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* [PATCH v12 05/16] kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, james.morse, bhsharma, kexec, linux-arm-kernel,
	linux-kernel, AKASHI Takahiro
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

In kdump case, there exists only one dedicated memblock region as usable
memory (crashk_res). With this patch, kexec_walk_memblock() runs a given
callback function on this region.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 kernel/kexec_file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 2f0691b0f8ad..bb23f9280a7a 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -511,6 +511,9 @@ static int kexec_walk_memblock(struct kexec_buf *kbuf,
 	phys_addr_t mstart, mend;
 	struct resource res = { };
 
+	if (kbuf->image->type == KEXEC_TYPE_CRASH)
+		return func(&crashk_res, kbuf);
+
 	if (kbuf->top_down) {
 		for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
 						&mstart, &mend, NULL) {
-- 
2.18.0


^ permalink raw reply related

* [PATCH v12 12/16] arm64: kexec_file: add crash dump support
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Enabling crash dump (kdump) includes
* prepare contents of ELF header of a core dump file, /proc/vmcore,
  using crash_prepare_elf64_headers(), and
* add two device tree properties, "linux,usable-memory-range" and
  "linux,elfcorehdr", which represent respectively a memory range
  to be used by crash dump kernel and the header's location

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
---
 arch/arm64/include/asm/kexec.h         |   6 +-
 arch/arm64/kernel/machine_kexec_file.c | 113 ++++++++++++++++++++++++-
 2 files changed, 115 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
index 5d102a1054b3..1b2c27026ae0 100644
--- a/arch/arm64/include/asm/kexec.h
+++ b/arch/arm64/include/asm/kexec.h
@@ -97,8 +97,12 @@ static inline void crash_post_resume(void) {}
 #define ARCH_HAS_KIMAGE_ARCH
 
 struct kimage_arch {
-	void *dtb_buf;
+	void *dtb;
 	unsigned long dtb_mem;
+	/* Core ELF header buffer */
+	void *elf_headers;
+	unsigned long elf_headers_mem;
+	unsigned long elf_headers_sz;
 };
 
 /**
diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index b8297f10e2ef..7356da5a53d5 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -16,7 +16,9 @@
 #include <linux/libfdt.h>
 #include <linux/memblock.h>
 #include <linux/of_fdt.h>
+#include <linux/slab.h>
 #include <linux/types.h>
+#include <linux/vmalloc.h>
 #include <asm/byteorder.h>
 
 const struct kexec_file_ops * const kexec_file_loaders[] = {
@@ -29,6 +31,10 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	vfree(image->arch.dtb);
 	image->arch.dtb = NULL;
 
+	vfree(image->arch.elf_headers);
+	image->arch.elf_headers = NULL;
+	image->arch.elf_headers_sz = 0;
+
 	return kexec_image_post_load_cleanup_default(image);
 }
 
@@ -38,12 +44,30 @@ static int setup_dtb(struct kimage *image,
 		void **dtb_buf, unsigned long *dtb_buf_len)
 {
 	void *buf = NULL;
-	size_t buf_size;
+	size_t buf_size, range_size;
 	int nodeoffset;
 	int ret;
 
+	/* check ranges against root's #address-cells and #size-cells */
+	if (image->type == KEXEC_TYPE_CRASH &&
+		(!of_fdt_cells_size_fitted(image->arch.elf_headers_mem,
+				image->arch.elf_headers_sz) ||
+		 !of_fdt_cells_size_fitted(crashk_res.start,
+				crashk_res.end - crashk_res.start + 1))) {
+		pr_err("Crash memory region doesn't fit into DT's root cell sizes.\n");
+		ret = -EINVAL;
+		goto out_err;
+	}
+
 	/* duplicate dt blob */
 	buf_size = fdt_totalsize(initial_boot_params);
+	range_size = of_fdt_reg_cells_size();
+
+	if (image->type == KEXEC_TYPE_CRASH) {
+		buf_size += fdt_prop_len("linux,elfcorehdr", range_size);
+		buf_size += fdt_prop_len("linux,usable-memory-range",
+								range_size);
+	}
 
 	if (initrd_load_addr) {
 		/* can be redundant, but trimmed at the end */
@@ -73,6 +97,23 @@ static int setup_dtb(struct kimage *image,
 		goto out_err;
 	}
 
+	if (image->type == KEXEC_TYPE_CRASH) {
+		/* add linux,elfcorehdr */
+		ret = fdt_setprop_reg(buf, nodeoffset, "linux,elfcorehdr",
+				image->arch.elf_headers_mem,
+				image->arch.elf_headers_sz);
+		if (ret)
+			goto out_err;
+
+		/* add linux,usable-memory-range */
+		ret = fdt_setprop_reg(buf, nodeoffset,
+				"linux,usable-memory-range",
+				crashk_res.start,
+				crashk_res.end - crashk_res.start + 1);
+		if (ret)
+			goto out_err;
+	}
+
 	/* add bootargs */
 	if (cmdline) {
 		ret = fdt_setprop_string(buf, nodeoffset, "bootargs", cmdline);
@@ -129,6 +170,43 @@ static int setup_dtb(struct kimage *image,
 	return ret;
 }
 
+static int prepare_elf_headers(void **addr, unsigned long *sz)
+{
+	struct crash_mem *cmem;
+	unsigned int nr_ranges;
+	int ret;
+	u64 i;
+	phys_addr_t start, end;
+
+	nr_ranges = 1; /* for exclusion of crashkernel region */
+	for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, 0,
+							&start, &end, NULL)
+		nr_ranges++;
+
+	cmem = kmalloc(sizeof(struct crash_mem) +
+			sizeof(struct crash_mem_range) * nr_ranges, GFP_KERNEL);
+	if (!cmem)
+		return -ENOMEM;
+
+	cmem->max_nr_ranges = nr_ranges;
+	cmem->nr_ranges = 0;
+	for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE,
+					MEMBLOCK_NONE, &start, &end, NULL) {
+		cmem->ranges[cmem->nr_ranges].start = start;
+		cmem->ranges[cmem->nr_ranges].end = end - 1;
+		cmem->nr_ranges++;
+	}
+
+	/* Exclude crashkernel region */
+	ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
+
+	if (!ret)
+		ret =  crash_prepare_elf64_headers(cmem, true, addr, sz);
+
+	kfree(cmem);
+	return ret;
+}
+
 int load_other_segments(struct kimage *image,
 			unsigned long kernel_load_addr,
 			unsigned long kernel_size,
@@ -136,14 +214,43 @@ int load_other_segments(struct kimage *image,
 			char *cmdline, unsigned long cmdline_len)
 {
 	struct kexec_buf kbuf;
-	void *dtb = NULL;
-	unsigned long initrd_load_addr = 0, dtb_len;
+	void *headers, *dtb = NULL;
+	unsigned long headers_sz, initrd_load_addr = 0, dtb_len;
 	int ret = 0;
 
 	kbuf.image = image;
 	/* not allocate anything below the kernel */
 	kbuf.buf_min = kernel_load_addr + kernel_size;
 
+	/* load elf core header */
+	if (image->type == KEXEC_TYPE_CRASH) {
+		ret = prepare_elf_headers(&headers, &headers_sz);
+		if (ret) {
+			pr_err("Preparing elf core header failed\n");
+			goto out_err;
+		}
+
+		kbuf.buffer = headers;
+		kbuf.bufsz = headers_sz;
+		kbuf.mem = 0;
+		kbuf.memsz = headers_sz;
+		kbuf.buf_align = SZ_64K; /* largest supported page size */
+		kbuf.buf_max = ULONG_MAX;
+		kbuf.top_down = true;
+
+		ret = kexec_add_buffer(&kbuf);
+		if (ret) {
+			vfree(headers);
+			goto out_err;
+		}
+		image->arch.elf_headers = headers;
+		image->arch.elf_headers_mem = kbuf.mem;
+		image->arch.elf_headers_sz = headers_sz;
+
+		pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+			 image->arch.elf_headers_mem, headers_sz, headers_sz);
+	}
+
 	/* load initrd */
 	if (initrd) {
 		kbuf.buffer = initrd;
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 11/16] arm64: kexec_file: allow for loading Image-format kernel
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

This patch provides kexec_file_ops for "Image"-format kernel. In this
implementation, a binary is always loaded with a fixed offset identified
in text_offset field of its header.

Regarding signature verification for trusted boot, this patch doesn't
contains CONFIG_KEXEC_VERIFY_SIG support, which is to be added later
in this series, but file-attribute-based verification is still a viable
option by enabling IMA security subsystem.

You can sign(label) a to-be-kexec'ed kernel image on target file system
with:
    $ evmctl ima_sign --key /path/to/private_key.pem Image

On live system, you must have IMA enforced with, at least, the following
security policy:
    "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig"

See more details about IMA here:
    https://sourceforge.net/p/linux-ima/wiki/Home/

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
---
 arch/arm64/include/asm/kexec.h         |  28 +++++++
 arch/arm64/kernel/Makefile             |   2 +-
 arch/arm64/kernel/kexec_image.c        | 108 +++++++++++++++++++++++++
 arch/arm64/kernel/machine_kexec_file.c |   1 +
 4 files changed, 138 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/kernel/kexec_image.c

diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
index 026f7e408f0c..5d102a1054b3 100644
--- a/arch/arm64/include/asm/kexec.h
+++ b/arch/arm64/include/asm/kexec.h
@@ -101,6 +101,34 @@ struct kimage_arch {
 	unsigned long dtb_mem;
 };
 
+/**
+ * struct arm64_image_header - arm64 kernel image header
+ * See Documentation/arm64/booting.txt for details
+ *
+ * @mz_magic: DOS header magic number ('MZ', optional)
+ * @code1: Instruction (branch to stext)
+ * @text_offset: Image load offset
+ * @image_size: Effective image size
+ * @flags: Bit-field flags
+ * @reserved: Reserved
+ * @magic: Magic number
+ * @pe_header: Offset to PE COFF header (optional)
+ **/
+
+struct arm64_image_header {
+	__le16 mz_magic; /* also code0 */
+	__le16 pad;
+	__le32 code1;
+	__le64 text_offset;
+	__le64 image_size;
+	__le64 flags;
+	__le64 reserved[3];
+	__le32 magic;
+	__le32 pe_header;
+};
+
+extern const struct kexec_file_ops kexec_image_ops;
+
 struct kimage;
 
