linux-kernel - Re: [PATCH -tip] x86: acpi/sleep.c saved

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Message-ID: <20090410175545.GB16843@elf.ucw.cz>
Date:	Fri, 10 Apr 2009 19:55:45 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] x86: acpi/sleep.c saved_magic fix overflow

On Fri 2009-04-10 23:06:55, Jaswinder Singh Rajput wrote:
> Impact: fix overflow

> Constant 0x123456789abcdef0 is so big for a long.
> So using saved_magic 0x12345678 for both 32 and 64 bit.

Have you tested the patch? I have feeling that this is tested from
assembly... Plus it is only set to long constant on 64-bit, so I don't
think you are fixing anything. And if your code is correct the
variable is write only...

> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>

NAK.

									Pavel
> ---
>  arch/x86/kernel/acpi/sleep.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
> index 7c243a2..1ad317a 100644
> --- a/arch/x86/kernel/acpi/sleep.c
> +++ b/arch/x86/kernel/acpi/sleep.c
> @@ -94,7 +94,6 @@ int acpi_save_state_mem(void)
>  #ifndef CONFIG_64BIT
>  	header->pmode_entry = (u32)&wakeup_pmode_return;
>  	header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
> -	saved_magic = 0x12345678;
>  #else /* CONFIG_64BIT */
>  	header->trampoline_segment = setup_trampoline() >> 4;
>  #ifdef CONFIG_SMP
> @@ -104,8 +103,8 @@ int acpi_save_state_mem(void)
>  	initial_gs = per_cpu_offset(smp_processor_id());
>  #endif
>  	initial_code = (unsigned long)wakeup_long64;
> -	saved_magic = 0x123456789abcdef0;
>  #endif /* CONFIG_64BIT */
> +	saved_magic = 0x12345678;
>  
>  	return 0;
>  }

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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