diff options
| author | Anton Arapov <anton@redhat.com> | 2013-04-03 18:00:31 +0200 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2013-04-13 15:31:53 +0200 |
| commit | ea024870cf10687b3fded66a9deb6253888f30b7 (patch) | |
| tree | 6071017ca5e987d991b42ceae519d92476ed3b36 | |
| parent | 3f47107c5c2972ca47f216889080f6ef818b25e3 (diff) | |
uretprobes: Introduce uprobe_consumer->ret_handler()
Enclose return probes implementation, introduce ->ret_handler() and update
existing code to rely on ->handler() *and* ->ret_handler() for uprobe and
uretprobe respectively.
Signed-off-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
| -rw-r--r-- | include/linux/uprobes.h | 3 | ||||
| -rw-r--r-- | kernel/events/uprobes.c | 17 |
2 files changed, 17 insertions, 3 deletions
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index 19612881399..5c8d3290df4 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -46,6 +46,9 @@ enum uprobe_filter_ctx { struct uprobe_consumer { int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs); + int (*ret_handler)(struct uprobe_consumer *self, + unsigned long func, + struct pt_regs *regs); bool (*filter)(struct uprobe_consumer *self, enum uprobe_filter_ctx ctx, struct mm_struct *mm); diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 7312503caf2..eb384e90ac9 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -838,6 +838,14 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer * struct uprobe *uprobe; int ret; + /* Uprobe must have at least one set consumer */ + if (!uc->handler && !uc->ret_handler) + return -EINVAL; + + /* TODO: Implement return probes */ + if (uc->ret_handler) + return -ENOSYS; + /* Racy, just to catch the obvious mistakes */ if (offset > i_size_read(inode)) return -EINVAL; @@ -1497,10 +1505,13 @@ static void handler_chain(struct uprobe *uprobe, struct pt_regs *regs) down_read(&uprobe->register_rwsem); for (uc = uprobe->consumers; uc; uc = uc->next) { - int rc = uc->handler(uc, regs); + int rc = 0; - WARN(rc & ~UPROBE_HANDLER_MASK, - "bad rc=0x%x from %pf()\n", rc, uc->handler); + if (uc->handler) { + rc = uc->handler(uc, regs); + WARN(rc & ~UPROBE_HANDLER_MASK, + "bad rc=0x%x from %pf()\n", rc, uc->handler); + } remove &= rc; } |