[PATCH v19 00/13] Carry forward IMA measurement log on kexec on ARM64

[PATCH v19 00/13] Carry forward IMA measurement log on kexec on ARM64

[Lakshmi Ramasubramanian]

On kexec file load Integrity Measurement Architecture (IMA) subsystem
may verify the IMA signature of the kernel and initramfs, and measure
it.  The command line parameters passed to the kernel in the kexec call
may also be measured by IMA.  A remote attestation service can verify
a TPM quote based on the TPM event log, the IMA measurement list, and
the TPM PCR data.  This can be achieved only if the IMA measurement log
is carried over from the current kernel to the next kernel across
the kexec call.

powerpc already supports carrying forward the IMA measurement log on
kexec.  This patch set adds support for carrying forward the IMA
measurement log on kexec on ARM64.

This patch set moves the platform independent code defined for powerpc
such that it can be reused for other platforms as well.  A chosen node
"linux,ima-kexec-buffer" is added to the DTB for ARM64 to hold
the address and the size of the memory reserved to carry
the IMA measurement log.

This patch set has been tested for ARM64 platform using QEMU.
I would like help from the community for testing this change on powerpc.
Thanks.

This patch set is based on
commit f31e3386a4e9 ("ima: Free IMA measurement buffer after kexec syscall")
in https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
"ima-kexec-fixes" branch.

Changelog:

v19
  - Moved ELF related fields from "struct kimage_arch" for x86, arm64,
    and powerpc architectures to "struct kimage".

v18
  - Added a parameter to of_kexec_alloc_and_setup_fdt() for the caller
    to specify additional space needed for the FDT buffer
  - Renamed arm64 and powerpc ELF buffer address field in
    "struct kimage_arch" to elf_load_addr to match x86_64 name.
  - Removed of_ima_add_kexec_buffer() and instead directly set
    ima_buffer_addr and ima_buffer_size in ima_add_kexec_buffer()
  - Moved FDT_EXTRA_SPACE definition from include/linux/of.h to
    drivers/of/kexec.c

v17
  - Renamed of_kexec_setup_new_fdt() to of_kexec_alloc_and_setup_fdt(),
    and moved memory allocation for the new FDT to this function.

v16
  - Defined functions to allocate and free buffer for FDT for powerpc
    and arm64.
  - Moved ima_buffer_addr and ima_buffer_size fields from
    "struct kimage_arch" in powerpc to "struct kimage"
v15
  - Included Rob's patches in the patch set, and rebased
    the changes to "next-integrity" branch.
  - Allocate memory for DTB, on arm64, using kmalloc() instead of
    vmalloc() to keep it consistent with powerpc implementation.
  - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
    remove setup_new_fdt() in the same patch to keep it bisect safe.

v14
  - Select CONFIG_HAVE_IMA_KEXEC for CONFIG_KEXEC_FILE, for powerpc
    and arm64, if CONFIG_IMA is enabled.
  - Use IS_ENABLED() macro instead of "#ifdef" in remove_ima_buffer(),
    ima_get_kexec_buffer(), and ima_free_kexec_buffer().
  - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
    remove setup_new_fdt() in "arch/powerpc/kexec/file_load.c".

v13
  - Moved the arch independent functions to drivers/of/kexec.c
    and then refactored the code.
  - Moved arch_ima_add_kexec_buffer() to
    security/integrity/ima/ima_kexec.c

v12
  - Use fdt_appendprop_addrrange() in setup_ima_buffer()
    to setup the IMA measurement list property in
    the device tree.
  - Moved architecture independent functions from
    "arch/powerpc/kexec/ima.c" to "drivers/of/kexec."
  - Deleted "arch/powerpc/kexec/ima.c" and
    "arch/powerpc/include/asm/ima.h".

v11
  - Rebased the changes on the kexec code refactoring done by
    Rob Herring in his "dt/kexec" branch
  - Removed "extern" keyword in function declarations
  - Removed unnecessary header files included in C files
  - Updated patch descriptions per Thiago's comments

v10
  - Moved delete_fdt_mem_rsv(), remove_ima_buffer(),
    get_ima_kexec_buffer, and get_root_addr_size_cells()
    to drivers/of/kexec.c
  - Moved arch_ima_add_kexec_buffer() to
    security/integrity/ima/ima_kexec.c
  - Conditionally define IMA buffer fields in struct kimage_arch

v9
  - Moved delete_fdt_mem_rsv() to drivers/of/kexec_fdt.c
  - Defined a new function get_ima_kexec_buffer() in
    drivers/of/ima_kexec.c to replace do_get_kexec_buffer()
  - Changed remove_ima_kexec_buffer() to the original function name
    remove_ima_buffer()
  - Moved remove_ima_buffer() to drivers/of/ima_kexec.c
  - Moved ima_get_kexec_buffer() and ima_free_kexec_buffer()
    to security/integrity/ima/ima_kexec.c

v8:
  - Moved remove_ima_kexec_buffer(), do_get_kexec_buffer(), and
    delete_fdt_mem_rsv() to drivers/of/fdt.c
  - Moved ima_dump_measurement_list() and ima_add_kexec_buffer()
    back to security/integrity/ima/ima_kexec.c

v7:
  - Renamed remove_ima_buffer() to remove_ima_kexec_buffer() and moved
    this function definition to kernel.
  - Moved delete_fdt_mem_rsv() definition to kernel
  - Moved ima_dump_measurement_list() and ima_add_kexec_buffer() to
    a new file namely ima_kexec_fdt.c in IMA

v6:
  - Remove any existing FDT_PROP_IMA_KEXEC_BUFFER property in the device
    tree and also its corresponding memory reservation in the currently
    running kernel.
  - Moved the function remove_ima_buffer() defined for powerpc to IMA
    and renamed the function to ima_remove_kexec_buffer(). Also, moved
    delete_fdt_mem_rsv() from powerpc to IMA.

v5:
  - Merged get_addr_size_cells() and do_get_kexec_buffer() into a single
    function when moving the arch independent code from powerpc to IMA
  - Reverted the change to use FDT functions in powerpc code and added
    back the original code in get_addr_size_cells() and
    do_get_kexec_buffer() for powerpc.
  - Added fdt_add_mem_rsv() for ARM64 to reserve the memory for
    the IMA log buffer during kexec.
  - Fixed the warning reported by kernel test bot for ARM64
    arch_ima_add_kexec_buffer() - moved this function to a new file
    namely arch/arm64/kernel/ima_kexec.c

v4:
  - Submitting the patch series on behalf of the original author
    Prakhar Srivastava <prsriva@linux.microsoft.com>
  - Moved FDT_PROP_IMA_KEXEC_BUFFER ("linux,ima-kexec-buffer") to
    libfdt.h so that it can be shared by multiple platforms.

v3:
Breakup patches further into separate patches.
  - Refactoring non architecture specific code out of powerpc
  - Update powerpc related code to use fdt functions
  - Update IMA buffer read related code to use of functions
  - Add support to store the memory information of the IMA
    measurement logs to be carried forward.
  - Update the property strings to align with documented nodes
    https://github.com/devicetree-org/dt-schema/pull/46

v2:
  Break patches into separate patches.
  - Powerpc related Refactoring
  - Updating the docuemntation for chosen node
  - Updating arm64 to support IMA buffer pass

v1:
  Refactoring carrying over IMA measuremnet logs over Kexec. This patch
    moves the non-architecture specific code out of powerpc and adds to
    security/ima.(Suggested by Thiago)
  Add Documentation regarding the ima-kexec-buffer node in the chosen
    node documentation

v0:
  Add a layer of abstraction to use the memory reserved by device tree
    for ima buffer pass.
  Add support for ima buffer pass using reserved memory for arm64 kexec.
    Update the arch sepcific code path in kexec file load to store the
    ima buffer in the reserved memory. The same reserved memory is read
    on kexec or cold boot.

Lakshmi Ramasubramanian (10):
  kexec: Move ELF fields to struct kimage
  arm64: Use ELF fields defined in 'struct kimage'
  powerpc: Use ELF fields defined in 'struct kimage'
  x86: Use ELF fields defined in 'struct kimage'
  powerpc: Move ima buffer fields to struct kimage
  powerpc: Enable passing IMA log to next kernel on kexec
  powerpc: Move arch independent ima kexec functions to
    drivers/of/kexec.c
  kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
  powerpc: Delete unused function delete_fdt_mem_rsv()
  arm64: Enable passing IMA log to next kernel on kexec

Rob Herring (3):
  of: Add a common kexec FDT setup function
  arm64: Use common of_kexec_alloc_and_setup_fdt()
  powerpc: Use common of_kexec_alloc_and_setup_fdt()

 arch/arm64/Kconfig                     |   1 +
 arch/arm64/include/asm/kexec.h         |   4 -
 arch/arm64/kernel/machine_kexec_file.c | 194 +----------
 arch/powerpc/Kconfig                   |   2 +-
 arch/powerpc/include/asm/ima.h         |  30 --
 arch/powerpc/include/asm/kexec.h       |  14 +-
 arch/powerpc/kexec/Makefile            |   7 -
 arch/powerpc/kexec/elf_64.c            |  30 +-
 arch/powerpc/kexec/file_load.c         | 183 +---------
 arch/powerpc/kexec/file_load_64.c      |  21 +-
 arch/powerpc/kexec/ima.c               | 219 ------------
 arch/x86/include/asm/kexec.h           |   5 -
 arch/x86/kernel/crash.c                |  14 +-
 arch/x86/kernel/kexec-bzimage64.c      |   2 +-
 arch/x86/kernel/machine_kexec_64.c     |   4 +-
 drivers/of/Makefile                    |   6 +
 drivers/of/kexec.c                     | 458 +++++++++++++++++++++++++
 include/linux/kexec.h                  |   8 +
 include/linux/of.h                     |   7 +
 security/integrity/ima/ima.h           |   4 -
 security/integrity/ima/ima_kexec.c     |   9 +-
 21 files changed, 539 insertions(+), 683 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/ima.h
 delete mode 100644 arch/powerpc/kexec/ima.c
 create mode 100644 drivers/of/kexec.c

-- 
2.30.0


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[PATCH v19 01/13] kexec: Move ELF fields to struct kimage

[Lakshmi Ramasubramanian]

ELF related fields elf_headers, elf_headers_sz, and elf_load_addr are
defined in architecture specific 'struct kimage_arch' for x86, powerpc,
and arm64.  The name of these fields are different in these
architectures that makes it hard to have a common code for setting up
the device tree for kexec system call.

Move the ELF fields to 'struct kimage' defined in include/linux/kexec.h
so common code can use it.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")
Reported-by: kernel test robot <lkp@intel.com>
---
 include/linux/kexec.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 5f61389f5f36..0208fe8f8e42 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -305,6 +305,11 @@ struct kimage {
 	/* Virtual address of IMA measurement buffer for kexec syscall */
 	void *ima_buffer;
 #endif
+
+	/* Core ELF header buffer */
+	void *elf_headers;
+	unsigned long elf_headers_sz;
+	unsigned long elf_load_addr;
 };
 
 /* kexec interface functions */
-- 
2.30.0


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Re: [PATCH v19 01/13] kexec: Move ELF fields to struct kimage

[Thiago Jung Bauermann]

Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> ELF related fields elf_headers, elf_headers_sz, and elf_load_addr are
> defined in architecture specific 'struct kimage_arch' for x86, powerpc,
> and arm64.  The name of these fields are different in these
> architectures that makes it hard to have a common code for setting up
> the device tree for kexec system call.
>
> Move the ELF fields to 'struct kimage' defined in include/linux/kexec.h
> so common code can use it.
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")

This Fixes tag should be removed. It is referencing a patch from the
future (later in the series), and the commit id is meaningless.

> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  include/linux/kexec.h | 5 +++++
>  1 file changed, 5 insertions(+)

With that fixed:

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

-- 
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IBM Linux Technology Center

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[PATCH v19 02/13] arm64: Use ELF fields defined in 'struct kimage'

[Lakshmi Ramasubramanian]

ELF related fields elf_headers, elf_headers_sz, and elf_headers_mem
have been moved from 'struct kimage_arch' to 'struct kimage' as
elf_headers, elf_headers_sz, and elf_load_addr respectively.

Use the ELF fields defined in 'struct kimage'.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")
Reported-by: kernel test robot <lkp@intel.com>
---
 arch/arm64/include/asm/kexec.h         |  4 ----
 arch/arm64/kernel/machine_kexec_file.c | 18 +++++++++---------
 2 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
index d24b527e8c00..12a561a54128 100644
--- a/arch/arm64/include/asm/kexec.h
+++ b/arch/arm64/include/asm/kexec.h
@@ -96,10 +96,6 @@ static inline void crash_post_resume(void) {}
 struct kimage_arch {
 	void *dtb;
 	unsigned long dtb_mem;
-	/* Core ELF header buffer */
-	void *elf_headers;
-	unsigned long elf_headers_mem;
-	unsigned long elf_headers_sz;
 };
 
 extern const struct kexec_file_ops kexec_image_ops;
diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 03210f644790..5553de3d401a 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -43,9 +43,9 @@ 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;
+	vfree(image->elf_headers);
+	image->elf_headers = NULL;
+	image->elf_headers_sz = 0;
 
 	return kexec_image_post_load_cleanup_default(image);
 }
@@ -73,8 +73,8 @@ static int setup_dtb(struct kimage *image,
 		/* add linux,elfcorehdr */
 		ret = fdt_appendprop_addrrange(dtb, 0, off,
 				FDT_PROP_KEXEC_ELFHDR,
-				image->arch.elf_headers_mem,
-				image->arch.elf_headers_sz);
+				image->elf_load_addr,
+				image->elf_headers_sz);
 		if (ret)
 			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
 
@@ -282,12 +282,12 @@ int load_other_segments(struct kimage *image,
 			vfree(headers);
 			goto out_err;
 		}
-		image->arch.elf_headers = headers;
-		image->arch.elf_headers_mem = kbuf.mem;
-		image->arch.elf_headers_sz = headers_sz;
+		image->elf_headers = headers;
+		image->elf_load_addr = kbuf.mem;
+		image->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, kbuf.bufsz, kbuf.memsz);
+			 image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
 	}
 
 	/* load initrd */
-- 
2.30.0


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Re: [PATCH v19 02/13] arm64: Use ELF fields defined in 'struct kimage'

[Thiago Jung Bauermann]

Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> ELF related fields elf_headers, elf_headers_sz, and elf_headers_mem
> have been moved from 'struct kimage_arch' to 'struct kimage' as
> elf_headers, elf_headers_sz, and elf_load_addr respectively.
>
> Use the ELF fields defined in 'struct kimage'.
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")

This Fixes tag should be removed. It is referencing a patch from the
future (later in the series), and the commit id is meaningless.

> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  arch/arm64/include/asm/kexec.h         |  4 ----
>  arch/arm64/kernel/machine_kexec_file.c | 18 +++++++++---------
>  2 files changed, 9 insertions(+), 13 deletions(-)

With that fixed:

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

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[PATCH v19 03/13] powerpc: Use ELF fields defined in 'struct kimage'

[Lakshmi Ramasubramanian]

ELF related fields elf_headers, elf_headers_sz, and elfcorehdr_addr
have been moved from 'struct kimage_arch' to 'struct kimage' as
elf_headers, elf_headers_sz, and elf_load_addr respectively.

Use the ELF fields defined in 'struct kimage'.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")
Reported-by: kernel test robot <lkp@intel.com>
---
 arch/powerpc/include/asm/kexec.h  |  4 ----
 arch/powerpc/kexec/file_load.c    |  6 +++---
 arch/powerpc/kexec/file_load_64.c | 14 +++++++-------
 3 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 55d6ede30c19..69c2a8aa142a 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -108,10 +108,6 @@ struct kimage_arch {
 	unsigned long backup_start;
 	void *backup_buf;
 
-	unsigned long elfcorehdr_addr;
-	unsigned long elf_headers_sz;
-	void *elf_headers;
-
 #ifdef CONFIG_IMA_KEXEC
 	phys_addr_t ima_buffer_addr;
 	size_t ima_buffer_size;
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 9a232bc36c8f..19d2c5f49daf 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -45,7 +45,7 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 		return NULL;
 
 	elfcorehdr_strlen = sprintf(cmdline_ptr, "elfcorehdr=0x%lx ",
-				    image->arch.elfcorehdr_addr);
+				    image->elf_load_addr);
 
 	if (elfcorehdr_strlen + cmdline_len > COMMAND_LINE_SIZE) {
 		pr_err("Appending elfcorehdr=<addr> exceeds cmdline size\n");
@@ -263,8 +263,8 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		 * Avoid elfcorehdr from being stomped on in kdump kernel by
 		 * setting up memory reserve map.
 		 */
-		ret = fdt_add_mem_rsv(fdt, image->arch.elfcorehdr_addr,
-				      image->arch.elf_headers_sz);
+		ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,
+				      image->elf_headers_sz);
 		if (ret) {
 			pr_err("Error reserving elfcorehdr memory: %s\n",
 			       fdt_strerror(ret));
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index c69bcf9b547a..4350f225bb67 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -815,9 +815,9 @@ static int load_elfcorehdr_segment(struct kimage *image, struct kexec_buf *kbuf)
 		goto out;
 	}
 
-	image->arch.elfcorehdr_addr = kbuf->mem;
-	image->arch.elf_headers_sz = headers_sz;
-	image->arch.elf_headers = headers;
+	image->elf_load_addr = kbuf->mem;
+	image->elf_headers_sz = headers_sz;
+	image->elf_headers = headers;
 out:
 	kfree(cmem);
 	return ret;
@@ -851,7 +851,7 @@ int load_crashdump_segments_ppc64(struct kimage *image,
 		return ret;
 	}
 	pr_debug("Loaded elf core header at 0x%lx, bufsz=0x%lx memsz=0x%lx\n",
-		 image->arch.elfcorehdr_addr, kbuf->bufsz, kbuf->memsz);
+		 image->elf_load_addr, kbuf->bufsz, kbuf->memsz);
 
 	return 0;
 }
@@ -1107,9 +1107,9 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	vfree(image->arch.backup_buf);
 	image->arch.backup_buf = NULL;
 
-	vfree(image->arch.elf_headers);
-	image->arch.elf_headers = NULL;
-	image->arch.elf_headers_sz = 0;
+	vfree(image->elf_headers);
+	image->elf_headers = NULL;
+	image->elf_headers_sz = 0;
 
 	return kexec_image_post_load_cleanup_default(image);
 }
-- 
2.30.0


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Re: [PATCH v19 03/13] powerpc: Use ELF fields defined in 'struct kimage'

[Thiago Jung Bauermann]

Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> ELF related fields elf_headers, elf_headers_sz, and elfcorehdr_addr
> have been moved from 'struct kimage_arch' to 'struct kimage' as
> elf_headers, elf_headers_sz, and elf_load_addr respectively.
>
> Use the ELF fields defined in 'struct kimage'.
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")

This Fixes tag should be removed. It is referencing a patch from the
future (later in the series), and the commit id is meaningless.

> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  arch/powerpc/include/asm/kexec.h  |  4 ----
>  arch/powerpc/kexec/file_load.c    |  6 +++---
>  arch/powerpc/kexec/file_load_64.c | 14 +++++++-------
>  3 files changed, 10 insertions(+), 14 deletions(-)

With that fixed:

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

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[PATCH v19 04/13] x86: Use ELF fields defined in 'struct kimage'

[Lakshmi Ramasubramanian]

ELF related fields elf_headers, elf_headers_sz, and elf_load_addr
have been moved from 'struct kimage_arch' to 'struct kimage'.

Use the ELF fields defined in 'struct kimage'.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")
Reported-by: kernel test robot <lkp@intel.com>
---
 arch/x86/include/asm/kexec.h       |  5 -----
 arch/x86/kernel/crash.c            | 14 +++++++-------
 arch/x86/kernel/kexec-bzimage64.c  |  2 +-
 arch/x86/kernel/machine_kexec_64.c |  4 ++--
 4 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
index 6802c59e8252..0a6e34b07017 100644
--- a/arch/x86/include/asm/kexec.h
+++ b/arch/x86/include/asm/kexec.h
@@ -150,11 +150,6 @@ struct kimage_arch {
 	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
-
-	/* Core ELF header buffer */
-	void *elf_headers;
-	unsigned long elf_headers_sz;
-	unsigned long elf_load_addr;
 };
 #endif /* CONFIG_X86_32 */
 
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index a8f3af257e26..9d0722fb8842 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -323,8 +323,8 @@ static int memmap_exclude_ranges(struct kimage *image, struct crash_mem *cmem,
 	cmem->nr_ranges = 1;
 
 	/* Exclude elf header region */
-	start = image->arch.elf_load_addr;
-	end = start + image->arch.elf_headers_sz - 1;
+	start = image->elf_load_addr;
+	end = start + image->elf_headers_sz - 1;
 	return crash_exclude_mem_range(cmem, start, end);
 }
 
@@ -407,20 +407,20 @@ int crash_load_segments(struct kimage *image)
 	if (ret)
 		return ret;
 
-	image->arch.elf_headers = kbuf.buffer;
-	image->arch.elf_headers_sz = kbuf.bufsz;
+	image->elf_headers = kbuf.buffer;
+	image->elf_headers_sz = kbuf.bufsz;
 
 	kbuf.memsz = kbuf.bufsz;
 	kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
 	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
 	ret = kexec_add_buffer(&kbuf);
 	if (ret) {
-		vfree((void *)image->arch.elf_headers);
+		vfree((void *)image->elf_headers);
 		return ret;
 	}
-	image->arch.elf_load_addr = kbuf.mem;
+	image->elf_load_addr = kbuf.mem;
 	pr_debug("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
-		 image->arch.elf_load_addr, kbuf.bufsz, kbuf.bufsz);
+		 image->elf_load_addr, kbuf.bufsz, kbuf.bufsz);
 
 	return ret;
 }
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index ce831f9448e7..170d0fd68b1f 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -75,7 +75,7 @@ static int setup_cmdline(struct kimage *image, struct boot_params *params,
 
 	if (image->type == KEXEC_TYPE_CRASH) {
 		len = sprintf(cmdline_ptr,
-			"elfcorehdr=0x%lx ", image->arch.elf_load_addr);
+			"elfcorehdr=0x%lx ", image->elf_load_addr);
 	}
 	memcpy(cmdline_ptr + len, cmdline, cmdline_len);
 	cmdline_len += len;
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index a29a44a98e5b..055c18a6f7bf 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -402,8 +402,8 @@ void machine_kexec(struct kimage *image)
 #ifdef CONFIG_KEXEC_FILE
 void *arch_kexec_kernel_image_load(struct kimage *image)
 {
-	vfree(image->arch.elf_headers);
-	image->arch.elf_headers = NULL;
+	vfree(image->elf_headers);
+	image->elf_headers = NULL;
 
 	if (!image->fops || !image->fops->load)
 		return ERR_PTR(-ENOEXEC);
-- 
2.30.0


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Re: [PATCH v19 04/13] x86: Use ELF fields defined in 'struct kimage'

[Thiago Jung Bauermann]

Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> ELF related fields elf_headers, elf_headers_sz, and elf_load_addr
> have been moved from 'struct kimage_arch' to 'struct kimage'.
>
> Use the ELF fields defined in 'struct kimage'.
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")

Same thing. :-)

> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  arch/x86/include/asm/kexec.h       |  5 -----
>  arch/x86/kernel/crash.c            | 14 +++++++-------
>  arch/x86/kernel/kexec-bzimage64.c  |  2 +-
>  arch/x86/kernel/machine_kexec_64.c |  4 ++--
>  4 files changed, 10 insertions(+), 15 deletions(-)

With that fixed:

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

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Re: [PATCH v19 04/13] x86: Use ELF fields defined in 'struct kimage'

[Thiago Jung Bauermann]

Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> ELF related fields elf_headers, elf_headers_sz, and elf_load_addr
> have been moved from 'struct kimage_arch' to 'struct kimage'.
>
> Use the ELF fields defined in 'struct kimage'.
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")

Ditto.

> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  arch/x86/include/asm/kexec.h       |  5 -----
>  arch/x86/kernel/crash.c            | 14 +++++++-------
>  arch/x86/kernel/kexec-bzimage64.c  |  2 +-
>  arch/x86/kernel/machine_kexec_64.c |  4 ++--
>  4 files changed, 10 insertions(+), 15 deletions(-)

With that fixed:

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

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[PATCH v19 05/13] of: Add a common kexec FDT setup function

[Lakshmi Ramasubramanian]

From: Rob Herring <robh@kernel.org>

Both arm64 and powerpc do essentially the same FDT /chosen setup for
kexec.  The differences are either omissions that arm64 should have
or additional properties that will be ignored.  The setup code can be
combined and shared by both powerpc and arm64.

The differences relative to the arm64 version:
 - If /chosen doesn't exist, it will be created (should never happen).
 - Any old dtb and initrd reserved memory will be released.
 - The new initrd and elfcorehdr are marked reserved.
 - "linux,booted-from-kexec" is set.

The differences relative to the powerpc version:
 - "kaslr-seed" and "rng-seed" may be set.
 - "linux,elfcorehdr" is set.
 - Any existing "linux,usable-memory-range" is removed.

Combine the code for setting up the /chosen node in the FDT and updating
the memory reservation for kexec, for powerpc and arm64, in
of_kexec_alloc_and_setup_fdt() and move it to "drivers/of/kexec.c".

