diff mbox

[v23,10/22] posix_acl: Improve xattr fixup code

Message ID 1467294433-3222-11-git-send-email-agruenba@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Andreas Gruenbacher June 30, 2016, 1:47 p.m. UTC 
Both XATTR_NAME_POSIX_ACL_ACCESS and XATTR_NAME_POSIX_ACL_DEFAULT have
the same XATTR_SYSTEM_PREFIX prefix; don't check for the same prefix
repeatedly.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Steve French <steve.french@primarydata.com>
---
 fs/xattr.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

Comments

Jeff Layton July 5, 2016, 3:38 p.m. UTC | #1 
On Thu, 2016-06-30 at 15:47 +0200, Andreas Gruenbacher wrote:
> Both XATTR_NAME_POSIX_ACL_ACCESS and XATTR_NAME_POSIX_ACL_DEFAULT have
> the same XATTR_SYSTEM_PREFIX prefix; don't check for the same prefix
> repeatedly.
> 
> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
> Reviewed-by: Steve French <steve.french@primarydata.com>
> ---
>  fs/xattr.c | 29 +++++++++++++++++++++++------
>  1 file changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/xattr.c b/fs/xattr.c
> index 4beafc4..61ac218 100644
> --- a/fs/xattr.c
> +++ b/fs/xattr.c
> @@ -295,6 +295,16 @@ out:
>  }
>  EXPORT_SYMBOL_GPL(vfs_removexattr);
>  
> +static void
> +fix_xattr_from_user(const char *kname, void *kvalue, size_t size)
> +{
> +	if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
> +		return;
> +	kname += XATTR_SYSTEM_PREFIX_LEN;
> +	if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
> +	    !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
> +		posix_acl_fix_xattr_from_user(kvalue, size);
> +}
>  
>  /*
>   * Extended attribute SET operations
> @@ -329,9 +339,7 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
>  			error = -EFAULT;
>  			goto out;
>  		}
> -		if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
> -		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
> -			posix_acl_fix_xattr_from_user(kvalue, size);
> +		fix_xattr_from_user(kname, kvalue, size);
>  	}
>  
>  	error = vfs_setxattr(d, kname, kvalue, size, flags);
> @@ -396,6 +404,17 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
>  	return error;
>  }
>  
> +static void
> +fix_xattr_to_user(const char *kname, void *kvalue, size_t size)
> +{
> +	if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
> +		return;
> +	kname += XATTR_SYSTEM_PREFIX_LEN;
> +	if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
> +	    !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
> +		posix_acl_fix_xattr_to_user(kvalue, size);
> +}
> +
>  /*
>   * Extended attribute GET operations
>   */
> @@ -426,9 +445,7 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
>  
>  	error = vfs_getxattr(d, kname, kvalue, size);
>  	if (error > 0) {
> -		if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
> -		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
> -			posix_acl_fix_xattr_to_user(kvalue, size);
> +		fix_xattr_to_user(kname, kvalue, size);
>  		if (size && copy_to_user(value, kvalue, error))
>  			error = -EFAULT;
>  	} else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {

Might be nice to move this one to the head of the queue. I don't see it
as being a controversial change, and it could go in before the rest of
the patches.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
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diff mbox

Patch

diff --git a/fs/xattr.c b/fs/xattr.c
index 4beafc4..61ac218 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -295,6 +295,16 @@  out:
 }
 EXPORT_SYMBOL_GPL(vfs_removexattr);
 
+static void
+fix_xattr_from_user(const char *kname, void *kvalue, size_t size)
+{
+	if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+		return;
+	kname += XATTR_SYSTEM_PREFIX_LEN;
+	if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
+	    !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
+		posix_acl_fix_xattr_from_user(kvalue, size);
+}
 
 /*
  * Extended attribute SET operations
@@ -329,9 +339,7 @@  setxattr(struct dentry *d, const char __user *name, const void __user *value,
 			error = -EFAULT;
 			goto out;
 		}
-		if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
-		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
-			posix_acl_fix_xattr_from_user(kvalue, size);
+		fix_xattr_from_user(kname, kvalue, size);
 	}
 
 	error = vfs_setxattr(d, kname, kvalue, size, flags);
@@ -396,6 +404,17 @@  SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
 	return error;
 }
 
+static void
+fix_xattr_to_user(const char *kname, void *kvalue, size_t size)
+{
+	if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+		return;
+	kname += XATTR_SYSTEM_PREFIX_LEN;
+	if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
+	    !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
+		posix_acl_fix_xattr_to_user(kvalue, size);
+}
+
 /*
  * Extended attribute GET operations
  */
@@ -426,9 +445,7 @@  getxattr(struct dentry *d, const char __user *name, void __user *value,
 
 	error = vfs_getxattr(d, kname, kvalue, size);
 	if (error > 0) {
-		if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
-		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
-			posix_acl_fix_xattr_to_user(kvalue, size);
+		fix_xattr_to_user(kname, kvalue, size);
 		if (size && copy_to_user(value, kvalue, error))
 			error = -EFAULT;
 	} else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {