x86/hw_breakpoint: Add within_area() to check data breakpoints

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Add a within_area() helper to checking whether the data breakpoints overlap
with cpu_entry_area.

It will be used to completely prevent data breakpoints on GDT, IDT, or TSS.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200526014221.2119-2-laijs@linux.alibaba.com
Link: https://lkml.kernel.org/r/20200529213320.784524504@infradead.org

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Lai Jiangshan 2020-05-29 23:27:29 +02:00 • committed by Thomas Gleixner

parent 998c2034c6

commit d390e6de89

1 changed files with 11 additions and 2 deletions

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arch/x86/kernel/hw_breakpoint.c

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