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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id u26sm2152216pgo.71.2020.06.22.13.49.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Jun 2020 13:49:17 -0700 (PDT) From: Kees Cook To: Russell King Subject: [PATCH v2 1/2] arm/build: Warn on orphan section placement Date: Mon, 22 Jun 2020 13:49:14 -0700 Message-Id: <20200622204915.2987555-2-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200622204915.2987555-1-keescook@chromium.org> References: <20200622204915.2987555-1-keescook@chromium.org> MIME-Version: 1.0 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:1035 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender 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: Kees Cook , Arnd Bergmann , Masahiro Yamada , Nick Desaulniers , linux-kernel@vger.kernel.org, Nathan Chancellor , Will Deacon , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org We don't want to depend on the linker's orphan section placement heuristics as these can vary between linkers, and may change between versions. All sections need to be explicitly named in the linker script. Specifically, this would have made a recently fixed bug very obvious: ld: warning: orphan section `.fixup' from `arch/arm/lib/copy_from_user.o' being placed in section `.fixup' Refactor linker script include file for use in standard and XIP linker scripts, as well as in the coming boot linker script changes. Add debug sections explicitly. Create ARM_COMMON_DISCARD macro with unneeded sections .ARM.attributes, .iplt, .rel.iplt, .igot.plt, and .modinfo. Create ARM_STUBS_TEXT macro with missed text stub sections .vfp11_veneer, and .v4_bx. Finally enable orphan section warning. Signed-off-by: Kees Cook --- arch/arm/Makefile | 4 ++++ .../arm/{kernel => include/asm}/vmlinux.lds.h | 22 ++++++++++++++----- arch/arm/kernel/vmlinux-xip.lds.S | 5 ++--- arch/arm/kernel/vmlinux.lds.S | 5 ++--- 4 files changed, 25 insertions(+), 11 deletions(-) rename arch/arm/{kernel => include/asm}/vmlinux.lds.h (92%) diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 59fde2d598d8..e414e3732b3a 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -16,6 +16,10 @@ LDFLAGS_vmlinux += --be8 KBUILD_LDFLAGS_MODULE += --be8 endif +# We never want expected sections to be placed heuristically by the +# linker. All sections should be explicitly named in the linker script. +LDFLAGS_vmlinux += --orphan-handling=warn + ifeq ($(CONFIG_ARM_MODULE_PLTS),y) KBUILD_LDS_MODULE += $(srctree)/arch/arm/kernel/module.lds endif diff --git a/arch/arm/kernel/vmlinux.lds.h b/arch/arm/include/asm/vmlinux.lds.h similarity index 92% rename from arch/arm/kernel/vmlinux.lds.h rename to arch/arm/include/asm/vmlinux.lds.h index 381a8e105fa5..3d88ea74f4cd 100644 --- a/arch/arm/kernel/vmlinux.lds.h +++ b/arch/arm/include/asm/vmlinux.lds.h @@ -1,4 +1,5 @@ /* SPDX-License-Identifier: GPL-2.0 */ +#include #ifdef CONFIG_HOTPLUG_CPU #define ARM_CPU_DISCARD(x) @@ -37,6 +38,13 @@ *(.idmap.text) \ __idmap_text_end = .; \ +#define ARM_COMMON_DISCARD \ + *(.ARM.attributes) \ + *(.iplt) *(.rel.iplt) *(.igot.plt) \ + *(.modinfo) \ + *(.discard) \ + *(.discard.*) + #define ARM_DISCARD \ *(.ARM.exidx.exit.text) \ *(.ARM.extab.exit.text) \ @@ -49,8 +57,14 @@ EXIT_CALL \ ARM_MMU_DISCARD(*(.text.fixup)) \ ARM_MMU_DISCARD(*(__ex_table)) \ - *(.discard) \ - *(.discard.