linux-kernel - Re: [PATCHv10 2/2] selftest/x86: add mremap vdso test

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Message-ID: <20160708121704.GA31371@gmail.com>
Date:	Fri, 8 Jul 2016 14:17:04 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dmitry Safonov <dsafonov@...tuozzo.com>
Cc:	linux-kernel@...r.kernel.org, 0x7f454c46@...il.com,
	mingo@...hat.com, luto@...nel.org, linux-mm@...ck.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Shuah Khan <shuahkh@....samsung.com>, x86@...nel.org,
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCHv10 2/2] selftest/x86: add mremap vdso test


* Dmitry Safonov <dsafonov@...tuozzo.com> wrote:

> Or print that mremap for vDSO is unsupported:
> [root@...alhost ~]# ./test_mremap_vdso_32
> 	AT_SYSINFO_EHDR is 0xf773c000
> [NOTE]	Moving vDSO: [0xf773c000, 0xf773d000] -> [0xf7737000, 0xf7738000]
> [FAIL]	mremap() of the vDSO does not work on this kernel!

Hm, I tried this on a 64-bit kernel and got:

triton:~/tip/tools/testing/selftests/x86> ./test_mremap_vdso_32 
        AT_SYSINFO_EHDR is 0xf7773000
[NOTE]  Moving vDSO: [0xf7773000, 0xf7774000] -> [0xf776e000, 0xf776f000]
Segmentation fault

Thanks,

	Ingo