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Date: Mon, 11 Jan 2016 17:25:06 -0800 From: Andy Lutomirski <luto@...capital.net> To: Ingo Molnar <mingo@...nel.org> Cc: Shuah Khan <shuahkh@....samsung.com>, Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>, Borislav Petkov <bp@...en8.de>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] selftests/x86: Disable ldt_gdt_64 for now On Mon, Jan 11, 2016 at 2:59 AM, Ingo Molnar <mingo@...nel.org> wrote: > > * Shuah Khan <shuahkh@....samsung.com> wrote: > >> On 01/06/2016 12:51 PM, Andy Lutomirski wrote: >> > ldt_gdt.c relies on cross-cpu invalidation of SS to do one of its >> > tests. On 32-bit builds, this works fine, but on 64-bit builds, it >> > only works if the kernel has proper SS sigcontext handling for >> > 64-bit user programs. >> > >> > Since the SS fixes are currently reverted, restrict the test case to >> > 32 bits for now. >> > >> > In principle, I could change the test to use a different segment >> > register, but it would be messy: CS can't point to the LDT for >> > 64-bit code, and the other registers don't result in immediate >> > faults because they aren't reloaded on kernel -> user transitions. >> > >> > When we fix sigcontext (in 4.6?), we can revert this. >> > >> > Signed-off-by: Andy Lutomirski <luto@...nel.org> >> > -- >> >> Andy, >> >> This patch didn't apply to linux-kselftest next. >> It probably has to go through x86. > > It doesn't apply to -tip either. Andy, which tree is this against? Oops, it applies on top of a new self-test that I forgot to send. I send a v2 that should be better. I'll send the new selftest out as well once -tip catches up with all the vdso patches. --Andy
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