 extern int arch_kimage_file_post_load_cleanup(struct kimage *image);
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 06281e1ad7ed..a9cc7752f276 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -50,7 +50,7 @@ arm64-obj-$(CONFIG_RANDOMIZE_BASE)	+= kaslr.o
 arm64-obj-$(CONFIG_HIBERNATION)		+= hibernate.o hibernate-asm.o
 arm64-obj-$(CONFIG_KEXEC_CORE)		+= machine_kexec.o relocate_kernel.o	\
 					   cpu-reset.o
-arm64-obj-$(CONFIG_KEXEC_FILE)		+= machine_kexec_file.o
+arm64-obj-$(CONFIG_KEXEC_FILE)		+= machine_kexec_file.o kexec_image.o
 arm64-obj-$(CONFIG_ARM64_RELOC_TEST)	+= arm64-reloc-test.o
 arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
 arm64-obj-$(CONFIG_CRASH_DUMP)		+= crash_dump.o
diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
new file mode 100644
index 000000000000..d64f5e9f9d22
--- /dev/null
+++ b/arch/arm64/kernel/kexec_image.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Kexec image loader
+
+ * Copyright (C) 2018 Linaro Limited
+ * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
+ */
+
+#define pr_fmt(fmt)	"kexec_file(Image): " fmt
+
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/string.h>
+#include <asm/boot.h>
+#include <asm/byteorder.h>
+#include <asm/cpufeature.h>
+#include <asm/memory.h>
+
+static int image_probe(const char *kernel_buf, unsigned long kernel_len)
+{
+	const struct arm64_image_header *h;
+
+	h = (const struct arm64_image_header *)(kernel_buf);
+
+	if (!h || (kernel_len < sizeof(*h)) ||
+			memcmp(&h->magic, ARM64_MAGIC, sizeof(h->magic)))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void *image_load(struct kimage *image,
+				char *kernel, unsigned long kernel_len,
+				char *initrd, unsigned long initrd_len,
+				char *cmdline, unsigned long cmdline_len)
+{
+	struct arm64_image_header *h;
+	u64 flags, value;
+	struct kexec_buf kbuf;
+	unsigned long text_offset;
+	struct kexec_segment *kernel_segment;
+	int ret;
+
+	/* Don't support old kernel */
+	h = (struct arm64_image_header *)kernel;
+	if (!h->text_offset)
+		return ERR_PTR(-EINVAL);
+
+	/* Check cpu features */
+	flags = le64_to_cpu(h->flags);
+	value = head_flag_field(flags, HEAD_FLAG_BE);
+	if (((value == HEAD_FLAG_BE) && !IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) ||
+	    ((value != HEAD_FLAG_BE) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)))
+		if (!system_supports_mixed_endian())
+			return ERR_PTR(-EINVAL);
+
+	value = head_flag_field(flags, HEAD_FLAG_PAGE_SIZE);
+	if (((value == HEAD_FLAG_PAGE_SIZE_4K) &&
+			!system_supports_4kb_granule()) ||
+	    ((value == HEAD_FLAG_PAGE_SIZE_64K) &&
+			!system_supports_64kb_granule()) ||
+	    ((value == HEAD_FLAG_PAGE_SIZE_16K) &&
+			!system_supports_16kb_granule()))
+		return ERR_PTR(-EINVAL);
+
+	/* Load the kernel */
+	kbuf.image = image;
+	kbuf.buf_min = 0;
+	kbuf.buf_max = ULONG_MAX;
+	kbuf.top_down = false;
+
+	kbuf.buffer = kernel;
+	kbuf.bufsz = kernel_len;
+	kbuf.mem = 0;
+	kbuf.memsz = le64_to_cpu(h->image_size);
+	text_offset = le64_to_cpu(h->text_offset);
+	kbuf.buf_align = MIN_KIMG_ALIGN;
+
+	/* Adjust kernel segment with TEXT_OFFSET */
+	kbuf.memsz += text_offset;
+
+	ret = kexec_add_buffer(&kbuf);
+	if (ret)
+		return ERR_PTR(ret);
+
+	kernel_segment = &image->segment[image->nr_segments - 1];
+	kernel_segment->mem += text_offset;
+	kernel_segment->memsz -= text_offset;
+	image->start = kernel_segment->mem;
+
+	pr_debug("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+				kernel_segment->mem, kbuf.bufsz,
+				kernel_segment->memsz);
+
+	/* Load additional data */
+	ret = load_other_segments(image,
+				kernel_segment->mem, kernel_segment->memsz,
+				initrd, initrd_len, cmdline, cmdline_len);
+
+	return ERR_PTR(ret);
+}
+
+const struct kexec_file_ops kexec_image_ops = {
+	.probe = image_probe,
+	.load = image_load,
+};
diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index b28fbb0659c9..b8297f10e2ef 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -20,6 +20,7 @@
 #include <asm/byteorder.h>
 
 const struct kexec_file_ops * const kexec_file_loaders[] = {
+	&kexec_image_ops,
 	NULL
 };
 
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 10/16] arm64: kexec_file: load initrd and device-tree
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

load_other_segments() is expected to allocate and place all the necessary
memory segments other than kernel, including initrd and device-tree
blob (and elf core header for crash).
While most of the code was borrowed from kexec-tools' counterpart,
users may not be allowed to specify dtb explicitly, instead, the dtb
presented by the original boot loader is reused.

arch_kimage_kernel_post_load_cleanup() is responsible for freeing arm64-
specific data allocated in load_other_segments().

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
---
 arch/arm64/include/asm/kexec.h         |  17 +++
 arch/arm64/kernel/machine_kexec_file.c | 182 +++++++++++++++++++++++++
 2 files changed, 199 insertions(+)

diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
index e17f0529a882..026f7e408f0c 100644
--- a/arch/arm64/include/asm/kexec.h
+++ b/arch/arm64/include/asm/kexec.h
@@ -93,6 +93,23 @@ static inline void crash_prepare_suspend(void) {}
 static inline void crash_post_resume(void) {}
 #endif
 
+#ifdef CONFIG_KEXEC_FILE
+#define ARCH_HAS_KIMAGE_ARCH
+
+struct kimage_arch {
+	void *dtb_buf;
+	unsigned long dtb_mem;
+};
+
+struct kimage;
+
+extern int arch_kimage_file_post_load_cleanup(struct kimage *image);
+extern int load_other_segments(struct kimage *image,
+		unsigned long kernel_load_addr, unsigned long kernel_size,
+		char *initrd, unsigned long initrd_len,
+		char *cmdline, unsigned long cmdline_len);
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif
diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index c38a8048ed00..b28fbb0659c9 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -5,12 +5,194 @@
  * Copyright (C) 2018 Linaro Limited
  * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
  *
+ * Most code is derived from arm64 port of kexec-tools
  */
 
 #define pr_fmt(fmt) "kexec_file: " fmt
 
+#include <linux/ioport.h>
+#include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/libfdt.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+#include <linux/types.h>
+#include <asm/byteorder.h>
 
 const struct kexec_file_ops * const kexec_file_loaders[] = {
 	NULL
 };
+
+int arch_kimage_file_post_load_cleanup(struct kimage *image)
+{
+	vfree(image->arch.dtb);
+	image->arch.dtb = NULL;
+
+	return kexec_image_post_load_cleanup_default(image);
+}
+
+static int setup_dtb(struct kimage *image,
+		unsigned long initrd_load_addr, unsigned long initrd_len,
+		char *cmdline, unsigned long cmdline_len,
+		void **dtb_buf, unsigned long *dtb_buf_len)
+{
+	void *buf = NULL;
+	size_t buf_size;
+	int nodeoffset;
+	int ret;
+
+	/* duplicate dt blob */
+	buf_size = fdt_totalsize(initial_boot_params);
+
+	if (initrd_load_addr) {
+		/* can be redundant, but trimmed at the end */
+		buf_size += fdt_prop_len("linux,initrd-start", sizeof(u64));
+		buf_size += fdt_prop_len("linux,initrd-end", sizeof(u64));
+	}
+
+	if (cmdline)
+		/* can be redundant, but trimmed at the end */
+		buf_size += fdt_prop_len("bootargs", cmdline_len);
+
+	buf = vmalloc(buf_size);
+	if (!buf) {
+		ret = -ENOMEM;
+		goto out_err;
+	}
+
+	ret = fdt_open_into(initial_boot_params, buf, buf_size);
+	if (ret) {
+		ret = -EINVAL;
+		goto out_err;
+	}
+
+	nodeoffset = fdt_path_offset(buf, "/chosen");
+	if (nodeoffset < 0) {
+		ret = -EINVAL;
+		goto out_err;
+	}
+
+	/* add bootargs */
+	if (cmdline) {
+		ret = fdt_setprop_string(buf, nodeoffset, "bootargs", cmdline);
+		if (ret) {
+			ret = -EINVAL;
+			goto out_err;
+		}
+	} else {
+		ret = fdt_delprop(buf, nodeoffset, "bootargs");
+		if (ret && (ret != -FDT_ERR_NOTFOUND)) {
+			ret = -EINVAL;
+			goto out_err;
+		}
+	}
+
+	/* add initrd-* */
+	if (initrd_load_addr) {
+		ret = fdt_setprop_u64(buf, nodeoffset, "linux,initrd-start",
+							initrd_load_addr);
+		if (ret) {
+			ret = -EINVAL;
+			goto out_err;
+		}
+
+		ret = fdt_setprop_u64(buf, nodeoffset, "linux,initrd-end",
+						initrd_load_addr + initrd_len);
+		if (ret) {
+			ret = -EINVAL;
+			goto out_err;
+		}
+	} else {
+		ret = fdt_delprop(buf, nodeoffset, "linux,initrd-start");
+		if (ret && (ret != -FDT_ERR_NOTFOUND)) {
+			ret = -EINVAL;
+			goto out_err;
+		}
+
+		ret = fdt_delprop(buf, nodeoffset, "linux,initrd-end");
+		if (ret && (ret != -FDT_ERR_NOTFOUND)) {
+			ret = -EINVAL;
+			goto out_err;
+		}
+	}
+
+	/* trim a buffer */
+	fdt_pack(buf);
+	*dtb_buf = buf;
+	*dtb_buf_len = fdt_totalsize(buf);
+
+	return 0;
+
+out_err:
+	vfree(buf);
+	return ret;
+}
+
+int load_other_segments(struct kimage *image,
+			unsigned long kernel_load_addr,
+			unsigned long kernel_size,
+			char *initrd, unsigned long initrd_len,
+			char *cmdline, unsigned long cmdline_len)
+{
+	struct kexec_buf kbuf;
+	void *dtb = NULL;
+	unsigned long initrd_load_addr = 0, dtb_len;
+	int ret = 0;
+
+	kbuf.image = image;
+	/* not allocate anything below the kernel */
+	kbuf.buf_min = kernel_load_addr + kernel_size;
+
+	/* load initrd */
+	if (initrd) {
+		kbuf.buffer = initrd;
+		kbuf.bufsz = initrd_len;
+		kbuf.mem = 0;
+		kbuf.memsz = initrd_len;
+		kbuf.buf_align = 0;
+		/* within 1GB-aligned window of up to 32GB in size */
+		kbuf.buf_max = round_down(kernel_load_addr, SZ_1G)
+						+ (unsigned long)SZ_1G * 32;
+		kbuf.top_down = false;
+
+		ret = kexec_add_buffer(&kbuf);
+		if (ret)
+			goto out_err;
+		initrd_load_addr = kbuf.mem;
+
+		pr_debug("Loaded initrd@0x%lx bufsz=0x%lx memsz=0x%lx\n",
+				initrd_load_addr, initrd_len, initrd_len);
+	}
+
+	/* load dtb blob */
+	ret = setup_dtb(image, initrd_load_addr, initrd_len,
+				cmdline, cmdline_len, &dtb, &dtb_len);
+	if (ret) {
+		pr_err("Preparing for new dtb failed\n");
+		goto out_err;
+	}
+
+	kbuf.buffer = dtb;
+	kbuf.bufsz = dtb_len;
+	kbuf.mem = 0;
+	kbuf.memsz = dtb_len;
+	/* not across 2MB boundary */
+	kbuf.buf_align = SZ_2M;
+	kbuf.buf_max = ULONG_MAX;
+	kbuf.top_down = true;
+
+	ret = kexec_add_buffer(&kbuf);
+	if (ret)
+		goto out_err;
+	image->arch.dtb = dtb;
+	image->arch.dtb_mem = kbuf.mem;
+
+	pr_debug("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+			kbuf.mem, dtb_len, dtb_len);
+
+	return 0;
+
+out_err:
+	vfree(dtb);
+	return ret;
+}
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 09/16] arm64: enable KEXEC_FILE config
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Modify arm64/Kconfig to enable kexec_file_load support.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: James Morse <james.morse@arm.com>
---
 arch/arm64/Kconfig                     |  9 +++++++++
 arch/arm64/kernel/Makefile             |  3 ++-
 arch/arm64/kernel/machine_kexec_file.c | 16 ++++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/kernel/machine_kexec_file.c

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 42c090cf0292..a9a3a5583c8b 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -835,6 +835,15 @@ config KEXEC
 	  but it is independent of the system firmware.   And like a reboot
 	  you can start any kernel with it, not just Linux.
 
