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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 18 Sep 2019 15:15:18 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x8IEFG6F51511340 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 18 Sep 2019 14:15:17 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 79F3EAE045; Wed, 18 Sep 2019 14:15:15 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3B117AE064; Wed, 18 Sep 2019 14:15:12 +0000 (GMT) Received: from localhost.localdomain (unknown [9.85.196.20]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 18 Sep 2019 14:15:12 +0000 (GMT) Subject: Re: [RFC PATCH v1 1/1] Add support for arm64 to carry ima measurement log in kexec_file_load From: Mimi Zohar To: Prakhar Srivastava , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-integrity@vger.kernel.org, kexec@lists.infradead.org Cc: arnd@arndb.de, jean-philippe@linaro.org, allison@lohutok.net, kristina.martsenko@arm.org, yamada.masahiro@socionext.com, duwe@lst.de, mark.rutland@arm.com, tglx@linutronix.de, takahiro.akashi@linaro.org, james.morse@arm.org, catalin.marinas@arm.com, sboyd@kernel.org, bauerman@linux.ibm.com Date: Wed, 18 Sep 2019 10:15:11 -0400 In-Reply-To: <20190913225009.3406-2-prsriva@linux.microsoft.com> References: <20190913225009.3406-1-prsriva@linux.microsoft.com> <20190913225009.3406-2-prsriva@linux.microsoft.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.20.5 (3.20.5-1.fc24) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19091814-0028-0000-0000-0000039F8474 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19091814-0029-0000-0000-00002461883F Message-Id: <1568816111.16709.68.camel@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-09-18_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909180142 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Prahkar, On Fri, 2019-09-13 at 15:50 -0700, Prakhar Srivastava wrote: > During kexec_file_load, carrying forward the ima measurement log allows > a verifying party to get the entire runtime event log since the last > full reboot since that is when PCRs were last reset. > > Signed-off-by: Prakhar Srivastava Missing is the Changelog between versions.  (v1 has now been posted 3 times.) There's a number of trailing whitespaces, blanks before tabs, and other warnings.  Please use scripts/checkpatch.pl before posting patches. > --- > arch/arm64/Kconfig | 7 + > arch/arm64/include/asm/ima.h | 29 ++++ > arch/arm64/include/asm/kexec.h | 5 + > arch/arm64/kernel/Makefile | 3 +- > arch/arm64/kernel/ima_kexec.c | 213 +++++++++++++++++++++++++ > arch/arm64/kernel/machine_kexec_file.c | 6 + > 6 files changed, 262 insertions(+), 1 deletion(-) > create mode 100644 arch/arm64/include/asm/ima.h > create mode 100644 arch/arm64/kernel/ima_kexec.c > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 3adcec05b1f6..f39b12dbf9e8 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -976,6 +976,13 @@ config KEXEC_VERIFY_SIG > verification for the corresponding kernel image type being > loaded in order for this to work. > > +config HAVE_IMA_KEXEC > + bool "Carry over IMA measurement log during kexec_file_load() syscall" > + depends on KEXEC_FILE > + help > + Select this option to carry over IMA measurement log during > + kexec_file_load. > + > config KEXEC_IMAGE_VERIFY_SIG > bool "Enable Image signature verification support" > default y > diff --git a/arch/arm64/include/asm/ima.h b/arch/arm64/include/asm/ima.h > new file mode 100644 > index 000000000000..e23cee84729f > --- /dev/null > +++ b/arch/arm64/include/asm/ima.h > @@ -0,0 +1,29 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +#ifndef _ASM_ARM64_IMA_H > +#define _ASM_ARM64_IMA_H > + > +struct kimage; > + > +int ima_get_kexec_buffer(void **addr, size_t *size); > +int ima_free_kexec_buffer(void); > + > +#ifdef CONFIG_IMA > +void remove_ima_buffer(void *fdt, int chosen_node); > +#else > +static inline void remove_ima_buffer(void *fdt, int chosen_node) {} > +#endif > + > +#ifdef CONFIG_IMA_KEXEC > +int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr, > + size_t size); > + > +int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node); > +#else > +static inline int setup_ima_buffer(const