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[94.245.46.49]) by smtp.gmail.com with ESMTPSA id e20sm5602045ljn.107.2020.04.03.11.18.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Apr 2020 11:18:26 -0700 (PDT) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Fri, 3 Apr 2020 20:18:18 +0200 To: Peter Zijlstra Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, jroedel@suse.de, vbabka@suse.cz, urezki@gmail.com, Thomas Gleixner Subject: Re: [PATCH] mm/vmalloc: Sanitize __get_vm_area() arguments Message-ID: <20200403181818.GA5538@pc636> References: <20200403163253.GU20730@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200403163253.GU20730@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Apr 03, 2020 at 06:32:53PM +0200, Peter Zijlstra wrote: > > __get_vm_area() is an exported symbol, make sure the callers stay in > the expected memory range. When calling this function with memory > ranges outside of the VMALLOC range *bad* things can happen. > > (I noticed this when I managed to corrupt the kernel text by accident) > > Signed-off-by: Peter Zijlstra (Intel) > --- > mm/vmalloc.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -2130,6 +2130,13 @@ static struct vm_struct *__get_vm_area_n > struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, > unsigned long start, unsigned long end) > { > + /* > + * Ensure callers stay in the vmalloc range. > + */ > + if (WARN_ON(start < VMALLOC_START || start > VMALLOC_END || > + end < VMALLOC_START || end > VMALLOC_END)) > + return NULL; > + > return __get_vm_area_node(size, 1, flags, start, end, NUMA_NO_NODE, > GFP_KERNEL, __builtin_return_address(0)); > } Peter, could you please clarify what kind of issues you had and how you tested? __get_vm_area() is not limited by allocating only with vmalloc space, it can use whole virtual address space/range, i.e. 1 - ULONG_MAX. Though, i am not sure if there are users(who uses __get_vm_area()) which allocate outside of vmalloc address space. -- Vlad Rezki