From nobody Wed Jul 1 18:50:39 2026 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 7F962C433F5 for ; Tue, 18 Jan 2022 09:45:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233740AbiARJp0 (ORCPT ); Tue, 18 Jan 2022 04:45:26 -0500 Received: from mailgw02.mediatek.com ([210.61.82.184]:38576 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S229620AbiARJpR (ORCPT ); Tue, 18 Jan 2022 04:45:17 -0500 X-UUID: 3ac0b93d468c4530814d3e7583a6dd19-20220118 X-UUID: 3ac0b93d468c4530814d3e7583a6dd19-20220118 Received: from mtkcas10.mediatek.inc [(172.21.101.39)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1560820504; Tue, 18 Jan 2022 17:45:12 +0800 Received: from mtkexhb01.mediatek.inc (172.21.101.102) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 18 Jan 2022 17:45:11 +0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkexhb01.mediatek.inc (172.21.101.102) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 18 Jan 2022 17:45:10 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 18 Jan 2022 17:45:10 +0800 From: Lecopzer Chen To: CC: Russell King , Andrey Ryabinin , Alexander Potapenko , "Andrey Konovalov" , Dmitry Vyukov , Matthias Brugger , Arnd Bergmann , Linus Walleij , , "Geert Uytterhoeven" , Ard Biesheuvel , Mark Rutland , Anshuman Khandual , Lukas Bulwahn , Masahiro Yamada , , , , Lecopzer Chen Subject: [PATCH 1/2] arm: kasan: support CONFIG_KASAN_VMALLOC Date: Tue, 18 Jan 2022 17:44:49 +0800 Message-ID: <20220118094450.7730-2-lecopzer.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220118094450.7730-1-lecopzer.chen@mediatek.com> References: <20220118094450.7730-1-lecopzer.chen@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Simply make shadow of vmalloc area mapped on demand. This can fix ARM_MODULE_PLTS with KASAN and provide first step to support CONFIG_VMAP_STACK in ARM. Signed-off-by: Lecopzer Chen --- arch/arm/Kconfig | 1 + arch/arm/mm/kasan_init.c | 6 +++++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fabe39169b12..f97f2c416be0 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -72,6 +72,7 @@ config ARM select HAVE_ARCH_KFENCE if MMU && !XIP_KERNEL select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL + select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN select HAVE_ARCH_MMAP_RND_BITS if MMU select HAVE_ARCH_PFN_VALID select HAVE_ARCH_SECCOMP diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c index 5ad0d6c56d56..29caee9c79ce 100644 --- a/arch/arm/mm/kasan_init.c +++ b/arch/arm/mm/kasan_init.c @@ -236,7 +236,11 @@ void __init kasan_init(void) =20 clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END); =20 - kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START), + if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) + kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START), + kasan_mem_to_shadow((void *)VMALLOC_END)); + + kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_END), kasan_mem_to_shadow((void *)-1UL) + 1); =20 for_each_mem_range(i, &pa_start, &pa_end) { --=20 2.25.1 From nobody Wed Jul 1 18:50:39 2026 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 A883DC433EF for ; Tue, 18 Jan 2022 09:45:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233912AbiARJpa (ORCPT ); Tue, 18 Jan 2022 04:45:30 -0500 Received: from mailgw02.mediatek.com ([210.61.82.184]:38630 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S233603AbiARJpS (ORCPT ); Tue, 18 Jan 2022 04:45:18 -0500 