struct kimage *image, void *fdt, > + int chosen_node) > +{ > + remove_ima_buffer(fdt, chosen_node); > + return 0; > +} > +#endif /* CONFIG_IMA_KEXEC */ > +#endif /* _ASM_ARM64_IMA_H */ > diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h > index 12a561a54128..e8d2412066e7 100644 > --- a/arch/arm64/include/asm/kexec.h > +++ b/arch/arm64/include/asm/kexec.h > @@ -96,6 +96,11 @@ static inline void crash_post_resume(void) {} > struct kimage_arch { > void *dtb; > unsigned long dtb_mem; > + > +#ifdef CONFIG_IMA_KEXEC > + phys_addr_t ima_buffer_addr; > + size_t ima_buffer_size; > +#endif > }; > > extern const struct kexec_file_ops kexec_image_ops; > diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile > index 478491f07b4f..580238f2e9a7 100644 > --- a/arch/arm64/kernel/Makefile > +++ b/arch/arm64/kernel/Makefile > @@ -55,7 +55,8 @@ obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o > obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate-asm.o > obj-$(CONFIG_KEXEC_CORE) += machine_kexec.o relocate_kernel.o \ > cpu-reset.o > -obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o > +obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o \ > + ima_kexec.o The kernel may be built with/without IMA enabled or without IMA_KEXEC support.  Here you're requiring both IMA and IMA_KEXEC to be configured.  Please refer to the powerpc example. > obj-$(CONFIG_ARM64_RELOC_TEST) += arm64-reloc-test.o > arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o > obj-$(CONFIG_CRASH_DUMP) += crash_dump.o > diff --git a/arch/arm64/kernel/ima_kexec.c b/arch/arm64/kernel/ima_kexec.c > new file mode 100644 > index 000000000000..b14326d541f3 > --- /dev/null > +++ b/arch/arm64/kernel/ima_kexec.c > @@ -0,0 +1,213 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2019 Microsoft Corporation. > + * > + * Authors: > + * Prakhar Srivastava > + */ > + > +#include > +#include > +#include > +#include > +#include > + > + Extraneous blank line. > +/** > + * delete_fdt_mem_rsv - delete memory reservation with given address and size > + * @fdt - pointer to the fdt. > + * @start - start address of the memory. > + * @size - number of cells to be deletd. > + * > + * Return: 0 on success, or negative errno on error. > + */ > +int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size) > +{ > + int i, ret, num_rsvs = fdt_num_mem_rsv(fdt); > + > + for (i = 0; i < num_rsvs; i++) { > + uint64_t rsv_start, rsv_size; > + > + ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size); > + if (ret) { > + pr_err("Malformed device tree\n"); > + return -EINVAL; > + } > + > + if (rsv_start == start && rsv_size == size) { > + ret = fdt_del_mem_rsv(fdt, i); > + if (ret) { > + pr_err("Error deleting device tree reservation\n"); > + return -EINVAL; > + } > + > + return 0; > + } > + } > + > + return -ENOENT; > +} > + > +/** > + * remove_ima_buffer - remove the IMA buffer property and reservation > + * @fdt - pointer the fdt. > + * @chosen_node - node under which property can be found. > + * > + * The IMA measurement buffer is either read by now and freeed or a kexec call > + * needs to replace the ima measurement buffer, clear the property and memory > + * reservation. > + */ > +void remove_ima_buffer(void *fdt, int chosen_node) > +{ > + int ret, len; > + const void *prop; > + uint64_t tmp_start, tmp_end; > + > + prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len); > + if (prop) { > + tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop)); > + > + prop = fdt_getprop(fdt, chosen_node, > + "linux,ima-kexec-buffer-end", &len); > + if (!prop) > + return; > + > + tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop)); > + > + ret = delete_fdt_mem_rsv(fdt, tmp_start, tmp_end - tmp_start); > + > + if (ret == 0) > + pr_debug("Removed old IMA buffer reservation.