linux-kernel - [tip:perf/core] uprobes: Valid_vma() should reject VM

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Date:	Mon, 18 Jun 2012 01:50:03 -0700
From:	tip-bot for Oleg Nesterov <oleg@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, ananth@...ibm.com, anton@...hat.com,
	srikar@...ux.vnet.ibm.com, tglx@...utronix.de, oleg@...hat.com
Subject: [tip:perf/core] uprobes: Valid_vma() should reject VM_HUGETLB

Commit-ID:  ea131377148cdfe90641b42ae9aa5a6b3a4fa327
Gitweb:     http://git.kernel.org/tip/ea131377148cdfe90641b42ae9aa5a6b3a4fa327
Author:     Oleg Nesterov <oleg@...hat.com>
AuthorDate: Fri, 15 Jun 2012 17:43:22 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 16 Jun 2012 09:10:41 +0200

uprobes: Valid_vma() should reject VM_HUGETLB

__replace_page() obviously can't work with the hugetlbfs
mappings, uprobe_register() will likely crash the kernel. Change
valid_vma() to check VM_HUGETLB as well.

As for PageTransHuge() no need to worry, vma->vm_file != NULL.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Anton Arapov <anton@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20120615154322.GA9561@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/uprobes.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index b52376d..f0d0453 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -99,7 +99,8 @@ static bool valid_vma(struct vm_area_struct *vma, bool is_register)
 	if (!is_register)
 		return true;
 
-	if ((vma->vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)) == (VM_READ|VM_EXEC))
+	if ((vma->vm_flags & (VM_HUGETLB|VM_READ|VM_WRITE|VM_EXEC|VM_SHARED))
+				== (VM_READ|VM_EXEC))
 		return true;
 
 	return false;
--
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