diff mbox series

[v10,4/8] powerpc: Use ima kexec node functions

Message ID 20201204195149.611-5-nramas@linux.microsoft.com (mailing list archive)
State New, archived
Headers show
Series Carry forward IMA measurement log on kexec on ARM64 | expand

Commit Message

Lakshmi Ramasubramanian Dec. 4, 2020, 7:51 p.m. UTC 
do_get_kexec_buffer() and get_addr_size_cells() are called by
ima_get_kexec_buffer(), ima_free_kexec_buffer, and remove_ima_buffer()
to retrieve the address and size of the buffer used for carrying
forward the IMA measurement log across kexec system call. These
functions correctly handle a device tree property that is a child node
of the root node, but not anything other than the immediate root
child nodes.

Use the architecture independent functions get_ima_kexec_buffer()
and get_root_addr_size_cells() defined in "drivers/of/ima_kexec.c",
to get the address and size of the IMA measurement log buffer from
the device tree. Remove do_get_kexec_buffer() and get_addr_size_cells()
since they are not used anymore.

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>
---
 arch/powerpc/kexec/ima.c | 58 +++++-----------------------------------
 1 file changed, 7 insertions(+), 51 deletions(-)

Comments

Thiago Jung Bauermann Dec. 5, 2020, 7:51 p.m. UTC | #1 
Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> do_get_kexec_buffer() and get_addr_size_cells() are called by
> ima_get_kexec_buffer(), ima_free_kexec_buffer, and remove_ima_buffer()
> to retrieve the address and size of the buffer used for carrying
> forward the IMA measurement log across kexec system call. These
> functions correctly handle a device tree property that is a child node
> of the root node, but not anything other than the immediate root
> child nodes.
>
> Use the architecture independent functions get_ima_kexec_buffer()
> and get_root_addr_size_cells() defined in "drivers/of/ima_kexec.c",

s/ima_kexec.c/kexec.c/

> to get the address and size of the IMA measurement log buffer from
> the device tree. Remove do_get_kexec_buffer() and get_addr_size_cells()
> since they are not used anymore.
>
> 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>

Looks good. Thanks!

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

> ---
>  arch/powerpc/kexec/ima.c | 58 +++++-----------------------------------
>  1 file changed, 7 insertions(+), 51 deletions(-)
>
> diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
> index a36c39db4b1a..906e8212435d 100644
> --- a/arch/powerpc/kexec/ima.c
> +++ b/arch/powerpc/kexec/ima.c
> @@ -13,40 +13,6 @@
>  #include <linux/libfdt.h>
>  #include <asm/ima.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.
> @@ -56,16 +22,11 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
>   */
>  int ima_get_kexec_buffer(void **addr, size_t *size)
>  {
> -	int ret, len;
> +	int ret;
>  	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);
> +	ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size);
>  	if (ret)
>  		return ret;
>  
> @@ -89,7 +50,7 @@ int ima_free_kexec_buffer(void)
>  	if (!prop)
>  		return -ENOENT;
>  
> -	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
> +	ret = get_ima_kexec_buffer(NULL, 0, &addr, &size);
>  	if (ret)
>  		return ret;
>  
> @@ -98,7 +59,6 @@ int ima_free_kexec_buffer(void)
>  		return ret;
>  
>  	return memblock_free(addr, size);
> -
>  }
>  
>  /**
> @@ -112,19 +72,15 @@ int ima_free_kexec_buffer(void)
>   */
>  void remove_ima_buffer(void *fdt, int chosen_node)
>  {
> -	int ret, len;
> +	int ret;
>  	unsigned long addr;
>  	size_t size;
> -	const void *prop;
>  
> -	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
> -	if (!prop)
> +	ret = get_ima_kexec_buffer(fdt, chosen_node, &addr, &size);
> +	if (ret)
>  		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)
> @@ -191,7 +147,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
>  	if (!image->arch.ima_buffer_size)
>  		return 0;
>  
> -	ret = get_addr_size_cells(&addr_cells, &size_cells);
> +	ret = get_root_addr_size_cells(&addr_cells, &size_cells);
>  	if (ret)
>  		return ret;
Lakshmi Ramasubramanian Dec. 7, 2020, 1:54 a.m. UTC | #2 
On 12/5/20 11:51 AM, Thiago Jung Bauermann wrote:
> 
> Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:
> 
>> do_get_kexec_buffer() and get_addr_size_cells() are called by
>> ima_get_kexec_buffer(), ima_free_kexec_buffer, and remove_ima_buffer()
>> to retrieve the address and size of the buffer used for carrying
>> forward the IMA measurement log across kexec system call. These
>> functions correctly handle a device tree property that is a child node
>> of the root node, but not anything other than the immediate root
>> child nodes.
>>
>> Use the architecture independent functions get_ima_kexec_buffer()
>> and get_root_addr_size_cells() defined in "drivers/of/ima_kexec.c",
> 
> s/ima_kexec.c/kexec.c/
Thanks for catching this. I'll fix it.

