linux-kernel - Re: [PATCH] x86/power/64: Use char arrays for asm function names

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Date:   Tue, 09 May 2017 23:18:56 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-pm@...r.kernel.org, Daniel Micay <danielmicay@...il.com>
Subject: Re: [PATCH] x86/power/64: Use char arrays for asm function names

On Tuesday, May 09, 2017 02:00:51 PM Kees Cook wrote:
> This switches the hibernate_64.S function names into character arrays
> to match other areas of the kernel where this is done (e.g., linker
> scripts). Specifically this fixes a compile-time error noticed by the
> future CONFIG_FORTIFY_SOURCE routines that complained about PAGE_SIZE
> being copied out of the "single byte" core_restore_code variable.
> 
> Additionally drops the "acpi_save_state_mem" exern which does not
> appear to be used anywhere else in the kernel.
> 
> Cc: Daniel Micay <danielmicay@...il.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Or I can queue this up if that's preferred.

> ---
>  arch/x86/include/asm/suspend_64.h | 5 ++---
>  arch/x86/power/hibernate_64.c     | 6 +++---
>  2 files changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/include/asm/suspend_64.h b/arch/x86/include/asm/suspend_64.h
> index 6136a18152af..2bd96b4df140 100644
> --- a/arch/x86/include/asm/suspend_64.h
> +++ b/arch/x86/include/asm/suspend_64.h
> @@ -42,8 +42,7 @@ struct saved_context {
>  	set_debugreg((thread)->debugreg##register, register)
>  
>  /* routines for saving/restoring kernel state */
> -extern int acpi_save_state_mem(void);
> -extern char core_restore_code;
> -extern char restore_registers;
> +extern char core_restore_code[];
> +extern char restore_registers[];
>  
>  #endif /* _ASM_X86_SUSPEND_64_H */
> diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c
> index 6a61194ffd58..2cc419990ab7 100644
> --- a/arch/x86/power/hibernate_64.c
> +++ b/arch/x86/power/hibernate_64.c
> @@ -147,7 +147,7 @@ static int relocate_restore_code(void)
>  	if (!relocated_restore_code)
>  		return -ENOMEM;
>  
> -	memcpy((void *)relocated_restore_code, &core_restore_code, PAGE_SIZE);
> +	memcpy((void *)relocated_restore_code, core_restore_code, PAGE_SIZE);
>  
>  	/* Make the page containing the relocated code executable */
>  	pgd = (pgd_t *)__va(read_cr3()) + pgd_index(relocated_restore_code);
> @@ -292,8 +292,8 @@ int arch_hibernation_header_save(void *addr, unsigned int max_size)
>  
>  	if (max_size < sizeof(struct restore_data_record))
>  		return -EOVERFLOW;
> -	rdr->jump_address = (unsigned long)&restore_registers;
> -	rdr->jump_address_phys = __pa_symbol(&restore_registers);
> +	rdr->jump_address = (unsigned long)restore_registers;
> +	rdr->jump_address_phys = __pa_symbol(restore_registers);
>  	rdr->cr3 = restore_cr3;
>  	rdr->magic = RESTORE_MAGIC;
>  
>