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authorFernando Luis Vázquez Cao <fernando@oss.ntt.co.jp>2006-09-26 10:52:36 +0200
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 10:52:36 +0200
commit6f6b1e0477ccb2f25a9b045e38440347d2ce21c8 (patch)
tree691c53a8a7e1e6338d11bd3158618cbc44036a57 /arch
parente9dff0ee6694b2edd40b1b448cb786f6a7b02336 (diff)
[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 <fernando@intellilink.co.jp> Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/kernel/mca.c8
1 files changed, 5 insertions, 3 deletions
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 <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mca.h>
+#include <linux/kprobes.h>
#include <asm/system.h>
#include <asm/io.h>
#include <linux/proc_fs.h>
@@ -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.