linux-kernel - Out-of-bounds access in vread

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Message-ID: <5396A772.1060103@nod.at>
Date:	Tue, 10 Jun 2014 08:36:34 +0200
From:	Richard Weinberger <richard@....at>
To:	Andy Lutomirski <luto@...capital.net>
CC:	the arch/x86 maintainers <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Out-of-bounds access in vread_hpet()

FYI:
________________________________________________________________________________________________________
*** CID 1222081:  Out-of-bounds access  (ARRAY_VS_SINGLETON)
/arch/x86/vdso/vclock_gettime.c: 38 in vread_hpet()
32     #ifdef CONFIG_HPET_TIMER
33     extern u8 hpet_page
34     	__attribute__((visibility("hidden")));
35
36     static notrace cycle_t vread_hpet(void)
37     {
>>>     CID 1222081:  Out-of-bounds access  (ARRAY_VS_SINGLETON)
>>>     Using "&hpet_page" as an array.  This might corrupt or misinterpret adjacent memory locations.
38     	return *(const volatile u32 *)(&hpet_page + HPET_COUNTER);
39     }
40     #endif
41
42     #ifndef BUILD_VDSO32
43

Thanks,
//richard
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