linux-kernel - Re: [GIT PULL] f2fs updates for v4.6

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:	Sat, 26 Mar 2016 01:10:07 -0500
From:	Eric Biggers <ebiggers3@...il.com>
To:	Jaegeuk Kim <jaegeuk@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux FS Dev Mailing List <linux-fsdevel@...r.kernel.org>,
	Linux F2FS Dev Mailing List 
	<linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [GIT PULL] f2fs updates for v4.6

Why was the XTS tweak initialization changed in commit 0b81d0779072 ("fs crypto:
move per-file encryption from f2fs tree to fs/crypto")?

Old code:

       memcpy(xts_tweak, &index, sizeof(index));
       memset(&xts_tweak[sizeof(index)], 0,
                       F2FS_XTS_TWEAK_SIZE - sizeof(index));

New code:
       memcpy(xts_tweak, &inode->i_ino, sizeof(index));
       memset(&xts_tweak[sizeof(index)], 0,
                       FS_XTS_TWEAK_SIZE - sizeof(index));

Now the XTS tweak is the same for all pages of each inode.