linux-kernel - Incorrect alignment assumptions in x86

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Message-ID: <13065.1156489198@kao2.melbourne.sgi.com>
Date:	Fri, 25 Aug 2006 16:59:58 +1000
From:	Keith Owens <kaos@....com.au>
To:	linux-kernel@...r.kernel.org
Cc:	ak@...e.de
Subject: Incorrect alignment assumptions in x86_64 stacktrace

2.6.18-rc4 arch/x86_64/kernel/stacktrace.c::get_stack_end() incorrectly
assumes that the irqstackptr is IRQSTACKSIZE aligned.

	stack_end = (unsigned long)cpu_pda(cpu)->irqstackptr;
	if (stack_end) {
		stack_start = stack_end & ~(IRQSTACKSIZE-1);

irqstackptr is only guaranteed to be page aligned, not IRQSTACKSIZE
(4*PAGE_SIZE) aligned.

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