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")
Reported-by: kernel test robot <lkp@intel.com>
---
 drivers/of/Makefile |   6 +
 drivers/of/kexec.c  | 265 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of.h  |   5 +
 3 files changed, 276 insertions(+)
 create mode 100644 drivers/of/kexec.c

diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 6e1e5212f058..c13b982084a3 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -14,4 +14,10 @@ obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
 obj-$(CONFIG_OF_NUMA) += of_numa.o
 
+ifdef CONFIG_KEXEC_FILE
+ifdef CONFIG_OF_FLATTREE
+obj-y	+= kexec.o
+endif
+endif
+
 obj-$(CONFIG_OF_UNITTEST) += unittest-data/
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
new file mode 100644
index 000000000000..8fa8946cda42
--- /dev/null
+++ b/drivers/of/kexec.c
@@ -0,0 +1,265 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Arm Limited
+ *
+ * Based on arch/arm64/kernel/machine_kexec_file.c:
+ *  Copyright (C) 2018 Linaro Limited
+ *
+ * And arch/powerpc/kexec/file_load.c:
+ *  Copyright (C) 2016  IBM Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/libfdt.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/random.h>
+#include <linux/types.h>
+
+/* relevant device tree properties */
+#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
+#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
+#define FDT_PROP_INITRD_START	"linux,initrd-start"
+#define FDT_PROP_INITRD_END	"linux,initrd-end"
+#define FDT_PROP_BOOTARGS	"bootargs"
+#define FDT_PROP_KASLR_SEED	"kaslr-seed"
+#define FDT_PROP_RNG_SEED	"rng-seed"
+#define RNG_SEED_SIZE		128
+
+/*
+ * Additional space needed for the FDT buffer so that we can add initrd,
+ * bootargs, kaslr-seed, rng-seed, useable-memory-range and elfcorehdr.
+ */
+#define FDT_EXTRA_SPACE 0x1000
+
+/**
+ * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
+ *
+ * @fdt:	Flattened device tree for the current kernel.
+ * @start:	Starting address of the reserved memory.
+ * @size:	Size of the reserved memory.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned long size)
+{
+	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
+
+	for (i = 0; i < num_rsvs; i++) {
+		u64 rsv_start, rsv_size;
+
+		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
+		if (ret) {
+			pr_err("Malformed device tree.\n");
+			return -EINVAL;
+		}
+
+		if (rsv_start == start && rsv_size == size) {
+			ret = fdt_del_mem_rsv(fdt, i);
+			if (ret) {
+				pr_err("Error deleting device tree reservation.\n");
+				return -EINVAL;
+			}
+
+			return 0;
+		}
+	}
+
+	return -ENOENT;
+}
+
+/*
+ * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
+ *
+ * @image:		kexec image being loaded.
+ * @initrd_load_addr:	Address where the next initrd will be loaded.
+ * @initrd_len:		Size of the next initrd, or 0 if there will be none.
+ * @cmdline:		Command line for the next kernel, or NULL if there will
+ *			be none.
+ * @extra_fdt_size:	Additional size for the new FDT buffer.
+ *
+ * Return: fdt on success, or NULL errno on error.
+ */
+void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
+				   unsigned long initrd_load_addr,
+				   unsigned long initrd_len,
+				   const char *cmdline, size_t extra_fdt_size)
+{
+	void *fdt;
+	int ret, chosen_node;
+	const void *prop;
+	size_t fdt_size;
+
+	fdt_size = fdt_totalsize(initial_boot_params) +
+		   (cmdline ? strlen(cmdline) : 0) +
+		   FDT_EXTRA_SPACE +
+		   extra_fdt_size;
+	fdt = kvmalloc(fdt_size, GFP_KERNEL);
+	if (!fdt)
+		return NULL;
+
+	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
+	if (ret < 0) {
+		pr_err("Error %d setting up the new device tree.\n", ret);
+		goto out;
+	}
+
+	/* Remove memory reservation for the current device tree. */
+	ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
+				       fdt_totalsize(initial_boot_params));
+	if (ret == -EINVAL) {
+		pr_err("Error removing memory reservation.\n");
+		goto out;
+	}
+
+	chosen_node = fdt_path_offset(fdt, "/chosen");
+	if (chosen_node == -FDT_ERR_NOTFOUND)
+		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
+					      "chosen");
+	if (chosen_node < 0) {
+		ret = chosen_node;
+		goto out;
+	}
+
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KEXEC_ELFHDR);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_MEM_RANGE);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+
+	/* Did we boot using an initrd? */
+	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
+	if (prop) {
+		u64 tmp_start, tmp_end, tmp_size;
+
+		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
+		if (!prop) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		/*
+		 * kexec reserves exact initrd size, while firmware may
+		 * reserve a multiple of PAGE_SIZE, so check for both.
+		 */
+		tmp_size = tmp_end - tmp_start;
+		ret = fdt_find_and_del_mem_rsv(fdt, tmp_start, tmp_size);
+		if (ret == -ENOENT)
+			ret = fdt_find_and_del_mem_rsv(fdt, tmp_start,
+						       round_up(tmp_size, PAGE_SIZE));
+		if (ret == -EINVAL)
+			goto out;
+	}
+
+	/* add initrd-* */
+	if (initrd_load_addr) {
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_START,
+				      initrd_load_addr);
+		if (ret)
+			goto out;
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_END,
+				      initrd_load_addr + initrd_len);
+		if (ret)
+			goto out;
+
+		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
+		if (ret)
+			goto out;
+
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_START);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_END);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	if (image->type == KEXEC_TYPE_CRASH) {
+		/* add linux,elfcorehdr */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_KEXEC_ELFHDR,
+				image->elf_load_addr,
+				image->elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/*
+		 * Avoid elfcorehdr from being stomped on in kdump kernel by
+		 * setting up memory reserve map.
+		 */
+		ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,
+				      image->elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/* add linux,usable-memory-range */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_MEM_RANGE,
+				crashk_res.start,
+				crashk_res.end - crashk_res.start + 1);
+		if (ret)
+			goto out;
+	}
+
+	/* add bootargs */
+	if (cmdline) {
+		ret = fdt_setprop_string(fdt, chosen_node, FDT_PROP_BOOTARGS, cmdline);
+		if (ret)
+			goto out;
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_BOOTARGS);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	/* add kaslr-seed */
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KASLR_SEED);
+	if (ret == -FDT_ERR_NOTFOUND)
+		ret = 0;
+	else if (ret)
+		goto out;
+
+	if (rng_is_initialized()) {
+		u64 seed = get_random_u64();
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_KASLR_SEED, seed);
+		if (ret)
+			goto out;
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_KASLR_SEED);
+	}
+
+	/* add rng-seed */
+	if (rng_is_initialized()) {
+		void *rng_seed;
+
+		ret = fdt_setprop_placeholder(fdt, chosen_node, FDT_PROP_RNG_SEED,
+				RNG_SEED_SIZE, &rng_seed);
+		if (ret)
+			goto out;
+		get_random_bytes(rng_seed, RNG_SEED_SIZE);
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_RNG_SEED);
+	}
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+
+out:
+	if (ret) {
+		kvfree(fdt);
+		fdt = NULL;
+	}
+
+	return fdt;
+}
diff --git a/include/linux/of.h b/include/linux/of.h
index 4b27c9a27df3..d66c915df910 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -560,6 +560,11 @@ int of_map_id(struct device_node *np, u32 id,
 
 phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
 
+struct kimage;
+void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
+				   unsigned long initrd_load_addr,
+				   unsigned long initrd_len,
+				   const char *cmdline, size_t extra_fdt_size);
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
-- 
2.30.0


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Re: [PATCH v19 05/13] of: Add a common kexec FDT setup function

[Thiago Jung Bauermann]

Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> From: Rob Herring <robh@kernel.org>
>
> Both arm64 and powerpc do essentially the same FDT /chosen setup for
> kexec.  The differences are either omissions that arm64 should have
> or additional properties that will be ignored.  The setup code can be
> combined and shared by both powerpc and arm64.
>
> The differences relative to the arm64 version:
>  - If /chosen doesn't exist, it will be created (should never happen).
>  - Any old dtb and initrd reserved memory will be released.
>  - The new initrd and elfcorehdr are marked reserved.
>  - "linux,booted-from-kexec" is set.
>
> The differences relative to the powerpc version:
>  - "kaslr-seed" and "rng-seed" may be set.
>  - "linux,elfcorehdr" is set.
>  - Any existing "linux,usable-memory-range" is removed.
>
> Combine the code for setting up the /chosen node in the FDT and updating
> the memory reservation for kexec, for powerpc and arm64, in
> of_kexec_alloc_and_setup_fdt() and move it to "drivers/of/kexec.c".
>
> Signed-off-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")

A patch cannot fix itself. The world would be a much better place if it
could. :-)

> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  drivers/of/Makefile |   6 +
>  drivers/of/kexec.c  | 265 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/of.h  |   5 +
>  3 files changed, 276 insertions(+)
>  create mode 100644 drivers/of/kexec.c

With that fixed:

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

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Re: [PATCH v19 05/13] of: Add a common kexec FDT setup function

[Lakshmi Ramasubramanian]

On 2/23/21 5:20 PM, Thiago Jung Bauermann wrote:
> 
> Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:
> 
>> From: Rob Herring <robh@kernel.org>
>>
>> Both arm64 and powerpc do essentially the same FDT /chosen setup for
>> kexec.  The differences are either omissions that arm64 should have
>> or additional properties that will be ignored.  The setup code can be
>> combined and shared by both powerpc and arm64.
>>
>> The differences relative to the arm64 version:
>>   - If /chosen doesn't exist, it will be created (should never happen).
>>   - Any old dtb and initrd reserved memory will be released.
>>   - The new initrd and elfcorehdr are marked reserved.
>>   - "linux,booted-from-kexec" is set.
>>
>> The differences relative to the powerpc version:
>>   - "kaslr-seed" and "rng-seed" may be set.
>>   - "linux,elfcorehdr" is set.
>>   - Any existing "linux,usable-memory-range" is removed.
>>
>> Combine the code for setting up the /chosen node in the FDT and updating
>> the memory reservation for kexec, for powerpc and arm64, in
>> of_kexec_alloc_and_setup_fdt() and move it to "drivers/of/kexec.c".
>>
>> Signed-off-by: Rob Herring <robh@kernel.org>
>> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")
> 
> A patch cannot fix itself. The world would be a much better place if it
> could. :-)

:)

> 
>> Reported-by: kernel test robot <lkp@intel.com>
>> ---
>>   drivers/of/Makefile |   6 +
>>   drivers/of/kexec.c  | 265 ++++++++++++++++++++++++++++++++++++++++++++
>>   include/linux/of.h  |   5 +
>>   3 files changed, 276 insertions(+)
>>   create mode 100644 drivers/of/kexec.c
> 
> With that fixed:
> 
> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

Thanks for reviewing the patches Thiago.

  -lakshmi



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Re: [PATCH v19 05/13] of: Add a common kexec FDT setup function

[Geert Uytterhoeven]

Hi Lakshmi and Rob,

On Sun, Feb 21, 2021 at 6:52 PM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
> From: Rob Herring <robh@kernel.org>
>
> Both arm64 and powerpc do essentially the same FDT /chosen setup for
> kexec.  The differences are either omissions that arm64 should have
> or additional properties that will be ignored.  The setup code can be
> combined and shared by both powerpc and arm64.
>
> The differences relative to the arm64 version:
>  - If /chosen doesn't exist, it will be created (should never happen).
>  - Any old dtb and initrd reserved memory will be released.
>  - The new initrd and elfcorehdr are marked reserved.
>  - "linux,booted-from-kexec" is set.
>
> The differences relative to the powerpc version:
>  - "kaslr-seed" and "rng-seed" may be set.
>  - "linux,elfcorehdr" is set.
>  - Any existing "linux,usable-memory-range" is removed.
>
> Combine the code for setting up the /chosen node in the FDT and updating
> the memory reservation for kexec, for powerpc and arm64, in
> of_kexec_alloc_and_setup_fdt() and move it to "drivers/of/kexec.c".
>
> Signed-off-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>

> --- /dev/null
> +++ b/drivers/of/kexec.c

> +/*
> + * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
> + *
> + * @image:             kexec image being loaded.
> + * @initrd_load_addr:  Address where the next initrd will be loaded.
> + * @initrd_len:                Size of the next initrd, or 0 if there will be none.
> + * @cmdline:           Command line for the next kernel, or NULL if there will
> + *                     be none.
> + * @extra_fdt_size:    Additional size for the new FDT buffer.
> + *
> + * Return: fdt on success, or NULL errno on error.
> + */
> +void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
> +                                  unsigned long initrd_load_addr,
> +                                  unsigned long initrd_len,
> +                                  const char *cmdline, size_t extra_fdt_size)
> +{

> +       /* Did we boot using an initrd? */
> +       prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
> +       if (prop) {
> +               u64 tmp_start, tmp_end, tmp_size;
> +
> +               tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
> +
> +               prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
> +               if (!prop) {
> +                       ret = -EINVAL;
> +                       goto out;
> +               }
> +
> +               tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));

Some kernel code assumes "linux,initrd-{start,end}" are 64-bit,
other code assumes 32-bit.
linux/Documentation/arm/uefi.rst says 64-bit,
dt-schema/schemas/chosen.yaml says 32-bit.

> +
> +               /*
> +                * kexec reserves exact initrd size, while firmware may
> +                * reserve a multiple of PAGE_SIZE, so check for both.
> +                */
> +               tmp_size = tmp_end - tmp_start;
> +               ret = fdt_find_and_del_mem_rsv(fdt, tmp_start, tmp_size);
> +               if (ret == -ENOENT)
> +                       ret = fdt_find_and_del_mem_rsv(fdt, tmp_start,
> +                                                      round_up(tmp_size, PAGE_SIZE));
> +               if (ret == -EINVAL)
> +                       goto out;
> +       }
> +
> +       /* add initrd-* */
> +       if (initrd_load_addr) {
> +               ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_START,
> +                                     initrd_load_addr);
> +               if (ret)
> +                       goto out;
> +
> +               ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_END,
> +                                     initrd_load_addr + initrd_len);
> +               if (ret)
> +                       goto out;
> +
> +               ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
> +               if (ret)
> +                       goto out;
> +
> +       } else {
> +               ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_START);
> +               if (ret && (ret != -FDT_ERR_NOTFOUND))
> +                       goto out;
> +
> +               ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_END);
> +               if (ret && (ret != -FDT_ERR_NOTFOUND))
> +                       goto out;
> +       }

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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Re: [PATCH v19 05/13] of: Add a common kexec FDT setup function

[Rob Herring]

On Tue, Jun 15, 2021 at 6:18 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Lakshmi and Rob,
>
> On Sun, Feb 21, 2021 at 6:52 PM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
> > From: Rob Herring <robh@kernel.org>
> >
> > Both arm64 and powerpc do essentially the same FDT /chosen setup for
> > kexec.  The differences are either omissions that arm64 should have
> > or additional properties that will be ignored.  The setup code can be
> > combined and shared by both powerpc and arm64.
> >
> > The differences relative to the arm64 version:
> >  - If /chosen doesn't exist, it will be created (should never happen).
> >  - Any old dtb and initrd reserved memory will be released.
> >  - The new initrd and elfcorehdr are marked reserved.
> >  - "linux,booted-from-kexec" is set.
> >
> > The differences relative to the powerpc version:
> >  - "kaslr-seed" and "rng-seed" may be set.
> >  - "linux,elfcorehdr" is set.
> >  - Any existing "linux,usable-memory-range" is removed.
> >
> > Combine the code for setting up the /chosen node in the FDT and updating
> > the memory reservation for kexec, for powerpc and arm64, in
> > of_kexec_alloc_and_setup_fdt() and move it to "drivers/of/kexec.c".
> >
> > Signed-off-by: Rob Herring <robh@kernel.org>
> > Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>
> > --- /dev/null
> > +++ b/drivers/of/kexec.c
>
> > +/*
> > + * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
> > + *
> > + * @image:             kexec image being loaded.
> > + * @initrd_load_addr:  Address where the next initrd will be loaded.
> > + * @initrd_len:                Size of the next initrd, or 0 if there will be none.
> > + * @cmdline:           Command line for the next kernel, or NULL if there will
> > + *                     be none.
> > + * @extra_fdt_size:    Additional size for the new FDT buffer.
> > + *
> > + * Return: fdt on success, or NULL errno on error.
> > + */
> > +void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
> > +                                  unsigned long initrd_load_addr,
> > +                                  unsigned long initrd_len,
> > +                                  const char *cmdline, size_t extra_fdt_size)
> > +{
>
> > +       /* Did we boot using an initrd? */
> > +       prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
> > +       if (prop) {
> > +               u64 tmp_start, tmp_end, tmp_size;
> > +
> > +               tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
> > +
> > +               prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
> > +               if (!prop) {
> > +                       ret = -EINVAL;
> > +                       goto out;
> > +               }
> > +
> > +               tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
>
> Some kernel code assumes "linux,initrd-{start,end}" are 64-bit,
> other code assumes 32-bit.