+config KEXEC_FILE
+	bool "kexec file based system call"
+	select KEXEC_CORE
+	help
+	  This is new version of kexec system call. This system call is
+	  file based and takes file descriptors as system call argument
+	  for kernel and initramfs as opposed to list of segments as
+	  accepted by previous system call.
+
 config CRASH_DUMP
 	bool "Build kdump crash kernel"
 	help
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 0025f8691046..06281e1ad7ed 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -48,8 +48,9 @@ arm64-obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL)	+= acpi_parking_protocol.o
 arm64-obj-$(CONFIG_PARAVIRT)		+= paravirt.o
 arm64-obj-$(CONFIG_RANDOMIZE_BASE)	+= kaslr.o
 arm64-obj-$(CONFIG_HIBERNATION)		+= hibernate.o hibernate-asm.o
-arm64-obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o	\
+arm64-obj-$(CONFIG_KEXEC_CORE)		+= machine_kexec.o relocate_kernel.o	\
 					   cpu-reset.o
+arm64-obj-$(CONFIG_KEXEC_FILE)		+= machine_kexec_file.o
 arm64-obj-$(CONFIG_ARM64_RELOC_TEST)	+= arm64-reloc-test.o
 arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
 arm64-obj-$(CONFIG_CRASH_DUMP)		+= crash_dump.o
diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
new file mode 100644
index 000000000000..c38a8048ed00
--- /dev/null
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * kexec_file for arm64
+ *
+ * Copyright (C) 2018 Linaro Limited
+ * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
+ *
+ */
+
+#define pr_fmt(fmt) "kexec_file: " fmt
+
+#include <linux/kexec.h>
+
+const struct kexec_file_ops * const kexec_file_loaders[] = {
+	NULL
+};
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 08/16] arm64: cpufeature: add MMFR0 helper functions
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Those helper functions for MMFR0 register will be used later by kexec_file
loader.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
---
 arch/arm64/include/asm/cpufeature.h | 48 +++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 1717ba1db35d..cd90b5252d6d 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -486,11 +486,59 @@ static inline bool system_supports_32bit_el0(void)
 	return cpus_have_const_cap(ARM64_HAS_32BIT_EL0);
 }
 
+static inline bool system_supports_4kb_granule(void)
+{
+	u64 mmfr0;
+	u32 val;
+
+	mmfr0 =	read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	val = cpuid_feature_extract_unsigned_field(mmfr0,
+						ID_AA64MMFR0_TGRAN4_SHIFT);
+
+	return val == ID_AA64MMFR0_TGRAN4_SUPPORTED;
+}
+
+static inline bool system_supports_64kb_granule(void)
+{
+	u64 mmfr0;
+	u32 val;
+
+	mmfr0 =	read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	val = cpuid_feature_extract_unsigned_field(mmfr0,
+						ID_AA64MMFR0_TGRAN64_SHIFT);
+
+	return val == ID_AA64MMFR0_TGRAN64_SUPPORTED;
+}
+
+static inline bool system_supports_16kb_granule(void)
+{
+	u64 mmfr0;
+	u32 val;
+
+	mmfr0 =	read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	val = cpuid_feature_extract_unsigned_field(mmfr0,
+						ID_AA64MMFR0_TGRAN16_SHIFT);
+
+	return val == ID_AA64MMFR0_TGRAN16_SUPPORTED;
+}
+
 static inline bool system_supports_mixed_endian_el0(void)
 {
 	return id_aa64mmfr0_mixed_endian_el0(read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1));
 }
 
+static inline bool system_supports_mixed_endian(void)
+{
+	u64 mmfr0;
+	u32 val;
+
+	mmfr0 =	read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	val = cpuid_feature_extract_unsigned_field(mmfr0,
+						ID_AA64MMFR0_BIGENDEL_SHIFT);
+
+	return val == 0x1;
+}
+
 static inline bool system_supports_fpsimd(void)
 {
 	return !cpus_have_const_cap(ARM64_HAS_NO_FPSIMD);
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 07/16] arm64: add image head flag definitions
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Those image head's flags will be used later by kexec_file loader.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: James Morse <james.morse@arm.com>
---
 arch/arm64/include/asm/boot.h | 15 +++++++++++++++
 arch/arm64/kernel/head.S      |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/boot.h b/arch/arm64/include/asm/boot.h
index 355e552a9175..0bab7eed3012 100644
--- a/arch/arm64/include/asm/boot.h
+++ b/arch/arm64/include/asm/boot.h
@@ -5,6 +5,21 @@
 
 #include <asm/sizes.h>
 
+#define ARM64_MAGIC		"ARM\x64"
+
+#define HEAD_FLAG_BE_SHIFT		0
+#define HEAD_FLAG_PAGE_SIZE_SHIFT	1
+#define HEAD_FLAG_BE_MASK		0x1
+#define HEAD_FLAG_PAGE_SIZE_MASK	0x3
+
+#define HEAD_FLAG_BE			1
+#define HEAD_FLAG_PAGE_SIZE_4K		1
+#define HEAD_FLAG_PAGE_SIZE_16K		2
+#define HEAD_FLAG_PAGE_SIZE_64K		3
+
+#define head_flag_field(flags, field) \
+		(((flags) >> field##_SHIFT) & field##_MASK)
+
 /*
  * arm64 requires the DTB to be 8 byte aligned and
  * not exceed 2MB in size.
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index b0853069702f..8cbac6232ed1 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -91,7 +91,7 @@ _head:
 	.quad	0				// reserved
 	.quad	0				// reserved
 	.quad	0				// reserved
-	.ascii	"ARM\x64"			// Magic number
+	.ascii	ARM64_MAGIC			// Magic number
 #ifdef CONFIG_EFI
 	.long	pe_header - _head		// Offset to the PE header.
 
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 06/16] of/fdt: add helper functions for handling properties
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

These functions will be used later to handle kexec-specific properties
in arm64's kexec_file implementation.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
---
 drivers/of/fdt.c       | 62 ++++++++++++++++++++++++++++++++++++++++--
 include/linux/of_fdt.h | 10 +++++--
 2 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 6da20b9688f7..f7c9d69ce86c 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -25,6 +25,7 @@
 #include <linux/debugfs.h>
 #include <linux/serial_core.h>
 #include <linux/sysfs.h>
+#include <linux/types.h>
 
 #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
 #include <asm/page.h>
@@ -537,8 +538,8 @@ void *of_fdt_unflatten_tree(const unsigned long *blob,
 EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
 
 /* Everything below here references initial_boot_params directly. */
-int __initdata dt_root_addr_cells;
-int __initdata dt_root_size_cells;
+int dt_root_addr_cells;
+int dt_root_size_cells;
 
 void *initial_boot_params;
 
@@ -1330,3 +1331,60 @@ late_initcall(of_fdt_raw_init);
 #endif
 
 #endif /* CONFIG_OF_EARLY_FLATTREE */
+
+bool of_fdt_cells_size_fitted(u64 base, u64 size)
+{
+	/* if *_cells >= 2, cells can hold 64-bit values anyway */
+	if ((dt_root_addr_cells == 1) && (base > U32_MAX))
+		return false;
+
+	if ((dt_root_size_cells == 1) && (size > U32_MAX))
+		return false;
+
+	return true;
+}
+
+size_t of_fdt_reg_cells_size(void)
+{
+	return (dt_root_addr_cells + dt_root_size_cells) * sizeof(u32);
+}
+
+#define FDT_ALIGN(x, a)	(((x) + (a) - 1) & ~((a) - 1))
+#define FDT_TAGALIGN(x)	(FDT_ALIGN((x), FDT_TAGSIZE))
+
+int fdt_prop_len(const char *prop_name, int len)
+{
+	return (strlen(prop_name) + 1) +
+		sizeof(struct fdt_property) +
+		FDT_TAGALIGN(len);
+}
+
+static void fill_property(void *buf, u64 val64, int cells)
+{
+	__be32 val32;
+
+	while (cells) {
+		val32 = cpu_to_fdt32((val64 >> (32 * (--cells))) & U32_MAX);
+		memcpy(buf, &val32, sizeof(val32));
+		buf += sizeof(val32);
+	}
+}
+
+int fdt_setprop_reg(void *fdt, int nodeoffset, const char *name,
+						u64 addr, u64 size)
+{
+	char buf[sizeof(__be32) * 2 * 2];
+		/* assume dt_root_[addr|size]_cells <= 2 */
+	void *prop;
+	size_t buf_size;
+
+	buf_size = of_fdt_reg_cells_size();
+	prop = buf;
+
+	fill_property(prop, addr, dt_root_addr_cells);
+	prop += dt_root_addr_cells * sizeof(u32);
+
+	fill_property(prop, size, dt_root_size_cells);
+
+	return fdt_setprop(fdt, nodeoffset, name, buf, buf_size);
+}
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index b9cd9ebdf9b9..9615d6142578 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -37,8 +37,8 @@ extern void *of_fdt_unflatten_tree(const unsigned long *blob,
 				   struct device_node **mynodes);
 
 /* TBD: Temporary export of fdt globals - remove when code fully merged */
-extern int __initdata dt_root_addr_cells;
-extern int __initdata dt_root_size_cells;
+extern int dt_root_addr_cells;
+extern int dt_root_size_cells;
 extern void *initial_boot_params;
 
 extern char __dtb_start[];
@@ -108,5 +108,11 @@ static inline void unflatten_device_tree(void) {}
 static inline void unflatten_and_copy_device_tree(void) {}
 #endif /* CONFIG_OF_EARLY_FLATTREE */
 
+bool of_fdt_cells_size_fitted(u64 base, u64 size);
+size_t of_fdt_reg_cells_size(void);
+int fdt_prop_len(const char *prop_name, int len);
+int fdt_setprop_reg(void *fdt, int nodeoffset, const char *name,
+						u64 addr, u64 size);
+
 #endif /* __ASSEMBLY__ */
 #endif /* _LINUX_OF_FDT_H */
-- 
2.18.0

^ permalink raw reply related

* Re: [PATCH] net/mlx5: fix possible endless loop when clearing flow flags
From: Nélio Laranjeiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: Yongseok Koh; +Cc: shahafs, dev
In-Reply-To: <20180723182744.1179-1-yskoh@mellanox.com>

On Mon, Jul 23, 2018 at 11:27:44AM -0700, Yongseok Koh wrote:
> If one of (*priv->rxqs)[] is null, the for loop can iterate infinitely as
> idx can't be increased.
> 
> Fixes: cd24d526395e ("net/mlx5: add mark/flag flow action")
> Cc: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
> 
> Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
> ---
>  drivers/net/mlx5/mlx5_flow.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
> index 32854198b..c156f01eb 100644
> --- a/drivers/net/mlx5/mlx5_flow.c
> +++ b/drivers/net/mlx5/mlx5_flow.c
> @@ -2762,22 +2762,20 @@ mlx5_flow_rxq_flags_clear(struct rte_eth_dev *dev)
>  {
>  	struct priv *priv = dev->data->dev_private;
>  	unsigned int i;
> -	unsigned int idx;
>  
> -	for (idx = 0, i = 0; idx != priv->rxqs_n; ++i) {
> +	for (i = 0; i != priv->rxqs_n; ++i) {
>  		struct mlx5_rxq_ctrl *rxq_ctrl;
>  		unsigned int j;
>  
> -		if (!(*priv->rxqs)[idx])
> +		if (!(*priv->rxqs)[i])
>  			continue;
> -		rxq_ctrl = container_of((*priv->rxqs)[idx],
> +		rxq_ctrl = container_of((*priv->rxqs)[i],
>  					struct mlx5_rxq_ctrl, rxq);
>  		rxq_ctrl->flow_mark_n = 0;
>  		rxq_ctrl->rxq.mark = 0;
>  		for (j = 0; j != MLX5_FLOW_TUNNEL; ++j)
>  			rxq_ctrl->flow_tunnels_n[j] = 0;
>  		rxq_ctrl->rxq.tunnel = 0;
> -		++idx;
>  	}
>  }
>  
> -- 
> 2.11.0
 
This patch is wrong, (*priv->rxqs)[i] may un-initialised by the
application, the number of queues says how are in used, it does not mean
they are contiguous in the rxqs arrays and this due to the DPDK API
which configure the number of queues with rte_eth_dev_configure()
whereas queues are instantiated with rte_eth_rx_queue_setup() which
takes an position in the array as parameter.

