From: Nathan_Lynch@mentor.com (Nathan Lynch)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v6 0/6] ARM: vdso gettimeofday using generic timer architecture
Date: Thu, 24 Apr 2014 13:41:45 -0500 [thread overview]
Message-ID: <53595AE9.5000506@mentor.com> (raw)
In-Reply-To: <20140424162229.GU26756@n2100.arm.linux.org.uk>
On 04/24/2014 11:22 AM, Russell King - ARM Linux wrote:
>
> The obvious question therefore is, if the dynamic linker throws its toys
> out if it encounters a wrong-float-ABI library during a standard library
> search, why would it _not_ throw its toys out on dlsym. The difference
> in behaviour would to me seem to be a bug - both should behave the same,
> though of course not throwing its toys out, but instead producing an error
> _or_ accepting the difference. Given that it's an ABI difference,
> rejecting the library is the only sane approach.
The VDSO would appear to not be subject to the same validation that a
file-based DSO is. I'll dig deeper into this to understand exactly
what's going on, but I have a guess as to why the VDSO happens to work
with armhf userspace: the calling convention is different only for
floating point arguments, and there are none in the VDSO routines.
next prev parent reply other threads:[~2014-04-24 18:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-23 0:48 [PATCH v6 0/6] ARM: vdso gettimeofday using generic timer architecture Nathan Lynch
2014-04-23 0:48 ` [PATCH v6 1/6] ARM: place sigpage at a random offset above stack Nathan Lynch
2014-04-23 0:48 ` [PATCH v6 2/6] ARM: allow user access to arch timer virtual counter Nathan Lynch
2014-04-23 17:32 ` Will Deacon
2014-04-23 17:41 ` Nathan Lynch
2014-04-24 10:18 ` Will Deacon
2014-04-23 0:48 ` [PATCH v6 3/6] ARM: miscellaneous vdso infrastructure, preparation Nathan Lynch
2014-04-23 0:48 ` [PATCH v6 4/6] ARM: add vdso user-space code Nathan Lynch
2014-04-23 0:48 ` [PATCH v6 5/6] ARM: vdso initialization, mapping, and synchronization Nathan Lynch
2014-04-23 0:48 ` [PATCH v6 6/6] ARM: add CONFIG_VDSO Kconfig and Makefile bits Nathan Lynch
2014-04-23 19:45 ` [PATCH v6 0/6] ARM: vdso gettimeofday using generic timer architecture Stephen Boyd
2014-04-24 2:28 ` Nathan Lynch
2014-04-24 17:00 ` Stephen Boyd
2014-04-23 21:50 ` Russell King - ARM Linux
2014-04-24 7:37 ` Ard Biesheuvel
2014-04-24 15:15 ` Nathan Lynch
2014-04-24 15:25 ` Ard Biesheuvel
2014-04-24 14:59 ` Nathan Lynch
2014-04-24 16:22 ` Russell King - ARM Linux
2014-04-24 18:41 ` Nathan Lynch [this message]
2014-04-24 18:45 ` Russell King - ARM Linux
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