It can be either. The above code was a merge of arm64 and powerpc both
of which use 64-bit and still only runs on those arches. It looks like
some powerpc platforms may use 32-bit, but this would have been broken
before.

The code in drivers/of/fdt.c handles either case. We should probably
refactor early_init_dt_check_for_initrd() and this function to use a
common routine.

> linux/Documentation/arm/uefi.rst says 64-bit,
> dt-schema/schemas/chosen.yaml says 32-bit.

We should fix that.

Rob

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Re: [PATCH v19 05/13] of: Add a common kexec FDT setup function

[nramas]

On Tue, 2021-06-15 at 08:01 -0600, Rob Herring wrote:
> On Tue, Jun 15, 2021 at 6:18 AM Geert Uytterhoeven <
> geert@linux-m68k.org> wrote:
> > 
> > > +void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
> > > +                                  unsigned long
> > > initrd_load_addr,
> > > +                                  unsigned long initrd_len,
> > > +                                  const char *cmdline, size_t
> > > extra_fdt_size)
> > > +{
> > > +       /* Did we boot using an initrd? */
> > > +       prop = fdt_getprop(fdt, chosen_node, "linux,initrd-
> > > start", NULL);
> > > +       if (prop) {
> > > +               u64 tmp_start, tmp_end, tmp_size;
> > > +
> > > +               tmp_start = fdt64_to_cpu(*((const fdt64_t *)
> > > prop));
> > > +
> > > +               prop = fdt_getprop(fdt, chosen_node,
> > > "linux,initrd-end", NULL);
> > > +               if (!prop) {
> > > +                       ret = -EINVAL;
> > > +                       goto out;
> > > +               }
> > > +
> > > +               tmp_end = fdt64_to_cpu(*((const fdt64_t *)
> > > prop));
> > 
> > Some kernel code assumes "linux,initrd-{start,end}" are 64-bit,
> > other code assumes 32-bit.
> 
> It can be either. The above code was a merge of arm64 and powerpc
> both
> of which use 64-bit and still only runs on those arches. It looks
> like
> some powerpc platforms may use 32-bit, but this would have been
> broken
> before.
of_kexec_alloc_and_setup_fdt() is called from elf_64.c (in
arch/powerpc/kexec) which is for 64-bit powerpc platform only.

thanks,
 -lakshmi

> 
> The code in drivers/of/fdt.c handles either case. We should probably
> refactor early_init_dt_check_for_initrd() and this function to use a
> common routine.
> 
> > linux/Documentation/arm/uefi.rst says 64-bit,
> > dt-schema/schemas/chosen.yaml says 32-bit.
> 
> We should fix that.
> 
> Rob


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Re: [PATCH v19 05/13] of: Add a common kexec FDT setup function

[Rob Herring]

On Tue, Jun 15, 2021 at 10:13 AM nramas <nramas@linux.microsoft.com> wrote:
>
> On Tue, 2021-06-15 at 08:01 -0600, Rob Herring wrote:
> > On Tue, Jun 15, 2021 at 6:18 AM Geert Uytterhoeven <
> > geert@linux-m68k.org> wrote:
> > >
> > > > +void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
> > > > +                                  unsigned long
> > > > initrd_load_addr,
> > > > +                                  unsigned long initrd_len,
> > > > +                                  const char *cmdline, size_t
> > > > extra_fdt_size)
> > > > +{
> > > > +       /* Did we boot using an initrd? */
> > > > +       prop = fdt_getprop(fdt, chosen_node, "linux,initrd-
> > > > start", NULL);
> > > > +       if (prop) {
> > > > +               u64 tmp_start, tmp_end, tmp_size;
> > > > +
> > > > +               tmp_start = fdt64_to_cpu(*((const fdt64_t *)
> > > > prop));
> > > > +
> > > > +               prop = fdt_getprop(fdt, chosen_node,
> > > > "linux,initrd-end", NULL);
> > > > +               if (!prop) {
> > > > +                       ret = -EINVAL;
> > > > +                       goto out;
> > > > +               }
> > > > +
> > > > +               tmp_end = fdt64_to_cpu(*((const fdt64_t *)
> > > > prop));
> > >
> > > Some kernel code assumes "linux,initrd-{start,end}" are 64-bit,
> > > other code assumes 32-bit.
> >
> > It can be either. The above code was a merge of arm64 and powerpc
> > both
> > of which use 64-bit and still only runs on those arches. It looks
> > like
> > some powerpc platforms may use 32-bit, but this would have been
> > broken
> > before.
> of_kexec_alloc_and_setup_fdt() is called from elf_64.c (in
> arch/powerpc/kexec) which is for 64-bit powerpc platform only.

64-bit PPC could be writing 32-bit property values. The architecture
size doesn't necessarily matter. And if the values came from the
bootloader, who knows what size it used.

This code is 32-bit powerpc only?:

arch/powerpc/boot/main.c-       /* Tell the kernel initrd address via
device tree */
arch/powerpc/boot/main.c:       setprop_val(chosen,
"linux,initrd-start", (u32)(initrd_addr));
arch/powerpc/boot/main.c-       setprop_val(chosen,
"linux,initrd-end", (u32)(initrd_addr+initrd_size));

Rob

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Re: [PATCH v19 05/13] of: Add a common kexec FDT setup function

[Michael Ellerman]

Rob Herring <robh@kernel.org> writes:
> On Tue, Jun 15, 2021 at 10:13 AM nramas <nramas@linux.microsoft.com> wrote:
>>
>> On Tue, 2021-06-15 at 08:01 -0600, Rob Herring wrote:
>> > On Tue, Jun 15, 2021 at 6:18 AM Geert Uytterhoeven <
>> > geert@linux-m68k.org> wrote:
>> > >
>> > > > +void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
>> > > > +                                  unsigned long
>> > > > initrd_load_addr,
>> > > > +                                  unsigned long initrd_len,
>> > > > +                                  const char *cmdline, size_t
>> > > > extra_fdt_size)
>> > > > +{
>> > > > +       /* Did we boot using an initrd? */
>> > > > +       prop = fdt_getprop(fdt, chosen_node, "linux,initrd-
>> > > > start", NULL);
>> > > > +       if (prop) {
>> > > > +               u64 tmp_start, tmp_end, tmp_size;
>> > > > +
>> > > > +               tmp_start = fdt64_to_cpu(*((const fdt64_t *)
>> > > > prop));
>> > > > +
>> > > > +               prop = fdt_getprop(fdt, chosen_node,
>> > > > "linux,initrd-end", NULL);
>> > > > +               if (!prop) {
>> > > > +                       ret = -EINVAL;
>> > > > +                       goto out;
>> > > > +               }
>> > > > +
>> > > > +               tmp_end = fdt64_to_cpu(*((const fdt64_t *)
>> > > > prop));
>> > >
>> > > Some kernel code assumes "linux,initrd-{start,end}" are 64-bit,
>> > > other code assumes 32-bit.
>> >
>> > It can be either. The above code was a merge of arm64 and powerpc >> > both
>> > of which use 64-bit and still only runs on those arches. It looks >> > like
>> > some powerpc platforms may use 32-bit, but this would have been >> > broken
>> > before.

>> of_kexec_alloc_and_setup_fdt() is called from elf_64.c (in
>> arch/powerpc/kexec) which is for 64-bit powerpc platform only.
>
> 64-bit PPC could be writing 32-bit property values. The architecture
> size doesn't necessarily matter. And if the values came from the
> bootloader, who knows what size it used.
>
> This code is 32-bit powerpc only?:
>
> arch/powerpc/boot/main.c-       /* Tell the kernel initrd address via device tree */
> arch/powerpc/boot/main.c:       setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
> arch/powerpc/boot/main.c-       setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));

Historically that code was always built 32-bit, even when used with a
64-bit kernel.

These days it is also built 64-bit (for ppc64le).

It looks like the drivers/of/fdt.c code can handle either 64 or 32-bit,
so I guess that's why it seems to be working.

Although I'm not sure how much testing the 64-bit case gets, because the
distros tend to just use the vmlinux.

cheers

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Re: [PATCH v19 05/13] of: Add a common kexec FDT setup function

[Rob Herring]

On Tue, Jun 15, 2021 at 8:23 PM Michael Ellerman <mpe@ellerman.id.au> wrote:
>
> Rob Herring <robh@kernel.org> writes:
> > On Tue, Jun 15, 2021 at 10:13 AM nramas <nramas@linux.microsoft.com> wrote:
> >>
> >> On Tue, 2021-06-15 at 08:01 -0600, Rob Herring wrote:
> >> > On Tue, Jun 15, 2021 at 6:18 AM Geert Uytterhoeven <
> >> > geert@linux-m68k.org> wrote:
> >> > >
> >> > > > +void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
> >> > > > +                                  unsigned long
> >> > > > initrd_load_addr,
> >> > > > +                                  unsigned long initrd_len,
> >> > > > +                                  const char *cmdline, size_t
> >> > > > extra_fdt_size)
> >> > > > +{
> >> > > > +       /* Did we boot using an initrd? */
> >> > > > +       prop = fdt_getprop(fdt, chosen_node, "linux,initrd-
> >> > > > start", NULL);
> >> > > > +       if (prop) {
> >> > > > +               u64 tmp_start, tmp_end, tmp_size;
> >> > > > +
> >> > > > +               tmp_start = fdt64_to_cpu(*((const fdt64_t *)
> >> > > > prop));
> >> > > > +
> >> > > > +               prop = fdt_getprop(fdt, chosen_node,
> >> > > > "linux,initrd-end", NULL);
> >> > > > +               if (!prop) {
> >> > > > +                       ret = -EINVAL;
> >> > > > +                       goto out;
> >> > > > +               }
> >> > > > +
> >> > > > +               tmp_end = fdt64_to_cpu(*((const fdt64_t *)
> >> > > > prop));
> >> > >
> >> > > Some kernel code assumes "linux,initrd-{start,end}" are 64-bit,
> >> > > other code assumes 32-bit.
> >> >
> >> > It can be either. The above code was a merge of arm64 and powerpc >> > both
> >> > of which use 64-bit and still only runs on those arches. It looks >> > like
> >> > some powerpc platforms may use 32-bit, but this would have been >> > broken
> >> > before.
>
> >> of_kexec_alloc_and_setup_fdt() is called from elf_64.c (in
> >> arch/powerpc/kexec) which is for 64-bit powerpc platform only.
> >
> > 64-bit PPC could be writing 32-bit property values. The architecture
> > size doesn't necessarily matter. And if the values came from the
> > bootloader, who knows what size it used.
> >
> > This code is 32-bit powerpc only?:
> >
> > arch/powerpc/boot/main.c-       /* Tell the kernel initrd address via device tree */
> > arch/powerpc/boot/main.c:       setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
> > arch/powerpc/boot/main.c-       setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
>
> Historically that code was always built 32-bit, even when used with a
> 64-bit kernel.
>
> These days it is also built 64-bit (for ppc64le).

How it is built is immaterial. It's always writing a 32-bit value due
to the u32 cast.

> It looks like the drivers/of/fdt.c code can handle either 64 or 32-bit,
> so I guess that's why it seems to be working.

Yes, that works, but that's not the issue. The question is does the
main.c code run in combination with kexec. The kexec code above
(copied straight from PPC code) would not work if linux,initrd-* are
written by the main.c code.

Rob

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[PATCH v19 06/13] arm64: Use common of_kexec_alloc_and_setup_fdt()

[Lakshmi Ramasubramanian]

From: Rob Herring <robh@kernel.org>

The code for setting up the /chosen node in the device tree
and updating the memory reservation for the next kernel has been
moved to of_kexec_alloc_and_setup_fdt() defined in "drivers/of/kexec.c".

