diff options
| -rw-r--r-- | arch/i386/kernel/kprobes.c | 17 | ||||
| -rw-r--r-- | arch/ia64/kernel/kprobes.c | 18 | ||||
| -rw-r--r-- | arch/powerpc/kernel/kprobes.c | 19 | ||||
| -rw-r--r-- | arch/s390/kernel/kprobes.c | 18 | ||||
| -rw-r--r-- | arch/x86_64/kernel/kprobes.c | 17 | ||||
| -rw-r--r-- | include/linux/kprobes.h | 5 | ||||
| -rw-r--r-- | kernel/kprobes.c | 64 |
7 files changed, 44 insertions, 114 deletions
diff --git a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c index 3fbef288c37..b6a9d64c225 100644 --- a/arch/i386/kernel/kprobes.c +++ b/arch/i386/kernel/kprobes.c @@ -226,24 +226,15 @@ static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs) } /* Called with kretprobe_lock held */ -void __kprobes arch_prepare_kretprobe(struct kretprobe *rp, +void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { unsigned long *sara = (unsigned long *)®s->esp; - struct kretprobe_instance *ri; + ri->ret_addr = (kprobe_opcode_t *) *sara; - if ((ri = get_free_rp_inst(rp)) != NULL) { - ri->rp = rp; - ri->task = current; - ri->ret_addr = (kprobe_opcode_t *) *sara; - - /* Replace the return addr with trampoline addr */ - *sara = (unsigned long) &kretprobe_trampoline; - add_rp_inst(ri); - } else { - rp->nmissed++; - } + /* Replace the return addr with trampoline addr */ + *sara = (unsigned long) &kretprobe_trampoline; } /* diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index 353689edebd..0b72f0f9419 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -465,23 +465,13 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) } /* Called with kretprobe_lock held */ -void __kprobes arch_prepare_kretprobe(struct kretprobe *rp, +void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { - struct kretprobe_instance *ri; + ri->ret_addr = (kprobe_opcode_t *)regs->b0; - if ((ri = get_free_rp_inst(rp)) != NULL) { - ri->rp = rp; - ri->task = current; - ri->ret_addr = (kprobe_opcode_t *)regs->b0; - - /* Replace the return addr with trampoline addr */ - regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip; - - add_rp_inst(ri); - } else { - rp->nmissed++; - } + /* Replace the return addr with trampoline addr */ + regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip; } int __kprobes arch_prepare_kprobe(struct kprobe *p) diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index 3d54ad7dd1f..aed58e1cb91 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -126,22 +126,13 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs, } /* Called with kretprobe_lock held */ -void __kprobes arch_prepare_kretprobe(struct kretprobe *rp, +void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { - struct kretprobe_instance *ri; - - if ((ri = get_free_rp_inst(rp)) != NULL) { - ri->rp = rp; - ri->task = current; - ri->ret_addr = (kprobe_opcode_t *)regs->link; - - /* Replace the return addr with trampoline addr */ - regs->link = (unsigned long)kretprobe_trampoline; - add_rp_inst(ri); - } else { - rp->nmissed++; - } + ri->ret_addr = (kprobe_opcode_t *)regs->link; + + /* Replace the return addr with trampoline addr */ + regs->link = (unsigned long)kretprobe_trampoline; } static int __kprobes kprobe_handler(struct pt_regs *regs) diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c index 8516a94d816..9d0f0d09d47 100644 --- a/arch/s390/kernel/kprobes.c +++ b/arch/s390/kernel/kprobes.c @@ -271,23 +271,13 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs, } /* Called with kretprobe_lock held */ -void __kprobes arch_prepare_kretprobe(struct kretprobe *rp, +void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { - struct kretprobe_instance *ri; + ri->ret_addr = (kprobe_opcode_t *) regs->gprs[14]; - if ((ri = get_free_rp_inst(rp)) != NULL) { - ri->rp = rp; - ri->task = current; - ri->ret_addr = (kprobe_opcode_t *) regs->gprs[14]; - - /* Replace the return addr with trampoline addr */ - regs->gprs[14] = (unsigned long)&kretprobe_trampoline; - - add_rp_inst(ri); - } else { - rp->nmissed++; - } + /* Replace the return addr with trampoline addr */ + regs->gprs[14] = (unsigned long)&kretprobe_trampoline; } static int __kprobes kprobe_handler(struct pt_regs *regs) diff --git a/arch/x86_64/kernel/kprobes.c b/arch/x86_64/kernel/kprobes.c index 5841ba5f479..f995bea6e2c 100644 --- a/arch/x86_64/kernel/kprobes.c +++ b/arch/x86_64/kernel/kprobes.c @@ -266,23 +266,14 @@ static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs) } /* Called with kretprobe_lock held */ -void __kprobes arch_prepare_kretprobe(struct kretprobe *rp, +void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { unsigned long *sara = (unsigned long *)regs->rsp; - struct kretprobe_instance *ri; - if ((ri = get_free_rp_inst(rp)) != NULL) { - ri->rp = rp; - ri->task = current; - ri->ret_addr = (kprobe_opcode_t *) *sara; - - /* Replace the return addr with trampoline addr */ - *sara = (unsigned long) &kretprobe_trampoline; - add_rp_inst(ri); - } else { - rp->nmissed++; - } + ri->ret_addr = (kprobe_opcode_t *) *sara; + /* Replace the return addr with trampoline addr */ + *sara = (unsigned long) &kretprobe_trampoline; } int __kprobes kprobe_handler(struct pt_regs *regs) diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h index 850ee871e35..6fc623e41fd 100644 --- a/include/linux/kprobes.h +++ b/include/linux/kprobes.h @@ -123,7 +123,8 @@ DECLARE_PER_CPU(struct kprobe *, current_kprobe); DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); #ifdef ARCH_SUPPORTS_KRETPROBES -extern void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs); +extern void arch_prepare_kretprobe(struct kretprobe_instance *ri, + struct pt_regs *regs); #else /* ARCH_SUPPORTS_KRETPROBES */ static inline void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs) @@ -209,8 +210,6 @@ void jprobe_return(void); int register_kretprobe(struct kretprobe *rp); void unregister_kretprobe(struct kretprobe *rp); -struct kretprobe_instance *get_free_rp_inst(struct kretprobe *rp); -void add_rp_inst(struct kretprobe_instance *ri); void kprobe_flush_task(struct task_struct *tk); void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head); #else /* CONFIG_KPROBES */ diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 22857003a65..f58f171bd65 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -358,46 +358,6 @@ void __kprobes kprobes_inc_nmissed_count(struct kprobe *p) } /* Called with kretprobe_lock held */ -struct kretprobe_instance __kprobes *get_free_rp_inst(struct kretprobe *rp) -{ - struct hlist_node *node; - struct kretprobe_instance *ri; - hlist_for_each_entry(ri, node, &rp->free_instances, uflist) - return ri; - return NULL; -} - -/* Called with kretprobe_lock held */ -static struct kretprobe_instance __kprobes *get_used_rp_inst(struct kretprobe - *rp) -{ - struct hlist_node *node; - struct kretprobe_instance *ri; - hlist_for_each_entry(ri, node, &rp->used_instances, uflist) - return ri; - return NULL; -} - -/* Called with kretprobe_lock held */ -void __kprobes add_rp_inst(struct kretprobe_instance *ri) -{ - /* - * Remove rp inst off the free list - - * Add it back when probed function returns - */ - hlist_del(&ri->uflist); - - /* Add rp inst onto table */ - INIT_HLIST_NODE(&ri->hlist); - hlist_add_head(&ri->hlist, - &kretprobe_inst_table[hash_ptr(ri->task, KPROBE_HASH_BITS)]); - - /* Also add this rp inst to the used list. */ - INIT_HLIST_NODE(&ri->uflist); - hlist_add_head(&ri->uflist, &ri->rp->used_instances); -} - -/* Called with kretprobe_lock held */ void __kprobes recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head) { @@ -450,7 +410,9 @@ void __kprobes kprobe_flush_task(struct task_struct *tk) static inline void free_rp_inst(struct kretprobe *rp) { struct kretprobe_instance *ri; - while ((ri = get_free_rp_inst(rp)) != NULL) { + struct hlist_node *pos, *next; + + hlist_for_each_entry_safe(ri, pos, next, &rp->free_instances, uflist) { hlist_del(&ri->uflist); kfree(ri); } @@ -732,7 +694,21 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p, /*TODO: consider to only swap the RA after the last pre_handler fired */ spin_lock_irqsave(&kretprobe_lock, flags); - arch_prepare_kretprobe(rp, regs); + if (!hlist_empty(&rp->free_instances)) { + struct kretprobe_instance *ri; + + ri = hlist_entry(rp->free_instances.first, + struct kretprobe_instance, uflist); + ri->rp = rp; + ri->task = current; + arch_prepare_kretprobe(ri, regs); + + /* XXX(hch): why is there no hlist_move_head? */ + hlist_del(&ri->uflist); + hlist_add_head(&ri->uflist, &ri->rp->used_instances); + hlist_add_head(&ri->hlist, kretprobe_inst_table_head(ri->task)); + } else + rp->nmissed++; spin_unlock_irqrestore(&kretprobe_lock, flags); return 0; } @@ -795,11 +771,13 @@ void __kprobes unregister_kretprobe(struct kretprobe *rp) { unsigned long flags; struct kretprobe_instance *ri; + struct hlist_node *pos, *next; unregister_kprobe(&rp->kp); + /* No race here */ spin_lock_irqsave(&kretprobe_lock, flags); - while ((ri = get_used_rp_inst(rp)) != NULL) { + hlist_for_each_entry_safe(ri, pos, next, &rp->used_instances, uflist) { ri->rp = NULL; hlist_del(&ri->uflist); } |