Indeed this code is wrong, idx should always increase whereas i should
only increase if the (*priv->rxqs)[idx] is non null.

-- 
Nélio Laranjeiro
6WIND

^ permalink raw reply

* [PATCH v12 05/16] kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

In kdump case, there exists only one dedicated memblock region as usable
memory (crashk_res). With this patch, kexec_walk_memblock() runs a given
callback function on this region.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 kernel/kexec_file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 2f0691b0f8ad..bb23f9280a7a 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -511,6 +511,9 @@ static int kexec_walk_memblock(struct kexec_buf *kbuf,
 	phys_addr_t mstart, mend;
 	struct resource res = { };
 
+	if (kbuf->image->type == KEXEC_TYPE_CRASH)
+		return func(&crashk_res, kbuf);
+
 	if (kbuf->top_down) {
 		for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
 						&mstart, &mend, NULL) {
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 04/16] powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem()
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Memblock list is another source for usable system memory layout.
So move powerpc's arch_kexec_walk_mem() to common code so that other
memblock-based architectures, particularly arm64, can also utilise it.
A moved function is now renamed to kexec_walk_memblock() and integrated
into kexec_locate_mem_hole(), which will now be usable for all
architectures with no need for overriding arch_kexec_walk_mem().

kexec_walk_memblock() will not work for kdump in this form, this will be
fixed in the next patch.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Acked-by: James Morse <james.morse@arm.com>
---
 arch/powerpc/kernel/machine_kexec_file_64.c | 54 -------------------
 include/linux/kexec.h                       |  2 -
 kernel/kexec_file.c                         | 58 ++++++++++++++++++++-
 3 files changed, 56 insertions(+), 58 deletions(-)

diff --git a/arch/powerpc/kernel/machine_kexec_file_64.c b/arch/powerpc/kernel/machine_kexec_file_64.c
index 0bd23dc789a4..5357b09902c5 100644
--- a/arch/powerpc/kernel/machine_kexec_file_64.c
+++ b/arch/powerpc/kernel/machine_kexec_file_64.c
@@ -24,7 +24,6 @@
 
 #include <linux/slab.h>
 #include <linux/kexec.h>
-#include <linux/memblock.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/ima.h>
@@ -46,59 +45,6 @@ int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
 	return kexec_image_probe_default(image, buf, buf_len);
 }
 
-/**
- * arch_kexec_walk_mem - call func(data) for each unreserved memory block
- * @kbuf:	Context info for the search. Also passed to @func.
- * @func:	Function to call for each memory block.
- *
- * This function is used by kexec_add_buffer and kexec_locate_mem_hole
- * to find unreserved memory to load kexec segments into.
- *
- * Return: The memory walk will stop when func returns a non-zero value
- * and that value will be returned. If all free regions are visited without
- * func returning non-zero, then zero will be returned.
- */
-int arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			int (*func)(struct resource *, void *))
-{
-	int ret = 0;
-	u64 i;
-	phys_addr_t mstart, mend;
-	struct resource res = { };
-
-	if (kbuf->top_down) {
-		for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
-						&mstart, &mend, NULL) {
-			/*
-			 * In memblock, end points to the first byte after the
-			 * range while in kexec, end points to the last byte
-			 * in the range.
-			 */
-			res.start = mstart;
-			res.end = mend - 1;
-			ret = func(&res, kbuf);
-			if (ret)
-				break;
-		}
-	} else {
-		for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend,
-					NULL) {
-			/*
-			 * In memblock, end points to the first byte after the
-			 * range while in kexec, end points to the last byte
-			 * in the range.
-			 */
-			res.start = mstart;
-			res.end = mend - 1;
-			ret = func(&res, kbuf);
-			if (ret)
-				break;
-		}
-	}
-
-	return ret;
-}
-
 /**
  * setup_purgatory - initialize the purgatory's global variables
  * @image:		kexec image.
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 49ab758f4d91..c196bfd11bee 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -184,8 +184,6 @@ int __weak arch_kexec_apply_relocations(struct purgatory_info *pi,
 					const Elf_Shdr *relsec,
 					const Elf_Shdr *symtab);
 
-int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			       int (*func)(struct resource *, void *));
 extern int kexec_add_buffer(struct kexec_buf *kbuf);
 int kexec_locate_mem_hole(struct kexec_buf *kbuf);
 
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index bf39df5e5bb9..2f0691b0f8ad 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -16,6 +16,7 @@
 #include <linux/file.h>
 #include <linux/slab.h>
 #include <linux/kexec.h>
+#include <linux/memblock.h>
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/fs.h>
@@ -501,6 +502,55 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
 	return locate_mem_hole_bottom_up(start, end, kbuf);
 }
 
+#if defined(CONFIG_HAVE_MEMBLOCK) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
+static int kexec_walk_memblock(struct kexec_buf *kbuf,
+			       int (*func)(struct resource *, void *))
+{
+	int ret = 0;
+	u64 i;
+	phys_addr_t mstart, mend;
+	struct resource res = { };
+
+	if (kbuf->top_down) {
+		for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
+						&mstart, &mend, NULL) {
+			/*
+			 * In memblock, end points to the first byte after the
+			 * range while in kexec, end points to the last byte
+			 * in the range.
+			 */
+			res.start = mstart;
+			res.end = mend - 1;
+			ret = func(&res, kbuf);
+			if (ret)
+				break;
+		}
+	} else {
+		for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend,
+					NULL) {
+			/*
+			 * In memblock, end points to the first byte after the
+			 * range while in kexec, end points to the last byte
+			 * in the range.
+			 */
+			res.start = mstart;
+			res.end = mend - 1;
+			ret = func(&res, kbuf);
+			if (ret)
+				break;
+		}
+	}
+
+	return ret;
+}
+#else
+static int kexec_walk_memblock(struct kexec_buf *kbuf,
+			       int (*func)(struct resource *, void *))
+{
+	return 0;
+}
+#endif
+
 /**
  * arch_kexec_walk_mem - call func(data) on free memory regions
  * @kbuf:	Context info for the search. Also passed to @func.
@@ -510,7 +560,7 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
  * and that value will be returned. If all free regions are visited without
  * func returning non-zero, then zero will be returned.
  */
-int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
+static int arch_kexec_walk_mem(struct kexec_buf *kbuf,
 			       int (*func)(struct resource *, void *))
 {
 	if (kbuf->image->type == KEXEC_TYPE_CRASH)
@@ -538,7 +588,11 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 	if (kbuf->mem)
 		return 0;
 
-	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
+	if (IS_ENABLED(CONFIG_HAVE_MEMBLOCK) &&
+			!IS_ENABLED(CONFIG_ARCH_DISCARD_MEMBLOCK))
+		ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
+	else
+		ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
 
 	return ret == 1 ? 0 : -EADDRNOTAVAIL;
 }
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 03/16] s390, kexec_file: drop arch_kexec_mem_walk()
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Since s390 already knows where to locate buffers, calling
arch_kexec_mem_walk() has no sense. So we can just drop it as kbuf->mem
indicates this while all other architectures sets it to 0 initially.

This change is a preparatory work for the next patch, where all the
variant memory walks, either on system resource or memblock, will be
put in one common place so that it will satisfy all the architectures'
need.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 arch/s390/kernel/machine_kexec_file.c | 10 ----------
 kernel/kexec_file.c                   |  4 ++++
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
index f413f57f8d20..32023b4f9dc0 100644
--- a/arch/s390/kernel/machine_kexec_file.c
+++ b/arch/s390/kernel/machine_kexec_file.c
@@ -134,16 +134,6 @@ int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data,
 	return ret;
 }
 
-/*
- * The kernel is loaded to a fixed location. Turn off kexec_locate_mem_hole
- * and provide kbuf->mem by hand.
- */
-int arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			int (*func)(struct resource *, void *))
-{
-	return 1;
-}
-
 int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
 				     Elf_Shdr *section,
 				     const Elf_Shdr *relsec,
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 63c7ce1c0c3e..bf39df5e5bb9 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -534,6 +534,10 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 {
 	int ret;
 
+	/* Arch knows where to place */
+	if (kbuf->mem)
+		return 0;
+
 	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
 
 	return ret == 1 ? 0 : -EADDRNOTAVAIL;
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 03/16] s390, kexec_file: drop arch_kexec_mem_walk()
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, bhsharma, kexec, linux-kernel, AKASHI Takahiro,
	james.morse, linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Since s390 already knows where to locate buffers, calling
arch_kexec_mem_walk() has no sense. So we can just drop it as kbuf->mem
indicates this while all other architectures sets it to 0 initially.

This change is a preparatory work for the next patch, where all the
variant memory walks, either on system resource or memblock, will be
put in one common place so that it will satisfy all the architectures'
need.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 arch/s390/kernel/machine_kexec_file.c | 10 ----------
 kernel/kexec_file.c                   |  4 ++++
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
index f413f57f8d20..32023b4f9dc0 100644
--- a/arch/s390/kernel/machine_kexec_file.c
+++ b/arch/s390/kernel/machine_kexec_file.c
@@ -134,16 +134,6 @@ int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data,
 	return ret;
 }
 
-/*
- * The kernel is loaded to a fixed location. Turn off kexec_locate_mem_hole
- * and provide kbuf->mem by hand.
- */
-int arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			int (*func)(struct resource *, void *))
-{
-	return 1;
-}
-
 int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
 				     Elf_Shdr *section,
 				     const Elf_Shdr *relsec,
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 63c7ce1c0c3e..bf39df5e5bb9 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -534,6 +534,10 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 {
 	int ret;
 
+	/* Arch knows where to place */
+	if (kbuf->mem)
+		return 0;
+
 	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
 
 	return ret == 1 ? 0 : -EADDRNOTAVAIL;
-- 
2.18.0


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

^ permalink raw reply related

* [PATCH v12 02/16] kexec_file: make kexec_image_post_load_cleanup_default() global
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Change this function from static to global so that arm64 can implement
its own arch_kimage_file_post_load_cleanup() later using
kexec_image_post_load_cleanup_default().

