[{"id":3678539,"web_url":"http://patchwork.ozlabs.org/comment/3678539/","msgid":"","date":"2026-04-17T07:53:28","subject":"Re: [PATCH] powerpc/fadump: reject empty bootargs_append writes","submitter":{"id":92089,"url":"http://patchwork.ozlabs.org/api/people/92089/","name":"Christophe Leroy (CS GROUP)","email":"chleroy@kernel.org"},"content":"Le 17/04/2026 à 09:39, Pengpeng Hou a écrit :\n> bootargs_append_store() indexes params[count - 1] when stripping a\n> trailing newline from the sysfs write buffer.\n> \n> kernfs passes zero-length writes through to the store callback, so an\n> empty write makes that newline check read before the start of params.\n> \n> Reject empty writes before looking at the last input byte.\n> \n> Fixes: 683eab94da75 (\"powerpc/fadump: setup additional parameters for dump capture kernel\")\n> Cc: stable@vger.kernel.org\n> \n> Signed-off-by: Pengpeng Hou \n> ---\n> arch/powerpc/kernel/fadump.c | 3 +++\n> 1 file changed, 3 insertions(+)\n> \n> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c\n> index 4ebc333dd786..03ab5565e420 100644\n> --- a/arch/powerpc/kernel/fadump.c\n> +++ b/arch/powerpc/kernel/fadump.c\n> @@ -1479,6 +1479,9 @@ static ssize_t bootargs_append_store(struct kobject *kobj,\n> \tif (!fw_dump.fadump_enabled || fw_dump.dump_active)\n> \t\treturn -EPERM;\n> \n> +\tif (!count)\n> +\t\treturn -EINVAL;\n\nWhy return an error ? A 0 size write is a valid write, it should return \n0 I think.\n\n> +\n> \tif (count >= COMMAND_LINE_SIZE)\n> \t\treturn -EINVAL;\n>","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=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=Jmd0TAEB;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19824-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=172.105.4.254","lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=Jmd0TAEB;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org\n (client-ip=172.105.4.254; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-0.2 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":3678604,"web_url":"http://patchwork.ozlabs.org/comment/3678604/","msgid":"","date":"2026-04-17T09:30:36","subject":"Re: [PATCH] powerpc/fadump: reject empty bootargs_append writes","submitter":{"id":77202,"url":"http://patchwork.ozlabs.org/api/people/77202/","name":"Sourabh Jain","email":"sourabhjain@linux.ibm.com"},"content":"On 17/04/26 13:09, Pengpeng Hou wrote:\n> bootargs_append_store() indexes params[count - 1] when stripping a\n> trailing newline from the sysfs write buffer.\n>\n> kernfs passes zero-length writes through to the store callback, so an\n> empty write makes that newline check read before the start of params.\n>\n> Reject empty writes before looking at the last input byte.\n>\n> Fixes: 683eab94da75 (\"powerpc/fadump: setup additional parameters for dump capture kernel\")\n> Cc: stable@vger.kernel.org\n>\n> Signed-off-by: Pengpeng Hou \n> ---\n> arch/powerpc/kernel/fadump.c | 3 +++\n> 1 file changed, 3 insertions(+)\n>\n> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c\n> index 4ebc333dd786..03ab5565e420 100644\n> --- a/arch/powerpc/kernel/fadump.c\n> +++ b/arch/powerpc/kernel/fadump.c\n> @@ -1479,6 +1479,9 @@ static ssize_t bootargs_append_store(struct kobject *kobj,\n> \tif (!fw_dump.fadump_enabled || fw_dump.dump_active)\n> \t\treturn -EPERM;\n> \n> +\tif (!count)\n> +\t\treturn -EINVAL;\n\nHow you manage to call this function with count as 0?\n\n> +\n> \tif (count >= COMMAND_LINE_SIZE)\n> \t\treturn -EINVAL;\n>","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=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=e73eTsvI;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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