\n"); > + else if (ret != -ENOENT) > + return; > + > + fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer"); > + fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer-end"); > + } > +} > + > +/** > + * ima_get_kexec_buffer - get IMA buffer from the previous kernel > + * @addr: On successful return, set to point to the buffer contents. > + * @size: On successful return, set to the buffer size. > + * > + * Return: 0 on success, negative errno on error. > + */ > +int ima_get_kexec_buffer(void **addr, size_t *size) > +{ > + int len; > + const void *prop; > + uint64_t tmp_start, tmp_end; > + > + prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len); > + if (!prop) > + return -ENOENT; > + > + tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop)); > + > + prop = of_get_property(of_chosen, "linux,ima-kexec-buffer-end", &len); > + if (!prop) > + return -ENOENT; > + > + tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop)); > + > + *addr = __va(tmp_start); > + *size = tmp_end - tmp_start; > + > + return 0; > +} > + > +/** > + * ima_free_kexec_buffer - free memory used by the IMA buffer > + * > + * Return: 0 on success, negative errno on error. > + */ > +int ima_free_kexec_buffer(void) > +{ > + int ret; > + void *propStart, *propEnd; Is there a reason for using mixed case variables?  Why does the variable need to be prefixed with "prop"?  Wouldn't ima_start/_stop,  buffer_start/_stop, or even buf_start/_stop be fine? > + uint64_t tmp_start, tmp_end; > + > + propStart = of_find_property(of_chosen, "linux,ima-kexec-buffer", > + NULL); > + if (propStart) { > + tmp_start = fdt64_to_cpu(*((const fdt64_t *) propStart)); > + ret = of_remove_property(of_chosen, propStart); > + if (!ret) { > + return ret; > + } > + > + propEnd = of_find_property(of_chosen, > + "linux,ima-kexec-buffer-end", NULL); > + if (!propEnd) { > + return -EINVAL; > + } > + > + tmp_end = fdt64_to_cpu(*((const fdt64_t *) propEnd)); > + > + ret = of_remove_property(of_chosen, propEnd); > + if (!ret) { > + return ret; > + } There seems to be quite a bit of code duplication in this function and in ima_get_kexec_buffer().  It could probably be cleaned up with some refactoring. Mimi > + > + return memblock_free(tmp_start, tmp_end - tmp_start); > + } > + return 0; > +} > + > +#ifdef CONFIG_IMA_KEXEC > +/** > + * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA > + * measurement log. > + * @image: - pointer to the kimage, to store the address and size of the > + * IMA measurement log. > + * @load_addr: - the address where the IMA measurement log is stored. > + * @size - size of the IMA measurement log. > + * > + * Return: 0 on success, negative errno on error. > + */ > +int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr, > + size_t size) > +{ > + image->arch.ima_buffer_addr = load_addr; > + image->arch.ima_buffer_size = size; > + return 0; > +} > + > +/** > + * setup_ima_buffer - update the fdt to contain the ima mesasurement log > + * @image: - pointer to the kimage, containing the address and size of > + * the IMA measurement log. > + * @fdt: - pointer to the fdt. > + * @chosen_node: - node under which property is to be defined. > + * > + * Return: 0 on success, negative errno on error. > + */ > +int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node) > +{ > + int ret; > + > + remove_ima_buffer(fdt, chosen_node); > + > + if (!image->arch.ima_buffer_size) > + return 0; > + > + ret = fdt_setprop_u64(fdt, chosen_node, "linux,ima-kexec-buffer", > + image->arch.ima_buffer_addr); > + if (ret < 0) > + return ret; > + > + ret = fdt_setprop_u64(fdt, chosen_node, "linux,ima-kexec-buffer-end", > + image->arch.ima_buffer_addr + > + image->arch.ima_buffer_size); > + if (ret < 0) > + return ret; > + > + ret = fdt_add_mem_rsv(fdt, image->arch.ima_buffer_addr, > + image->arch.ima_buffer_size); > + if (ret < 0) > + return ret; > + > + return 0; > +} > +#endif /* CONFIG_IMA_KEXEC */ > diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c > index 58871333737a..de5452539c67 100644 > --- a/arch/arm64/kernel/machine_kexec_file.c > +++ b/arch/arm64/kernel/machine_kexec_file.c > @@ -21,6 +21,7 @@ > #include > #include > #include > +#include > > /* relevant device tree properties */ > #define FDT_PROP_INITRD_START "linux,initrd-start" > @@ -85,6 +86,11 @@ static int setup_dtb(struct kimage *image, > goto out; > } > > + /* add ima measuremnet log buffer */ > + ret = setup_ima_buffer(image, dtb, off); > + if (ret) > + goto out; > + > /* add kaslr-seed */ > ret = fdt_delprop(dtb, off, FDT_PROP_KASLR_SEED); > if (ret == -FDT_ERR_NOTFOUND)