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 include/linux/kexec.h | 1 +
 kernel/kexec_file.c   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 9e4e638fb505..49ab758f4d91 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -143,6 +143,7 @@ extern const struct kexec_file_ops * const kexec_file_loaders[];
 
 int kexec_image_probe_default(struct kimage *image, void *buf,
 			      unsigned long buf_len);
+int kexec_image_post_load_cleanup_default(struct kimage *image);
 
 /**
  * struct kexec_buf - parameters for finding a place for a buffer in memory
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index c6a3b6851372..63c7ce1c0c3e 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -78,7 +78,7 @@ void * __weak arch_kexec_kernel_image_load(struct kimage *image)
 	return kexec_image_load_default(image);
 }
 
-static int kexec_image_post_load_cleanup_default(struct kimage *image)
+int kexec_image_post_load_cleanup_default(struct kimage *image)
 {
 	if (!image->fops || !image->fops->cleanup)
 		return 0;
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 01/16] asm-generic: add kexec_file_load system call to unistd.h
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

The initial user of this system call number is arm64.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
---
 include/uapi/asm-generic/unistd.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 42990676a55e..c81f4a0df51f 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -734,9 +734,11 @@ __SYSCALL(__NR_pkey_free,     sys_pkey_free)
 __SYSCALL(__NR_statx,     sys_statx)
 #define __NR_io_pgetevents 292
 __SC_COMP(__NR_io_pgetevents, sys_io_pgetevents, compat_sys_io_pgetevents)
+#define __NR_kexec_file_load 293
+__SYSCALL(__NR_kexec_file_load,     sys_kexec_file_load)
 
 #undef __NR_syscalls
-#define __NR_syscalls 293
+#define __NR_syscalls 294
 
 /*
  * 32 bit systems traditionally used different
-- 
2.18.0

^ permalink raw reply related

* [PATCH v12 00/16] arm64: kexec: add kexec_file_load() support
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel

This is the twelfth round of implementing kexec_file_load() support
on arm64.[1] (See "Changes" below)
Most of the code is based on kexec-tools.


This patch series enables us to
  * load the kernel by specifying its file descriptor, instead of user-
    filled buffer, at kexec_file_load() system call, and
  * optionally verify its signature at load time for trusted boot.
Kernel virtual address randomization is also supported since v9.

Contrary to kexec_load() system call, as we discussed a long time ago,
users may not be allowed to provide a device tree to the 2nd kernel
explicitly, hence enforcing a dt blob of the first kernel to be re-used
internally.

To use kexec_file_load() system call, instead of kexec_load(), at kexec
command, '-s' option must be specified. See [2] for a necessary patch for
kexec-tools.

To analyze a generated crash dump file, use the latest master branch of
crash utility[3]. I always try to submit patches to fix any inconsistencies
introduced in the latest kernel.

Regarding a kernel image verification, a signature must be presented
along with the binary itself. A signature is basically a hash value
calculated against the whole binary data and encrypted by a key which
will be authenticated by one of the system's trusted certificates.
Any attempt to read and load a to-be-kexec-ed kernel image through
a system call will be checked and blocked if the binary's hash value
doesn't match its associated signature.

There are two methods available now:
1. implementing arch-specific verification hook of kexec_file_load()
2. utilizing IMA(Integrity Measurement Architecture)[4] appraisal framework

Before my v7, I believed that my patch only supports (1) but am now
confident that (2) comes free if IMA is enabled and properly configured.


(1) Arch-specific verification hook
If CONFIG_KEXEC_VERIFY_SIG is enabled, kexec_file_load() invokes an arch-
defined (and hence file-format-specific) hook function to check for the
validity of kernel binary.

On x86, a signature is embedded into a PE file (Microsoft's format) header
of binary. Since arm64's "Image" can also be seen as a PE file as far as
CONFIG_EFI is enabled, we adopt this format for kernel signing.  

As in the case of UEFI applications, we can create a signed kernel image:
    $ sbsign --key ${KEY} --cert ${CERT} Image

You may want to use certs/signing_key.pem, which is intended to be used
for module signing (CONFIG_MODULE_SIG), as ${KEY} and ${CERT} for test
purpose.


(2) IMA appraisal-based
IMA was first introduced in linux in order to meet TCG (Trusted Computing
Group) requirement that all the sensitive files be *measured* before
reading/executing them to detect any untrusted changes/modification.
Then appraisal feature, which allows us to ensure the integrity of
files and even prevent them from reading/executing, was added later.

Meanwhile, kexec_file_load() has been merged since v3.17 and evolved to
enable IMA-appraisal type verification by the commit b804defe4297 ("kexec:
replace call to copy_file_from_fd() with kernel version").

In this scheme, a signature will be stored in a extended file attribute,
"security.ima" while a decryption key is hold in a dedicated keyring,
".ima" or "_ima".  All the necessary process of verification is confined
in a secure API, kernel_read_file_from_fd(), called by kexec_file_load().

    Please note that powerpc is one of the two architectures now
    supporting KEXEC_FILE, and that it wishes to extend IMA,
    where a signature may be appended to "vmlinux" file[5], like module
    signing, instead of using an extended file attribute.

While IMA meant to be used with TPM (Trusted Platform Module) on secure
platform, IMA is still usable without TPM. Here is an example procedure
about how we can give it a try to run the feature using a self-signed
root ca for demo/test purposes:

 1) Generate needed keys and certificates, following "Generate trusted
    keys" section in README of ima-evm-utils[6].

 2) Build the kernel with the following kernel configurations, specifying
    "ima-local-ca.pem" for CONFIG_SYSTEM_TRUSTED_KEYS:
	CONFIG_EXT4_FS_SECURITY
	CONFIG_INTEGRITY_SIGNATURE
	CONFIG_INTEGRITY_ASYMMETRIC_KEYS
	CONFIG_INTEGRITY_TRUSTED_KEYRING
	CONFIG_IMA
	CONFIG_IMA_WRITE_POLICY
	CONFIG_IMA_READ_POLICY
	CONFIG_IMA_APPRAISE
	CONFIG_IMA_APPRAISE_BOOTPARAM
	CONFIG_SYSTEM_TRUSTED_KEYS
    Please note that CONFIG_KEXEC_VERIFY_SIG is not, actually should
    not be, enabled.

 3) Sign(label) a kernel image binary to be kexec-ed on target filesystem:
    $ evmctl ima_sign --key /path/to/private_key.pem /your/Image

 4) Add a command line parameter and boot the kernel:
    ima_appraise=enforce

 On live system,
 5) Set a security policy:
    $ mount -t securityfs none /sys/kernel/security
    $ echo "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig" \
      > /sys/kernel/security/ima/policy

 6) Add a key for ima:
    $ keyctl padd asymmetric my_ima_key %:.ima < /path/to/x509_ima.der
    (or evmctl import /path/to/x509_ima.der <ima_keyring_id>)

 7) Then try kexec as normal.


Concerns(or future works):
* Support for physical address randomization
* Signature verification of big endian kernel with CONFIG_KEXEC_VERIFY_SIG
  While big-endian kernel can support kernel signing, I'm not sure that
  Image can be recognized as in PE format because x86 standard only
  defines little-endian-based format.
* Support for vminux loading

  [1] http://git.linaro.org/people/takahiro.akashi/linux-aarch64.git
	branch:arm64/kexec_file
  [2] http://git.linaro.org/people/takahiro.akashi/kexec-tools.git
	branch:arm64/kexec_file
  [3] http://github.com/crash-utility/crash.git
  [4] https://sourceforge.net/p/linux-ima/wiki/Home/
  [5] http://lkml.iu.edu//hypermail/linux/kernel/1707.0/03669.html
  [6] https://sourceforge.net/p/linux-ima/ima-evm-utils/ci/master/tree/


Changes in v12 (July 24, 2018)
 (mostly addressing James' comments)
* unify all the variants of arch_kexec_walk_mem(), including s390's, into
  common code, leaving arch_kexec_walk_mem() static (i.e. no longer
  replacable)
* always initialize kbuf.mem to zero to align with a change above
* set kbuf.buf_min/buf_max consistently between kexec and kdump
* try to consistently use "unsigned long" for physical (kexec-time)
  address, and "void *" for virtual (runtime) address in
  load_other_segments() with a couple of variables renamed for readability
* fix a 'sparse' warning against arch_kimage_file_post_load_cleanup()
* fix a calculation of string lengh of "ARM64_MAGIC"
* set kernel image alignment to MIN_KIMG_ALIGN rather than SZ_2M
* set elf header alignment to SZ_64K rather than SZ_4K


Changes in v11 (July 11, 2018)
* split v10's patch#3, a refactoring stuff, into two parts, "just move"
  and modify
* remove selecting BUILD_BIN2C from KEXEC_FILE config
* modify setup_dtb()
   * to correct a return value on failure of fdt_xyz() call,
   * to always remove existing bootargs and initrd-start/end properties,
     if any, when copying current system's dtb into new dtb
   * to use fdt_setprop_string() for bootargs (I'm now sure that
     kimage->cmdline_buf is a null-terminated string.)
* revise a warning comment in case of KEXEC_VERIFY_SIG but
  !(EFI && SIGNED_PE_FILE_VERIFICATION)

Changes in v10 (June 23, 2018)
* rebased to v4.18-rc
* change syscall numer of kexec_file_load from 292 to 293
* factor out memblock-based arch_kexec_walk_mem() from powerpc and
  merge it into generic one
* move generic fdt helper functions from arm64 dir to drivers/of
  (dt_root_[addr|size]_cells are no longer __initdata.)
* modify fill_property() to use 'while' loop
* modify fdt_setprop_reg() to allocate a buffer on stack
* modify setup_dtb() to use fdt_setprop_u64()
* pass kernel_load_addr/size directly as arguments, instead of via
  kimage_arch.kern_segment, at load_other_segments()
* refuse loading an image which cannot be supported in image loader,
  adding cpu-feature(MMFR0) helper functions
* modify prepare_elf_headers() to use kmalloc() instead of vmalloc()
* always pass arch.dtb_mem as the fourth argument to cpu_soft_restart()
  in machine_kexec() while dtb_mem will be zero in kexec case

Changes in v9 (April 25, 2018)
* rebased to v4.17-rc
* remove preparatory patches on generic/x86/ppc code
  They have now been merged in v4.17-rc1.
* allocate memory based on memblock list instead of system resources
  This will prevent reserved regions, particularly UEFI/ACPI data,
  from being corrupted.
* correct dt property names, linux,initrd-*, in newly-created dtb
  "linux," was missing.
* remove alignment requirement for initrd loading
* add kaslr (kernel virtual address randomization) support
* misc code clean-up
* revise commit messages

Changes in v8 (Feb 22, 2018)
* introduce ARCH_HAS_KEXEC_PURGATORY so that arm64 will be able to skip
  purgatory
* remove "ifdef CONFIG_X86_64" stuffs from a re-factored function,
  prepare_elf64_headers(), making its interface more generic
  (The original patch was split into two for easier reviews.)
* modify cpu_soft_restart() so as to let the 2nd kernel jump into its entry
  code directly without requiring purgatory in case of kexec_file_load
* remove CONFIG_KEXEC_FILE_IMAGE_FMT and introduce
  CONFIG_KEXEC_IMAGE_VERIFY_SIG, much similar to x86 but quite redundant
  for now.
* In addition, update/modify dependencies of KEXEC_IMAGE_VERIFY_SIG

