kprobes: Don't check the ->break_handler() in generic kprobes code

Don't check the ->break_handler() from the core kprobes code,
because it was only used by jprobes which got removed.

( In followup patches we'll remove the remaining calls in low level
  arch handlers as well and remove the callback altogether. )

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-arch@vger.kernel.org
Link: https://lore.kernel.org/lkml/152942462686.15209.6324404940493598980.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt
index 33dd6a8..ab2c730 100644 (file)
--- a/Documentation/kprobes.txt
+++ b/Documentation/kprobes.txt
@@ -262,7 +262,7 @@ is optimized, that modification is ignored.  Thus, if you want to
 tweak the kernel's execution path, you need to suppress optimization,
 using one of the following techniques:
 
-- Specify an empty function for the kprobe's post_handler or break_handler.
+- Specify an empty function for the kprobe's post_handler.
 
 or
 

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 69de130..536ab45 100644 (file)
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -627,8 +627,8 @@ static void optimize_kprobe(struct kprobe *p)
            (kprobe_disabled(p) || kprobes_all_disarmed))
                return;
 
-       /* Both of break_handler and post_handler are not supported. */
-       if (p->break_handler || p->post_handler)
+       /* kprobes with post_handler can not be optimized */
+       if (p->post_handler)
                return;
 
        op = container_of(p, struct optimized_kprobe, kp);
@@ -1116,20 +1116,6 @@ static int aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
 }
 NOKPROBE_SYMBOL(aggr_fault_handler);
 
-static int aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
-{
-       struct kprobe *cur = __this_cpu_read(kprobe_instance);
-       int ret = 0;
-
-       if (cur && cur->break_handler) {
-               if (cur->break_handler(cur, regs))
-                       ret = 1;
-       }
-       reset_kprobe_instance();
-       return ret;
-}
-NOKPROBE_SYMBOL(aggr_break_handler);
-
 /* Walks the list and increments nmissed count for multiprobe case */
 void kprobes_inc_nmissed_count(struct kprobe *p)
 {
@@ -1270,24 +1256,15 @@ static void cleanup_rp_inst(struct kretprobe *rp)
 }
 NOKPROBE_SYMBOL(cleanup_rp_inst);
 
-/*
-* Add the new probe to ap->list. Fail if this is the
-* second break_handler at the address
-*/
+/* Add the new probe to ap->list */
 static int add_new_kprobe(struct kprobe *ap, struct kprobe *p)
 {
        BUG_ON(kprobe_gone(ap) || kprobe_gone(p));
 
-       if (p->break_handler || p->post_handler)
+       if (p->post_handler)
                unoptimize_kprobe(ap, true);    /* Fall back to normal kprobe */
 
-       if (p->break_handler) {
-               if (ap->break_handler)
-                       return -EEXIST;
-               list_add_tail_rcu(&p->list, &ap->list);
-               ap->break_handler = aggr_break_handler;
-       } else
-               list_add_rcu(&p->list, &ap->list);
+       list_add_rcu(&p->list, &ap->list);
        if (p->post_handler && !ap->post_handler)
                ap->post_handler = aggr_post_handler;
 
@@ -1310,8 +1287,6 @@ static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
        /* We don't care the kprobe which has gone. */
        if (p->post_handler && !kprobe_gone(p))
                ap->post_handler = aggr_post_handler;
-       if (p->break_handler && !kprobe_gone(p))
-               ap->break_handler = aggr_break_handler;
 
        INIT_LIST_HEAD(&ap->list);
        INIT_HLIST_NODE(&ap->hlist);
@@ -1706,8 +1681,6 @@ static int __unregister_kprobe_top(struct kprobe *p)
                goto disarmed;
        else {
                /* If disabling probe has special handlers, update aggrprobe */
-               if (p->break_handler && !kprobe_gone(p))
-                       ap->break_handler = NULL;
                if (p->post_handler && !kprobe_gone(p)) {
                        list_for_each_entry_rcu(list_p, &ap->list, list) {
                                if ((list_p != p) && (list_p->post_handler))
@@ -1911,7 +1884,6 @@ int register_kretprobe(struct kretprobe *rp)
        rp->kp.pre_handler = pre_handler_kretprobe;
        rp->kp.post_handler = NULL;
        rp->kp.fault_handler = NULL;
-       rp->kp.break_handler = NULL;
 
        /* Pre-allocate memory for max kretprobe instances */
        if (rp->maxactive <= 0) {
@@ -2034,7 +2006,6 @@ static void kill_kprobe(struct kprobe *p)
                list_for_each_entry_rcu(kp, &p->list, list)
                        kp->flags |= KPROBE_FLAG_GONE;
                p->post_handler = NULL;
-               p->break_handler = NULL;
                kill_optimized_kprobe(p);
        }
        /*