linux-kernel - Re: Current utrace breaks UML

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: <20070526013513.E894D1F8511@magilla.localdomain>
Date:	Fri, 25 May 2007 18:35:13 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Jeff Dike <jdike@...toit.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Current utrace breaks UML

> UML, obviously.  Below is a smaller test.  orig_eax is wrong, so you
> can't read the system call number from the process.

Oops!  I overlooked the need to preserve the orig_eax value, though its
necessity is obvious.  This makes me wonder about those previous
reports that UML was working OK.

I refined the test case a little and that's in
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=241408

I've fixed this in the latest utrace patch set.  I also wired up
sysemu on x86_64.  This means 32-bit processes calling ptrace now
support it for full compatibility with native i386, which the vanilla
kernel does not.  It also means it works for 64-bit ptrace calls,
whether operating on a 64-bit or a 32-bit target process.

Thanks,
Roland
-
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/