linux-kernel - [PATCH 1/3] partitions: efi: compare first and last usable LBAs

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>] [day] [month] [year] [list]

Message-ID: <1346836703.2559.4.camel@offbook>
Date:	Wed, 05 Sep 2012 11:18:23 +0200
From:	Davidlohr Bueso <dave@....org>
To:	Jens Axboe <axboe@...nel.dk>, Matt Domsch <Matt_Domsch@...l.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] partitions: efi: compare first and last usable LBAs

When verifying GPT header integrity, make sure that
first usable LBA is smaller than last usable LBA.

Signed-off-by: Davidlohr Bueso <dave@....org>
---
 block/partitions/efi.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/block/partitions/efi.c b/block/partitions/efi.c
index 6296b40..7795bb4 100644
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -344,6 +344,12 @@ static int is_gpt_valid(struct parsed_partitions *state, u64 lba,
 	 * within the disk.
 	 */
 	lastlba = last_lba(state->bdev);
+	if (le64_to_cpu((*gpt)->last_usable_lba) < le64_to_cpu((*gpt)->first_usable_lba)) {
+		pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
+			 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba));
+		goto fail;
+	}
 	if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
 		pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",
 			 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
-- 
1.7.4.1




--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/