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we own used the term abstraction and may expend a minute talking about what it means in regards to kernel design. when they consider the project of resource administration, they own to investigate the degree of wield they wish to implement in their management scheme. probably the most hints of the alternate comprises grouping particular person components of a gadget resource into uniform-sized blocks, chunks, extents, pages, etc. the provision of the resource is then tracked at the degree of these granular instruments, as a result reducing the complexity of kernel statistics structures.
A basic case is that of reminiscence management. a laptop's physical RAM incorporates circuits representing solitary bits of records storage; these are mixed into units of eight and called bytes. An operating gadget combines bytes into phrases (for HP-UX, a word is 32 bits, or 4bytes; here is real for both narrow and vast kernels). The note is soundless a extremely minute quantity of storage space, and if the kernel essential to maneuver every notice (with the aid of control, they hint retain song of which words are presently getting used, which can be free, and who is the usage of what), the volume of remembrance crucial to build such constructions may easily require as a lot house as or more than the reminiscence being managed!
To crop back this administration overhead, they execute the managed unit measurement larger than a notice. In UNIX, here's completed by combining sequential physical phrases of remembrance into gadgets called page frames (on HP-UX the page body is 4096 bytes, or 1024 phrases). Now the project of holding song of what's free and what is in consume turns into a total lot easier. here is a really simple layer of abstraction; the kernel manages page frames, which you and i know are in fact blocks of phrases made of bytes that are 8-bits each.
a latest UNIX kernel may consume multiple layers of abstraction. Let's proceed with their dialogue of simple reminiscence administration. UNIX kernels regularly execute consume of a scheme whereby a technique that requires a couple of page frames to hold its code is assigned an accurately sized location in a digital web page-frame map. digital web page frames are mapped to certain actual web page frames by means of processor hardware and helping kernel tables (discussed later during this book). This extra layer of abstraction drastically simplifies considerations akin to allowing two or more approaches to partake the selfsame view of executable code, shared libraries, shared reminiscence, and other manner-level shared objects.
There are constructions within the kernel to preserve tune of every point at every abstraction layer. Entities at better layers effectively aspect to the tracking buildings on the reduce layers. lessen degree aid attributes are inherited by means of the upper abstraction layers.
Care should be taken in determining the measurement of every administration unit—too vast and you may dissipate a restrained aid; too minute and the overhead of the monitoring structures may be excessive. The kernel clothier invariably walks a trait line between solace and efficiency. As you scrutinize at aid administration, word the granularity of control the kernel has over its charges.
Ang Cui has lots of vigour. With enough time he can pick manage of fairly much any networked gadget. He may watch you through your iSight or music the Netflix on your sapient television. but he has larger fish to fry, so your Catfish marathons are protected for now. From him, as a minimum.
A Columbia PhD pupil in computer science, Cui has been working for the final 5 years on developing loathsome assaults and defensive options for vulnerabilities in embedded instruments. This Thursday his enterprise, purple Balloon safety—cofounded by means of Cui's sheperd Sal Stolfo—will current proof that its safety software, the "symbiote," can protect a typical IP office cellphone from malicious attacks. And this IP mobilephone demo is barely the starting.
finally, the symbiote could protect pretty much any linked gadget that you can feel of.
"definitely [IP phones] are just computer systems too, and they're working these tremendous covert proprietary operating methods that very few people own truly seen, and extremely few individuals own really validated the protection of," Cui instructed us in a simultaneous interview. "and too you know, the labor that now they own been doing in the lab is to betray that those things are just as insecure because the usual goal computer systems you have, and once you pick handicap of these issues there are actually advantages to that over just getting root access to a server somewhere, which is what every person in safety mostly has been focused on for the ultimate always."
The symbiote is a tiny piece of code, about 200 bytes, this is injected into an IP mobilephone's kernel (the aspect that bridges functions and hardware-stage data processing) without impacting computing pace or device performance. And the symbiote is working-system agnostic, that means it may hasten on and monitor any rig devoid of being tailor-made to a selected OS. When it's injected, the symbiote makes consume of Cui's firmware contrast tool, Firmware reverse evaluation Konsole (FRAK) to unpack the device's firmware, change its signing key (a primary safety feature) and repack. Then it runs within the history, and randomly samples finished code at regular intervals to ensure that nothing bizarre is occurring.
with out knowing certain specifics about an OS, the symbiote can soundless set up a baseline for ordinary habits in a appliance the usage of functions which are shared amongst several types of firmware and may fairly be expected to be current. In Cui's demonstration, two IP phones sit down side by side. One is working the symbiote and the different is never. When Cui launches an attack, the unguarded mobile is easily exploited, but the symbiote on the other phone detects the intrusion and indicators Cui through calling his cellular telephone. When he answers, an automated message says, "hey neighbor. My IP cell has been pon3d."