Use the common of_kexec_alloc_and_setup_fdt() to setup the device tree
and update the memory reservation for kexec for arm64.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/arm64/kernel/machine_kexec_file.c | 180 ++-----------------------
 1 file changed, 8 insertions(+), 172 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 5553de3d401a..63634b4d72c1 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -15,23 +15,12 @@
 #include <linux/kexec.h>
 #include <linux/libfdt.h>
 #include <linux/memblock.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
-#include <linux/random.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/vmalloc.h>
-#include <asm/byteorder.h>
-
-/* relevant device tree properties */
-#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
-#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
-#define FDT_PROP_INITRD_START	"linux,initrd-start"
-#define FDT_PROP_INITRD_END	"linux,initrd-end"
-#define FDT_PROP_BOOTARGS	"bootargs"
-#define FDT_PROP_KASLR_SEED	"kaslr-seed"
-#define FDT_PROP_RNG_SEED	"rng-seed"
-#define RNG_SEED_SIZE		128
 
 const struct kexec_file_ops * const kexec_file_loaders[] = {
 	&kexec_image_ops,
@@ -40,7 +29,7 @@ const struct kexec_file_ops * const kexec_file_loaders[] = {
 
 int arch_kimage_file_post_load_cleanup(struct kimage *image)
 {
-	vfree(image->arch.dtb);
+	kvfree(image->arch.dtb);
 	image->arch.dtb = NULL;
 
 	vfree(image->elf_headers);
@@ -50,162 +39,6 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	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, void *dtb)
-{
-	int off, ret;
-
-	ret = fdt_path_offset(dtb, "/chosen");
-	if (ret < 0)
-		goto out;
-
-	off = ret;
-
-	ret = fdt_delprop(dtb, off, FDT_PROP_KEXEC_ELFHDR);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		goto out;
-	ret = fdt_delprop(dtb, off, FDT_PROP_MEM_RANGE);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		goto out;
-
-	if (image->type == KEXEC_TYPE_CRASH) {
-		/* add linux,elfcorehdr */
-		ret = fdt_appendprop_addrrange(dtb, 0, off,
-				FDT_PROP_KEXEC_ELFHDR,
-				image->elf_load_addr,
-				image->elf_headers_sz);
-		if (ret)
-			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
-
-		/* add linux,usable-memory-range */
-		ret = fdt_appendprop_addrrange(dtb, 0, off,
-				FDT_PROP_MEM_RANGE,
-				crashk_res.start,
-				crashk_res.end - crashk_res.start + 1);
-		if (ret)
-			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
-	}
-
-	/* add bootargs */
-	if (cmdline) {
-		ret = fdt_setprop_string(dtb, off, FDT_PROP_BOOTARGS, cmdline);
-		if (ret)
-			goto out;
-	} else {
-		ret = fdt_delprop(dtb, off, FDT_PROP_BOOTARGS);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-	}
-
-	/* add initrd-* */
-	if (initrd_load_addr) {
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_START,
-				      initrd_load_addr);
-		if (ret)
-			goto out;
-
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_END,
-				      initrd_load_addr + initrd_len);
-		if (ret)
-			goto out;
-	} else {
-		ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_START);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-
-		ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_END);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-	}
-
-	/* add kaslr-seed */
-	ret = fdt_delprop(dtb, off, FDT_PROP_KASLR_SEED);
-	if (ret == -FDT_ERR_NOTFOUND)
-		ret = 0;
-	else if (ret)
-		goto out;
-
-	if (rng_is_initialized()) {
-		u64 seed = get_random_u64();
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_KASLR_SEED, seed);
-		if (ret)
-			goto out;
-	} else {
-		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
-				FDT_PROP_KASLR_SEED);
-	}
-
-	/* add rng-seed */
-	if (rng_is_initialized()) {
-		void *rng_seed;
-		ret = fdt_setprop_placeholder(dtb, off, FDT_PROP_RNG_SEED,
-				RNG_SEED_SIZE, &rng_seed);
-		if (ret)
-			goto out;
-		get_random_bytes(rng_seed, RNG_SEED_SIZE);
-	} else {
-		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
-				FDT_PROP_RNG_SEED);
-	}
-
-out:
-	if (ret)
-		return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
-
-	return 0;
-}
-
-/*
- * More space needed so that we can add initrd, bootargs, kaslr-seed,
- * rng-seed, userable-memory-range and elfcorehdr.
- */
-#define DTB_EXTRA_SPACE 0x1000
-
-static int create_dtb(struct kimage *image,
-		      unsigned long initrd_load_addr, unsigned long initrd_len,
-		      char *cmdline, void **dtb)
-{
-	void *buf;
-	size_t buf_size;
-	size_t cmdline_len;
-	int ret;
-
-	cmdline_len = cmdline ? strlen(cmdline) : 0;
-	buf_size = fdt_totalsize(initial_boot_params)
-			+ cmdline_len + DTB_EXTRA_SPACE;
-
-	for (;;) {
-		buf = vmalloc(buf_size);
-		if (!buf)
-			return -ENOMEM;
-
-		/* duplicate a device tree blob */
-		ret = fdt_open_into(initial_boot_params, buf, buf_size);
-		if (ret)
-			return -EINVAL;
-
-		ret = setup_dtb(image, initrd_load_addr, initrd_len,
-				cmdline, buf);
-		if (ret) {
-			vfree(buf);
-			if (ret == -ENOMEM) {
-				/* unlikely, but just in case */
-				buf_size += DTB_EXTRA_SPACE;
-				continue;
-			} else {
-				return ret;
-			}
-		}
-
-		/* trim it */
-		fdt_pack(buf);
-		*dtb = buf;
-
-		return 0;
-	}
-}
-
 static int prepare_elf_headers(void **addr, unsigned long *sz)
 {
 	struct crash_mem *cmem;
@@ -312,12 +145,15 @@ int load_other_segments(struct kimage *image,
 	}
 
 	/* load dtb */
-	ret = create_dtb(image, initrd_load_addr, initrd_len, cmdline, &dtb);
-	if (ret) {
+	dtb = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
+					   initrd_len, cmdline, 0);
+	if (!dtb) {
 		pr_err("Preparing for new dtb failed\n");
 		goto out_err;
 	}
 
+	/* trim it */
+	fdt_pack(dtb);
 	dtb_len = fdt_totalsize(dtb);
 	kbuf.buffer = dtb;
 	kbuf.bufsz = dtb_len;
@@ -341,6 +177,6 @@ int load_other_segments(struct kimage *image,
 
 out_err:
 	image->nr_segments = orig_segments;
-	vfree(dtb);
+	kvfree(dtb);
 	return ret;
 }
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v19 07/13] powerpc: Use common of_kexec_alloc_and_setup_fdt()

[Lakshmi Ramasubramanian]

From: Rob Herring <robh@kernel.org>

The code for setting up the /chosen node in the device tree
and updating the memory reservation for the next kernel has been
moved to of_kexec_alloc_and_setup_fdt() defined in "drivers/of/kexec.c".

Use the common of_kexec_alloc_and_setup_fdt() to setup the device tree
and update the memory reservation for kexec for powerpc.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/powerpc/include/asm/kexec.h  |   1 +
 arch/powerpc/kexec/elf_64.c       |  30 ++++---
 arch/powerpc/kexec/file_load.c    | 132 +-----------------------------
 arch/powerpc/kexec/file_load_64.c |   3 +
 4 files changed, 26 insertions(+), 140 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 69c2a8aa142a..c483c2cf284e 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -107,6 +107,7 @@ struct kimage_arch {
 
 	unsigned long backup_start;
 	void *backup_buf;
+	void *fdt;
 
 #ifdef CONFIG_IMA_KEXEC
 	phys_addr_t ima_buffer_addr;
diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
index d0e459bb2f05..87e34611f93d 100644
--- a/arch/powerpc/kexec/elf_64.c
+++ b/arch/powerpc/kexec/elf_64.c
@@ -19,6 +19,7 @@
 #include <linux/kexec.h>
 #include <linux/libfdt.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/slab.h>
 #include <linux/types.h>
@@ -29,7 +30,6 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 			unsigned long cmdline_len)
 {
 	int ret;
-	unsigned int fdt_size;
 	unsigned long kernel_load_addr;
 	unsigned long initrd_load_addr = 0, fdt_load_addr;
 	void *fdt;
@@ -102,15 +102,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 		pr_debug("Loaded initrd at 0x%lx\n", initrd_load_addr);
 	}
 
-	fdt_size = fdt_totalsize(initial_boot_params) * 2;
-	fdt = kmalloc(fdt_size, GFP_KERNEL);
+	fdt = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
+					   initrd_len, cmdline,
+					   fdt_totalsize(initial_boot_params));
 	if (!fdt) {
-		pr_err("Not enough memory for the device tree.\n");
-		ret = -ENOMEM;
-		goto out;
-	}
-	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
-	if (ret < 0) {
 		pr_err("Error setting up the new device tree.\n");
 		ret = -EINVAL;
 		goto out;
@@ -124,13 +119,17 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	fdt_pack(fdt);
 
 	kbuf.buffer = fdt;
-	kbuf.bufsz = kbuf.memsz = fdt_size;
+	kbuf.bufsz = kbuf.memsz = fdt_totalsize(fdt);
 	kbuf.buf_align = PAGE_SIZE;
 	kbuf.top_down = true;
 	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
 	ret = kexec_add_buffer(&kbuf);
 	if (ret)
 		goto out;
+
+	/* FDT will be freed in arch_kimage_file_post_load_cleanup */
+	image->arch.fdt = fdt;
+
 	fdt_load_addr = kbuf.mem;
 
 	pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
@@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	kfree(modified_cmdline);
 	kexec_free_elf_info(&elf_info);
 
-	/* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
-	return ret ? ERR_PTR(ret) : fdt;
+	/*
+	 * Once FDT buffer has been successfully passed to kexec_add_buffer(),
+	 * the FDT buffer address is saved in image->arch.fdt. In that case,
+	 * the memory cannot be freed here in case of any other error.
+	 */
+	if (ret && !image->arch.fdt)
+		kvfree(fdt);
+
+	return ret ? ERR_PTR(ret) : NULL;
 }
 
 const struct kexec_file_ops kexec_elf64_ops = {
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 19d2c5f49daf..c6bbd06d13e2 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -156,135 +156,11 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		  unsigned long initrd_load_addr, unsigned long initrd_len,
 		  const char *cmdline)
 {
-	int ret, chosen_node;
-	const void *prop;
-
-	/* Remove memory reservation for the current device tree. */
-	ret = delete_fdt_mem_rsv(fdt, __pa(initial_boot_params),
-				 fdt_totalsize(initial_boot_params));
-	if (ret == 0)
-		pr_debug("Removed old device tree reservation.\n");
-	else if (ret != -ENOENT)
-		return ret;
-
-	chosen_node = fdt_path_offset(fdt, "/chosen");
-	if (chosen_node == -FDT_ERR_NOTFOUND) {
-		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
-					      "chosen");
-		if (chosen_node < 0) {
-			pr_err("Error creating /chosen.\n");
-			return -EINVAL;
-		}
-	} else if (chosen_node < 0) {
-		pr_err("Malformed device tree: error reading /chosen.\n");
-		return -EINVAL;
-	}
-
-	/* Did we boot using an initrd? */
-	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
-	if (prop) {
-		uint64_t tmp_start, tmp_end, tmp_size;
-
-		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
-
-		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
-		if (!prop) {
-			pr_err("Malformed device tree.\n");
-			return -EINVAL;
-		}
-		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
-
-		/*
-		 * kexec reserves exact initrd size, while firmware may
-		 * reserve a multiple of PAGE_SIZE, so check for both.
-		 */
-		tmp_size = tmp_end - tmp_start;
-		ret = delete_fdt_mem_rsv(fdt, tmp_start, tmp_size);
-		if (ret == -ENOENT)
-			ret = delete_fdt_mem_rsv(fdt, tmp_start,
-						 round_up(tmp_size, PAGE_SIZE));
-		if (ret == 0)
-			pr_debug("Removed old initrd reservation.\n");
-		else if (ret != -ENOENT)
-			return ret;
-
-		/* If there's no new initrd, delete the old initrd's info. */
-		if (initrd_len == 0) {
-			ret = fdt_delprop(fdt, chosen_node,
-					  "linux,initrd-start");
-			if (ret) {
-				pr_err("Error deleting linux,initrd-start.\n");
-				return -EINVAL;
-			}
-
-			ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");
-			if (ret) {
-				pr_err("Error deleting linux,initrd-end.\n");
-				return -EINVAL;
-			}
-		}
-	}
-
-	if (initrd_len) {
-		ret = fdt_setprop_u64(fdt, chosen_node,
-				      "linux,initrd-start",
-				      initrd_load_addr);
-		if (ret < 0)
-			goto err;
-
-		/* initrd-end is the first address after the initrd image. */
-		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
-				      initrd_load_addr + initrd_len);
-		if (ret < 0)
-			goto err;
-
-		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
-		if (ret) {
-			pr_err("Error reserving initrd memory: %s\n",
-			       fdt_strerror(ret));
-			return -EINVAL;
-		}
-	}
-
-	if (cmdline != NULL) {
-		ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
-		if (ret < 0)
-			goto err;
-	} else {
-		ret = fdt_delprop(fdt, chosen_node, "bootargs");
-		if (ret && ret != -FDT_ERR_NOTFOUND) {
-			pr_err("Error deleting bootargs.\n");
-			return -EINVAL;
-		}
-	}
-
-	if (image->type == KEXEC_TYPE_CRASH) {
-		/*
-		 * Avoid elfcorehdr from being stomped on in kdump kernel by
-		 * setting up memory reserve map.
-		 */
-		ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,
-				      image->elf_headers_sz);
-		if (ret) {
-			pr_err("Error reserving elfcorehdr memory: %s\n",
-			       fdt_strerror(ret));
-			goto err;
-		}
-	}
-
-	ret = setup_ima_buffer(image, fdt, chosen_node);
-	if (ret) {
-		pr_err("Error setting up the new device tree.\n");
-		return ret;
-	}
+	int ret;
 
-	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 	if (ret)
-		goto err;
-
-	return 0;
+		pr_err("Error setting up the new device tree.\n");
 
-err:
-	pr_err("Error setting up the new device tree.\n");
-	return -EINVAL;
+	return ret;
 }
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index 4350f225bb67..733226fd7bcf 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -1111,5 +1111,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	image->elf_headers = NULL;
 	image->elf_headers_sz = 0;
 
+	kvfree(image->arch.fdt);
+	image->arch.fdt = NULL;
+
 	return kexec_image_post_load_cleanup_default(image);
 }
-- 
2.30.0


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v19 08/13] powerpc: Move ima buffer fields to struct kimage

[Lakshmi Ramasubramanian]

The fields ima_buffer_addr and ima_buffer_size in "struct kimage_arch"
for powerpc are used to carry forward the IMA measurement list across
kexec system call.  These fields are not architecture specific, but are
currently limited to powerpc.

arch_ima_add_kexec_buffer() defined in "arch/powerpc/kexec/ima.c"
sets ima_buffer_addr and ima_buffer_size for the kexec system call.
This function does not have architecture specific code, but is
currently limited to powerpc.

