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authorOleg Nesterov <oleg@redhat.com>2012-12-28 17:58:38 +0100
committerOleg Nesterov <oleg@redhat.com>2013-02-08 17:47:10 +0100
commit8a7f2fa0dea3b019500961b86d765e6fdd4bffb2 (patch)
treec6c467e02da75a9e92f8541cf8889dbd0e2fe5fb /include/linux/uprobes.h
parent806a98bdf2a862fef0fc880399d677b35ba525ff (diff)
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>
Diffstat (limited to 'include/linux/uprobes.h')
-rw-r--r--include/linux/uprobes.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 83742b91ff73..c2df6934fdc6 100644
--- 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;
};