The goal of pink Balloon security is to present the symbiote as a protection admit for totality embedded devices. If an IP phone can be hacked, so can some other cyber web-enabled equipment, however since the symbiote is OS agnostic it will possibly readily translate to any machine—even a rice cooker—and be included seamlessly. diverse symbiotes operating on the equal network might even computer screen each and every different as an extra manner of checking for extraordinary pastime on any one device.Does the world really want a Smartphone-managed Rice Cooker?
the zone might too now not, however according to Panasonic, Japan definitely does. The company's fresh SR-SX2…examine more examine
Cui and Stolfo own increasingly gained frequent consciousness for his or her analysis, a constitution of labor that consists of intensely creepy however nonetheless badass hacks. In 2011 they confirmed a flaw in HP printer firmware that was the excellent entryway for an assault. If a hacker could win somebody to print a malware-tainted document, enjoy a resume, from any centered HP printer, she may pick over the entire aspect and coach the printer to transmit her copies of whatever it turned into printing, or supply her with access to the community server.
almost immediately after Cui exposed the vulnerability, HP launched a patch. "We create 201 HP laser jet printers within the DOD's community that own been susceptible to my storm enjoy 5 months after the patch turned into out. They create two in HP [headquarters]" just through publicly accessible IP addresses.
For his next hack in 2012, Cui discovered the IP mobile vulnerability in Cisco workplace telephones that the symbiote now secures. He demonstrates the storm on a standard-problem Columbia university cell sitting on his desk, though he emphasizes that Cisco is not the handiest enterprise producing vulnerable gadgets. "On the cell, there's simply no indication that the repose ordinary is happening. And it just always forwards the entire statistics to my laptop where i will be able to list the sound or finish something. it's simply a laptop Put into a plastic shell that appears enjoy a cell."
After Cui presented the IP cellphone hack at a conference in December, Cisco went the route of HP and launched a patch for their internet phones on January 17. After their patch led to telephones to crash, they launched a revision on February 14 to "disable the endemic console port" or reduce the telephones off from the internet, which is enjoy fixing a hangnail by means of amputating your hand..
Cui hopes that after he and Stolfo existing the symbiote, although, businesses will initiate to undertake it as an alternative to what Stolfo calls "the patch and pray components." "The smarter producers will win it that having this expertise interior their machines reduces their complications dramatically," Stolfo says.
"The traditional manner for safety is you be sensible every shrimp thing the system is hypothetical to finish and too you really practice a template of what it'll do, and what it shouldn't," Cui says. "but this view that you should cozy a device with out figuring out the route it works, that is anything it really is a departure from common operating manner and the route of pondering security… With the symbiote the customer can finish it, the dealer can finish it and neither has to scrutinize forward to the other."
The weaknesses Cui has identified to date own offered transparent examples of security risks. When he assessed publicly attainable records about which executive businesses used at-possibility Cisco phones, Cui create areas of instant problem. "We discovered videoconference contraptions in district lawyer's workplaces in a number of states. definitely sensitive places of work. And if you own an embedded machine enjoy a videoconference unit you own eyes and ears. This is never just an IP handle."
during his five years at Columbia, Cui has arrive to pick into account that his research may own major implications for the espionage and intelligence communities. "How finish you be certain you win cyber conflict?" he asks casually. "Some guy available does not simply say, ‘k boys, hack ‘em, and provides ‘em hell,' and then you start hacking. What you finish is you recon. You preposition your items, and when the change is flipped you either win it or lose it before the combat even starts... If the defender gets there first it's terrific and you win always, but if the attacker receives there first you lose continually."
from time to time, for a second, Cui's constant assuredness will crumple to contemplation in regards to the magnitude of the topics he researches and the domain he has entered. "here's some of the issues that I totality the time felt extraordinary about, because loads of times i might see anything enjoy this, and it be four o'clock in the morning, and it be murky in my house, and that i look to be round and it's either i am insane or i'm incorrect or enjoy the world is actually atypical someway as a result of I can't might be be the primary grownup to own completed this," he says.
