linux-kernel - Re: [PATCH v6 14/19] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

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: <1608639.5Yic1PH469@wuerfel>
Date:	Tue, 01 Dec 2015 12:30:56 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Andreas Schwab <schwab@...e.de>
Cc:	Yury Norov <ynorov@...iumnetworks.com>,
	linux-arm-kernel@...ts.infradead.org, pinskia@...il.com,
	Prasun.Kapoor@...iumnetworks.com, catalin.marinas@....com,
	Nathan_Lynch@...tor.com, linux-kernel@...r.kernel.org,
	agraf@...e.de, klimov.linux@...il.com, broonie@...nel.org,
	jan.dakinevich@...il.com, joseph@...esourcery.com,
	ddaney.cavm@...il.com, bamvor.zhangjian@...wei.com,
	philipp.tomsich@...obroma-systems.com, andrey.konovalov@...aro.org,
	christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH v6 14/19] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

On Tuesday 01 December 2015 12:01:12 Andreas Schwab wrote:
> Arnd Bergmann <arnd@...db.de> writes:
> 
> > On Tuesday 01 December 2015 10:20:59 Andreas Schwab wrote:
> >> Yury Norov <ynorov@...iumnetworks.com> writes:
> >> 
> >> > There's a tricky bug with signal stack, that Andreas also discovered.
> >> 
> >> That was only a confusion about the compat state of sys_rt_sigaction.
> >> It just requires making sure glibc uses the correct (64bit layout)
> >> struct kernel_sigaction.
> >
> > I don't think we need to use the 64-bit version of sigaction, both
> > kernel and libc are simpler if we use the normal 32-bit version.
> 
> Since glibc has to do the conversion anyway (due to sigset_t), using the
> 64bit layout avoids a second conversion in the kernel.

I don't get the part about sigset_t. Why would glibc want to use the
64-bit layout? This one looks like one of the cases where we absolutely
want to use the 32-bit layout or otherwise get into big trouble if
we ever want to support native ILP32 kernels.

	Arnd
--
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/