diff mbox series

[v17,05/10] powerpc: Move ima buffer fields to struct kimage

Message ID 20210209182200.30606-6-nramas@linux.microsoft.com (mailing list archive)
State New
Headers show
Series Carry forward IMA measurement log on kexec on ARM64 | expand

Commit Message

Lakshmi Ramasubramanian Feb. 9, 2021, 6:21 p.m. UTC
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".
Rename arch_ima_add_kexec_buffer() to of_ima_add_kexec_buffer()
and move it in drivers/of/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>
---
 arch/powerpc/include/asm/ima.h     |  3 ---
 arch/powerpc/include/asm/kexec.h   |  5 -----
 arch/powerpc/kexec/ima.c           | 29 ++++++-----------------------
 drivers/of/kexec.c                 | 23 +++++++++++++++++++++++
 include/linux/kexec.h              |  3 +++
 include/linux/of.h                 |  5 +++++
 security/integrity/ima/ima_kexec.c |  3 ++-
 7 files changed, 39 insertions(+), 32 deletions(-)

Comments

Rob Herring Feb. 10, 2021, 5:20 p.m. UTC | #1
On Tue, Feb 09, 2021 at 10:21:55AM -0800, Lakshmi Ramasubramanian wrote:
> 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".
> Rename arch_ima_add_kexec_buffer() to of_ima_add_kexec_buffer()
> and move it in drivers/of/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>
> ---
>  arch/powerpc/include/asm/ima.h     |  3 ---
>  arch/powerpc/include/asm/kexec.h   |  5 -----
>  arch/powerpc/kexec/ima.c           | 29 ++++++-----------------------
>  drivers/of/kexec.c                 | 23 +++++++++++++++++++++++
>  include/linux/kexec.h              |  3 +++
>  include/linux/of.h                 |  5 +++++
>  security/integrity/ima/ima_kexec.c |  3 ++-
>  7 files changed, 39 insertions(+), 32 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 bdd0ddb9ac4d..ecf88533d6b4 100644
> --- a/arch/powerpc/include/asm/kexec.h
> +++ b/arch/powerpc/include/asm/kexec.h
> @@ -112,11 +112,6 @@ struct kimage_arch {
>  	unsigned long elf_headers_sz;
>  	void *elf_headers;
>  	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/drivers/of/kexec.c b/drivers/of/kexec.c
> index 469e09613cdd..9f33d215b9f2 100644
> --- a/drivers/of/kexec.c
> +++ b/drivers/of/kexec.c
> @@ -63,6 +63,29 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
>  	return -ENOENT;
>  }
>  
> +#ifdef CONFIG_IMA_KEXEC
> +/**
> + * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
> + *
> + * @image: kimage struct to set IMA buffer data
> + * @load_addr: Starting address where IMA buffer is loaded at
> + * @size: Number of bytes in the IMA buffer
> + *
> + * Use this function to pass on the IMA buffer information to
> + * the next kernel across kexec system call.
> + *
> + * Return: 0 on success, negative errno on error.
> + */
> +int of_ima_add_kexec_buffer(struct kimage *image,
> +			    unsigned long load_addr, size_t size)
> +{
> +	image->ima_buffer_addr = load_addr;
> +	image->ima_buffer_size = size;
> +

There's nothing DT specific about this function, so this is the wrong 
place for it. I would just remove it and directly set the members.

Rob
Lakshmi Ramasubramanian Feb. 10, 2021, 6 p.m. UTC | #2
On 2/10/21 9:20 AM, Rob Herring wrote:
> On Tue, Feb 09, 2021 at 10:21:55AM -0800, Lakshmi Ramasubramanian wrote:
>> 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".
>> Rename arch_ima_add_kexec_buffer() to of_ima_add_kexec_buffer()
>> and move it in drivers/of/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>
>> ---
>>   arch/powerpc/include/asm/ima.h     |  3 ---
>>   arch/powerpc/include/asm/kexec.h   |  5 -----
>>   arch/powerpc/kexec/ima.c           | 29 ++++++-----------------------
>>   drivers/of/kexec.c                 | 23 +++++++++++++++++++++++
>>   include/linux/kexec.h              |  3 +++
>>   include/linux/of.h                 |  5 +++++
>>   security/integrity/ima/ima_kexec.c |  3 ++-
>>   7 files changed, 39 insertions(+), 32 deletions(-)

>> diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
>> index 469e09613cdd..9f33d215b9f2 100644
>> --- a/drivers/of/kexec.c
>> +++ b/drivers/of/kexec.c
>> @@ -63,6 +63,29 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
>>   	return -ENOENT;
>>   }
>>   
>> +#ifdef CONFIG_IMA_KEXEC
>> +/**
>> + * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
>> + *
>> + * @image: kimage struct to set IMA buffer data
>> + * @load_addr: Starting address where IMA buffer is loaded at
>> + * @size: Number of bytes in the IMA buffer
>> + *
>> + * Use this function to pass on the IMA buffer information to
>> + * the next kernel across kexec system call.
>> + *
>> + * Return: 0 on success, negative errno on error.
>> + */
>> +int of_ima_add_kexec_buffer(struct kimage *image,
>> +			    unsigned long load_addr, size_t size)
>> +{
>> +	image->ima_buffer_addr = load_addr;
>> +	image->ima_buffer_size = size;
>> +
> 
> There's nothing DT specific about this function, so this is the wrong
> place for it. I would just remove it and directly set the members.

Will do.

  -lakshmi
diff mbox series

Patch

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 bdd0ddb9ac4d..ecf88533d6b4 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -112,11 +112,6 @@  struct kimage_arch {
 	unsigned long elf_headers_sz;
 	void *elf_headers;
 	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/drivers/of/kexec.c b/drivers/of/kexec.c
index 469e09613cdd..9f33d215b9f2 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -63,6 +63,29 @@  static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
 	return -ENOENT;
 }
 
+#ifdef CONFIG_IMA_KEXEC
+/**
+ * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
+ *
+ * @image: kimage struct to set IMA buffer data
+ * @load_addr: Starting address where IMA buffer is loaded at
+ * @size: Number of bytes in the IMA buffer
+ *
+ * Use this function to pass on the IMA buffer information to
+ * the next kernel across kexec system call.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int of_ima_add_kexec_buffer(struct kimage *image,
+			    unsigned long load_addr, size_t size)
+{
+	image->ima_buffer_addr = load_addr;
+	image->ima_buffer_size = size;
+
+	return 0;
+}
+#endif /* CONFIG_IMA_KEXEC */
+
 /*
  * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
  *
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 5f61389f5f36..75c670f0dfbb 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
 };
 
diff --git a/include/linux/of.h b/include/linux/of.h
index f0eff5e84353..03e0e694be29 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -573,6 +573,11 @@  void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
 				   unsigned long initrd_len,
 				   const char *cmdline);
 
+#ifdef CONFIG_IMA_KEXEC
+int of_ima_add_kexec_buffer(struct kimage *image,
+			    unsigned long load_addr, size_t size);
+#endif /* CONFIG_IMA_KEXEC */
+
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index e29bea3dd4cc..d346eed2d236 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
@@ -123,7 +124,7 @@  void ima_add_kexec_buffer(struct kimage *image)
 		return;
 	}
 
-	ret = arch_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
+	ret = of_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
 	if (ret) {
 		pr_err("Error passing over kexec measurement buffer.\n");
 		return;