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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 11 Mar 2020 18:35:48 -0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02BIZlvR42729688 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 11 Mar 2020 18:35:47 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 201334203F; Wed, 11 Mar 2020 18:35:47 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B723C4204F; Wed, 11 Mar 2020 18:35:46 +0000 (GMT) Received: from laptop2-ibm.local (unknown [9.152.212.60]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 11 Mar 2020 18:35:46 +0000 (GMT) Date: Wed, 11 Mar 2020 19:35:45 +0100 From: Philipp Rudo To: Nayna Jain Cc: linux-integrity@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-efi@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org, Ard Biesheuvel , Michael Ellerman , zohar@linux.ibm.com, Thomas Gleixner , linux-kernel@vger.kernel.org, Nayna Jain Subject: Re: [PATCH v3] ima: add a new CONFIG for loading arch-specific policies In-Reply-To: <1583715471-15525-1-git-send-email-nayna@linux.ibm.com> References: <1583715471-15525-1-git-send-email-nayna@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20031118-0028-0000-0000-000003E33C88 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20031118-0029-0000-0000-000024A881D7 Message-Id: <20200311193545.2f0e5ea3@laptop2-ibm.local> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-03-11_09:2020-03-11,2020-03-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxlogscore=999 bulkscore=0 mlxscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 spamscore=0 clxscore=1015 adultscore=0 suspectscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003110105 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 8 Mar 2020 20:57:51 -0400 Nayna Jain wrote: > From: Nayna Jain > > Every time a new architecture defines the IMA architecture specific > functions - arch_ima_get_secureboot() and arch_ima_get_policy(), the IMA > include file needs to be updated. To avoid this "noise", this patch > defines a new IMA Kconfig IMA_SECURE_AND_OR_TRUSTED_BOOT option, allowing > the different architectures to select it. > > Suggested-by: Linus Torvalds > Signed-off-by: Nayna Jain > Acked-by: Ard Biesheuvel > Cc: Ard Biesheuvel > Cc: Philipp Rudo > Cc: Michael Ellerman > --- > v3: > * Removes CONFIG_IMA dependency. Thanks Ard. > * Updated the patch with improvements suggested by Michael. It now uses > "imply" instead of "select". Thanks Michael. > * Replaced the CONFIG_IMA in x86 and s390 with new config, else it was > resulting in redefinition when the IMA_SECURE_AND_OR_TRUSTED_BOOT > is not enabled. Thanks to Mimi for identifying the problem. > * Removed "#ifdef EFI" check in the arch/x86/Makefile for compiling > ima_arch.c file. > * Ard, Thanks for your Acked-by. I have changed the arch/x86/Makefile in > this version. Can you please review again and confirm ? > * Rudo, Thanks for your review. I have changed arch/s390/Makefile as well. > Can you also please review again ? Looks good to me for the s390 part Acked-by: Philipp Rudo Thanks Philipp > > v2: > * Fixed the issue identified by Mimi. Thanks Mimi, Ard, Heiko and Michael for > discussing the fix. > > arch/powerpc/Kconfig | 1 + > arch/s390/Kconfig | 1 + > arch/s390/kernel/Makefile | 2 +- > arch/x86/Kconfig | 1 + > arch/x86/kernel/Makefile | 4 +--- > include/linux/ima.h | 3 +-- > security/integrity/ima/Kconfig | 7 +++++++ > 7 files changed, 13 insertions(+), 6 deletions(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 497b7d0b2d7e..5b9f1cba2a44 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -979,6 +979,7 @@ config PPC_SECURE_BOOT > bool > depends on PPC_POWERNV > depends on IMA_ARCH_POLICY > + imply IMA_SECURE_AND_OR_TRUSTED_BOOT > help > Systems with firmware secure boot enabled need to define security > policies to extend secure boot to the OS. This config allows a user > diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig > index 8abe77536d9d..59c216af6264 100644 > --- a/arch/s390/Kconfig > +++ b/arch/s390/Kconfig > @@ -195,6 +195,7 @@ config S390 > select ARCH_HAS_FORCE_DMA_UNENCRYPTED > select SWIOTLB > select GENERIC_ALLOCATOR > + imply IMA_SECURE_AND_OR_TRUSTED_BOOT > > > config SCHED_OMIT_FRAME_POINTER > diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile > index 2b1203cf7be6..578a6fa82ea4 100644 > --- a/arch/s390/kernel/Makefile > +++ b/arch/s390/kernel/Makefile > @@ -70,7 +70,7 @@ obj-$(CONFIG_JUMP_LABEL) += jump_label.o > obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o > obj-$(CONFIG_KEXEC_FILE) += kexec_elf.o > > -obj-$(CONFIG_IMA) += ima_arch.o > +obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT) += ima_arch.o > > obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf_common.o > obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf.o perf_cpum_sf.o > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index beea77046f9b..dcf5b1729f7c 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -230,6 +230,7 @@ config X86 > select VIRT_TO_BUS > select X86_FEATURE_NAMES if PROC_FS > select PROC_PID_ARCH_STATUS if PROC_FS > + imply IMA_SECURE_AND_OR_TRUSTED_BOOT if EFI > > config INSTRUCTION_DECODER > def_bool y > diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile > index 9b294c13809a..cfef37a27def 100644 > --- a/arch/x86/kernel/Makefile > +++ b/arch/x86/kernel/Makefile > @@ -154,6 +154,4 @@ ifeq ($(CONFIG_X86_64),y) > obj-y += vsmp_64.o > endif > > -ifdef CONFIG_EFI > -obj-$(CONFIG_IMA) += ima_arch.o > -endif > +obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT) += ima_arch.o > diff --git a/include/linux/ima.h b/include/linux/ima.h > index 1659217e9b60..aefe758f4466 100644 > --- a/include/linux/ima.h > +++ b/include/linux/ima.h > @@ -30,8 +30,7 @@ extern void ima_kexec_cmdline(const void *buf, int size); > extern void ima_add_kexec_buffer(struct kimage *image); > #endif > > -#if (defined(CONFIG_X86) && defined(CONFIG_EFI)) || defined(CONFIG_S390) \ > - || defined(CONFIG_PPC_SECURE_BOOT) > +#ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT > extern bool arch_ima_get_secureboot(void); > extern const char * const *arch_get_ima_policy(void); > #else > diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig > index 3f3ee4e2eb0d..edde88dbe576 100644 > --- a/security/integrity/ima/Kconfig > +++ b/security/integrity/ima/Kconfig > @@ -327,3 +327,10 @@ config IMA_QUEUE_EARLY_BOOT_KEYS > depends on IMA_MEASURE_ASYMMETRIC_KEYS > depends on SYSTEM_TRUSTED_KEYRING > default y > + > +config IMA_SECURE_AND_OR_TRUSTED_BOOT > + bool > + depends on IMA_ARCH_POLICY > + help > + This option is selected by architectures to enable secure and/or > + trusted boot based on IMA runtime policies.