"bibo,mao" <[email protected]> wrote:
>
> Hi,
> In x86_64 platform, INT1 and INT3 trap stack is IST stack called DEBUG_STACK,
> when INT1/INT3 trap happens, system will switch to DEBUG_STACK by hardware.
> Current DEBUG_STACK size is 4K, when int1/int3 trap happens, kernel will
> minus current DEBUG_STACK IST value by 4k. But if int3/int1 trap is nested,
> it will destroy other vector's IST stack. This patch modifies this, it sets
> DEBUG_STACK size as 8K and allows two level of nested int1/int3 trap.
>
> Kprobe DEBUG_STACK may be nested, because kprobe hanlder may be probed
> by other kprobes. This patch is against 2.6.17-rc3. Thanks jbeulich for pointing out error in the first patch.
>
> Signed-Off-By: bibo, mao <[email protected]>
>
> --- 2.6.17-rc3.org/include/asm-x86_64/page.h 2006-05-10 12:07:18.000000000 +0800
> +++ 2.6.17-rc3/include/asm-x86_64/page.h 2006-05-10 12:19:24.000000000 +0800
> @@ -20,7 +20,7 @@
> #define EXCEPTION_STACK_ORDER 0
> #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
>
> -#define DEBUG_STACK_ORDER EXCEPTION_STACK_ORDER
> +#define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
> #define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
>
> #define IRQSTACK_ORDER 2
So.... why not do it this way?
--- devel/include/asm-x86_64/page.h~x86_64-kprobes-debug_stack-nesting-fix 2006-05-11 04:15:12.000000000 -0700
+++ devel-akpm/include/asm-x86_64/page.h 2006-05-11 04:16:07.000000000 -0700
@@ -20,7 +20,15 @@
#define EXCEPTION_STACK_ORDER 0
#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
+#ifdef CONFIG_KPROBES
+/*
+ * kprobes uses an 8k stack because int1/int3 exceptions can nest
+ */
+#define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
+#else
#define DEBUG_STACK_ORDER EXCEPTION_STACK_ORDER
+#endif
+
#define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
#define IRQSTACK_ORDER 2
_
-
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