i386: Disallow kprobes on NMI handlers

PATCH In review Fernando Luis Vázquez Cao 1 participant 1 message Aug 10, 2006

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Fernando Luis Vázquez Cao

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2006-08-10 10:36 UTC #0 lore raw

PATCH 2/2 i386: Disallow kprobes on NMI handlers

A kprobe executes IRET early and that could cause NMI recursion and stack corruption.

Note: This problem was originally identified by Andi Kleen. This patch
adds fixes not included in his original patch.

Signed-off-by Fernando Vazquez <[email protected]>

---

arch/i386/kernel/mca.c +4 -3

diff -urNp linux-2.6.18-rc4-orig/arch/i386/kernel/mca.c linux-2.6.18-rc4/arch/i386/kernel/mca.c
@@ -414,7 +414,8 @@ subsys_initcall(mca_init);
 
 /*--------------------------------------------------------------------*/
 
-static void mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
+static __kprobes void
+mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
 {
 	int slot = mca_dev->slot;

@@ -444,7 +445,7 @@ static void mca_handle_nmi_device(struct
 
 /*--------------------------------------------------------------------*/
 
-static int mca_handle_nmi_callback(struct device *dev, void *data)
+static int __kprobes mca_handle_nmi_callback(struct device *dev, void *data)
 {
 	struct mca_device *mca_dev = to_mca_device(dev);
 	unsigned char pos5;

@@ -462,7 +463,7 @@ static int mca_handle_nmi_callback(struc
 	return 0;
 }
 
-void mca_handle_nmi(void)
+void __kprobes mca_handle_nmi(void)
 {
 	/* First try - scan the various adapters and see if a specific
 	 * adapter was responsible for the error.