From: Fernando Luis Vázquez Cao Date: Tue, 26 Sep 2006 08:52:36 +0000 (+0200) Subject: [PATCH] i386: Disallow kprobes on NMI handlers X-Git-Tag: v2.6.19-rc1~1077^2~80 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=6f6b1e0477ccb2f25a9b045e38440347d2ce21c8;p=linux-2.6-omap-h63xx.git [PATCH] 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 spotted by Andi Kleen. This patch adds fixes not included in his original patch. [AK: Jan Beulich originally discovered these classes of bugs] Signed-off-by: Fernando Vazquez Signed-off-by: Andi Kleen --- diff --git a/arch/i386/kernel/mca.c b/arch/i386/kernel/mca.c index cd5456f14af..eb57a851789 100644 --- a/arch/i386/kernel/mca.c +++ b/arch/i386/kernel/mca.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include #include @@ -414,7 +415,8 @@ 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 +446,7 @@ static void mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag) /*--------------------------------------------------------------------*/ -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 +464,7 @@ static int mca_handle_nmi_callback(struct device *dev, void *data) 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.