linux-kernel - Re: [PATCH v3 4/4] selftests/x86: Add tests for UC_SIGCONTEXT_SS and UC_STRICT_RESTORE

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Message-ID: <20160211195342.GI5565@pd.tnic>
Date:	Thu, 11 Feb 2016 20:53:42 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Brian Gerst <brgerst@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Stas Sergeev <stsp@...t.ru>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [PATCH v3 4/4] selftests/x86: Add tests for UC_SIGCONTEXT_SS and
 UC_STRICT_RESTORE_SS

On Mon, Jan 25, 2016 at 01:34:15PM -0800, Andy Lutomirski wrote:
> This tests the two ABI-preserving cases that DOSEMU cares about, and
> it also explicitly tests the new UC_SIGCONTEXT_SS and
> UC_STRICT_RESTORE_SS flags.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  tools/testing/selftests/x86/sigreturn.c | 240 ++++++++++++++++++++++++++++----
>  1 file changed, 212 insertions(+), 28 deletions(-)
> 
> diff --git a/tools/testing/selftests/x86/sigreturn.c b/tools/testing/selftests/x86/sigreturn.c
> index b5aa1bab7416..43e840470e32 100644
> --- a/tools/testing/selftests/x86/sigreturn.c
> +++ b/tools/testing/selftests/x86/sigreturn.c
> @@ -55,6 +55,47 @@
>  #include <sys/user.h>
>  
>  /*
> + * Copied from asm/ucontext.h, as asm/ucontext.h conflicts badly with the glibc
> + * headers.
> + */
> +#ifdef __x86_64__
> +/*
> + * UC_SAVED_SS will be set when delivering 64-bit or x32 signals on
> + * kernels that save SS in the sigcontext.  Kernels that set UC_SAVED_SS
> + * allow signal handlers to set UC_RESTORE_SS; if UC_RESTORE_SS is set,
> + * then sigreturn will restore SS.
> + *
> + * For compatibility with old programs, the kernel will *not* set
> + * UC_RESTORE_SS when delivering signals.

Those UC_SAVED_SS and UC_RESTORE_SS look stale to me.

> + */
> +#define UC_SIGCONTEXT_SS       0x2
> +#define UC_STRICT_RESTORE_SS   0x4
> +#endif
> +
> +/* Access rights as returned by LAR */
> +#define AR_TYPE_RODATA		(0 * (1 << 9))
> +#define AR_TYPE_RWDATA		(1 * (1 << 9))
> +#define AR_TYPE_RODATA_EXPDOWN	(2 * (1 << 9))
> +#define AR_TYPE_RWDATA_EXPDOWN	(3 * (1 << 9))
> +#define AR_TYPE_XOCODE		(4 * (1 << 9))
> +#define AR_TYPE_XRCODE		(5 * (1 << 9))
> +#define AR_TYPE_XOCODE_CONF	(6 * (1 << 9))
> +#define AR_TYPE_XRCODE_CONF	(7 * (1 << 9))
> +#define AR_TYPE_MASK		(7 * (1 << 9))
> +
> +#define AR_DPL0			(0 * (1 << 13))
> +#define AR_DPL3			(3 * (1 << 13))
> +#define AR_DPL_MASK		(3 * (1 << 13))
> +
> +#define AR_A			(1 << 8)	/* A means "accessed" */
> +#define AR_S			(1 << 12)	/* S means "not system" */
> +#define AR_P			(1 << 15)	/* P means "present" */
> +#define AR_AVL			(1 << 20)	/* AVL does nothing */
> +#define AR_L			(1 << 21)	/* L means "long mode" */
> +#define AR_DB			(1 << 22)	/* D or B, depending on type */
> +#define AR_G			(1 << 23)	/* G means "limit in pages" */

Why not include the kernel header instead of repeating it here again?

-- 
Regards/Gruss,
    Boris.

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