linux-kernel - Re: vmsplice exploits, stack protector and Makefiles

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Message-ID: <20080214074327.GD17552@uranus.ravnborg.org>
Date:	Thu, 14 Feb 2008 08:43:27 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	pageexec@...email.hu
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	torvalds@...ux-foundation.org
Subject: Re: vmsplice exploits, stack protector and Makefiles

> --- linux-2.6.24.2/arch/x86/kernel/Makefile_64	2008-01-24 23:58:37.000000000 
> +0100
> +++ linux-2.6.24.2-pax/arch/x86/kernel/Makefile_64	2008-02-13 
> 11:36:14.000000000 +0100
> @@ -42,4 +42,6 @@ obj-$(CONFIG_PCI)		+= early-quirks.o
>  obj-y				+= topology.o
>  obj-y				+= pcspeaker.o
>  
> -CFLAGS_vsyscall_64.o		:= $(PROFILING) -g0
> +CFLAGS_vsyscall_64.o		:= $(PROFILING) -g0 -fno-stack-protector
> +CFLAGS_hpet.o			:= -fno-stack-protector
> +CFLAGS_tsc_64.o			:= -fno-stack-protector

We should use:
nostackp := $(call cc-option, -fno-stack-protector)
+CFLAGS_vsyscall_64.o		:= $(PROFILING) -g0 $(nostackp)
+CFLAGS_hpet.o			:= $(nostackp)
+CFLAGS_tsc_64.o		:= $(nostackp)

(or somthing similar)

because we cannot rely on that all gcc versions has support
for -fno-stack-protector

	Sam
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