Changes in v7 (Dec 4, 2017)
* rebased to v4.15-rc2
* re-organize the patch set to separate KEXEC_FILE_VERIFY_SIG-related
  code from the others
* revamp factored-out code in kernel/kexec_file.c due to the changes
  in original x86 code
* redefine walk_sys_ram_res_rev() prototype due to change of callback
  type in the counterpart, walk_sys_ram_res()
* make KEXEC_FILE_IMAGE_FMT default on if KEXEC_FILE selected

Changes in v6 (Oct 24, 2017)
* fix a for-loop bug in _kexec_kernel_image_probe() per Julien

Changes in v5 (Oct 10, 2017)
* fix kbuild errors around patch #3
per Julien's comments,
* fix a bug in walk_system_ram_res_rev() with some cleanup
* modify fdt_setprop_range() to use vmalloc()
* modify fill_property() to use memset()

Changes in v4 (Oct 2, 2017)
* reinstate x86's arch_kexec_kernel_image_load()
* rename weak arch_kexec_kernel_xxx() to _kexec_kernel_xxx() for
  better re-use
* constify kexec_file_loaders[]

Changes in v3 (Sep 15, 2017)
* fix kbuild test error
* factor out arch_kexec_kernel_*() & arch_kimage_file_post_load_cleanup()
* remove CONFIG_CRASH_CORE guard from kexec_file.c
* add vmapped kernel region to vmcore for gdb backtracing
  (see prepare_elf64_headers())
* merge asm/kexec_file.h into asm/kexec.h
* and some cleanups

Changes in v2 (Sep 8, 2017)
* move core-header-related functions from crash_core.c to kexec_file.c
* drop hash-check code from purgatory
* modify purgatory asm to remove arch_kexec_apply_relocations_add()
* drop older kernel support
* drop vmlinux support (at least, for this series)


Patch #1 to #10 are essential part for KEXEC_FILE support
(additionally allowing for IMA-based verification):
  Patch #1 to #6 are all preparatory patches on generic side.
  Patch #7 to #11 are to enable kexec_file_load on arm64.

Patch #12 to #13 are for KEXEC_VERIFY_SIG (arch-specific verification)
support

AKASHI Takahiro (16):
  asm-generic: add kexec_file_load system call to unistd.h
  kexec_file: make kexec_image_post_load_cleanup_default() global
  s390, kexec_file: drop arch_kexec_mem_walk()
  powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem()
  kexec_file: kexec_walk_memblock() only walks a dedicated region at
    kdump
  of/fdt: add helper functions for handling properties
  arm64: add image head flag definitions
  arm64: cpufeature: add MMFR0 helper functions
  arm64: enable KEXEC_FILE config
  arm64: kexec_file: load initrd and device-tree
  arm64: kexec_file: allow for loading Image-format kernel
  arm64: kexec_file: add crash dump support
  arm64: kexec_file: invoke the kernel without purgatory
  include: pe.h: remove message[] from mz header definition
  arm64: kexec_file: add kernel signature verification support
  arm64: kexec_file: add kaslr support

 arch/arm64/Kconfig                          |  33 ++
 arch/arm64/include/asm/boot.h               |  15 +
 arch/arm64/include/asm/cpufeature.h         |  48 +++
 arch/arm64/include/asm/kexec.h              |  49 +++
 arch/arm64/kernel/Makefile                  |   3 +-
 arch/arm64/kernel/cpu-reset.S               |   8 +-
 arch/arm64/kernel/head.S                    |   2 +-
 arch/arm64/kernel/kexec_image.c             | 123 ++++++++
 arch/arm64/kernel/machine_kexec.c           |  12 +-
 arch/arm64/kernel/machine_kexec_file.c      | 314 ++++++++++++++++++++
 arch/arm64/kernel/relocate_kernel.S         |   3 +-
 arch/powerpc/kernel/machine_kexec_file_64.c |  54 ----
 arch/s390/kernel/machine_kexec_file.c       |  10 -
 drivers/of/fdt.c                            |  62 +++-
 include/linux/kexec.h                       |   3 +-
 include/linux/of_fdt.h                      |  10 +-
 include/linux/pe.h                          |   2 +-
 include/uapi/asm-generic/unistd.h           |   4 +-
 kernel/kexec_file.c                         |  67 ++++-
 19 files changed, 738 insertions(+), 84 deletions(-)
 create mode 100644 arch/arm64/kernel/kexec_image.c
 create mode 100644 arch/arm64/kernel/machine_kexec_file.c

-- 
2.18.0

^ permalink raw reply

* [PATCH v12 04/16] powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem()
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, james.morse, bhsharma, kexec, linux-arm-kernel,
	linux-kernel, AKASHI Takahiro, Eric W. Biederman
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Memblock list is another source for usable system memory layout.
So move powerpc's arch_kexec_walk_mem() to common code so that other
memblock-based architectures, particularly arm64, can also utilise it.
A moved function is now renamed to kexec_walk_memblock() and integrated
into kexec_locate_mem_hole(), which will now be usable for all
architectures with no need for overriding arch_kexec_walk_mem().

kexec_walk_memblock() will not work for kdump in this form, this will be
fixed in the next patch.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Acked-by: James Morse <james.morse@arm.com>
---
 arch/powerpc/kernel/machine_kexec_file_64.c | 54 -------------------
 include/linux/kexec.h                       |  2 -
 kernel/kexec_file.c                         | 58 ++++++++++++++++++++-
 3 files changed, 56 insertions(+), 58 deletions(-)

diff --git a/arch/powerpc/kernel/machine_kexec_file_64.c b/arch/powerpc/kernel/machine_kexec_file_64.c
index 0bd23dc789a4..5357b09902c5 100644
--- a/arch/powerpc/kernel/machine_kexec_file_64.c
+++ b/arch/powerpc/kernel/machine_kexec_file_64.c
@@ -24,7 +24,6 @@
 
 #include <linux/slab.h>
 #include <linux/kexec.h>
-#include <linux/memblock.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/ima.h>
@@ -46,59 +45,6 @@ int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
 	return kexec_image_probe_default(image, buf, buf_len);
 }
 
-/**
- * arch_kexec_walk_mem - call func(data) for each unreserved memory block
- * @kbuf:	Context info for the search. Also passed to @func.
- * @func:	Function to call for each memory block.
- *
- * This function is used by kexec_add_buffer and kexec_locate_mem_hole
- * to find unreserved memory to load kexec segments into.
- *
- * Return: The memory walk will stop when func returns a non-zero value
- * and that value will be returned. If all free regions are visited without
- * func returning non-zero, then zero will be returned.
- */
-int arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			int (*func)(struct resource *, void *))
-{
-	int ret = 0;
-	u64 i;
-	phys_addr_t mstart, mend;
-	struct resource res = { };
-
-	if (kbuf->top_down) {
-		for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
-						&mstart, &mend, NULL) {
-			/*
-			 * In memblock, end points to the first byte after the
-			 * range while in kexec, end points to the last byte
-			 * in the range.
-			 */
-			res.start = mstart;
-			res.end = mend - 1;
-			ret = func(&res, kbuf);
-			if (ret)
-				break;
-		}
-	} else {
-		for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend,
-					NULL) {
-			/*
-			 * In memblock, end points to the first byte after the
-			 * range while in kexec, end points to the last byte
-			 * in the range.
-			 */
-			res.start = mstart;
-			res.end = mend - 1;
-			ret = func(&res, kbuf);
-			if (ret)
-				break;
-		}
-	}
-
-	return ret;
-}
-
 /**
  * setup_purgatory - initialize the purgatory's global variables
  * @image:		kexec image.
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 49ab758f4d91..c196bfd11bee 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -184,8 +184,6 @@ int __weak arch_kexec_apply_relocations(struct purgatory_info *pi,
 					const Elf_Shdr *relsec,
 					const Elf_Shdr *symtab);
 
-int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			       int (*func)(struct resource *, void *));
 extern int kexec_add_buffer(struct kexec_buf *kbuf);
 int kexec_locate_mem_hole(struct kexec_buf *kbuf);
 
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index bf39df5e5bb9..2f0691b0f8ad 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -16,6 +16,7 @@
 #include <linux/file.h>
 #include <linux/slab.h>
 #include <linux/kexec.h>
+#include <linux/memblock.h>
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/fs.h>
@@ -501,6 +502,55 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
 	return locate_mem_hole_bottom_up(start, end, kbuf);
 }
 
+#if defined(CONFIG_HAVE_MEMBLOCK) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
+static int kexec_walk_memblock(struct kexec_buf *kbuf,
+			       int (*func)(struct resource *, void *))
+{
+	int ret = 0;
+	u64 i;
+	phys_addr_t mstart, mend;
+	struct resource res = { };
+
+	if (kbuf->top_down) {
+		for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
+						&mstart, &mend, NULL) {
+			/*
+			 * In memblock, end points to the first byte after the
+			 * range while in kexec, end points to the last byte
+			 * in the range.
+			 */
+			res.start = mstart;
+			res.end = mend - 1;
+			ret = func(&res, kbuf);
+			if (ret)
+				break;
+		}
+	} else {
+		for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend,
+					NULL) {
+			/*
+			 * In memblock, end points to the first byte after the
+			 * range while in kexec, end points to the last byte
+			 * in the range.
+			 */
+			res.start = mstart;
+			res.end = mend - 1;
+			ret = func(&res, kbuf);
+			if (ret)
+				break;
+		}
+	}
+
+	return ret;
+}
+#else
+static int kexec_walk_memblock(struct kexec_buf *kbuf,
+			       int (*func)(struct resource *, void *))
+{
+	return 0;
+}
+#endif
+
 /**
  * arch_kexec_walk_mem - call func(data) on free memory regions
  * @kbuf:	Context info for the search. Also passed to @func.
@@ -510,7 +560,7 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
  * and that value will be returned. If all free regions are visited without
  * func returning non-zero, then zero will be returned.
  */
-int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
+static int arch_kexec_walk_mem(struct kexec_buf *kbuf,
 			       int (*func)(struct resource *, void *))
 {
 	if (kbuf->image->type == KEXEC_TYPE_CRASH)
@@ -538,7 +588,11 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 	if (kbuf->mem)
 		return 0;
 
-	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
+	if (IS_ENABLED(CONFIG_HAVE_MEMBLOCK) &&
+			!IS_ENABLED(CONFIG_ARCH_DISCARD_MEMBLOCK))
+		ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
+	else
+		ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
 
 	return ret == 1 ? 0 : -EADDRNOTAVAIL;
 }
-- 
2.18.0


^ permalink raw reply related

* [PATCH v12 02/16] kexec_file: make kexec_image_post_load_cleanup_default() global
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, bhsharma, kexec, linux-kernel, AKASHI Takahiro,
	james.morse, linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Change this function from static to global so that arm64 can implement
its own arch_kimage_file_post_load_cleanup() later using
kexec_image_post_load_cleanup_default().

