[{"id":3686840,"web_url":"http://patchwork.ozlabs.org/comment/3686840/","msgid":"<8bb836b5-daeb-491c-8588-5cde81580577@kernel.org>","date":"2026-05-06T06:37:19","subject":"Re: [PATCH V2] powerpc/text-patching: simplify the implementation of\n ppc_kallsyms_lookup_name()","submitter":{"id":92089,"url":"http://patchwork.ozlabs.org/api/people/92089/","name":"Christophe Leroy (CS GROUP)","email":"chleroy@kernel.org"},"content":"Le 06/05/2026 à 04:11, Xie Yuanbin a écrit :\n> ppc_kallsyms_lookup_name() is called only twice in the kernel code, and\n> the parameters are all constant strings. strnlen(name, KSYM_NAME_LEN) is\n> called inside ppc_kallsyms_lookup_name(), when the compiler detects that\n> KSYM_NAME_LEN is larger then the constant strings,\n> the following error will be triggered:\n> ```log\n> CC arch/powerpc/kernel/optprobes.o\n> In file included from ./arch/powerpc/include/asm/kprobes.h:24,\n> from ./include/linux/kprobes.h:31,\n> from arch/powerpc/kernel/optprobes.c:8:\n> In function 'ppc_kallsyms_lookup_name',\n> inlined from 'arch_prepare_optimized_kprobe' at arch/powerpc/kernel/optprobes.c:209:21:\n> ./arch/powerpc/include/asm/text-patching.h:232:13: error: 'strnlen' specified bound 512 exceeds source size 19 [-Werror=stringop-overread]\n> 232 | if (strnlen(name, KSYM_NAME_LEN) >= KSYM_NAME_LEN)\n> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~\n> In function 'ppc_kallsyms_lookup_name',\n> inlined from 'arch_prepare_optimized_kprobe' at arch/powerpc/kernel/optprobes.c:210:22:\n> ./arch/powerpc/include/asm/text-patching.h:232:13: error: 'strnlen' specified bound 512 exceeds source size 13 [-Werror=stringop-overread]\n> 232 | if (strnlen(name, KSYM_NAME_LEN) >= KSYM_NAME_LEN)\n> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~\n> cc1: all warnings being treated as errors\n> ```\n> \n> The error can be reproduced in the following ways:\n> Use lastest linux-next source, change ppc_kallsyms_lookup_name() to\n> __always_inline, use default ppc64_defconfig, set CONFIG_EXPERT=y,\n> CONFIG_PPC64_BIG_ENDIAN_ELF_ABI_V2=n, CONFIG_CC_OPTIMIZE_FOR_SIZE=y,\n> and use gcc-14 or a later version for compilation.\n> \n> Since ppc_kallsyms_lookup_name() is called only twice in the kernel,\n> and the parameters are all constant strins, simplify the implementation\n> of ppc_kallsyms_lookup_name() and avoid calling strnlen().\n> \n> Cc: Andy Shevchenko \n> Cc: Kees Cook \n> Suggested-by: Christophe Leroy (CS GROUP) \n> Signed-off-by: Xie Yuanbin \n\nReviewed-by: Christophe Leroy (CS GROUP) \n\n> ---\n> v1->v2: https://lore.kernel.org/20260205100517.292858-2-xieyuanbin1@huawei.com\n> - Not use strlen()\n> \n> arch/powerpc/include/asm/text-patching.h | 50 ++++++++----------------\n> 1 file changed, 17 insertions(+), 33 deletions(-)\n> \n> diff --git a/arch/powerpc/include/asm/text-patching.h b/arch/powerpc/include/asm/text-patching.h\n> index e7f14720f630..2d3f698cb4f1 100644\n> --- a/arch/powerpc/include/asm/text-patching.h\n> +++ b/arch/powerpc/include/asm/text-patching.h\n> @@ -221,39 +221,23 @@ static inline unsigned long ppc_global_function_entry(void *func)\n> * - For ABIv1, we lookup the dot variant.\n> * - For ABIv2, we return the local entry point.