Move ima_buffer_addr and ima_buffer_size to "struct kimage".
Set ima_buffer_addr and ima_buffer_size in ima_add_kexec_buffer()
in security/integrity/ima/ima_kexec.c.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Will Deacon <will@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/powerpc/include/asm/ima.h     |  3 ---
 arch/powerpc/include/asm/kexec.h   |  5 -----
 arch/powerpc/kexec/ima.c           | 29 ++++++-----------------------
 include/linux/kexec.h              |  3 +++
 security/integrity/ima/ima_kexec.c |  8 ++------
 5 files changed, 11 insertions(+), 37 deletions(-)

diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
index ead488cf3981..51f64fd06c19 100644
--- a/arch/powerpc/include/asm/ima.h
+++ b/arch/powerpc/include/asm/ima.h
@@ -14,9 +14,6 @@ static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
 #endif
 
 #ifdef CONFIG_IMA_KEXEC
-int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
-			      size_t size);
-
 int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
 #else
 static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index c483c2cf284e..4d2c9b5087e1 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -108,11 +108,6 @@ struct kimage_arch {
 	unsigned long backup_start;
 	void *backup_buf;
 	void *fdt;
-
-#ifdef CONFIG_IMA_KEXEC
-	phys_addr_t ima_buffer_addr;
-	size_t ima_buffer_size;
-#endif
 };
 
 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index 720e50e490b6..ed38125e2f87 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -128,23 +128,6 @@ void remove_ima_buffer(void *fdt, int chosen_node)
 }
 
 #ifdef CONFIG_IMA_KEXEC
-/**
- * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
- *
- * Architectures should use this function to pass on the IMA buffer
- * information to the next kernel.
- *
- * Return: 0 on success, negative errno on error.
- */
-int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
-			      size_t size)
-{
-	image->arch.ima_buffer_addr = load_addr;
-	image->arch.ima_buffer_size = size;
-
-	return 0;
-}
-
 static int write_number(void *p, u64 value, int cells)
 {
 	if (cells == 1) {
@@ -180,7 +163,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	u8 value[16];
 
 	remove_ima_buffer(fdt, chosen_node);
-	if (!image->arch.ima_buffer_size)
+	if (!image->ima_buffer_size)
 		return 0;
 
 	ret = get_addr_size_cells(&addr_cells, &size_cells);
@@ -192,11 +175,11 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (entry_size > sizeof(value))
 		return -EINVAL;
 
-	ret = write_number(value, image->arch.ima_buffer_addr, addr_cells);
+	ret = write_number(value, image->ima_buffer_addr, addr_cells);
 	if (ret)
 		return ret;
 
-	ret = write_number(value + 4 * addr_cells, image->arch.ima_buffer_size,
+	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
 			   size_cells);
 	if (ret)
 		return ret;
@@ -206,13 +189,13 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (ret < 0)
 		return -EINVAL;
 
-	ret = fdt_add_mem_rsv(fdt, image->arch.ima_buffer_addr,
-			      image->arch.ima_buffer_size);
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
 	if (ret)
 		return -EINVAL;
 
 	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
-		 image->arch.ima_buffer_addr, image->arch.ima_buffer_size);
+		 image->ima_buffer_addr, image->ima_buffer_size);
 
 	return 0;
 }
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0208fe8f8e42..c3e2a2af1aea 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -304,6 +304,9 @@ struct kimage {
 #ifdef CONFIG_IMA_KEXEC
 	/* Virtual address of IMA measurement buffer for kexec syscall */
 	void *ima_buffer;
+
+	phys_addr_t ima_buffer_addr;
+	size_t ima_buffer_size;
 #endif
 
 	/* Core ELF header buffer */
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index e29bea3dd4cc..8b1a3d50c49c 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -123,12 +123,8 @@ void ima_add_kexec_buffer(struct kimage *image)
 		return;
 	}
 
-	ret = arch_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
-	if (ret) {
-		pr_err("Error passing over kexec measurement buffer.\n");
-		return;
-	}
-
+	image->ima_buffer_addr = kbuf.mem;
+	image->ima_buffer_size = kexec_segment_size;
 	image->ima_buffer = kexec_buffer;
 
 	pr_debug("kexec measurement buffer for the loaded kernel at 0x%lx.\n",
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v19 09/13] powerpc: Enable passing IMA log to next kernel on kexec

[Lakshmi Ramasubramanian]

CONFIG_HAVE_IMA_KEXEC is enabled to indicate that the IMA measurement
log information is present in the device tree. This should be selected
only if CONFIG_IMA is enabled.

Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC, if CONFIG_IMA
is enabled, to indicate that the IMA measurement log information is
present in the device tree for powerpc.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/powerpc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 107bb4319e0e..d6e593ad270e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -554,7 +554,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "kexec file based system call"
 	select KEXEC_CORE
-	select HAVE_IMA_KEXEC
+	select HAVE_IMA_KEXEC if IMA
 	select BUILD_BIN2C
 	select KEXEC_ELF
 	depends on PPC64
-- 
2.30.0


_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v19 10/13] powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c

[Lakshmi Ramasubramanian]

The functions defined in "arch/powerpc/kexec/ima.c" handle setting up
and freeing the resources required to carry over the IMA measurement
list from the current kernel to the next kernel across kexec system call.
These functions do not have architecture specific code, but are
currently limited to powerpc.

Move remove_ima_buffer() and setup_ima_buffer() calls into
of_kexec_alloc_and_setup_fdt() defined in "drivers/of/kexec.c".

Move the remaining architecture independent functions from
"arch/powerpc/kexec/ima.c" to "drivers/of/kexec.c".
Delete "arch/powerpc/kexec/ima.c" and "arch/powerpc/include/asm/ima.h".
Remove references to the deleted files and functions in powerpc and
in ima.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Tested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/powerpc/include/asm/ima.h     |  27 ----
 arch/powerpc/include/asm/kexec.h   |   3 -
 arch/powerpc/kexec/Makefile        |   7 -
 arch/powerpc/kexec/file_load.c     |  25 ---
 arch/powerpc/kexec/file_load_64.c  |   4 -
 arch/powerpc/kexec/ima.c           | 202 ------------------------
 drivers/of/kexec.c                 | 240 +++++++++++++++++++++++++++++
 include/linux/of.h                 |   2 +
 security/integrity/ima/ima.h       |   4 -
 security/integrity/ima/ima_kexec.c |   1 +
 10 files changed, 243 insertions(+), 272 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/ima.h
 delete mode 100644 arch/powerpc/kexec/ima.c

diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
deleted file mode 100644
index 51f64fd06c19..000000000000
--- a/arch/powerpc/include/asm/ima.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_POWERPC_IMA_H
-#define _ASM_POWERPC_IMA_H
-
-struct kimage;
-
-int ima_get_kexec_buffer(void **addr, size_t *size);
-int ima_free_kexec_buffer(void);
-
-#ifdef CONFIG_IMA
-void remove_ima_buffer(void *fdt, int chosen_node);
-#else
-static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
-#endif
-
-#ifdef CONFIG_IMA_KEXEC
-int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
-#else
-static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
-				   int chosen_node)
-{
-	remove_ima_buffer(fdt, chosen_node);
-	return 0;
-}
-#endif /* CONFIG_IMA_KEXEC */
-
-#endif /* _ASM_POWERPC_IMA_H */
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 4d2c9b5087e1..1af7b5962bb9 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -115,9 +115,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 int setup_purgatory(struct kimage *image, const void *slave_code,
 		    const void *fdt, unsigned long kernel_load_addr,
 		    unsigned long fdt_load_addr);
-int setup_new_fdt(const struct kimage *image, void *fdt,
-		  unsigned long initrd_load_addr, unsigned long initrd_len,
-		  const char *cmdline);
 int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 
 #ifdef CONFIG_PPC64
diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile
index 4aff6846c772..b6c52608cb49 100644
--- a/arch/powerpc/kexec/Makefile
+++ b/arch/powerpc/kexec/Makefile
@@ -9,13 +9,6 @@ obj-$(CONFIG_PPC32)		+= relocate_32.o
 
 obj-$(CONFIG_KEXEC_FILE)	+= file_load.o ranges.o file_load_$(BITS).o elf_$(BITS).o
 
-ifdef CONFIG_HAVE_IMA_KEXEC
-ifdef CONFIG_IMA
-obj-y				+= ima.o
-endif
-endif
-
-
 # Disable GCOV, KCOV & sanitizers in odd or sensitive code
 GCOV_PROFILE_core_$(BITS).o := n
 KCOV_INSTRUMENT_core_$(BITS).o := n
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index c6bbd06d13e2..dc28cb7813c8 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -19,7 +19,6 @@
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/setup.h>
-#include <asm/ima.h>
 
 #define SLAVE_CODE_SIZE		256	/* First 0x100 bytes */
 
@@ -140,27 +139,3 @@ int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
 
 	return -ENOENT;
 }
-
-/*
- * setup_new_fdt - modify /chosen and memory reservation for the next kernel
- * @image:		kexec image being loaded.
- * @fdt:		Flattened device tree for the next kernel.
- * @initrd_load_addr:	Address where the next initrd will be loaded.
- * @initrd_len:		Size of the next initrd, or 0 if there will be none.
- * @cmdline:		Command line for the next kernel, or NULL if there will
- *			be none.
- *
- * Return: 0 on success, or negative errno on error.
- */
-int setup_new_fdt(const struct kimage *image, void *fdt,
-		  unsigned long initrd_load_addr, unsigned long initrd_len,
-		  const char *cmdline)
-{
-	int ret;
-
-	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
-	if (ret)
-		pr_err("Error setting up the new device tree.\n");
-
-	return ret;
-}
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index 733226fd7bcf..5514f0b2ec95 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -944,10 +944,6 @@ int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
 	struct crash_mem *umem = NULL, *rmem = NULL;
 	int i, nr_ranges, ret;
 
-	ret = setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
-	if (ret)
-		goto out;
-
 	/*
 	 * Restrict memory usage for kdump kernel by setting up
 	 * usable memory ranges and memory reserve map.
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
deleted file mode 100644
index ed38125e2f87..000000000000
--- a/arch/powerpc/kexec/ima.c
+++ /dev/null
@@ -1,202 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2016 IBM Corporation
- *
- * Authors:
- * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
- */
-
-#include <linux/slab.h>
-#include <linux/kexec.h>
-#include <linux/of.h>
-#include <linux/memblock.h>
-#include <linux/libfdt.h>
-
-static int get_addr_size_cells(int *addr_cells, int *size_cells)
-{
-	struct device_node *root;
-
-	root = of_find_node_by_path("/");
-	if (!root)
-		return -EINVAL;
-
-	*addr_cells = of_n_addr_cells(root);
-	*size_cells = of_n_size_cells(root);
-
-	of_node_put(root);
-
-	return 0;
-}
-
-static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
-			       size_t *size)
-{
-	int ret, addr_cells, size_cells;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	if (len < 4 * (addr_cells + size_cells))
-		return -ENOENT;
-
-	*addr = of_read_number(prop, addr_cells);
-	*size = of_read_number(prop + 4 * addr_cells, size_cells);
-
-	return 0;
-}
-
-/**
- * ima_get_kexec_buffer - get IMA buffer from the previous kernel
- * @addr:	On successful return, set to point to the buffer contents.
- * @size:	On successful return, set to the buffer size.
- *
- * Return: 0 on success, negative errno on error.
- */
-int ima_get_kexec_buffer(void **addr, size_t *size)
-{
-	int ret, len;
-	unsigned long tmp_addr;
-	size_t tmp_size;
-	const void *prop;
-
-	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
-	if (ret)
-		return ret;
-
-	*addr = __va(tmp_addr);
-	*size = tmp_size;
-
-	return 0;
-}
-
-/**
- * ima_free_kexec_buffer - free memory used by the IMA buffer
- */
-int ima_free_kexec_buffer(void)
-{
-	int ret;
-	unsigned long addr;
-	size_t size;
-	struct property *prop;
-
-	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
-	if (ret)
-		return ret;
-
-	ret = of_remove_property(of_chosen, prop);
-	if (ret)
-		return ret;
-
-	return memblock_free(addr, size);
-
-}
-
-/**
- * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
- *
- * The IMA measurement buffer is of no use to a subsequent kernel, so we always
- * remove it from the device tree.
- */
-void remove_ima_buffer(void *fdt, int chosen_node)
-{
-	int ret, len;
-	unsigned long addr;
-	size_t size;
-	const void *prop;
-
-	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return;
-
-	ret = do_get_kexec_buffer(prop, len, &addr, &size);
-	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
-	if (ret)
-		return;
-
-	ret = delete_fdt_mem_rsv(fdt, addr, size);
-	if (!ret)
-		pr_debug("Removed old IMA buffer reservation.\n");
-}
-
-#ifdef CONFIG_IMA_KEXEC
-static int write_number(void *p, u64 value, int cells)
-{
-	if (cells == 1) {
-		u32 tmp;
-
-		if (value > U32_MAX)
-			return -EINVAL;
-
-		tmp = cpu_to_be32(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else if (cells == 2) {
-		u64 tmp;
-
-		tmp = cpu_to_be64(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else
-		return -EINVAL;
-
-	return 0;
-}
-
-/**
- * setup_ima_buffer - add IMA buffer information to the fdt
- * @image:		kexec image being loaded.
- * @fdt:		Flattened device tree for the next kernel.
- * @chosen_node:	Offset to the chosen node.
- *
- * Return: 0 on success, or negative errno on error.
- */
-int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
-{
-	int ret, addr_cells, size_cells, entry_size;
-	u8 value[16];
-
-	remove_ima_buffer(fdt, chosen_node);
-	if (!image->ima_buffer_size)
-		return 0;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	entry_size = 4 * (addr_cells + size_cells);
-
-	if (entry_size > sizeof(value))
-		return -EINVAL;
-
-	ret = write_number(value, image->ima_buffer_addr, addr_cells);
-	if (ret)
-		return ret;
-
-	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
-			   size_cells);
-	if (ret)
-		return ret;
-
-	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
-			  entry_size);
-	if (ret < 0)
-		return -EINVAL;
-
-	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
-			      image->ima_buffer_size);
-	if (ret)
-		return -EINVAL;
-
-	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
-		 image->ima_buffer_addr, image->ima_buffer_size);
-
-	return 0;
-}
-#endif /* CONFIG_IMA_KEXEC */
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 8fa8946cda42..6512e25671df 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/memblock.h>
 #include <linux/libfdt.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
@@ -69,6 +70,240 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
 	return -ENOENT;
 }
 
