[PATCH] kretprobe: kretprobe-booster

In normal operation, kretprobe makes a target function return to trampoline
code.  A kprobe (called trampoline_probe) has been inserted in the trampoline
code.  When the kernel hits this kprobe, it calls kretprobe's handler and it
returns to the original return address.

Kretprobe-booster removes the trampoline_probe.  It allows the trampoline code
to call kretprobe's handler directly instead of invoking kprobe.  The
trampoline code returns to the original return address.

(changelog from Chuck Ebbert <76306.1226@compuserve.com> - thanks ;))

Signed-off-by: Masami Hiramatsu <hiramatu@sdl.hitachi.co.jp>
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 39 insertions, 22 deletions

diff --git a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c
index 137bf612141b..acdcc640a72a 100644
--- a/arch/i386/kernel/kprobes.c
+++ b/arch/i386/kernel/kprobes.c
@@ -333,17 +333,44 @@ no_kprobe:
  * here. When a retprobed function returns, this probe is hit and
  * trampoline_probe_handler() runs, calling the kretprobe's handler.
  */
- void kretprobe_trampoline_holder(void)
+ void __kprobes kretprobe_trampoline_holder(void)
  {
-        asm volatile (  ".global kretprobe_trampoline\n"
+        asm volatile ( ".global kretprobe_trampoline\n"
                         "kretprobe_trampoline: \n"
-                        "nop\n");
- }
+                        "       pushf\n"
+                        /* skip cs, eip, orig_eax, es, ds */
+                        "       subl $20, %esp\n"
+                        "       pushl %eax\n"
+                        "       pushl %ebp\n"
+                        "       pushl %edi\n"
+                        "       pushl %esi\n"
+                        "       pushl %edx\n"
+                        "       pushl %ecx\n"
+                        "       pushl %ebx\n"
+                        "       movl %esp, %eax\n"
+                        "       call trampoline_handler\n"
+                        /* move eflags to cs */
+                        "       movl 48(%esp), %edx\n"
+                        "       movl %edx, 44(%esp)\n"
+                        /* save true return address on eflags */
+                        "       movl %eax, 48(%esp)\n"
+                        "       popl %ebx\n"
+                        "       popl %ecx\n"
+                        "       popl %edx\n"
+                        "       popl %esi\n"
+                        "       popl %edi\n"
+                        "       popl %ebp\n"
+                        "       popl %eax\n"
+                        /* skip eip, orig_eax, es, ds */
+                        "       addl $16, %esp\n"
+                        "       popf\n"
+                        "       ret\n");
+}
 
 /*
- * Called when we hit the probe point at kretprobe_trampoline
+ * Called from kretprobe_trampoline
  */
-int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
+fastcall void *__kprobes trampoline_handler(struct pt_regs *regs)
 {
         struct kretprobe_instance *ri = NULL;
         struct hlist_head *head;
@@ -372,8 +399,11 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
                         /* another task is sharing our hash bucket */
                         continue;
 
-                if (ri->rp && ri->rp->handler)
+                if (ri->rp && ri->rp->handler){
+                        __get_cpu_var(current_kprobe) = &ri->rp->kp;
                         ri->rp->handler(ri, regs);
+                        __get_cpu_var(current_kprobe) = NULL;
+                }
 
                 orig_ret_address = (unsigned long)ri->ret_addr;
                 recycle_rp_inst(ri);
@@ -388,18 +418,10 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
         }
 
         BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
-        regs->eip = orig_ret_address;
 
-        reset_current_kprobe();
         spin_unlock_irqrestore(&kretprobe_lock, flags);
-        preempt_enable_no_resched();
 
-        /*
-         * By returning a non-zero value, we are telling
-         * kprobe_handler() that we don't want the post_handler
-         * to run (and have re-enabled preemption)
-         */
-        return 1;
+        return (void*)orig_ret_address;
 }
 
 /*
@@ -646,12 +668,7 @@ int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
         return 0;
 }
 
-static struct kprobe trampoline_p = {
-        .addr = (kprobe_opcode_t *) &kretprobe_trampoline,
-        .pre_handler = trampoline_probe_handler
-};
-
 int __init arch_init_kprobes(void)
 {
-        return register_kprobe(&trampoline_p);
+        return 0;
 }