\n> */\n> -static inline unsigned long ppc_kallsyms_lookup_name(const char *name)\n> -{\n> -\tunsigned long addr;\n> -#ifdef CONFIG_PPC64_ELF_ABI_V1\n> -\t/* check for dot variant */\n> -\tchar dot_name[1 + KSYM_NAME_LEN];\n> -\tbool dot_appended = false;\n> -\n> -\tif (strnlen(name, KSYM_NAME_LEN) >= KSYM_NAME_LEN)\n> -\t\treturn 0;\n> -\n> -\tif (name[0] != '.') {\n> -\t\tdot_name[0] = '.';\n> -\t\tdot_name[1] = '\\0';\n> -\t\tstrlcat(dot_name, name, sizeof(dot_name));\n> -\t\tdot_appended = true;\n> -\t} else {\n> -\t\tdot_name[0] = '\\0';\n> -\t\tstrlcat(dot_name, name, sizeof(dot_name));\n> -\t}\n> -\taddr = kallsyms_lookup_name(dot_name);\n> -\tif (!addr && dot_appended)\n> -\t\t/* Let's try the original non-dot symbol lookup\t*/\n> -\t\taddr = kallsyms_lookup_name(name);\n> -#elif defined(CONFIG_PPC64_ELF_ABI_V2)\n> -\taddr = kallsyms_lookup_name(name);\n> -\tif (addr)\n> -\t\taddr = ppc_function_entry((void *)addr);\n> -#else\n> -\taddr = kallsyms_lookup_name(name);\n> -#endif\n> -\treturn addr;\n> -}\n> +static inline unsigned long __ppc_kallsyms_lookup_name(const char *name)\n> +{\n> +\tunsigned long addr = kallsyms_lookup_name(name);\n> +\n> +\tif (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V1) && !addr)\n> +\t\taddr = kallsyms_lookup_name(name + 1);\n> +\tif (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2) && addr)\n> +\t\taddr = ppc_function_entry((void *)addr);\n> +\n> +\treturn addr;\n> +}\n> +\n> +#ifdef CONFIG_PPC64_ELF_ABI_V1\n> +#define ppc_kallsyms_lookup_name(x)\t__ppc_kallsyms_lookup_name(\".\" x)\n> +#else\n> +#define ppc_kallsyms_lookup_name(x)\t__ppc_kallsyms_lookup_name(x)\n> +#endif\n> \n> /*\n> * Some instruction encodings commonly used in dynamic ftracing","headers":{"Return-Path":"\n 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of\n ppc_kallsyms_lookup_name()","To":"Xie Yuanbin , maddy@linux.ibm.com,\n mpe@ellerman.id.au, npiggin@gmail.com, andriy.shevchenko@intel.com,\n kees@kernel.org","Cc":"linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,\n lilinjie8@huawei.com, liaohua4@huawei.com","References":"<20260506021143.13797-1-xieyuanbin1@huawei.com>","Content-Language":"fr-FR","From":"\"Christophe Leroy (CS GROUP)\" ","In-Reply-To":"<20260506021143.13797-1-xieyuanbin1@huawei.com>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-0.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3686880,"web_url":"http://patchwork.ozlabs.org/comment/3686880/","msgid":"","date":"2026-05-06T08:44:43","subject":"Re: [PATCH V2] powerpc/text-patching: simplify the implementation of\n ppc_kallsyms_lookup_name()","submitter":{"id":46495,"url":"http://patchwork.ozlabs.org/api/people/46495/","name":"Andy Shevchenko","email":"andriy.shevchenko@intel.com"},"content":"On Wed, May 06, 2026 at 10:11:43AM +0800, Xie Yuanbin wrote:\n> ppc_kallsyms_lookup_name() is called only twice in the kernel code, and\n> the parameters are all constant strings. strnlen(name, KSYM_NAME_LEN) is\n> called inside ppc_kallsyms_lookup_name(), when the compiler detects that\n> KSYM_NAME_LEN is larger then the constant strings,\n> the following error will be triggered:\n> ```log\n> CC arch/powerpc/kernel/optprobes.o\n> In file included from ./arch/powerpc/include/asm/kprobes.h:24,\n> from ./include/linux/kprobes.h:31,\n> from arch/powerpc/kernel/optprobes.c:8:\n> In function 'ppc_kallsyms_lookup_name',\n> inlined from 'arch_prepare_optimized_kprobe' at