> 
>> to get the address and size of the IMA measurement log buffer from
>> the device tree. Remove do_get_kexec_buffer() and get_addr_size_cells()
>> since they are not used anymore.
>>
>> 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>
> 
> Looks good. Thanks!
> 
> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

Thanks Thiago.

  -lakshmi

>> ---
>>   arch/powerpc/kexec/ima.c | 58 +++++-----------------------------------
>>   1 file changed, 7 insertions(+), 51 deletions(-)
>>
>> diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
>> index a36c39db4b1a..906e8212435d 100644
>> --- a/arch/powerpc/kexec/ima.c
>> +++ b/arch/powerpc/kexec/ima.c
>> @@ -13,40 +13,6 @@
>>   #include <linux/libfdt.h>
>>   #include <asm/ima.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.
>> @@ -56,16 +22,11 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
>>    */
>>   int ima_get_kexec_buffer(void **addr, size_t *size)
>>   {
>> -	int ret, len;
>> +	int ret;
>>   	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);
>> +	ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size);
>>   	if (ret)
>>   		return ret;
>>   
>> @@ -89,7 +50,7 @@ int ima_free_kexec_buffer(void)
>>   	if (!prop)
>>   		return -ENOENT;
>>   
>> -	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
>> +	ret = get_ima_kexec_buffer(NULL, 0, &addr, &size);
>>   	if (ret)
>>   		return ret;
>>   
>> @@ -98,7 +59,6 @@ int ima_free_kexec_buffer(void)
>>   		return ret;
>>   
>>   	return memblock_free(addr, size);
>> -
>>   }
>>   
>>   /**
>> @@ -112,19 +72,15 @@ int ima_free_kexec_buffer(void)
>>    */
>>   void remove_ima_buffer(void *fdt, int chosen_node)
>>   {
>> -	int ret, len;
>> +	int ret;
>>   	unsigned long addr;
>>   	size_t size;
>> -	const void *prop;
>>   
>> -	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
>> -	if (!prop)
>> +	ret = get_ima_kexec_buffer(fdt, chosen_node, &addr, &size);
>> +	if (ret)
>>   		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)
>> @@ -191,7 +147,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
>>   	if (!image->arch.ima_buffer_size)
>>   		return 0;
>>   
>> -	ret = get_addr_size_cells(&addr_cells, &size_cells);
>> +	ret = get_root_addr_size_cells(&addr_cells, &size_cells);
>>   	if (ret)
>>   		return ret;
> 
>
diff mbox series

Patch

diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index a36c39db4b1a..906e8212435d 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -13,40 +13,6 @@ 
 #include <linux/libfdt.h>
 #include <asm/ima.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.
@@ -56,16 +22,11 @@  static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
  */
 int ima_get_kexec_buffer(void **addr, size_t *size)
 {
-	int ret, len;
+	int ret;
 	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);
+	ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size);
 	if (ret)
 		return ret;
 
@@ -89,7 +50,7 @@  int ima_free_kexec_buffer(void)
 	if (!prop)
 		return -ENOENT;
 
-	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+	ret = get_ima_kexec_buffer(NULL, 0, &addr, &size);
 	if (ret)
 		return ret;
 
@@ -98,7 +59,6 @@  int ima_free_kexec_buffer(void)
 		return ret;
 
 	return memblock_free(addr, size);
-
 }
 
 /**
@@ -112,19 +72,15 @@  int ima_free_kexec_buffer(void)
  */
 void remove_ima_buffer(void *fdt, int chosen_node)
 {
-	int ret, len;
+	int ret;
 	unsigned long addr;
 	size_t size;
-	const void *prop;
 
-	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
-	if (!prop)
+	ret = get_ima_kexec_buffer(fdt, chosen_node, &addr, &size);
+	if (ret)
 		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)
@@ -191,7 +147,7 @@  int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (!image->arch.ima_buffer_size)
 		return 0;
 
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	ret = get_root_addr_size_cells(&addr_cells, &size_cells);
 	if (ret)
 		return ret;