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 include/linux/kexec.h | 1 +
 kernel/kexec_file.c   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 9e4e638fb505..49ab758f4d91 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -143,6 +143,7 @@ extern const struct kexec_file_ops * const kexec_file_loaders[];
 
 int kexec_image_probe_default(struct kimage *image, void *buf,
 			      unsigned long buf_len);
+int kexec_image_post_load_cleanup_default(struct kimage *image);
 
 /**
  * struct kexec_buf - parameters for finding a place for a buffer in memory
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index c6a3b6851372..63c7ce1c0c3e 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -78,7 +78,7 @@ void * __weak arch_kexec_kernel_image_load(struct kimage *image)
 	return kexec_image_load_default(image);
 }
 
-static int kexec_image_post_load_cleanup_default(struct kimage *image)
+int kexec_image_post_load_cleanup_default(struct kimage *image)
 {
 	if (!image->fops || !image->fops->cleanup)
 		return 0;
-- 
2.18.0


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

^ permalink raw reply related

* [PATCH v12 03/16] s390, kexec_file: drop arch_kexec_mem_walk()
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, james.morse, bhsharma, kexec, linux-arm-kernel,
	linux-kernel, AKASHI Takahiro
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Since s390 already knows where to locate buffers, calling
arch_kexec_mem_walk() has no sense. So we can just drop it as kbuf->mem
indicates this while all other architectures sets it to 0 initially.

This change is a preparatory work for the next patch, where all the
variant memory walks, either on system resource or memblock, will be
put in one common place so that it will satisfy all the architectures'
need.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 arch/s390/kernel/machine_kexec_file.c | 10 ----------
 kernel/kexec_file.c                   |  4 ++++
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
index f413f57f8d20..32023b4f9dc0 100644
--- a/arch/s390/kernel/machine_kexec_file.c
+++ b/arch/s390/kernel/machine_kexec_file.c
@@ -134,16 +134,6 @@ int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data,
 	return ret;
 }
 
-/*
- * The kernel is loaded to a fixed location. Turn off kexec_locate_mem_hole
- * and provide kbuf->mem by hand.
- */
-int arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			int (*func)(struct resource *, void *))
-{
-	return 1;
-}
-
 int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
 				     Elf_Shdr *section,
 				     const Elf_Shdr *relsec,
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 63c7ce1c0c3e..bf39df5e5bb9 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -534,6 +534,10 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 {
 	int ret;
 
+	/* Arch knows where to place */
+	if (kbuf->mem)
+		return 0;
+
 	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
 
 	return ret == 1 ? 0 : -EADDRNOTAVAIL;
-- 
2.18.0


^ permalink raw reply related

* [PATCH v12 02/16] kexec_file: make kexec_image_post_load_cleanup_default() global
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, james.morse, bhsharma, kexec, linux-arm-kernel,
	linux-kernel, AKASHI Takahiro
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

Change this function from static to global so that arm64 can implement
its own arch_kimage_file_post_load_cleanup() later using
kexec_image_post_load_cleanup_default().

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 include/linux/kexec.h | 1 +
 kernel/kexec_file.c   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 9e4e638fb505..49ab758f4d91 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -143,6 +143,7 @@ extern const struct kexec_file_ops * const kexec_file_loaders[];
 
 int kexec_image_probe_default(struct kimage *image, void *buf,
 			      unsigned long buf_len);
+int kexec_image_post_load_cleanup_default(struct kimage *image);
 
 /**
  * struct kexec_buf - parameters for finding a place for a buffer in memory
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index c6a3b6851372..63c7ce1c0c3e 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -78,7 +78,7 @@ void * __weak arch_kexec_kernel_image_load(struct kimage *image)
 	return kexec_image_load_default(image);
 }
 
-static int kexec_image_post_load_cleanup_default(struct kimage *image)
+int kexec_image_post_load_cleanup_default(struct kimage *image)
 {
 	if (!image->fops || !image->fops->cleanup)
 		return 0;
-- 
2.18.0


^ permalink raw reply related

* [PATCH 09/10] drm/vc4: Use __drm_atomic_helper_plane_reset instead of copying the logic
From: Maxime Ripard @ 2018-07-24  6:57 UTC (permalink / raw)
  To: linux-arm-kernel
In-Reply-To: <20180720211509.23605-10-alexandru-cosmin.gheorghe@arm.com>

On Fri, Jul 20, 2018 at 10:15:08PM +0100, Alexandru Gheorghe wrote:
> Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
> ---
>  drivers/gpu/drm/vc4/vc4_plane.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index 9d7a36f148cf..688ad9bb0f08 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -200,9 +200,7 @@ static void vc4_plane_reset(struct drm_plane *plane)
>  	if (!vc4_state)
>  		return;
>  
> -	plane->state = &vc4_state->base;
> -	plane->state->alpha = DRM_BLEND_ALPHA_OPAQUE;
> -	vc4_state->base.plane = plane;
> +	__drm_atomic_helper_plane_reset(plane, &vc4_state->base);

For vc4, rcar-du, atmel-hlcdc and sun4i, you're changing the reset
value of alpha from DRM_BLEND_ALPHA_OPAQUE to
plane->alpha_property->values[1].

This might or might not be a good idea, but you should definitely
explain why.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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^ permalink raw reply

* Re: [PATCH 09/10] drm/vc4: Use __drm_atomic_helper_plane_reset instead of copying the logic
From: Maxime Ripard @ 2018-07-24  6:57 UTC (permalink / raw)
  To: Alexandru Gheorghe
  Cc: alexandre.belloni, airlied, liviu.dudau, dri-devel,
	laurent.pinchart, thellstrom, krzk, wens, kgene, malidp,
	linux-graphics-maintainer, sunpeng.li, boris.brezillon,
	linux-samsung-soc, nd, Tony.Cheng, linux-arm-kernel, sw0312.kim,
	nicolas.ferre, shirish.s, kyungmin.park, alexander.deucher,
	christian.koenig
In-Reply-To: <20180720211509.23605-10-alexandru-cosmin.gheorghe@arm.com>


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On Fri, Jul 20, 2018 at 10:15:08PM +0100, Alexandru Gheorghe wrote:
> Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
> ---
>  drivers/gpu/drm/vc4/vc4_plane.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index 9d7a36f148cf..688ad9bb0f08 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -200,9 +200,7 @@ static void vc4_plane_reset(struct drm_plane *plane)
>  	if (!vc4_state)
>  		return;
>  
> -	plane->state = &vc4_state->base;
> -	plane->state->alpha = DRM_BLEND_ALPHA_OPAQUE;
> -	vc4_state->base.plane = plane;
> +	__drm_atomic_helper_plane_reset(plane, &vc4_state->base);

For vc4, rcar-du, atmel-hlcdc and sun4i, you're changing the reset
value of alpha from DRM_BLEND_ALPHA_OPAQUE to
plane->alpha_property->values[1].

This might or might not be a good idea, but you should definitely
explain why.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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_______________________________________________
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^ permalink raw reply

* [PATCH v12 00/16] arm64: kexec: add kexec_file_load() support
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, bhsharma, kexec, linux-kernel, AKASHI Takahiro,
	james.morse, linux-arm-kernel

This is the twelfth round of implementing kexec_file_load() support
on arm64.[1] (See "Changes" below)
Most of the code is based on kexec-tools.


This patch series enables us to
  * load the kernel by specifying its file descriptor, instead of user-
    filled buffer, at kexec_file_load() system call, and
  * optionally verify its signature at load time for trusted boot.
Kernel virtual address randomization is also supported since v9.

Contrary to kexec_load() system call, as we discussed a long time ago,
users may not be allowed to provide a device tree to the 2nd kernel
explicitly, hence enforcing a dt blob of the first kernel to be re-used
internally.

To use kexec_file_load() system call, instead of kexec_load(), at kexec
command, '-s' option must be specified. See [2] for a necessary patch for
kexec-tools.

To analyze a generated crash dump file, use the latest master branch of
crash utility[3]. I always try to submit patches to fix any inconsistencies
introduced in the latest kernel.

Regarding a kernel image verification, a signature must be presented
along with the binary itself. A signature is basically a hash value
calculated against the whole binary data and encrypted by a key which
will be authenticated by one of the system's trusted certificates.
Any attempt to read and load a to-be-kexec-ed kernel image through
a system call will be checked and blocked if the binary's hash value
doesn't match its associated signature.

There are two methods available now:
1. implementing arch-specific verification hook of kexec_file_load()
2. utilizing IMA(Integrity Measurement Architecture)[4] appraisal framework

Before my v7, I believed that my patch only supports (1) but am now
confident that (2) comes free if IMA is enabled and properly configured.


(1) Arch-specific verification hook
If CONFIG_KEXEC_VERIFY_SIG is enabled, kexec_file_load() invokes an arch-
defined (and hence file-format-specific) hook function to check for the
validity of kernel binary.

On x86, a signature is embedded into a PE file (Microsoft's format) header
of binary. Since arm64's "Image" can also be seen as a PE file as far as
CONFIG_EFI is enabled, we adopt this format for kernel signing.  

As in the case of UEFI applications, we can create a signed kernel image:
    $ sbsign --key ${KEY} --cert ${CERT} Image

You may want to use certs/signing_key.pem, which is intended to be used
for module signing (CONFIG_MODULE_SIG), as ${KEY} and ${CERT} for test
purpose.


(2) IMA appraisal-based
IMA was first introduced in linux in order to meet TCG (Trusted Computing
Group) requirement that all the sensitive files be *measured* before
reading/executing them to detect any untrusted changes/modification.
Then appraisal feature, which allows us to ensure the integrity of
files and even prevent them from reading/executing, was added later.

Meanwhile, kexec_file_load() has been merged since v3.17 and evolved to
enable IMA-appraisal type verification by the commit b804defe4297 ("kexec:
replace call to copy_file_from_fd() with kernel version").

In this scheme, a signature will be stored in a extended file attribute,
"security.ima" while a decryption key is hold in a dedicated keyring,
".ima" or "_ima".  All the necessary process of verification is confined
in a secure API, kernel_read_file_from_fd(), called by kexec_file_load().

    Please note that powerpc is one of the two architectures now
    supporting KEXEC_FILE, and that it wishes to extend IMA,
    where a signature may be appended to "vmlinux" file[5], like module
    signing, instead of using an extended file attribute.

While IMA meant to be used with TPM (Trusted Platform Module) on secure
platform, IMA is still usable without TPM. Here is an example procedure
about how we can give it a try to run the feature using a self-signed
root ca for demo/test purposes:

 1) Generate needed keys and certificates, following "Generate trusted
    keys" section in README of ima-evm-utils[6].

 2) Build the kernel with the following kernel configurations, specifying
    "ima-local-ca.pem" for CONFIG_SYSTEM_TRUSTED_KEYS:
	CONFIG_EXT4_FS_SECURITY
	CONFIG_INTEGRITY_SIGNATURE
	CONFIG_INTEGRITY_ASYMMETRIC_KEYS
	CONFIG_INTEGRITY_TRUSTED_KEYRING
	CONFIG_IMA
	CONFIG_IMA_WRITE_POLICY
	CONFIG_IMA_READ_POLICY
	CONFIG_IMA_APPRAISE
	CONFIG_IMA_APPRAISE_BOOTPARAM
	CONFIG_SYSTEM_TRUSTED_KEYS
    Please note that CONFIG_KEXEC_VERIFY_SIG is not, actually should
    not be, enabled.

 3) Sign(label) a kernel image binary to be kexec-ed on target filesystem:
    $ evmctl ima_sign --key /path/to/private_key.pem /your/Image

 4) Add a command line parameter and boot the kernel:
    ima_appraise=enforce

 On live system,
 5) Set a security policy:
    $ mount -t securityfs none /sys/kernel/security
    $ echo "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig" \
      > /sys/kernel/security/ima/policy

 6) Add a key for ima:
    $ keyctl padd asymmetric my_ima_key %:.ima < /path/to/x509_ima.der
    (or evmctl import /path/to/x509_ima.der <ima_keyring_id>)

 7) Then try kexec as normal.