+/**
+ * get_addr_size_cells - Get address and size of root node
+ *
+ * @addr_cells: Return address of the root node
+ * @size_cells: Return size of the root node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int get_addr_size_cells(int *addr_cells, int *size_cells)
+{
+	struct device_node *root;
+
+	root = of_find_node_by_path("/");
+	if (!root)
+		return -EINVAL;
+
+	*addr_cells = of_n_addr_cells(root);
+	*size_cells = of_n_size_cells(root);
+
+	of_node_put(root);
+
+	return 0;
+}
+
+/**
+ * do_get_kexec_buffer - Get address and size of device tree property
+ *
+ * @prop: Device tree property
+ * @len: Size of @prop
+ * @addr: Return address of the node
+ * @size: Return size of the node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
+			       size_t *size)
+{
+	int ret, addr_cells, size_cells;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	if (len < 4 * (addr_cells + size_cells))
+		return -ENOENT;
+
+	*addr = of_read_number(prop, addr_cells);
+	*size = of_read_number(prop + 4 * addr_cells, size_cells);
+
+	return 0;
+}
+
+/**
+ * ima_get_kexec_buffer - get IMA buffer from the previous kernel
+ * @addr:	On successful return, set to point to the buffer contents.
+ * @size:	On successful return, set to the buffer size.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int ima_get_kexec_buffer(void **addr, size_t *size)
+{
+	int ret, len;
+	unsigned long tmp_addr;
+	size_t tmp_size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
+	if (ret)
+		return ret;
+
+	*addr = __va(tmp_addr);
+	*size = tmp_size;
+
+	return 0;
+}
+
+/**
+ * ima_free_kexec_buffer - free memory used by the IMA buffer
+ */
+int ima_free_kexec_buffer(void)
+{
+	int ret;
+	unsigned long addr;
+	size_t size;
+	struct property *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+	if (ret)
+		return ret;
+
+	ret = of_remove_property(of_chosen, prop);
+	if (ret)
+		return ret;
+
+	return memblock_free(addr, size);
+
+}
+
+/**
+ * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
+ *
+ * @fdt: Flattened Device Tree to update
+ * @chosen_node: Offset to the chosen node in the device tree
+ *
+ * The IMA measurement buffer is of no use to a subsequent kernel, so we always
+ * remove it from the device tree.
+ */
+static void remove_ima_buffer(void *fdt, int chosen_node)
+{
+	int ret, len;
+	unsigned long addr;
+	size_t size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return;
+
+	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return;
+
+	ret = do_get_kexec_buffer(prop, len, &addr, &size);
+	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
+	if (ret)
+		return;
+
+	ret = fdt_find_and_del_mem_rsv(fdt, addr, size);
+	if (!ret)
+		pr_debug("Removed old IMA buffer reservation.\n");
+}
+
+#ifdef CONFIG_IMA_KEXEC
+/**
+ * write_number - Convert number to big-endian format
+ *
+ * @p:		Buffer to write the number to
+ * @value:	Number to convert
+ * @cells:	Number of cells
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int write_number(void *p, u64 value, int cells)
+{
+	if (cells == 1) {
+		u32 tmp;
+
+		if (value > U32_MAX)
+			return -EINVAL;
+
+		tmp = cpu_to_be32(value);
+		memcpy(p, &tmp, sizeof(tmp));
+	} else if (cells == 2) {
+		u64 tmp;
+
+		tmp = cpu_to_be64(value);
+		memcpy(p, &tmp, sizeof(tmp));
+	} else
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * setup_ima_buffer - add IMA buffer information to the fdt
+ * @image:		kexec image being loaded.
+ * @fdt:		Flattened device tree for the next kernel.
+ * @chosen_node:	Offset to the chosen node.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int setup_ima_buffer(const struct kimage *image, void *fdt,
+			    int chosen_node)
+{
+	int ret, addr_cells, size_cells, entry_size;
+	u8 value[16];
+
+	if (!image->ima_buffer_size)
+		return 0;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	entry_size = 4 * (addr_cells + size_cells);
+
+	if (entry_size > sizeof(value))
+		return -EINVAL;
+
+	ret = write_number(value, image->ima_buffer_addr, addr_cells);
+	if (ret)
+		return ret;
+
+	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
+			   size_cells);
+	if (ret)
+		return ret;
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
+			  entry_size);
+	if (ret < 0)
+		return -EINVAL;
+
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
+	if (ret)
+		return -EINVAL;
+
+	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
+		 image->ima_buffer_addr, image->ima_buffer_size);
+
+	return 0;
+}
+#else /* CONFIG_IMA_KEXEC */
+static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
+				   int chosen_node)
+{
+	return 0;
+}
+#endif /* CONFIG_IMA_KEXEC */
+
 /*
  * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
  *
@@ -254,6 +489,11 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
 	}
 
 	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+	if (ret)
+		goto out;
+
+	remove_ima_buffer(fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 
 out:
 	if (ret) {
diff --git a/include/linux/of.h b/include/linux/of.h
index d66c915df910..e9209ef44cc0 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -565,6 +565,8 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
 				   unsigned long initrd_load_addr,
 				   unsigned long initrd_len,
 				   const char *cmdline, size_t extra_fdt_size);
+int ima_get_kexec_buffer(void **addr, size_t *size);
+int ima_free_kexec_buffer(void);
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 8e8b1e3cb847..cc0906cd3cd6 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -24,10 +24,6 @@
 
 #include "../integrity.h"
 
-#ifdef CONFIG_HAVE_IMA_KEXEC
-#include <asm/ima.h>
-#endif
-
 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
 		     IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 8b1a3d50c49c..667887665823 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -10,6 +10,7 @@
 #include <linux/seq_file.h>
 #include <linux/vmalloc.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
 #include "ima.h"
 
 #ifdef CONFIG_IMA_KEXEC
-- 
2.30.0


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[PATCH v19 11/13] kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT

[Lakshmi Ramasubramanian]

fdt_appendprop_addrrange() function adds a property, with the given name,
to the device tree at the given node offset, and also sets the address
and size of the property.  This function should be used to add
"linux,ima-kexec-buffer" property to the device tree and set the address
and size of the IMA measurement buffer, instead of using custom function.

Use fdt_appendprop_addrrange() to add  "linux,ima-kexec-buffer" property
to the device tree.  This property holds the address and size of
the IMA measurement buffer that needs to be passed from the current
kernel to the next kernel across kexec system call.

Remove custom code that is used in setup_ima_buffer() to add
"linux,ima-kexec-buffer" property to the device tree.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 drivers/of/kexec.c | 57 ++++------------------------------------------
 1 file changed, 5 insertions(+), 52 deletions(-)

diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 6512e25671df..f335d941a716 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -216,36 +216,6 @@ static void remove_ima_buffer(void *fdt, int chosen_node)
 }
 
 #ifdef CONFIG_IMA_KEXEC
-/**
- * write_number - Convert number to big-endian format
- *
- * @p:		Buffer to write the number to
- * @value:	Number to convert
- * @cells:	Number of cells
- *
- * Return: 0 on success, or negative errno on error.
- */
-static int write_number(void *p, u64 value, int cells)
-{
-	if (cells == 1) {
-		u32 tmp;
-
-		if (value > U32_MAX)
-			return -EINVAL;
-
-		tmp = cpu_to_be32(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else if (cells == 2) {
-		u64 tmp;
-
-		tmp = cpu_to_be64(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else
-		return -EINVAL;
-
-	return 0;
-}
-
 /**
  * setup_ima_buffer - add IMA buffer information to the fdt
  * @image:		kexec image being loaded.
@@ -257,32 +227,15 @@ static int write_number(void *p, u64 value, int cells)
 static int setup_ima_buffer(const struct kimage *image, void *fdt,
 			    int chosen_node)
 {
-	int ret, addr_cells, size_cells, entry_size;
-	u8 value[16];
+	int ret;
 
 	if (!image->ima_buffer_size)
 		return 0;
 
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	entry_size = 4 * (addr_cells + size_cells);
-
-	if (entry_size > sizeof(value))
-		return -EINVAL;
-
-	ret = write_number(value, image->ima_buffer_addr, addr_cells);
-	if (ret)
-		return ret;
-
-	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
-			   size_cells);
-	if (ret)
-		return ret;
-
-	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
-			  entry_size);
+	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				       "linux,ima-kexec-buffer",
+				       image->ima_buffer_addr,
+				       image->ima_buffer_size);
 	if (ret < 0)
 		return -EINVAL;
 
-- 
2.30.0


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[PATCH v19 12/13] powerpc: Delete unused function delete_fdt_mem_rsv()

[Lakshmi Ramasubramanian]

delete_fdt_mem_rsv() defined in "arch/powerpc/kexec/file_load.c"
has been renamed to fdt_find_and_del_mem_rsv(), and moved to
"drivers/of/kexec.c".

Remove delete_fdt_mem_rsv() in "arch/powerpc/kexec/file_load.c".

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/powerpc/include/asm/kexec.h |  1 -
 arch/powerpc/kexec/file_load.c   | 32 --------------------------------
 2 files changed, 33 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 1af7b5962bb9..e881e9d083ce 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -115,7 +115,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 int setup_purgatory(struct kimage *image, const void *slave_code,
 		    const void *fdt, unsigned long kernel_load_addr,
 		    unsigned long fdt_load_addr);
-int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 
 #ifdef CONFIG_PPC64
 struct kexec_buf;
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index dc28cb7813c8..4284f76cbef5 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -107,35 +107,3 @@ int setup_purgatory(struct kimage *image, const void *slave_code,
 
 	return 0;
 }
-
-/**
- * delete_fdt_mem_rsv - delete memory reservation with given address and size
- *
- * Return: 0 on success, or negative errno on error.
- */
-int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
-{
-	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
-
-	for (i = 0; i < num_rsvs; i++) {
-		uint64_t rsv_start, rsv_size;
-
-		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
-		if (ret) {
-			pr_err("Malformed device tree.\n");
-			return -EINVAL;
-		}
-
-		if (rsv_start == start && rsv_size == size) {
-			ret = fdt_del_mem_rsv(fdt, i);
-			if (ret) {
-				pr_err("Error deleting device tree reservation.\n");
-				return -EINVAL;
-			}
-
-			return 0;
-		}
-	}
-
-	return -ENOENT;
-}
-- 
2.30.0


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[PATCH v19 13/13] arm64: Enable passing IMA log to next kernel on kexec

[Lakshmi Ramasubramanian]

Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC, if CONFIG_IMA
is enabled, to indicate that the IMA measurement log information is
present in the device tree for ARM64.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 05e17351e4f3..8a93573cebb6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1093,6 +1093,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "kexec file based system call"
 	select KEXEC_CORE
+	select HAVE_IMA_KEXEC if IMA
 	help
 	  This is new version of kexec system call. This system call is
 	  file based and takes file descriptors as system call argument
-- 
2.30.0


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Re: [PATCH v19 00/13] Carry forward IMA measurement log on kexec on ARM64

[Rob Herring]

