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

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Date:	Fri, 10 Apr 2009 21:50:09 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, x86 maintainers <x86@...nel.org>,
	Pavel Machek <pavel@....cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] x86: acpi/sleep.c saved_magic fix overflow

[Jaswinder Singh Rajput - Fri, Apr 10, 2009 at 11:06:55PM +0530]
| Impact: fix overflow
| 
| Constant 0x123456789abcdef0 is so big for a long.
| So using saved_magic 0x12345678 for both 32 and 64 bit.
| 
| Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
| ---
|  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;
|  }
| -- 
| 1.6.0.6
| 

Hi Jaswinder,

actually long on x86-64 is 8 bytes in size.

        Cyrill
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