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From: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
To: viro@ZenIV.linux.org.uk
Cc: linux-fsdevel@vger.kernel.org,
	Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Subject: [PATCH NOMERGE 08/13] fscrypt: Introduce charset-based matching functions
Date: Tue, 22 May 2018 17:38:13 -0300	[thread overview]
Message-ID: <20180522203818.14666-9-krisman@collabora.co.uk> (raw)
In-Reply-To: <20180522203818.14666-1-krisman@collabora.co.uk>

Changes since RFC v1:
  - Send length of both strings to comparison functions.
  - Change length type to size_t.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
---
 include/linux/fscrypt.h         |  1 +
 include/linux/fscrypt_notsupp.h | 16 ++++++++++++++++
 include/linux/fscrypt_supp.h    | 27 +++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)

diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
index 952ab97af325..96559f7bfc63 100644
--- a/include/linux/fscrypt.h
+++ b/include/linux/fscrypt.h
@@ -15,6 +15,7 @@
 #define _LINUX_FSCRYPT_H
 
 #include <linux/fs.h>
+#include <linux/nls.h>
 
 #define FS_CRYPTO_BLOCK_SIZE		16
 
diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index 44b50c04bae9..f38824aa3250 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -159,6 +159,22 @@ static inline bool fscrypt_match_name(const struct fscrypt_name *fname,
 	return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len);
 }
 
+static inline bool fscrypt_charset_match_name(struct nls_table *charset,
+					      const struct fscrypt_name *fname,
+					      const u8 *de_name,
+					      u32 de_name_len, bool ignorecase)
+{
+	if (!ignorecase) {
+		return !nls_strncmp(charset, (char *) de_name, de_name_len,
+				    fname->disk_name.name,
+				    fname->disk_name.len);
+	}
+
+	return !nls_strncasecmp(charset, (char *) de_name,
+				(size_t) de_name_len, fname->disk_name.name,
+				(size_t) fname->disk_name.len);
+}
+
 /* bio.c */
 static inline void fscrypt_decrypt_bio_pages(struct fscrypt_ctx *ctx,
 					     struct bio *bio)
diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
index 477a7a6504d2..8c55678ce9ce 100644
--- a/include/linux/fscrypt_supp.h
+++ b/include/linux/fscrypt_supp.h
@@ -187,6 +187,33 @@ static inline bool fscrypt_match_name(const struct fscrypt_name *fname,
 	return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len);
 }
 
+static inline bool fscrypt_charset_match_name(struct nls_table *charset,
+					      const struct fscrypt_name *fname,
+					      const u8 *de_name,
+					      u32 de_name_len, bool ignorecase)
+{
+	if (unlikely(!fname->disk_name.name)) {
+		const struct fscrypt_digested_name *n =
+			(const void *)fname->crypto_buf.name;
+		if (WARN_ON_ONCE(fname->usr_fname->name[0] != '_'))
+			return false;
+		if (de_name_len <= FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE)
+			return false;
+		return !memcmp(FSCRYPT_FNAME_DIGEST(de_name, de_name_len),
+			       n->digest, FSCRYPT_FNAME_DIGEST_SIZE);
+	}
+
+	if (!ignorecase) {
+		return !nls_strncmp(charset, (char *) de_name, de_name_len,
+				    fname->disk_name.name,
+				    fname->disk_name.len);
+	}
+
+	return !nls_strncasecmp(charset, (char *) de_name, de_name_len,
+				fname->disk_name.name,
+				fname->disk_name.len);
+}
+
 /* bio.c */
 extern void fscrypt_decrypt_bio_pages(struct fscrypt_ctx *, struct bio *);
 extern void fscrypt_pullback_bio_page(struct page **, bool);
-- 
2.17.0

  parent reply	other threads:[~2018-05-22 20:38 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-22 20:38 [PATCH NOMERGE 00/13] Case insensitiveness as a mountpoint Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 01/13] vfs: Add support for mounting with MS_CASEFOLD Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 02/13] vfs: Propagate LOOKUP_CASEFOLD after doing parent lookups Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 03/13] vfs: Add support for positive dentries CI lookups in the dentry cache Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 04/13] vfs: Allow bind,remount with MS_CASEFOLD Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 05/13] vfs: Handle case-exact lookup in d_add_ci Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 06/13] vfs: Add Support for hard negative dentries in the dcache Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 07/13] vfs: Handle MNT_CASEFOLD in /proc/mounts Gabriel Krisman Bertazi
2018-05-22 20:38 ` Gabriel Krisman Bertazi [this message]
2018-05-22 20:38 ` [PATCH NOMERGE 09/13] ext4: Include encoding information on the superblock Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 10/13] ext4: Plumb LOOK_CASEFOLD up to ext4 comparison functions Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 11/13] ext4: Support charset name matching Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 12/13] ext4: Implement ext4 dcache hooks for custom charsets Gabriel Krisman Bertazi
2018-05-22 20:38 ` [PATCH NOMERGE 13/13] ext4: Notify VFS of support for casefolded mountpoints Gabriel Krisman Bertazi

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