linux-kernel - [PATCH v2] partitions/efi: Fix partition name parsing in GUID partition entry

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]

Message-Id: <20191224092119.4581-1-n.merinov@inango-systems.com>
Date:   Tue, 24 Dec 2019 14:21:19 +0500
From:   Nikolai Merinov <n.merinov@...ngo-systems.com>
To:     Davidlohr Bueso <dave@...olabs.net>, Jens Axboe <axboe@...nel.dk>,
        linux-efi@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Nikolai Merinov <n.merinov@...ngo-systems.com>
Subject: [PATCH v2] partitions/efi: Fix partition name parsing in GUID partition entry

GUID partition entry defined to have a partition name as 36 UTF-16LE
code units. This means that on big-endian platforms ASCII symbols
would be read with 0xXX00 efi_char16_t character code. In order to
correctly extract ASCII characters from a partition name field we
should be converted from 16LE to CPU architecture.

The problem exists on all big endian platforms.

Signed-off-by: Nikolai Merinov <n.merinov@...ngo-systems.com>

diff --git a/block/partitions/efi.c b/block/partitions/efi.c
index db2fef7dfc47..51287a8a3bea 100644
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -715,7 +715,7 @@ int efi_partition(struct parsed_partitions *state)
 				ARRAY_SIZE(ptes[i].partition_name));
 		info->volname[label_max] = 0;
 		while (label_count < label_max) {
-			u8 c = ptes[i].partition_name[label_count] & 0xff;
+			u8 c = le16_to_cpu(ptes[i].partition_name[label_count]) & 0xff;
 			if (c && !isprint(c))
 				c = '!';
 			info->volname[label_count] = c;
diff --git a/block/partitions/efi.h b/block/partitions/efi.h
index 3e8576157575..0b6d5b7be111 100644
--- a/block/partitions/efi.h
+++ b/block/partitions/efi.h
@@ -88,7 +88,7 @@ typedef struct _gpt_entry {
 	__le64 starting_lba;
 	__le64 ending_lba;
 	gpt_entry_attributes attributes;
-	efi_char16_t partition_name[72 / sizeof (efi_char16_t)];
+	__le16 partition_name[72 / sizeof (__le16)];
 } __packed gpt_entry;
 
 typedef struct _gpt_mbr_record {
-- 
2.17.1