linux-kernel - Re: [syzbot] [hfs?] WARNING in hfs_write

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Message-ID: <5ef77167046ad0a3e6d05433411c995c245464a8.camel@physik.fu-berlin.de>
Date:   Fri, 21 Jul 2023 07:07:20 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Michael Schmitz <schmitzmic@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Viacheslav Dubeyko <slava@...eyko.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        syzbot <syzbot+7bb7cd3595533513a9e7@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        christian.brauner@...ntu.com,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Jeff Layton <jlayton@...nel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com,
        ZhangPeng <zhangpeng362@...wei.com>,
        linux-m68k@...ts.linux-m68k.org,
        debian-powerpc <debian-powerpc@...ts.debian.org>
Subject: Re: [syzbot] [hfs?] WARNING in hfs_write_inode

Hi Michael!

On Fri, 2023-07-21 at 07:05 +1200, Michael Schmitz wrote:
> Installing a new kernel to the HFS filesystem, or a boot loader like 
> yaboot, might be another matter. But there still is an user space option 
> like hfsutils or hfsplus.

Both won't work with GRUB. grub-install expects the boot partition to be
mounted while hfsutils/hfsplus don't use the VFS layer.

> That said, in terms of the argument about USB media with corrupt HFS 
> filesystems presenting a security risk, I take the view that once you 
> have physical access to a system, all bets are off. Doubly so if 
> auto-mounting USB media is enabled.

I also don't understand why this was brought up. There are so many other
potential options for attacking computer, even remotely. We also didn't
drop x86 support after all these CPU vulnerabilities were discovered, did
we?

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913