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kprobes: kretprobe user entry-handler

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Provide support to add an optional user defined callback to be run at
function entry of a kretprobe'd function.  Also modify the kprobe smoke
tests to include an entry-handler during the kretprobe sanity test.

Signed-off-by: Abhishek Sagar <[email protected]>
Cc: Prasanna S Panchamukhi <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Anil S Keshavamurthy <[email protected]>
Acked-by: Jim Keniston <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Abhishek Sagar 2008-02-06 01:38:22 -08:00 • committed by Linus Torvalds
commit f47cd9b553
4 changed files with 94 additions and 15 deletions
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9
kernel/kprobes.c
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@ -699,6 +699,12 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
struct kretprobe_instance, uflist);
ri->rp = rp;
ri->task = current;
if (rp->entry_handler && rp->entry_handler(ri, regs)) {
spin_unlock_irqrestore(&kretprobe_lock, flags);
return 0;
}
arch_prepare_kretprobe(ri, regs);
/* XXX(hch): why is there no hlist_move_head? */
@ -745,7 +751,8 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
INIT_HLIST_HEAD(&rp->used_instances);
INIT_HLIST_HEAD(&rp->free_instances);
for (i = 0; i < rp->maxactive; i++) {
inst = kmalloc(sizeof(struct kretprobe_instance), GFP_KERNEL);
inst = kmalloc(sizeof(struct kretprobe_instance) +
rp->data_size, GFP_KERNEL);
if (inst == NULL) {
free_rp_inst(rp);
return -ENOMEM;