On Sun, Feb 21, 2021 at 11:49 AM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
>
> On kexec file load Integrity Measurement Architecture (IMA) subsystem
> may verify the IMA signature of the kernel and initramfs, and measure
> it.  The command line parameters passed to the kernel in the kexec call
> may also be measured by IMA.  A remote attestation service can verify
> a TPM quote based on the TPM event log, the IMA measurement list, and
> the TPM PCR data.  This can be achieved only if the IMA measurement log
> is carried over from the current kernel to the next kernel across
> the kexec call.
>
> powerpc already supports carrying forward the IMA measurement log on
> kexec.  This patch set adds support for carrying forward the IMA
> measurement log on kexec on ARM64.
>
> This patch set moves the platform independent code defined for powerpc
> such that it can be reused for other platforms as well.  A chosen node
> "linux,ima-kexec-buffer" is added to the DTB for ARM64 to hold
> the address and the size of the memory reserved to carry
> the IMA measurement log.
>
> This patch set has been tested for ARM64 platform using QEMU.
> I would like help from the community for testing this change on powerpc.
> Thanks.
>
> This patch set is based on
> commit f31e3386a4e9 ("ima: Free IMA measurement buffer after kexec syscall")
> in https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
> "ima-kexec-fixes" branch.
>
> Changelog:
>
> v19
>   - Moved ELF related fields from "struct kimage_arch" for x86, arm64,
>     and powerpc architectures to "struct kimage".
>
> v18
>   - Added a parameter to of_kexec_alloc_and_setup_fdt() for the caller
>     to specify additional space needed for the FDT buffer
>   - Renamed arm64 and powerpc ELF buffer address field in
>     "struct kimage_arch" to elf_load_addr to match x86_64 name.
>   - Removed of_ima_add_kexec_buffer() and instead directly set
>     ima_buffer_addr and ima_buffer_size in ima_add_kexec_buffer()
>   - Moved FDT_EXTRA_SPACE definition from include/linux/of.h to
>     drivers/of/kexec.c
>
> v17
>   - Renamed of_kexec_setup_new_fdt() to of_kexec_alloc_and_setup_fdt(),
>     and moved memory allocation for the new FDT to this function.
>
> v16
>   - Defined functions to allocate and free buffer for FDT for powerpc
>     and arm64.
>   - Moved ima_buffer_addr and ima_buffer_size fields from
>     "struct kimage_arch" in powerpc to "struct kimage"
> v15
>   - Included Rob's patches in the patch set, and rebased
>     the changes to "next-integrity" branch.
>   - Allocate memory for DTB, on arm64, using kmalloc() instead of
>     vmalloc() to keep it consistent with powerpc implementation.
>   - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
>     remove setup_new_fdt() in the same patch to keep it bisect safe.
>
> v14
>   - Select CONFIG_HAVE_IMA_KEXEC for CONFIG_KEXEC_FILE, for powerpc
>     and arm64, if CONFIG_IMA is enabled.
>   - Use IS_ENABLED() macro instead of "#ifdef" in remove_ima_buffer(),
>     ima_get_kexec_buffer(), and ima_free_kexec_buffer().
>   - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
>     remove setup_new_fdt() in "arch/powerpc/kexec/file_load.c".
>
> v13
>   - Moved the arch independent functions to drivers/of/kexec.c
>     and then refactored the code.
>   - Moved arch_ima_add_kexec_buffer() to
>     security/integrity/ima/ima_kexec.c
>
> v12
>   - Use fdt_appendprop_addrrange() in setup_ima_buffer()
>     to setup the IMA measurement list property in
>     the device tree.
>   - Moved architecture independent functions from
>     "arch/powerpc/kexec/ima.c" to "drivers/of/kexec."
>   - Deleted "arch/powerpc/kexec/ima.c" and
>     "arch/powerpc/include/asm/ima.h".
>
> v11
>   - Rebased the changes on the kexec code refactoring done by
>     Rob Herring in his "dt/kexec" branch
>   - Removed "extern" keyword in function declarations
>   - Removed unnecessary header files included in C files
>   - Updated patch descriptions per Thiago's comments
>
> v10
>   - Moved delete_fdt_mem_rsv(), remove_ima_buffer(),
>     get_ima_kexec_buffer, and get_root_addr_size_cells()
>     to drivers/of/kexec.c
>   - Moved arch_ima_add_kexec_buffer() to
>     security/integrity/ima/ima_kexec.c
>   - Conditionally define IMA buffer fields in struct kimage_arch
>
> v9
>   - Moved delete_fdt_mem_rsv() to drivers/of/kexec_fdt.c
>   - Defined a new function get_ima_kexec_buffer() in
>     drivers/of/ima_kexec.c to replace do_get_kexec_buffer()
>   - Changed remove_ima_kexec_buffer() to the original function name
>     remove_ima_buffer()
>   - Moved remove_ima_buffer() to drivers/of/ima_kexec.c
>   - Moved ima_get_kexec_buffer() and ima_free_kexec_buffer()
>     to security/integrity/ima/ima_kexec.c
>
> v8:
>   - Moved remove_ima_kexec_buffer(), do_get_kexec_buffer(), and
>     delete_fdt_mem_rsv() to drivers/of/fdt.c
>   - Moved ima_dump_measurement_list() and ima_add_kexec_buffer()
>     back to security/integrity/ima/ima_kexec.c
>
> v7:
>   - Renamed remove_ima_buffer() to remove_ima_kexec_buffer() and moved
>     this function definition to kernel.
>   - Moved delete_fdt_mem_rsv() definition to kernel
>   - Moved ima_dump_measurement_list() and ima_add_kexec_buffer() to
>     a new file namely ima_kexec_fdt.c in IMA
>
> v6:
>   - Remove any existing FDT_PROP_IMA_KEXEC_BUFFER property in the device
>     tree and also its corresponding memory reservation in the currently
>     running kernel.
>   - Moved the function remove_ima_buffer() defined for powerpc to IMA
>     and renamed the function to ima_remove_kexec_buffer(). Also, moved
>     delete_fdt_mem_rsv() from powerpc to IMA.
>
> v5:
>   - Merged get_addr_size_cells() and do_get_kexec_buffer() into a single
>     function when moving the arch independent code from powerpc to IMA
>   - Reverted the change to use FDT functions in powerpc code and added
>     back the original code in get_addr_size_cells() and
>     do_get_kexec_buffer() for powerpc.
>   - Added fdt_add_mem_rsv() for ARM64 to reserve the memory for
>     the IMA log buffer during kexec.
>   - Fixed the warning reported by kernel test bot for ARM64
>     arch_ima_add_kexec_buffer() - moved this function to a new file
>     namely arch/arm64/kernel/ima_kexec.c
>
> v4:
>   - Submitting the patch series on behalf of the original author
>     Prakhar Srivastava <prsriva@linux.microsoft.com>
>   - Moved FDT_PROP_IMA_KEXEC_BUFFER ("linux,ima-kexec-buffer") to
>     libfdt.h so that it can be shared by multiple platforms.
>
> v3:
> Breakup patches further into separate patches.
>   - Refactoring non architecture specific code out of powerpc
>   - Update powerpc related code to use fdt functions
>   - Update IMA buffer read related code to use of functions
>   - Add support to store the memory information of the IMA
>     measurement logs to be carried forward.
>   - Update the property strings to align with documented nodes
>     https://github.com/devicetree-org/dt-schema/pull/46
>
> v2:
>   Break patches into separate patches.
>   - Powerpc related Refactoring
>   - Updating the docuemntation for chosen node
>   - Updating arm64 to support IMA buffer pass
>
> v1:
>   Refactoring carrying over IMA measuremnet logs over Kexec. This patch
>     moves the non-architecture specific code out of powerpc and adds to
>     security/ima.(Suggested by Thiago)
>   Add Documentation regarding the ima-kexec-buffer node in the chosen
>     node documentation
>
> v0:
>   Add a layer of abstraction to use the memory reserved by device tree
>     for ima buffer pass.
>   Add support for ima buffer pass using reserved memory for arm64 kexec.
>     Update the arch sepcific code path in kexec file load to store the
>     ima buffer in the reserved memory. The same reserved memory is read
>     on kexec or cold boot.
>
> Lakshmi Ramasubramanian (10):
>   kexec: Move ELF fields to struct kimage
>   arm64: Use ELF fields defined in 'struct kimage'
>   powerpc: Use ELF fields defined in 'struct kimage'
>   x86: Use ELF fields defined in 'struct kimage'
>   powerpc: Move ima buffer fields to struct kimage
>   powerpc: Enable passing IMA log to next kernel on kexec
>   powerpc: Move arch independent ima kexec functions to
>     drivers/of/kexec.c
>   kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
>   powerpc: Delete unused function delete_fdt_mem_rsv()
>   arm64: Enable passing IMA log to next kernel on kexec
>
> Rob Herring (3):
>   of: Add a common kexec FDT setup function
>   arm64: Use common of_kexec_alloc_and_setup_fdt()
>   powerpc: Use common of_kexec_alloc_and_setup_fdt()
>
>  arch/arm64/Kconfig                     |   1 +
>  arch/arm64/include/asm/kexec.h         |   4 -
>  arch/arm64/kernel/machine_kexec_file.c | 194 +----------
>  arch/powerpc/Kconfig                   |   2 +-
>  arch/powerpc/include/asm/ima.h         |  30 --
>  arch/powerpc/include/asm/kexec.h       |  14 +-
>  arch/powerpc/kexec/Makefile            |   7 -
>  arch/powerpc/kexec/elf_64.c            |  30 +-
>  arch/powerpc/kexec/file_load.c         | 183 +---------
>  arch/powerpc/kexec/file_load_64.c      |  21 +-
>  arch/powerpc/kexec/ima.c               | 219 ------------
>  arch/x86/include/asm/kexec.h           |   5 -
>  arch/x86/kernel/crash.c                |  14 +-
>  arch/x86/kernel/kexec-bzimage64.c      |   2 +-
>  arch/x86/kernel/machine_kexec_64.c     |   4 +-
>  drivers/of/Makefile                    |   6 +
>  drivers/of/kexec.c                     | 458 +++++++++++++++++++++++++
>  include/linux/kexec.h                  |   8 +
>  include/linux/of.h                     |   7 +
>  security/integrity/ima/ima.h           |   4 -
>  security/integrity/ima/ima_kexec.c     |   9 +-
>  21 files changed, 539 insertions(+), 683 deletions(-)
>  delete mode 100644 arch/powerpc/include/asm/ima.h
>  delete mode 100644 arch/powerpc/kexec/ima.c
>  create mode 100644 drivers/of/kexec.c

I fixed up the Fixes tags and applied for 5.13.

Rob

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Re: [PATCH v19 00/13] Carry forward IMA measurement log on kexec on ARM64

[Lakshmi Ramasubramanian]

On 3/2/21 7:06 AM, Rob Herring wrote:
> On Sun, Feb 21, 2021 at 11:49 AM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
>>
>> On kexec file load Integrity Measurement Architecture (IMA) subsystem
>> may verify the IMA signature of the kernel and initramfs, and measure
>> it.  The command line parameters passed to the kernel in the kexec call
>> may also be measured by IMA.  A remote attestation service can verify
>> a TPM quote based on the TPM event log, the IMA measurement list, and
>> the TPM PCR data.  This can be achieved only if the IMA measurement log
>> is carried over from the current kernel to the next kernel across
>> the kexec call.
>>
>> powerpc already supports carrying forward the IMA measurement log on
>> kexec.  This patch set adds support for carrying forward the IMA
>> measurement log on kexec on ARM64.
>>
>> This patch set moves the platform independent code defined for powerpc
>> such that it can be reused for other platforms as well.  A chosen node
>> "linux,ima-kexec-buffer" is added to the DTB for ARM64 to hold
>> the address and the size of the memory reserved to carry
>> the IMA measurement log.
>>
>> This patch set has been tested for ARM64 platform using QEMU.
>> I would like help from the community for testing this change on powerpc.
>> Thanks.
>>
>> This patch set is based on
>> commit f31e3386a4e9 ("ima: Free IMA measurement buffer after kexec syscall")
>> in https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
>> "ima-kexec-fixes" branch.

[...]

>>
>> Lakshmi Ramasubramanian (10):
>>    kexec: Move ELF fields to struct kimage
>>    arm64: Use ELF fields defined in 'struct kimage'
>>    powerpc: Use ELF fields defined in 'struct kimage'
>>    x86: Use ELF fields defined in 'struct kimage'
>>    powerpc: Move ima buffer fields to struct kimage
>>    powerpc: Enable passing IMA log to next kernel on kexec
>>    powerpc: Move arch independent ima kexec functions to
>>      drivers/of/kexec.c
>>    kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
>>    powerpc: Delete unused function delete_fdt_mem_rsv()
>>    arm64: Enable passing IMA log to next kernel on kexec
>>
>> Rob Herring (3):
>>    of: Add a common kexec FDT setup function
>>    arm64: Use common of_kexec_alloc_and_setup_fdt()
>>    powerpc: Use common of_kexec_alloc_and_setup_fdt()
>>
>>   arch/arm64/Kconfig                     |   1 +
>>   arch/arm64/include/asm/kexec.h         |   4 -
>>   arch/arm64/kernel/machine_kexec_file.c | 194 +----------
>>   arch/powerpc/Kconfig                   |   2 +-
>>   arch/powerpc/include/asm/ima.h         |  30 --
>>   arch/powerpc/include/asm/kexec.h       |  14 +-
>>   arch/powerpc/kexec/Makefile            |   7 -
>>   arch/powerpc/kexec/elf_64.c            |  30 +-
>>   arch/powerpc/kexec/file_load.c         | 183 +---------
>>   arch/powerpc/kexec/file_load_64.c      |  21 +-
>>   arch/powerpc/kexec/ima.c               | 219 ------------
>>   arch/x86/include/asm/kexec.h           |   5 -
>>   arch/x86/kernel/crash.c                |  14 +-
>>   arch/x86/kernel/kexec-bzimage64.c      |   2 +-
>>   arch/x86/kernel/machine_kexec_64.c     |   4 +-
>>   drivers/of/Makefile                    |   6 +
>>   drivers/of/kexec.c                     | 458 +++++++++++++++++++++++++
>>   include/linux/kexec.h                  |   8 +
>>   include/linux/of.h                     |   7 +
>>   security/integrity/ima/ima.h           |   4 -
>>   security/integrity/ima/ima_kexec.c     |   9 +-
>>   21 files changed, 539 insertions(+), 683 deletions(-)
>>   delete mode 100644 arch/powerpc/include/asm/ima.h
>>   delete mode 100644 arch/powerpc/kexec/ima.c
>>   create mode 100644 drivers/of/kexec.c
> 
> I fixed up the Fixes tags and applied for 5.13.
> 

Thanks a lot Rob.

  -lakshmi



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