIG_KASAN_VMALLOC Date: Mon, 4 Jan 2021 01:11:35 +0800 Message-Id: <20210103171137.153834-2-lecopzer@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210103171137.153834-1-lecopzer@gmail.com> References: <20210103171137.153834-1-lecopzer@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: Linux support KAsan for VMALLOC since commit 3c5c3cfb9ef4da9 ("kasan: support backing vmalloc space with real shadow memory") Like how the MODULES_VADDR does now, just not to early populate the VMALLOC_START between VMALLOC_END. similarly, the kernel code mapping is now in the VMALLOC area and should keep these area populated. Signed-off-by: Lecopzer Chen --- arch/arm64/mm/kasan_init.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index d8e66c78440e..d7ad3f1e9c4d 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -214,6 +214,7 @@ static void __init kasan_init_shadow(void) { u64 kimg_shadow_start, kimg_shadow_end; u64 mod_shadow_start, mod_shadow_end; + u64 vmalloc_shadow_start, vmalloc_shadow_end; phys_addr_t pa_start, pa_end; u64 i; =20 @@ -223,6 +224,9 @@ static void __init kasan_init_shadow(void) mod_shadow_start =3D (u64)kasan_mem_to_shadow((void *)MODULES_VADDR); mod_shadow_end =3D (u64)kasan_mem_to_shadow((void *)MODULES_END); =20 + vmalloc_shadow_start =3D (u64)kasan_mem_to_shadow((void *)VMALLOC_START= ); + vmalloc_shadow_end =3D (u64)kasan_mem_to_shadow((void *)VMALLOC_END); + /* * We are going to perform proper setup of shadow memory. * At first we should unmap early shadow (clear_pgds() call below). @@ -241,12 +245,21 @@ static void __init kasan_init_shadow(void) =20 kasan_populate_early_shadow(kasan_mem_to_shadow((void *)PAGE_END), (void *)mod_shadow_start); - kasan_populate_early_shadow((void *)kimg_shadow_end, - (void *)KASAN_SHADOW_END); + if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) { + kasan_populate_early_shadow((void *)vmalloc_shadow_end, + (void *)KASAN_SHADOW_END); + if (vmalloc_shadow_start > mod_shadow_end) + kasan_populate_early_shadow((void *)mod_shadow_end, + (void *)vmalloc_shadow_start); + + } else { + kasan_populate_early_shadow((void *)kimg_shadow_end, + (void *)KASAN_SHADOW_END); + if (kimg_shadow_start > mod_shadow_end) + kasan_populate_early_shadow((void *)mod_shadow_end, + (void *)kimg_shadow_start); + } =20 - if (kimg_shadow_start > mod_shadow_end) - kasan_populate_early_shadow((void *)mod_shadow_end, - (void *)kimg_shadow_start); =20 for_each_mem_range(i, &pa_start, &pa_end) { void *start =3D (void *)__phys_to_virt(pa_start); --=20 2.25.1