linux-kernel - Re: [PATCH 11/18] kprobes: disable kretprobes with SCS

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Date:   Fri, 18 Oct 2019 13:04:29 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-hardening@...ts.openwall.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH 11/18] kprobes: disable kretprobes with SCS


[ Added Masami ]

On Fri, 18 Oct 2019 09:10:26 -0700
Sami Tolvanen <samitolvanen@...gle.com> wrote:

> With CONFIG_KRETPROBES, function return addresses are modified to
> redirect control flow to kretprobe_trampoline. This is incompatible with
> return address protection.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> ---
>  arch/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/Kconfig b/arch/Kconfig
> index a222adda8130..4646e3b34925 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -171,7 +171,7 @@ config ARCH_USE_BUILTIN_BSWAP
>  
>  config KRETPROBES
>  	def_bool y
> -	depends on KPROBES && HAVE_KRETPROBES
> +	depends on KPROBES && HAVE_KRETPROBES && ROP_PROTECTION_NONE

Again, this belongs in the arch code.

-- Steve

>  
>  config USER_RETURN_NOTIFIER
>  	bool


diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 41a9b4257b72..65557d7e6b5e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -166,7 +166,7 @@ config ARM64
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_KPROBES
-	select HAVE_KRETPROBES
+	select HAVE_KRETPROBES if ROP_PROTECTION_NONE
 	select HAVE_GENERIC_VDSO
 	select IOMMU_DMA if IOMMU_SUPPORT
 	select IRQ_DOMAIN