linux-ext4 - [PATCH v2 4/7] ext4: Simplify hash check on ext4

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 28 Apr 2022 18:10:24 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org
Cc:     linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        ebiggers@...nel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH v2 4/7] ext4: Simplify hash check on ext4_match

The existence of fname->cf_name.name requires s_encoding & IS_CASEFOLDED,
therefore this can be simplified.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 fs/ext4/namei.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5102652b5af4..e450e52eef48 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1440,19 +1440,13 @@ static bool ext4_match(struct inode *parent,
 #endif
 
 #if IS_ENABLED(CONFIG_UNICODE)
-	if (parent->i_sb->s_encoding && IS_CASEFOLDED(parent) &&
-	    (!IS_ENCRYPTED(parent) || fscrypt_has_encryption_key(parent))) {
-		if (fname->cf_name.name) {
-			if (IS_ENCRYPTED(parent)) {
-				if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
-					fname->hinfo.minor_hash !=
-						EXT4_DIRENT_MINOR_HASH(de)) {
-
-					return false;
-				}
-			}
-		}
+	if (IS_ENCRYPTED(parent) && fname->cf_name.name) {
+		if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
+		    fname->hinfo.minor_hash != EXT4_DIRENT_MINOR_HASH(de))
+			return false;
+	}
 
+	if (parent->i_sb->s_encoding && IS_CASEFOLDED(parent)) {
 		u.folded_name = &fname->cf_name;
 		u.usr_name = fname->usr_fname;
 
-- 
2.35.1