linux-kernel - [PATCH 5/5] uprobes: kill insert_vm_struct()->uprobe

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Message-ID: <20120708203011.GA18243@redhat.com>
Date:	Sun, 8 Jul 2012 22:30:11 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] uprobes: kill insert_vm_struct()->uprobe_mmap()

Kill insert_vm_struct()->uprobe_mmap(). It is not needed, nobody
except arch/ia64/kernel/perfmon.c uses insert_vm_struct(vma) with
vma->vm_file != NULL.

And it is wrong. Again, get_user_pages() can not succeed before
vma_link(vma) makes is visible to find_vma(). And even if this
worked, we must not insert the new bp before this mapping is
visible to vma_prio_tree_foreach() for uprobe_unregister().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 mm/mmap.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index e5a4614..4fe2697 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2345,9 +2345,6 @@ int insert_vm_struct(struct mm_struct * mm, struct vm_area_struct * vma)
 	     security_vm_enough_memory_mm(mm, vma_pages(vma)))
 		return -ENOMEM;
 
-	if (vma->vm_file && uprobe_mmap(vma))
-		return -EINVAL;
-
 	vma_link(mm, vma, prev, rb_link, rb_parent);
 	return 0;
 }
-- 
1.5.5.1

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