linux-kernel - Re: Memory corruption due to word sharing

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 01 Feb 2012 13:04:01 -0600
From:	Peter Bergner <bergner@...t.ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	matz@...e.de, jkosina@...e.cz, torvalds@...ux-foundation.org,
	walters@...bum.org, jack@...e.cz, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, dsterba@...e.cz, ptesarik@...e.cz,
	rguenther@...e.de, gcc@....gnu.org
Subject: Re: Memory corruption due to word sharing

On Wed, 2012-02-01 at 13:09 -0500, David Miller wrote:
> From: Michael Matz <matz@...e.de>
> Date: Wed, 1 Feb 2012 18:41:05 +0100 (CET)
> 
> > One problem is that it's not a new problem, GCC emitted similar code since 
> > about forever, and still they turned up only now (well, probably because 
> > ia64 is dead, but sparc64 should have similar problems). 
> 
> Indeed, on sparc64 it does do the silly 64-bit access too:
> 
> wrong:
>         ldx     [%o0+8], %g2
>         sethi   %hi(2147483648), %g1
>         or      %g2, %g1, %g1
>         jmp     %o7+8
>          stx    %g1, [%o0+8]

Ditto for powerpc64-linux:

        ld 9,8(3)
        li 10,1
        rldimi 9,10,31,32
        std 9,8(3)
        blr


Peter



--
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/