X-UUID: e1587ceefc7f4901ab973fa118381a65-20220118 X-UUID: e1587ceefc7f4901ab973fa118381a65-20220118 Received: from mtkcas11.mediatek.inc [(172.21.101.40)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 50564287; Tue, 18 Jan 2022 17:45:13 +0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.15; Tue, 18 Jan 2022 17:45:11 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 18 Jan 2022 17:45:11 +0800 From: Lecopzer Chen To: CC: Russell King , Andrey Ryabinin , Alexander Potapenko , "Andrey Konovalov" , Dmitry Vyukov , Matthias Brugger , Arnd Bergmann , Linus Walleij , , "Geert Uytterhoeven" , Ard Biesheuvel , Mark Rutland , Anshuman Khandual , Lukas Bulwahn , Masahiro Yamada , , , , Lecopzer Chen Subject: [PATCH 2/2] arm: kconfig: fix MODULE_PLTS for KASAN with KASAN_VMALLOC Date: Tue, 18 Jan 2022 17:44:50 +0800 Message-ID: <20220118094450.7730-3-lecopzer.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220118094450.7730-1-lecopzer.chen@mediatek.com> References: <20220118094450.7730-1-lecopzer.chen@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When we run out of module space address with ko insertion, and with MODULE_PLTS, module would turn to try to find memory from VMALLOC address space. Unfortunately, with KASAN enabled, VMALLOC doesn't work without KASAN_VMALLOC, thus select KASAN_VMALLOC by default. 8<--- cut here --- Unable to handle kernel paging request at virtual address bd300860 [bd300860] *pgd=3D41cf1811, *pte=3D41cf26df, *ppte=3D41cf265f Internal error: Oops: 80f [#1] PREEMPT SMP ARM Modules linked in: hello(O+) CPU: 0 PID: 89 Comm: insmod Tainted: G O 5.16.0-rc6+ #19 Hardware name: Generic DT based system PC is at mmioset+0x30/0xa8 LR is at 0x0 pc : [] lr : [<00000000>] psr: 20000013 sp : c451fc18 ip : bd300860 fp : c451fc2c r10: f18042cc r9 : f18042d0 r8 : 00000000 r7 : 00000001 r6 : 00000003 r5 : 01312d00 r4 : f1804300 r3 : 00000000 r2 : 00262560 r1 : 00000000 r0 : bd300860 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c5387d Table: 43e9406a DAC: 00000051 Register r0 information: non-paged memory Register r1 information: NULL pointer Register r2 information: non-paged memory Register r3 information: NULL pointer Register r4 information: 4887-page vmalloc region starting at 0xf1802000 a= llocated at load_module+0x14f4/0x32a8 Register r5 information: non-paged memory Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: NULL pointer Register r9 information: 4887-page vmalloc region starting at 0xf1802000 a= llocated at load_module+0x14f4/0x32a8 Register r10 information: 4887-page vmalloc region starting at 0xf1802000 = allocated at load_module+0x14f4/0x32a8 Register r11 information: non-slab/vmalloc memory Register r12 information: non-paged memory Process insmod (pid: 89, stack limit =3D 0xc451c000) Stack: (0xc451fc18 to 0xc4520000) fc00: f18041f0 c0480= 3a4 fc20: c451fc44 c451fc30 c048053c c0480358 f1804030 01312cff c451fc64 c451f= c48 fc40: c047f330 c0480500 f18040c0 c1b52ccc 00000001 c5be7700 c451fc74 c451f= c68 fc60: f1802098 c047f300 c451fcb4 c451fc78 c026106c f180208c c4880004 00000= 000 fc80: c451fcb4 bf001000 c044ff48 c451fec0 f18040c0 00000000 c1b54cc4 00000= 000 fca0: c451fdf0 f1804268 c451fe64 c451fcb8 c0264e88 c0260d48 ffff8000 00007= fff fcc0: f18040c0 c025cd00 c451fd14 00000003 0157f008 f1804258 f180425c f1804= 174 fce0: f1804154 f180424c f18041f0 f180414c f1804178 f18041c0 bf0025d4 188a3= fa8 fd00: 0000009e f1804170 f2b18000 