arch/powerpc/kernel/optprobes.c:209:21:\n> ./arch/powerpc/include/asm/text-patching.h:232:13: error: 'strnlen' specified bound 512 exceeds source size 19 [-Werror=stringop-overread]\n> 232 | if (strnlen(name, KSYM_NAME_LEN) >= KSYM_NAME_LEN)\n> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~\n> In function 'ppc_kallsyms_lookup_name',\n> inlined from 'arch_prepare_optimized_kprobe' at arch/powerpc/kernel/optprobes.c:210:22:\n> ./arch/powerpc/include/asm/text-patching.h:232:13: error: 'strnlen' specified bound 512 exceeds source size 13 [-Werror=stringop-overread]\n> 232 | if (strnlen(name, KSYM_NAME_LEN) >= KSYM_NAME_LEN)\n> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~\n> cc1: all warnings being treated as errors\n> ```\n\nThis log can be made more readable:\n\n ```log\n In function 'ppc_kallsyms_lookup_name',\n ./arch/powerpc/include/asm/text-patching.h:232:13: error: 'strnlen' specified bound 512 exceeds source size 19 [-Werror=stringop-overread]\n 232 | if (strnlen(name, KSYM_NAME_LEN) >= KSYM_NAME_LEN)\n | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~\n ```\n\n> The error can be reproduced in the following ways:\n> Use lastest linux-next source, change ppc_kallsyms_lookup_name() to\n> __always_inline, use default ppc64_defconfig, set CONFIG_EXPERT=y,\n> CONFIG_PPC64_BIG_ENDIAN_ELF_ABI_V2=n, CONFIG_CC_OPTIMIZE_FOR_SIZE=y,\n> and use gcc-14 or a later version for compilation.\n> \n> Since ppc_kallsyms_lookup_name() is called only twice in the kernel,\n> and the parameters are all constant strins, simplify the implementation\n> of ppc_kallsyms_lookup_name() and avoid calling strnlen().\n\n> Cc: Andy Shevchenko \n> Cc: Kees Cook \n\nPlease, keep Cc list...\n\n> Suggested-by: Christophe Leroy (CS GROUP) \n> Signed-off-by: Xie Yuanbin \n> ---\n\n...somewhere here in the comments block. This will reduce unneeded churn\nin the commit message when maintainer applies the patch.\n\n> v1->v2: https://lore.kernel.org/20260205100517.292858-2-xieyuanbin1@huawei.com\n> - Not use strlen()","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=QmTCwjjD;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-20509-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=198.175.65.14","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=intel.com","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=QmTCwjjD;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=intel.com\n (client-ip=198.175.65.14; 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a=\"82848803\"","E=Sophos;i=\"6.23,219,1770624000\";\n d=\"scan'208\";a=\"82848803\""],"X-ExtLoop1":"1","Date":"Wed, 6 May 2026 11:44:43 +0300","From":"Andy Shevchenko ","To":"Xie Yuanbin ","Cc":"chleroy@kernel.org, maddy@linux.ibm.com, mpe@ellerman.id.au,\n\tnpiggin@gmail.com, kees@kernel.org, linuxppc-dev@lists.ozlabs.org,\n\tlinux-kernel@vger.kernel.org, lilinjie8@huawei.com,\n\tliaohua4@huawei.com","Subject":"Re: [PATCH V2] powerpc/text-patching: simplify the implementation of\n ppc_kallsyms_lookup_name()","Message-ID":"","References":"<20260506021143.13797-1-xieyuanbin1@huawei.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260506021143.13797-1-xieyuanbin1@huawei.com>","Organization":"Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6\n krs, Bertel Jungin Aukio 5, 02600 Espoo","X-Spam-Status":"No, score=-2.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}}]