[PATCH] kprobes: increment kprobe missed count for multiprobes

When multiple probes are registered at the same address and if due to some
recursion (probe getting triggered within a probe handler), we skip calling
pre_handlers and just increment nmissed field.

The below patch make sure it walks the list for multiple probes case.
Without the below patch we get incorrect results of nmissed count for
multiple probe case.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 5 insertions, 5 deletions

diff --git a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c
index 32b0c24ab9a6..19edcd526ba4 100644
--- a/arch/i386/kernel/kprobes.c
+++ b/arch/i386/kernel/kprobes.c
@@ -191,7 +191,7 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
                          */
                         save_previous_kprobe(kcb);
                         set_current_kprobe(p, regs, kcb);
-                        p->nmissed++;
+                        kprobes_inc_nmissed_count(p);
                         prepare_singlestep(p, regs);
                         kcb->kprobe_status = KPROBE_REENTER;
                         return 1;
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 2895d6e6062f..89a70400c4f6 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -630,7 +630,7 @@ static int __kprobes pre_kprobes_handler(struct die_args *args)
                          */
                         save_previous_kprobe(kcb);
                         set_current_kprobe(p, kcb);
-                        p->nmissed++;
+                        kprobes_inc_nmissed_count(p);
                         prepare_ss(p, regs);
                         kcb->kprobe_status = KPROBE_REENTER;
                         return 1;
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 511af54e6230..5368f9c2e6bf 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -177,7 +177,7 @@ static inline int kprobe_handler(struct pt_regs *regs)
                         save_previous_kprobe(kcb);
                         set_current_kprobe(p, regs, kcb);
                         kcb->kprobe_saved_msr = regs->msr;
-                        p->nmissed++;
+                        kprobes_inc_nmissed_count(p);
                         prepare_singlestep(p, regs);
                         kcb->kprobe_status = KPROBE_REENTER;
                         return 1;
diff --git a/arch/sparc64/kernel/kprobes.c b/arch/sparc64/kernel/kprobes.c
index 96bd09b098f4..a97b0f0727ab 100644
--- a/arch/sparc64/kernel/kprobes.c
+++ b/arch/sparc64/kernel/kprobes.c
@@ -138,7 +138,7 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
                          */
                         save_previous_kprobe(kcb);
                         set_current_kprobe(p, regs, kcb);
-                        p->nmissed++;
+                        kprobes_inc_nmissed_count(p);
                         kcb->kprobe_status = KPROBE_REENTER;
                         prepare_singlestep(p, regs, kcb);
                         return 1;
diff --git a/arch/x86_64/kernel/kprobes.c b/arch/x86_64/kernel/kprobes.c
index dddeb678b440..afe11f4fbd1d 100644
--- a/arch/x86_64/kernel/kprobes.c
+++ b/arch/x86_64/kernel/kprobes.c
@@ -329,7 +329,7 @@ int __kprobes kprobe_handler(struct pt_regs *regs)
                                  */
                                 save_previous_kprobe(kcb);
                                 set_current_kprobe(p, regs, kcb);
-                                p->nmissed++;
+                                kprobes_inc_nmissed_count(p);
                                 prepare_singlestep(p, regs);
                                 kcb->kprobe_status = KPROBE_REENTER;
                                 return 1;