c451ff10 c0d92e40 f180416c c451feec 00000= 001 fd20: 00000000 c451fec8 c451fe20 c451fed0 f18040cc 00000000 f17ea000 c451f= dc0 fd40: 41b58ab3 c1387729 c0261c28 c047fb5c c451fe2c c451fd60 c0525308 c0480= 33c fd60: 188a3fb4 c3ccb090 c451fe00 c3ccb080 00000000 00000000 00016920 00000= 000 fd80: c02d0388 c047f55c c02d0388 00000000 c451fddc c451fda0 c02d0388 00000= 000 fda0: 41b58ab3 c13a72d0 c0524ff0 c1705f48 c451fdfc c451fdc0 c02d0388 c047f= 55c fdc0: 00016920 00000000 00000003 c1bb2384 c451fdfc c3ccb080 c1bb2384 00000= 000 fde0: 00000000 00000000 00000000 00000000 c451fe1c c451fe00 c04e9d70 c1705= f48 fe00: c1b54cc4 c1bbc71c c3ccb080 00000000 c3ccb080 00000000 00000003 c451f= ec0 fe20: c451fe64 c451fe30 c0525918 c0524ffc c451feb0 c1705f48 00000000 c1b54= cc4 fe40: b78a3fd0 c451ff60 00000000 0157f008 00000003 c451fec0 c451ffa4 c451f= e68 fe60: c0265480 c0261c34 c451feb0 7fffffff 00000000 00000002 00000000 c4880= 000 fe80: 41b58ab3 c138777b c02652cc c04803ec 000a0000 c451ff00 ffffff9c b6ac9= f60 fea0: c451fed4 c1705f48 c04a4a90 b78a3fdc f17ea000 ffffff9c b6ac9f60 c0100= 244 fec0: f17ea21a f17ea300 f17ea000 00016920 f1800240 f18000ac f17fb7dc 01316= 000 fee0: 013161b0 00002590 01316250 00000000 00000000 00000000 00002580 00000= 029 ff00: 0000002a 00000013 00000000 0000000c 00000000 00000000 0157f004 c451f= fb0 ff20: c1719be0 aed6f410 c451ff74 c451ff38 c0c4103c c0c407d0 c451ff84 c451f= f48 ff40: 00000805 c02c8658 c1604230 c1719c30 00000805 0157f004 00000005 c451f= fb0 ff60: c1719be0 aed6f410 c451ffac c451ff78 c0122130 c1705f48 c451ffac 0157f= 008 ff80: 00000006 0000005f 0000017b c0100244 c4880000 0000017b 00000000 c451f= fa8 ffa0: c0100060 c02652d8 0157f008 00000006 00000003 0157f008 00000000 b6ac9= f60 ffc0: 0157f008 00000006 0000005f 0000017b 00000000 00000000 aed85f74 00000= 000 ffe0: b6ac9cd8 b6ac9cc8 00030200 aecf2d60 a0000010 00000003 00000000 00000= 000 Backtrace: [] (kasan_poison) from [] (kasan_unpoison+0x48/0x5c) [] (kasan_unpoison) from [] (__asan_register_globals+0= x3c/0x64) r5:01312cff r4:f1804030 [] (__asan_register_globals) from [] (_sub_I_65535_1+0= x18/0xf80 [hello]) r7:c5be7700 r6:00000001 r5:c1b52ccc r4:f18040c0 [] (_sub_I_65535_1 [hello]) from [] (do_init_module+0x= 330/0x72c) [] (do_init_module) from [] (load_module+0x3260/0x32a8) r10:f1804268 r9:c451fdf0 r8:00000000 r7:c1b54cc4 r6:00000000 r5:f18040c0 r4:c451fec0 [] (load_module) from [] (sys_finit_module+0x1b4/0x1e8) r10:c451fec0 r9:00000003 r8:0157f008 r7:00000000 r6:c451ff60 r5:b78a3fd0 r4:c1b54cc4 [] (sys_finit_module) from [] (ret_fast_syscall+0x0/0x= 1c) Exception stack(0xc451ffa8 to 0xc451fff0) ffa0: 0157f008 00000006 00000003 0157f008 00000000 b6ac9= f60 ffc0: 0157f008 00000006 0000005f 0000017b 00000000 00000000 aed85f74 00000= 000 ffe0: b6ac9cd8 b6ac9cc8 00030200 aecf2d60 r10:0000017b r9:c4880000 r8:c0100244 r7:0000017b r6:0000005f r5:00000006 r4:0157f008 Code: e92d4100 e1a08001 e1a0e003 e2522040 (a8ac410a) ---[ end trace df6e12843197b6f5 ]--- Signed-off-by: Lecopzer Chen --- arch/arm/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index f97f2c416be0..d219179d3254 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1514,6 +1514,7 @@ config ARCH_WANT_GENERAL_HUGETLB config ARM_MODULE_PLTS bool "Use PLTs to allow module memory to spill over into vmalloc area" depends on MODULES + select KASAN_VMALLOC if KASAN default y help Allocate PLTs when loading modules so that jumps and calls whose --=20 2.25.1