From nobody Tue Apr 28 09:51:47 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 5DBD5C433EF for ; Tue, 28 Jun 2022 15:43:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347938AbiF1Pnx (ORCPT ); Tue, 28 Jun 2022 11:43:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232822AbiF1Pnu (ORCPT ); Tue, 28 Jun 2022 11:43:50 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E4DA93615A; Tue, 28 Jun 2022 08:43:49 -0700 (PDT) Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 25SFgR68032966; Tue, 28 Jun 2022 15:43:41 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : content-transfer-encoding : mime-version; s=pp1; bh=neThbNghizSFP7EOZ7hK0Y1yq3+zbZIj9qScBcvSU4Q=; b=Ze14GAJN1A9UYMnCXlUff6RYneS42SsAvmYwGbw3CP4Dh6IjT7fvyoUN0htLNxhO4Y9k OyRc02b/3QUVg/ddhTNaHZ9z/6XrqVRCo09EPDVzbnwRpTr4sXfWno19shWFVNmByDCp +FcnZeNWE4/abfmkp/5mRcU6OHI/g3+qX8CXeUaE6KZyMDxcIqkGucpA3+KE2qaOlLCR p5xfyYgNFcNiNiZqOyISxeW2N+fV7YkBWN3hOysTuJEf2TSL6Qi2B0Q7YoLCG3WBgD4H F2CYQhm78xSjKu3vjZwlaNV+8v9CNrZutk2NLDGkv+b9QaPnxWQBjDao++pLhOqgxMMr Zw== Received: from ppma06fra.de.ibm.com (48.49.7a9f.ip4.static.sl-reverse.com [159.122.73.72]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3h04gwr114-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 28 Jun 2022 15:43:41 +0000 Received: from pps.filterd (ppma06fra.de.ibm.com [127.0.0.1]) by ppma06fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 25SFb6HD010444; Tue, 28 Jun 2022 15:43:38 GMT Received: from b06avi18626390.portsmouth.uk.ibm.com (b06avi18626390.portsmouth.uk.ibm.com [9.149.26.192]) by ppma06fra.de.ibm.com with ESMTP id 3gwsmhutqw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 28 Jun 2022 15:43:38 +0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 25SFgaOw22348146 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 28 Jun 2022 15:42:37 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6E60A52051; Tue, 28 Jun 2022 15:43:36 +0000 (GMT) Received: from li-NotSettable.ibm.com.com (unknown [9.43.54.243]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 3BE295204E; Tue, 28 Jun 2022 15:43:34 +0000 (GMT) From: "Naveen N. Rao" To: Greg KH , Cc: , , kexec@lists.infradead.org, Michael Ellerman , "Eric W. Biederman" , Andrew Morton Subject: [PATCH v4.19] kexec_file: drop weak attribute from arch_kexec_apply_relocations[_add] Date: Tue, 28 Jun 2022 21:12:47 +0530 Message-Id: <20220628154249.204911-2-naveen.n.rao@linux.vnet.ibm.com> X-Mailer: git-send-email 2.31.1 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: D4oakxCir4GpxG6QsefZYaPf6XBs_-oj X-Proofpoint-ORIG-GUID: D4oakxCir4GpxG6QsefZYaPf6XBs_-oj Content-Transfer-Encoding: quoted-printable X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-06-28_09,2022-06-28_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 mlxscore=0 adultscore=0 malwarescore=0 mlxlogscore=999 clxscore=1015 suspectscore=0 phishscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2206280063 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" commit 3e35142ef99fe6b4fe5d834ad43ee13cca10a2dc upstream. Since commit d1bcae833b32f1 ("ELF: Don't generate unused section symbols") [1], binutils (v2.36+) started dropping section symbols that it thought were unused. This isn't an issue in general, but with kexec_file.c, gcc is placing kexec_arch_apply_relocations[_add] into a separate .text.unlikely section and the section symbol ".text.unlikely" is being dropped. Due to this, recordmcount is unable to find a non-weak symbol in .text.unlikely to generate a relocation record against. Address this by dropping the weak attribute from these functions. Instead, follow the existing pattern of having architectures #define the name of the function they want to override in their headers. [1] https://sourceware.org/git/?p=3Dbinutils-gdb.git;a=3Dcommit;h=3Dd1bcae8= 33b32f1 [akpm@linux-foundation.org: arch/s390/include/asm/kexec.h needs linux/modul= e.h] Link: https://lkml.kernel.org/r/20220519091237.676736-1-naveen.n.rao@linux.= vnet.ibm.com Signed-off-by: Michael Ellerman Signed-off-by: Naveen N. Rao Cc: "Eric W. Biederman" Cc: Signed-off-by: Andrew Morton --- arch/s390/include/asm/kexec.h | 10 ++++++++ arch/x86/include/asm/kexec.h | 9 +++++++ include/linux/kexec.h | 46 +++++++++++++++++++++++++++++------ kernel/kexec_file.c | 34 -------------------------- 4 files changed, 57 insertions(+), 42 deletions(-) diff --git a/arch/s390/include/asm/kexec.h b/arch/s390/include/asm/kexec.h index 825dd0f7f22118..ba9b0e76470c52 100644 --- a/arch/s390/include/asm/kexec.h +++ b/arch/s390/include/asm/kexec.h @@ -9,6 +9,8 @@ #ifndef _S390_KEXEC_H #define _S390_KEXEC_H =20 +#include + #include #include /* @@ -69,4 +71,12 @@ int *kexec_file_update_kernel(struct kimage *iamge, extern const struct kexec_file_ops s390_kexec_image_ops; extern const struct kexec_file_ops s390_kexec_elf_ops; =20 +#ifdef CONFIG_KEXEC_FILE +struct purgatory_info; +int arch_kexec_apply_relocations_add(struct purgatory_info *pi, + Elf_Shdr *section, + const Elf_Shdr *relsec, + const Elf_Shdr *symtab); +#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add +#endif #endif /*_S390_KEXEC_H */ diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h index 5125fca472bb0b..0a41c62369f2cb 100644 --- a/arch/x86/include/asm/kexec.h +++ b/arch/x86/include/asm/kexec.h @@ -21,6 +21,7 @@ #ifndef __ASSEMBLY__ =20 #include +#include =20 #include #include @@ -217,6 +218,14 @@ extern int arch_kexec_post_alloc_pages(void *vaddr, un= signed int pages, extern void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages); #define arch_kexec_pre_free_pages arch_kexec_pre_free_pages =20 +#ifdef CONFIG_KEXEC_FILE +struct purgatory_info; +int arch_kexec_apply_relocations_add(struct purgatory_info *pi, + Elf_Shdr *section, + const Elf_Shdr *relsec, + const Elf_Shdr *symtab); +#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add +#endif #endif =20 typedef void crash_vmclear_fn(void); diff --git a/include/linux/kexec.h b/include/linux/kexec.h index fe9f6f2dd811d2..29bffbc6d73aa7 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -174,14 +174,6 @@ int kexec_purgatory_get_set_symbol(struct kimage *imag= e, const char *name, bool get_value); void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *na= me); =20 -int __weak arch_kexec_apply_relocations_add(struct purgatory_info *pi, - Elf_Shdr *section, - const Elf_Shdr *relsec, - const Elf_Shdr *symtab); -int __weak arch_kexec_apply_relocations(struct purgatory_info *pi, - Elf_Shdr *section, - const Elf_Shdr *relsec, - const Elf_Shdr *symtab); =20 int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf, int (*func)(struct resource *, void *)); @@ -206,6 +198,44 @@ extern int crash_exclude_mem_range(struct crash_mem *m= em, unsigned long long mend); extern int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_m= ap, void **addr, unsigned long *sz); + +#ifndef arch_kexec_apply_relocations_add +/* + * arch_kexec_apply_relocations_add - apply relocations of type RELA + * @pi: Purgatory to be relocated. + * @section: Section relocations applying to. + * @relsec: Section containing RELAs. + * @symtab: Corresponding symtab. + * + * Return: 0 on success, negative errno on error. + */ +static inline int +arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *sect= ion, + const Elf_Shdr *relsec, const Elf_Shdr *symtab) +{ + pr_err("RELA relocation unsupported.\n"); + return -ENOEXEC; +} +#endif + +#ifndef arch_kexec_apply_relocations +/* + * arch_kexec_apply_relocations - apply relocations of type REL + * @pi: Purgatory to be relocated. + * @section: Section relocations applying to. + * @relsec: Section containing RELs. + * @symtab: Corresponding symtab. + * + * Return: 0 on success, negative errno on error. + */ +static inline int +arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section, + const Elf_Shdr *relsec, const Elf_Shdr *symtab) +{ + pr_err("REL relocation unsupported.\n"); + return -ENOEXEC; +} +#endif #endif /* CONFIG_KEXEC_FILE */ =20 struct kimage { diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index 89d41c0a10f1e5..ab1934a2b2e6e9 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -110,40 +110,6 @@ int __weak arch_kexec_kernel_verify_sig(struct kimage = *image, void *buf, } #endif =20 -/* - * arch_kexec_apply_relocations_add - apply relocations of type RELA - * @pi: Purgatory to be relocated. - * @section: Section relocations applying to. - * @relsec: Section containing RELAs. - * @symtab: Corresponding symtab. - * - * Return: 0 on success, negative errno on error. - */ -int __weak -arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *sect= ion, - const Elf_Shdr *relsec, const Elf_Shdr *symtab) -{ - pr_err("RELA relocation unsupported.\n"); - return -ENOEXEC; -} - -/* - * arch_kexec_apply_relocations - apply relocations of type REL - * @pi: Purgatory to be relocated. - * @section: Section relocations applying to. - * @relsec: Section containing RELs. - * @symtab: Corresponding symtab. - * - * Return: 0 on success, negative errno on error. - */ -int __weak -arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section, - const Elf_Shdr *relsec, const Elf_Shdr *symtab) -{ - pr_err("REL relocation unsupported.\n"); - return -ENOEXEC; -} - /* * Free up memory used by kernel, initrd, and command line. This is tempor= ary * memory allocation which is not needed any more after these buffers have base-commit: 6a10ec7750739d143e6df5a8085fa389b3258866 --=20 2.36.1