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authorMasami Hiramatsu <mhiramat@redhat.com>2010-03-09 10:22:19 -0500
committerIngo Molnar <mingo@elte.hu>2010-03-11 14:06:16 +0100
commit83ff56f46a8532488ee364bb93a9cb2a59490d33 (patch)
treeeacccd619d004b2578bc14e6049eb7c03aac8bb0
parenta12b51c478899fe0b7e874a559b05ba35f1128ee (diff)
downloadop-kernel-dev-83ff56f46a8532488ee364bb93a9cb2a59490d33.zip
op-kernel-dev-83ff56f46a8532488ee364bb93a9cb2a59490d33.tar.gz
kprobes: Calculate the index correctly when freeing the out-of-line execution slot
From : Ananth N Mavinakayanahalli <ananth@in.ibm.com> When freeing the instruction slot, the arithmetic to calculate the index of the slot in the page needs to account for the total size of the instruction on the various architectures. Calculate the index correctly when freeing the out-of-line execution slot. Reported-by: Sachin Sant <sachinp@in.ibm.com> Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> LKML-Reference: <4B9667AB.9050507@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/kprobes.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index fa034d2..0ed46f3 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -259,7 +259,8 @@ static void __kprobes __free_insn_slot(struct kprobe_insn_cache *c,
struct kprobe_insn_page *kip;
list_for_each_entry(kip, &c->pages, list) {
- long idx = ((long)slot - (long)kip->insns) / c->insn_size;
+ long idx = ((long)slot - (long)kip->insns) /
+ (c->insn_size * sizeof(kprobe_opcode_t));
if (idx >= 0 && idx < slots_per_page(c)) {
WARN_ON(kip->slot_used[idx] != SLOT_USED);
if (dirty) {
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