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-rw-r--r--arch/x86/kernel/hw_breakpoint.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index c149c7b29ac3..f859095c1b6c 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -32,6 +32,7 @@
#include <asm/processor.h>
#include <asm/debugreg.h>
#include <asm/user.h>
+#include <asm/desc.h>
/* Per cpu debug control register value */
DEFINE_PER_CPU(unsigned long, cpu_dr7);
@@ -237,13 +238,26 @@ static inline bool within_area(unsigned long addr, unsigned long end,
}
/*
- * Checks whether the range from addr to end, inclusive, overlaps the CPU
- * entry area range.
+ * Checks whether the range from addr to end, inclusive, overlaps the fixed
+ * mapped CPU entry area range or other ranges used for CPU entry.
*/
-static inline bool within_cpu_entry_area(unsigned long addr, unsigned long end)
+static inline bool within_cpu_entry(unsigned long addr, unsigned long end)
{
- return within_area(addr, end, CPU_ENTRY_AREA_BASE,
- CPU_ENTRY_AREA_TOTAL_SIZE);
+ int cpu;
+
+ /* CPU entry erea is always used for CPU entry */
+ if (within_area(addr, end, CPU_ENTRY_AREA_BASE,
+ CPU_ENTRY_AREA_TOTAL_SIZE))
+ return true;
+
+ for_each_possible_cpu(cpu) {
+ /* The original rw GDT is being used after load_direct_gdt() */
+ if (within_area(addr, end, (unsigned long)get_cpu_gdt_rw(cpu),
+ GDT_SIZE))
+ return true;
+ }
+
+ return false;
}
static int arch_build_bp_info(struct perf_event *bp,
@@ -257,12 +271,12 @@ static int arch_build_bp_info(struct perf_event *bp,
return -EINVAL;
/*
- * Prevent any breakpoint of any type that overlaps the
- * cpu_entry_area. This protects the IST stacks and also
+ * Prevent any breakpoint of any type that overlaps the CPU
+ * entry area and data. This protects the IST stacks and also
* reduces the chance that we ever find out what happens if
* there's a data breakpoint on the GDT, IDT, or TSS.
*/
- if (within_cpu_entry_area(attr->bp_addr, bp_end))
+ if (within_cpu_entry(attr->bp_addr, bp_end))
return -EINVAL;
hw->address = attr->bp_addr;

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