linux-kernel - Re: [PATCH v3 01/12] ELF: UAPI and Kconfig additions for ELF program properties

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Date:   Tue, 29 Oct 2019 16:07:57 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Dave Martin <Dave.Martin@....com>
Cc:     linux-kernel@...r.kernel.org, Andrew Jones <drjones@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Kristina Martšenko <kristina.martsenko@....com>,
        Marc Zyngier <maz@...nel.org>, Mark Brown <broonie@...nel.org>,
        Paul Elliott <paul.elliott@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Richard Henderson <richard.henderson@...aro.org>,
        Sudakshina Das <sudi.das@....com>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Amit Kachhap <amit.kachhap@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 01/12] ELF: UAPI and Kconfig additions for ELF program
 properties

On Fri, Oct 18, 2019 at 06:25:34PM +0100, Dave Martin wrote:
> Pull the basic ELF definitions relating to the
> NT_GNU_PROPERTY_TYPE_0 note from Yu-Cheng Yu's earlier x86 shstk
> series.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> Signed-off-by: Dave Martin <Dave.Martin@....com>
> ---
>  fs/Kconfig.binfmt        | 3 +++
>  include/linux/elf.h      | 8 ++++++++
>  include/uapi/linux/elf.h | 1 +
>  3 files changed, 12 insertions(+)
> 
> diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
> index 62dc4f5..d2cfe07 100644
> --- a/fs/Kconfig.binfmt
> +++ b/fs/Kconfig.binfmt
> @@ -36,6 +36,9 @@ config COMPAT_BINFMT_ELF
>  config ARCH_BINFMT_ELF_STATE
>  	bool
>  
> +config ARCH_USE_GNU_PROPERTY
> +	bool
> +
>  config BINFMT_ELF_FDPIC
>  	bool "Kernel support for FDPIC ELF binaries"
>  	default y if !BINFMT_ELF
> diff --git a/include/linux/elf.h b/include/linux/elf.h
> index e3649b3..459cddc 100644
> --- a/include/linux/elf.h
> +++ b/include/linux/elf.h
> @@ -2,6 +2,7 @@
>  #ifndef _LINUX_ELF_H
>  #define _LINUX_ELF_H
>  
> +#include <linux/types.h>
>  #include <asm/elf.h>
>  #include <uapi/linux/elf.h>
>  
> @@ -56,4 +57,11 @@ static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) {
>  extern int elf_coredump_extra_notes_size(void);
>  extern int elf_coredump_extra_notes_write(struct coredump_params *cprm);
>  #endif
> +
> +/* NT_GNU_PROPERTY_TYPE_0 header */
> +struct gnu_property {
> +	u32 pr_type;
> +	u32 pr_datasz;
> +};
> +
>  #endif /* _LINUX_ELF_H */
> diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
> index 34c02e4..c377314 100644
> --- a/include/uapi/linux/elf.h
> +++ b/include/uapi/linux/elf.h
> @@ -36,6 +36,7 @@ typedef __s64	Elf64_Sxword;
>  #define PT_LOPROC  0x70000000
>  #define PT_HIPROC  0x7fffffff
>  #define PT_GNU_EH_FRAME		0x6474e550
> +#define PT_GNU_PROPERTY		0x6474e553
>  
>  #define PT_GNU_STACK	(PT_LOOS + 0x474e551)
>  
> -- 
> 2.1.4
> 

-- 
Kees Cook