[PATCH v2 16/31] arm64: ELF definitions
From: Mike Frysinger <hidden>
Date: 2012-08-21 18:53:21
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On Tuesday 21 August 2012 14:27:31 Catalin Marinas wrote:
On Tue, Aug 21, 2012 at 07:17:19PM +0100, Geert Uytterhoeven wrote:quoted
On Tue, Aug 21, 2012 at 6:06 PM, Catalin Marinas wrote:quoted
But I can see on x86 that it always reports x86_64 even if the task is x86_32.Really? $ uname -m x86_64 $ linux32 uname -m i686 $Well, you set the personality explicitly with linux32. What I tested was with an x86_32 uname called directly (without linux32) and even though the ELF was a 32-bit one, it was reporting x86_64. In this AArch64 patch, a compat task was automatically setting the linux32 personality (which x86 does not do).
i don't think any arch does this. $ uname -m ppc64 $ linux32 uname -m ppc $ uname -m sparc64 $ linux32 uname -m sparc $ uname -m x86_64 $ linux32 uname -m i686 $ uname -m s390x $ linux32 uname -m s390
Arnd's point is that the ELF file should not affect the personality and hence the uname value. This should only be done by an explicit call to sys_personality().
correct. if someone really wants to launch their whole userland with the adjusted personality, they could always boot the kernel with: init=/usr/bin/linux32 /sbin/init but the kernel shouldn't be doing this automatically. -mike -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 836 bytes Desc: This is a digitally signed message part. URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20120821/0313a2db/attachment.sig>