[PATCH] crash_dump: use sysfs_emit in sysfs show functions

[PATCH] crash_dump: use sysfs_emit in sysfs show functions

[Thorsten Blum]

Replace sprintf() with sysfs_emit() in sysfs show functions.
sysfs_emit() is preferred for formatting sysfs output because it
provides safer bounds checking.  No functional changes.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
 kernel/crash_dump_dm_crypt.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel/crash_dump_dm_crypt.c b/kernel/crash_dump_dm_crypt.c
index 1f4067fbdb94..827572aa800b 100644
--- a/kernel/crash_dump_dm_crypt.c
+++ b/kernel/crash_dump_dm_crypt.c
@@ -6,6 +6,7 @@
 #include <linux/cc_platform.h>
 #include <linux/configfs.h>
 #include <linux/module.h>
+#include <linux/sysfs.h>
 
 #define KEY_NUM_MAX 128	/* maximum dm crypt keys */
 #define KEY_SIZE_MAX 256	/* maximum dm crypt key size */
@@ -189,7 +190,7 @@ static inline struct config_key *to_config_key(struct config_item *item)
 
 static ssize_t config_key_description_show(struct config_item *item, char *page)
 {
-	return sprintf(page, "%s\n", to_config_key(item)->description);
+	return sysfs_emit(page, "%s\n", to_config_key(item)->description);
 }
 
 static ssize_t config_key_description_store(struct config_item *item,
@@ -265,7 +266,7 @@ static struct config_item *config_keys_make_item(struct config_group *group,
 
 static ssize_t config_keys_count_show(struct config_item *item, char *page)
 {
-	return sprintf(page, "%d\n", key_count);
+	return sysfs_emit(page, "%d\n", key_count);
 }
 
 CONFIGFS_ATTR_RO(config_keys_, count);
@@ -274,7 +275,7 @@ static bool is_dm_key_reused;
 
 static ssize_t config_keys_reuse_show(struct config_item *item, char *page)
 {
-	return sprintf(page, "%d\n", is_dm_key_reused);
+	return sysfs_emit(page, "%d\n", is_dm_key_reused);
 }
 
 static ssize_t config_keys_reuse_store(struct config_item *item,
@@ -321,7 +322,7 @@ static bool restore;
 
 static ssize_t config_keys_restore_show(struct config_item *item, char *page)
 {
-	return sprintf(page, "%d\n", restore);
+	return sysfs_emit(page, "%d\n", restore);
 }
 
 static ssize_t config_keys_restore_store(struct config_item *item,
-- 
Thorsten Blum <thorsten.blum@linux.dev>
GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4

Re: [PATCH] crash_dump: use sysfs_emit in sysfs show functions

[Baoquan He]

On 03/01/26 at 01:51pm, Thorsten Blum wrote:
> Replace sprintf() with sysfs_emit() in sysfs show functions.
> sysfs_emit() is preferred for formatting sysfs output because it
> provides safer bounds checking.  No functional changes.
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
> ---
>  kernel/crash_dump_dm_crypt.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)

Acked-by: Baoquan He <bhe@redhat.com>

> 
> diff --git a/kernel/crash_dump_dm_crypt.c b/kernel/crash_dump_dm_crypt.c
> index 1f4067fbdb94..827572aa800b 100644
> --- a/kernel/crash_dump_dm_crypt.c
> +++ b/kernel/crash_dump_dm_crypt.c
> @@ -6,6 +6,7 @@
>  #include <linux/cc_platform.h>
>  #include <linux/configfs.h>
>  #include <linux/module.h>
> +#include <linux/sysfs.h>
>  
>  #define KEY_NUM_MAX 128	/* maximum dm crypt keys */
>  #define KEY_SIZE_MAX 256	/* maximum dm crypt key size */
> @@ -189,7 +190,7 @@ static inline struct config_key *to_config_key(struct config_item *item)
>  
>  static ssize_t config_key_description_show(struct config_item *item, char *page)
>  {
> -	return sprintf(page, "%s\n", to_config_key(item)->description);
> +	return sysfs_emit(page, "%s\n", to_config_key(item)->description);
>  }
>  
>  static ssize_t config_key_description_store(struct config_item *item,
> @@ -265,7 +266,7 @@ static struct config_item *config_keys_make_item(struct config_group *group,
>  
>  static ssize_t config_keys_count_show(struct config_item *item, char *page)
>  {
> -	return sprintf(page, "%d\n", key_count);
> +	return sysfs_emit(page, "%d\n", key_count);
>  }
>  
>  CONFIGFS_ATTR_RO(config_keys_, count);
> @@ -274,7 +275,7 @@ static bool is_dm_key_reused;
>  
>  static ssize_t config_keys_reuse_show(struct config_item *item, char *page)
>  {
> -	return sprintf(page, "%d\n", is_dm_key_reused);
> +	return sysfs_emit(page, "%d\n", is_dm_key_reused);
>  }
>  
>  static ssize_t config_keys_reuse_store(struct config_item *item,
> @@ -321,7 +322,7 @@ static bool restore;
>  
>  static ssize_t config_keys_restore_show(struct config_item *item, char *page)
>  {
> -	return sprintf(page, "%d\n", restore);
> +	return sysfs_emit(page, "%d\n", restore);
>  }
>  
>  static ssize_t config_keys_restore_store(struct config_item *item,
> -- 
> Thorsten Blum <thorsten.blum@linux.dev>
> GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4
> 
>