Concerns(or future works):
* Support for physical address randomization
* Signature verification of big endian kernel with CONFIG_KEXEC_VERIFY_SIG
  While big-endian kernel can support kernel signing, I'm not sure that
  Image can be recognized as in PE format because x86 standard only
  defines little-endian-based format.
* Support for vminux loading

  [1] http://git.linaro.org/people/takahiro.akashi/linux-aarch64.git
	branch:arm64/kexec_file
  [2] http://git.linaro.org/people/takahiro.akashi/kexec-tools.git
	branch:arm64/kexec_file
  [3] http://github.com/crash-utility/crash.git
  [4] https://sourceforge.net/p/linux-ima/wiki/Home/
  [5] http://lkml.iu.edu//hypermail/linux/kernel/1707.0/03669.html
  [6] https://sourceforge.net/p/linux-ima/ima-evm-utils/ci/master/tree/


Changes in v12 (July 24, 2018)
 (mostly addressing James' comments)
* unify all the variants of arch_kexec_walk_mem(), including s390's, into
  common code, leaving arch_kexec_walk_mem() static (i.e. no longer
  replacable)
* always initialize kbuf.mem to zero to align with a change above
* set kbuf.buf_min/buf_max consistently between kexec and kdump
* try to consistently use "unsigned long" for physical (kexec-time)
  address, and "void *" for virtual (runtime) address in
  load_other_segments() with a couple of variables renamed for readability
* fix a 'sparse' warning against arch_kimage_file_post_load_cleanup()
* fix a calculation of string lengh of "ARM64_MAGIC"
* set kernel image alignment to MIN_KIMG_ALIGN rather than SZ_2M
* set elf header alignment to SZ_64K rather than SZ_4K


Changes in v11 (July 11, 2018)
* split v10's patch#3, a refactoring stuff, into two parts, "just move"
  and modify
* remove selecting BUILD_BIN2C from KEXEC_FILE config
* modify setup_dtb()
   * to correct a return value on failure of fdt_xyz() call,
   * to always remove existing bootargs and initrd-start/end properties,
     if any, when copying current system's dtb into new dtb
   * to use fdt_setprop_string() for bootargs (I'm now sure that
     kimage->cmdline_buf is a null-terminated string.)
* revise a warning comment in case of KEXEC_VERIFY_SIG but
  !(EFI && SIGNED_PE_FILE_VERIFICATION)

Changes in v10 (June 23, 2018)
* rebased to v4.18-rc
* change syscall numer of kexec_file_load from 292 to 293
* factor out memblock-based arch_kexec_walk_mem() from powerpc and
  merge it into generic one
* move generic fdt helper functions from arm64 dir to drivers/of
  (dt_root_[addr|size]_cells are no longer __initdata.)
* modify fill_property() to use 'while' loop
* modify fdt_setprop_reg() to allocate a buffer on stack
* modify setup_dtb() to use fdt_setprop_u64()
* pass kernel_load_addr/size directly as arguments, instead of via
  kimage_arch.kern_segment, at load_other_segments()
* refuse loading an image which cannot be supported in image loader,
  adding cpu-feature(MMFR0) helper functions
* modify prepare_elf_headers() to use kmalloc() instead of vmalloc()
* always pass arch.dtb_mem as the fourth argument to cpu_soft_restart()
  in machine_kexec() while dtb_mem will be zero in kexec case

Changes in v9 (April 25, 2018)
* rebased to v4.17-rc
* remove preparatory patches on generic/x86/ppc code
  They have now been merged in v4.17-rc1.
* allocate memory based on memblock list instead of system resources
  This will prevent reserved regions, particularly UEFI/ACPI data,
  from being corrupted.
* correct dt property names, linux,initrd-*, in newly-created dtb
  "linux," was missing.
* remove alignment requirement for initrd loading
* add kaslr (kernel virtual address randomization) support
* misc code clean-up
* revise commit messages

Changes in v8 (Feb 22, 2018)
* introduce ARCH_HAS_KEXEC_PURGATORY so that arm64 will be able to skip
  purgatory
* remove "ifdef CONFIG_X86_64" stuffs from a re-factored function,
  prepare_elf64_headers(), making its interface more generic
  (The original patch was split into two for easier reviews.)
* modify cpu_soft_restart() so as to let the 2nd kernel jump into its entry
  code directly without requiring purgatory in case of kexec_file_load
* remove CONFIG_KEXEC_FILE_IMAGE_FMT and introduce
  CONFIG_KEXEC_IMAGE_VERIFY_SIG, much similar to x86 but quite redundant
  for now.
* In addition, update/modify dependencies of KEXEC_IMAGE_VERIFY_SIG

Changes in v7 (Dec 4, 2017)
* rebased to v4.15-rc2
* re-organize the patch set to separate KEXEC_FILE_VERIFY_SIG-related
  code from the others
* revamp factored-out code in kernel/kexec_file.c due to the changes
  in original x86 code
* redefine walk_sys_ram_res_rev() prototype due to change of callback
  type in the counterpart, walk_sys_ram_res()
* make KEXEC_FILE_IMAGE_FMT default on if KEXEC_FILE selected

Changes in v6 (Oct 24, 2017)
* fix a for-loop bug in _kexec_kernel_image_probe() per Julien

Changes in v5 (Oct 10, 2017)
* fix kbuild errors around patch #3
per Julien's comments,
* fix a bug in walk_system_ram_res_rev() with some cleanup
* modify fdt_setprop_range() to use vmalloc()
* modify fill_property() to use memset()

Changes in v4 (Oct 2, 2017)
* reinstate x86's arch_kexec_kernel_image_load()
* rename weak arch_kexec_kernel_xxx() to _kexec_kernel_xxx() for
  better re-use
* constify kexec_file_loaders[]

Changes in v3 (Sep 15, 2017)
* fix kbuild test error
* factor out arch_kexec_kernel_*() & arch_kimage_file_post_load_cleanup()
* remove CONFIG_CRASH_CORE guard from kexec_file.c
* add vmapped kernel region to vmcore for gdb backtracing
  (see prepare_elf64_headers())
* merge asm/kexec_file.h into asm/kexec.h
* and some cleanups

Changes in v2 (Sep 8, 2017)
* move core-header-related functions from crash_core.c to kexec_file.c
* drop hash-check code from purgatory
* modify purgatory asm to remove arch_kexec_apply_relocations_add()
* drop older kernel support
* drop vmlinux support (at least, for this series)


Patch #1 to #10 are essential part for KEXEC_FILE support
(additionally allowing for IMA-based verification):
  Patch #1 to #6 are all preparatory patches on generic side.
  Patch #7 to #11 are to enable kexec_file_load on arm64.

Patch #12 to #13 are for KEXEC_VERIFY_SIG (arch-specific verification)
support

AKASHI Takahiro (16):
  asm-generic: add kexec_file_load system call to unistd.h
  kexec_file: make kexec_image_post_load_cleanup_default() global
  s390, kexec_file: drop arch_kexec_mem_walk()
  powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem()
  kexec_file: kexec_walk_memblock() only walks a dedicated region at
    kdump
  of/fdt: add helper functions for handling properties
  arm64: add image head flag definitions
  arm64: cpufeature: add MMFR0 helper functions
  arm64: enable KEXEC_FILE config
  arm64: kexec_file: load initrd and device-tree
  arm64: kexec_file: allow for loading Image-format kernel
  arm64: kexec_file: add crash dump support
  arm64: kexec_file: invoke the kernel without purgatory
  include: pe.h: remove message[] from mz header definition
  arm64: kexec_file: add kernel signature verification support
  arm64: kexec_file: add kaslr support

 arch/arm64/Kconfig                          |  33 ++
 arch/arm64/include/asm/boot.h               |  15 +
 arch/arm64/include/asm/cpufeature.h         |  48 +++
 arch/arm64/include/asm/kexec.h              |  49 +++
 arch/arm64/kernel/Makefile                  |   3 +-
 arch/arm64/kernel/cpu-reset.S               |   8 +-
 arch/arm64/kernel/head.S                    |   2 +-
 arch/arm64/kernel/kexec_image.c             | 123 ++++++++
 arch/arm64/kernel/machine_kexec.c           |  12 +-
 arch/arm64/kernel/machine_kexec_file.c      | 314 ++++++++++++++++++++
 arch/arm64/kernel/relocate_kernel.S         |   3 +-
 arch/powerpc/kernel/machine_kexec_file_64.c |  54 ----
 arch/s390/kernel/machine_kexec_file.c       |  10 -
 drivers/of/fdt.c                            |  62 +++-
 include/linux/kexec.h                       |   3 +-
 include/linux/of_fdt.h                      |  10 +-
 include/linux/pe.h                          |   2 +-
 include/uapi/asm-generic/unistd.h           |   4 +-
 kernel/kexec_file.c                         |  67 ++++-
 19 files changed, 738 insertions(+), 84 deletions(-)
 create mode 100644 arch/arm64/kernel/kexec_image.c
 create mode 100644 arch/arm64/kernel/machine_kexec_file.c

-- 
2.18.0


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

^ permalink raw reply

* [PATCH v12 01/16] asm-generic: add kexec_file_load system call to unistd.h
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, bhsharma, kexec, linux-kernel, AKASHI Takahiro,
	james.morse, linux-arm-kernel
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

The initial user of this system call number is arm64.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
---
 include/uapi/asm-generic/unistd.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 42990676a55e..c81f4a0df51f 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -734,9 +734,11 @@ __SYSCALL(__NR_pkey_free,     sys_pkey_free)
 __SYSCALL(__NR_statx,     sys_statx)
 #define __NR_io_pgetevents 292
 __SC_COMP(__NR_io_pgetevents, sys_io_pgetevents, compat_sys_io_pgetevents)
+#define __NR_kexec_file_load 293
+__SYSCALL(__NR_kexec_file_load,     sys_kexec_file_load)
 
 #undef __NR_syscalls
-#define __NR_syscalls 293
+#define __NR_syscalls 294
 
 /*
  * 32 bit systems traditionally used different
-- 
2.18.0


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kexec mailing list
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http://lists.infradead.org/mailman/listinfo/kexec

^ permalink raw reply related

* [PATCH v12 01/16] asm-generic: add kexec_file_load system call to unistd.h
From: AKASHI Takahiro @ 2018-07-24  6:57 UTC (permalink / raw)
  To: catalin.marinas, will.deacon, dhowells, vgoyal, herbert, davem,
	dyoung, bhe, arnd, schwidefsky, heiko.carstens
  Cc: ard.biesheuvel, james.morse, bhsharma, kexec, linux-arm-kernel,
	linux-kernel, AKASHI Takahiro
In-Reply-To: <20180724065759.19186-1-takahiro.akashi@linaro.org>

The initial user of this system call number is arm64.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
---
 include/uapi/asm-generic/unistd.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 42990676a55e..c81f4a0df51f 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -734,9 +734,11 @@ __SYSCALL(__NR_pkey_free,     sys_pkey_free)
 __SYSCALL(__NR_statx,     sys_statx)
 #define __NR_io_pgetevents 292
 __SC_COMP(__NR_io_pgetevents, sys_io_pgetevents, compat_sys_io_pgetevents)
+#define __NR_kexec_file_load 293
+__SYSCALL(__NR_kexec_file_load,     sys_kexec_file_load)
 
 #undef __NR_syscalls
-#define __NR_syscalls 293
+#define __NR_syscalls 294
 
 /*
  * 32 bit systems traditionally used different
-- 
2.18.0


^ permalink raw reply related

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