x86 setup: guard the heap against invalid stack setups

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If we use the bootloader-provided stack pointer, we might end up in a
situation where the bootloader (incorrectly) pointed the stack in the
middle of our heap.  Catch this by simply comparing the computed heap
end value to the stack pointer minus the defined stack size.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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H. Peter Anvin 2008-01-30 13:33:04 +01:00 • committed by Ingo Molnar

parent 1a8514e04e

commit acd644bb4a

1 changed files with 18 additions and 6 deletions

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arch/x86/boot/main.c

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