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authorKeshavamurthy Anil S <anil.s.keshavamurthy@intel.com>2005-06-27 15:17:16 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-27 15:23:54 -0700
commitc7b645f934e52a54af58142d91fb51f881f8ce26 (patch)
tree97ef8305edf17c07b7e0cc63453548e99e84b8fd /arch/ia64/kernel/kprobes.c
parenta528e21c235862cc1ae50e7809eb9116dc40ea0c (diff)
downloadop-kernel-dev-c7b645f934e52a54af58142d91fb51f881f8ce26.zip
op-kernel-dev-c7b645f934e52a54af58142d91fb51f881f8ce26.tar.gz
[PATCH] kprobes/ia64: refuse kprobe on ivt code
Not safe to insert kprobes on IVT code. This patch checks to see if the address on which Kprobes is being inserted is in ivt code and if it is in ivt code then refuse to register kprobe. Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Acked-by: David Mosberger <davidm@napali.hpl.hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ia64/kernel/kprobes.c')
-rw-r--r--arch/ia64/kernel/kprobes.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index ec2cead..3aa3167 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -34,6 +34,7 @@
#include <asm/pgtable.h>
#include <asm/kdebug.h>
+#include <asm/sections.h>
extern void jprobe_inst_return(void);
@@ -263,14 +264,27 @@ static inline void get_kprobe_inst(bundle_t *bundle, uint slot,
}
}
+/* Returns non-zero if the addr is in the Interrupt Vector Table */
+static inline int in_ivt_functions(unsigned long addr)
+{
+ return (addr >= (unsigned long)__start_ivt_text
+ && addr < (unsigned long)__end_ivt_text);
+}
+
static int valid_kprobe_addr(int template, int slot, unsigned long addr)
{
if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) {
- printk(KERN_WARNING "Attempting to insert unaligned kprobe at 0x%lx\n",
- addr);
+ printk(KERN_WARNING "Attempting to insert unaligned kprobe "
+ "at 0x%lx\n", addr);
return -EINVAL;
}
+ if (in_ivt_functions(addr)) {
+ printk(KERN_WARNING "Kprobes can't be inserted inside "
+ "IVT functions at 0x%lx\n", addr);
+ return -EINVAL;
+ }
+
if (slot == 1 && bundle_encoding[template][1] != L) {
printk(KERN_WARNING "Inserting kprobes on slot #1 "
"is not supported\n");
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