uprobes: Reintroduce uprobe_consumer->filter()

Finally add uprobe_consumer->filter() and change consumer_filter()
to actually call this method.

Note that ->filter() accepts mm_struct, not task_struct. Because:

	1. We do not have for_each_mm_user(mm, task).

	2. Even if we implement for_each_mm_user(), ->filter() can
	   use it itself.

	3. It is not clear who will actually need this interface to
	   do the "nontrivial" filtering.

Another argument is "enum uprobe_filter_ctx", consumer->filter() can
use it to figure out why/where it was called. For example, perhaps
we can add UPROBE_FILTER_PRE_REGISTER used by build_map_info() to
quickly "nack" the unwanted mm's. In this case consumer should know
that it is called under ->i_mmap_mutex.

See the previous discussion at http://marc.info/?t=135214229700002
Perhaps we should pass more arguments, vma/vaddr?

Note: this patch obviously can't help to filter out the child created
by fork(), this will be addressed later.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 83742b9..c2df693 100644 (file)
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -35,8 +35,17 @@ struct inode;
 # include <asm/uprobes.h>
 #endif
 
+enum uprobe_filter_ctx {
+       UPROBE_FILTER_REGISTER,
+       UPROBE_FILTER_UNREGISTER,
+       UPROBE_FILTER_MMAP,
+};
+
 struct uprobe_consumer {
        int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
+       bool (*filter)(struct uprobe_consumer *self,
+                               enum uprobe_filter_ctx ctx,
+                               struct mm_struct *mm);
 
        struct uprobe_consumer *next;
 };

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 3391208..c2737be 100644 (file)
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -579,19 +579,21 @@ static int prepare_uprobe(struct uprobe *uprobe, struct file *file,
        return ret;
 }
 
-static inline bool consumer_filter(struct uprobe_consumer *uc)
+static inline bool consumer_filter(struct uprobe_consumer *uc,
+                                  enum uprobe_filter_ctx ctx, struct mm_struct *mm)
 {
-       return true; /* TODO: !uc->filter || uc->filter(...) */
+       return !uc->filter || uc->filter(uc, ctx, mm);
 }
 
-static bool filter_chain(struct uprobe *uprobe)
+static bool filter_chain(struct uprobe *uprobe,
+                        enum uprobe_filter_ctx ctx, struct mm_struct *mm)
 {
        struct uprobe_consumer *uc;
        bool ret = false;
 
        down_read(&uprobe->consumer_rwsem);
        for (uc = uprobe->consumers; uc; uc = uc->next) {
-               ret = consumer_filter(uc);
+               ret = consumer_filter(uc, ctx, mm);
                if (ret)
                        break;
        }
@@ -772,10 +774,12 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
 
                if (is_register) {
                        /* consult only the "caller", new consumer. */
-                       if (consumer_filter(uprobe->consumers))
+                       if (consumer_filter(uprobe->consumers,
+                                       UPROBE_FILTER_REGISTER, mm))
                                err = install_breakpoint(uprobe, mm, vma, info->vaddr);
                } else if (test_bit(MMF_HAS_UPROBES, &mm->flags)) {
-                       if (!filter_chain(uprobe))
+                       if (!filter_chain(uprobe,
+                                       UPROBE_FILTER_UNREGISTER, mm))
                                err |= remove_breakpoint(uprobe, mm, info->vaddr);
                }
 
@@ -968,7 +972,7 @@ int uprobe_mmap(struct vm_area_struct *vma)
         */
        list_for_each_entry_safe(uprobe, u, &tmp_list, pending_list) {
                if (!fatal_signal_pending(current) &&
-                   filter_chain(uprobe)) {
+                   filter_chain(uprobe, UPROBE_FILTER_MMAP, vma->vm_mm)) {
                        unsigned long vaddr = offset_to_vaddr(vma, uprobe->offset);
                        install_breakpoint(uprobe, vma->vm_mm, vma, vaddr);
                }