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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
This commit is contained in:
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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13
arch/x86/kernel/hw_breakpoint.c
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@ -227,14 +227,23 @@ int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw)
return (va >= TASK_SIZE_MAX) || ((va + len - 1) >= TASK_SIZE_MAX);
}
/*
* Checks whether the range [addr, end], overlaps the area [base, base + size).
*/
static inline bool within_area(unsigned long addr, unsigned long end,
unsigned long base, unsigned long size)
{
return end >= base && addr < (base + size);
}
/*
* Checks whether the range from addr to end, inclusive, overlaps the CPU
* entry area range.
*/
static inline bool within_cpu_entry_area(unsigned long addr, unsigned long end)
{
return end >= CPU_ENTRY_AREA_BASE &&
addr < (CPU_ENTRY_AREA_BASE + CPU_ENTRY_AREA_TOTAL_SIZE);
return within_area(addr, end, CPU_ENTRY_AREA_BASE,
CPU_ENTRY_AREA_TOTAL_SIZE);
}
static int arch_build_bp_info(struct perf_event *bp,