*) + ARM_COMMON_DISCARD + +#define ARM_STUBS_TEXT \ + *(.gnu.warning) \ + *(.glue_7t) \ + *(.glue_7) \ + *(.vfp11_veneer) \ + *(.v4_bx) #define ARM_TEXT \ IDMAP_TEXT \ @@ -64,9 +78,7 @@ CPUIDLE_TEXT \ LOCK_TEXT \ KPROBES_TEXT \ - *(.gnu.warning) \ - *(.glue_7) \ - *(.glue_7t) \ + ARM_STUBS_TEXT \ . = ALIGN(4); \ *(.got) /* Global offset table */ \ ARM_CPU_KEEP(PROC_INFO) diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S index 6d2be994ae58..0807f40844a2 100644 --- a/arch/arm/kernel/vmlinux-xip.lds.S +++ b/arch/arm/kernel/vmlinux-xip.lds.S @@ -9,15 +9,13 @@ #include -#include +#include #include #include #include #include #include -#include "vmlinux.lds.h" - OUTPUT_ARCH(arm) ENTRY(stext) @@ -152,6 +150,7 @@ SECTIONS _end = .; STABS_DEBUG + DWARF_DEBUG } /* diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index 7f24bc08403e..969205f125ca 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -9,15 +9,13 @@ #else #include -#include +#include #include #include #include #include #include -#include "vmlinux.lds.h" - OUTPUT_ARCH(arm) ENTRY(stext) @@ -151,6 +149,7 @@ SECTIONS _end = .; STABS_DEBUG + DWARF_DEBUG } #ifdef CONFIG_STRICT_KERNEL_RWX From patchwork Mon Jun 22 20:49:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 11619103 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2C52714E3 for ; 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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id i7sm12270469pgr.86.2020.06.22.13.49.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Jun 2020 13:49:17 -0700 (PDT) From: Kees Cook To: Russell King Subject: [PATCH v2 2/2] arm/boot: Warn on orphan section placement Date: Mon, 22 Jun 2020 13:49:15 -0700 Message-Id: <20200622204915.2987555-3-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200622204915.2987555-1-keescook@chromium.org> References: <20200622204915.2987555-1-keescook@chromium.org> MIME-Version: 1.0 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:441 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender 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: Kees Cook , Arnd Bergmann , Masahiro Yamada , Nick Desaulniers , linux-kernel@vger.kernel.org, Nathan Chancellor , Will Deacon , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org We don't want to depend on the linker's orphan section placement heuristics as these can vary between linkers, and may change between versions. All sections need to be explicitly named in the linker script. Use common macros for debug sections, discards, and text stubs. Add discards for unwanted .note, and .rel sections. Finally, enable orphan section warning. Signed-off-by: Kees Cook --- arch/arm/boot/compressed/Makefile | 2 ++ arch/arm/boot/compressed/vmlinux.lds.S | 17 +++++++---------- 2 files changed, 9 insertions(+), 10 deletions(-) diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 00602a6fba04..b8a97d81662d 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -128,6 +128,8 @@ endif LDFLAGS_vmlinux += --no-undefined # Delete all temporary local symbols LDFLAGS_vmlinux += -X +# Report orphan sections +LDFLAGS_vmlinux += --orphan-handling=warn # Next argument is a linker script LDFLAGS_vmlinux += -T diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S index 09ac33f52814..c2a8509f876f 100644 --- a/arch/arm/boot/compressed/vmlinux.lds.S +++ b/arch/arm/boot/compressed/vmlinux.lds.S @@ -2,6 +2,7 @@ /* * Copyright (C) 2000 Russell King */ +#include #ifdef CONFIG_CPU_ENDIAN_BE8 #define ZIMAGE_MAGIC(x) ( (((x) >> 24) & 0x000000ff) | \ @@ -17,8 +18,11 @@ ENTRY(_start) SECTIONS { /DISCARD/ : { + ARM_COMMON_DISCARD *(.ARM.exidx*) *(.ARM.extab*) + *(.note.*) + *(.rel.*) /* * Discard any r/w data - this produces a link error if we have any, * which is required for PIC decompression. Local data generates @@ -36,9 +40,7 @@ SECTIONS *(.start) *(.text) *(.text.*) - *(.gnu.warning) - *(.glue_7t) - *(.glue_7) + ARM_STUBS_TEXT } .table : ALIGN(4) { _table_start = .; @@ -128,12 +130,7 @@ SECTIONS PROVIDE(__pecoff_data_size = ALIGN(512) - ADDR(.data)); PROVIDE(__pecoff_end = ALIGN(512)); - .stab 0 : { *(.stab) } - .stabstr 0 : { *(.stabstr) } - .stab.excl 0 : { *(.stab.excl) } - .stab.exclstr 0 : { *(.stab.exclstr) } - .stab.index 0 : { *(.stab.index) } - .stab.indexstr 0 : { *(.stab.indexstr) } - .comment 0 : { *(.comment) } + STABS_DEBUG + DWARF_DEBUG } ASSERT(_edata_real == _edata, "error: zImage file size is incorrect");