linux-kernel - Re: [PATCH v2] x86/asm/entry/32, selftests: Add test_syscall

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Date:	Sat, 13 Jun 2015 08:39:41 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86/asm/entry/32, selftests: Add test_syscall_vdso
 test


* Denys Vlasenko <dvlasenk@...hat.com> wrote:

> The test is fairly simplistic: it checks that all registers
> are preserved across 32-bit syscall via VDSO.
> 
> Run-tested:
> 
> $ ./test_syscall_vdso_32
> [RUN]	Executing 6-argument 32-bit syscall via VDSO
> [Ok]	Arguments are preserved across syscall
> [RUN]	Executing 6-argument 32-bit syscall via INT 80
> [Ok]	Arguments are preserved across syscall
> [RUN]	Running tests under ptrace
> [RUN]	Executing 6-argument 32-bit syscall via VDSO
> [Ok]	Arguments are preserved across syscall
> [RUN]	Executing 6-argument 32-bit syscall via INT 80
> [Ok]	Arguments are preserved across syscall

Just curious: is there a kernel sha1 where this test would fail? Or did you try to 
provoke an information leak perhaps?

Thanks,

	Ingo
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