linux-kernel - [PATCH] evm: Change vfs_getxattr() with __vfs_getxattr() in evm_calc_hmac_or

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Date: Thu,  7 Mar 2024 13:22:39 +0100
From: Roberto Sassu <roberto.sassu@...weicloud.com>
To: zohar@...ux.ibm.com,
	dmitry.kasatkin@...il.com,
	eric.snowberg@...cle.com,
	paul@...l-moore.com,
	jmorris@...ei.org,
	serge@...lyn.com
Cc: linux-integrity@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Roberto Sassu <roberto.sassu@...wei.com>,
	stable@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Christian Brauner <brauner@...nel.org>,
	Seth Forshee <sforshee@...nel.org>
Subject: [PATCH] evm: Change vfs_getxattr() with __vfs_getxattr() in evm_calc_hmac_or_hash()

From: Roberto Sassu <roberto.sassu@...wei.com>

Use __vfs_getxattr() instead of vfs_getxattr(), in preparation for
deprecating using the vfs_ interfaces for retrieving fscaps.

__vfs_getxattr() is only used for debugging purposes, to check if kernel
space and user space see the same xattr value.

Cc: stable@...r.kernel.org # 5.14.x
Cc: linux-fsdevel@...r.kernel.org
Cc: Christian Brauner <brauner@...nel.org>
Cc: Seth Forshee (DigitalOcean) <sforshee@...nel.org>
Fixes: 907a399de7b0 ("evm: Check xattr size discrepancy between kernel and user")
Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 security/integrity/evm/evm_crypto.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index b1ffd4cc0b44..168d98c63513 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -278,8 +278,8 @@ static int evm_calc_hmac_or_hash(struct dentry *dentry,
 		if (size < 0)
 			continue;
 
-		user_space_size = vfs_getxattr(&nop_mnt_idmap, dentry,
-					       xattr->name, NULL, 0);
+		user_space_size = __vfs_getxattr(dentry, inode, xattr->name,
+						 NULL, 0);
 		if (user_space_size != size)
 			pr_debug("file %s: xattr %s size mismatch (kernel: %d, user: %d)\n",
 				 dentry->d_name.name, xattr->name, size,
-- 
2.34.1