issues about embedded machine security own percolated quietly for years, however the situation is finally spreading in a extra meaningful method. The subsequent step for crimson Balloon safety is discovering a huge-scale network environment during which to hasten a pilot of the symbiote. "This actually is the realm's most comfy IP cell," Cui says. "we will pick this and Put it into creation in a huge environment. i might volunteer to execute consume of this cell, but no one calls me at work." He turns and facets to the exploited workplace cell. "Dude, you understand that thing has been recording this total time, correct?"
graphic by using Shutterstock
The findings arrive from a recent client survey performed to evaluate client satisfaction. consumers determined UC4's top strengths as product performance, multi-platform assist and the company's committed focus on job scheduling options.
"The survey proven that they are heading in the privilege direction in looking ahead to what their consumers want," talked about label Loehr, COO of UC4 software. "providing an event-pushed job scheduling solution is not sufficient. They proceed to carry a top trait solution with multi-platform capabilities and commercial enterprise-wide performance."
UC4's job scheduling solution, UC4:international, has a different platform-unbiased architecture that gives expanded protection whereas protecting the supply and usability of the data. With UC4:global, facts centers can automate IT methods on greater than 30 different applications and operating techniques.
"We failed to want to be mainframe centric with their platform option. They necessary a job scheduler that could fulfill in a multi-platform atmosphere," observed Bob McKey, techniques analyst, Shands Healthcare. "UC4:world has changed their mainframe job scheduler and they assume that it can be in a position to tackle their integrated go-platform job scheduling needs for home windows, AIX, and the mainframe."
The survey additionally concluded that purchasers chose UC4:global on account of its prosperous product aspects and inordinate concepts from different clients.
About UC4 software
UC4 software is the exceptional chief in industry job scheduling. based in 1985, the industry is identified as one of the crucial job scheduling industry's suitable carriers. more than 750 organizations international, together with many Fortune 500 agencies, own installed its flagship product, UC4:global. valued clientele encompass Mattel, Air items, Cadbury Schweppes, Columbia school, T-techniques, Robert Bosch and the Mayo foundation. The industry has offices in Europe, the united states and Australia, and is supported by route of a network of partners in more than 30 countries everywhere. For more suggestions, talk over with www.UC4.com.
UC4:world is a world-leading technology admit for adventure-pushed job scheduling, providing centralized manage and monitoring of IT approaches across totality systems and structures totality through the commercial enterprise. UC4:international supports finished technique management for enterprise solutions similar to SAP, PeopleSoft, Oracle, and Siebel, in addition to totality working techniques, including windows, Linux, UNIX, OpenVMS, HP NonStop Kernel, OS/400, MPE/ix, z/OS, BS2000/OSD and GCOS 8.
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We live in a world where there are more ways than ever to communicate. These numerous methods enhance a company’s capacity to engage with customers and staff, but they too present unique challenges, especially for those of us in great organizations.
How finish you demolish through totality the noise? How finish you execute certain policies and guidance are properly understood? Clear, consistent communication is key.
Here are three simple ways to execute certain your message gets through.
1. recall the rule of seven.
It’s one of the oldest marketing principles out there -- a person should be exposed to your message seven times to ensure it’s remembered and understood. Many apply this rule to product marketing, but I believe this applies to internal communications as well.
One of the most basic mistakes someone can execute is thinking, “I’ve sent it, so they must own read it.” Odds are, if you’ve only sent a communication once, it will be forgotten within hours. For your message to stick, it should be Put out there at least seven times, and not just as an email. consider reinforcing your message via a post on Facebook, at a staff meeting, during workshops and maybe even on physical signage hung up on the walls.
Whenever they own information to communicate at ERA, they consume many different channels. They present web-based learning opportunities for their employees, so they’re sensible and own the capacity to query their own questions. They create and circulate FAQs, so staff members are prepared to admit questions from affiliates. It’s not just one and done. With multiple and varied forms of communications, the message has a better chance of sticking. Importantly, everyone has the break to understand and query the questions they exigency in order to provide the best flat of service.
2. Use each mode of communication for its intended purpose.
Otherwise, your communications may occasions more harm than good. A worthy specimen of this is the consume of instant messaging in corporate settings.
Most companies own some kindly of internal chat platform set up, be it Slack, Yammer, Flock, Fleep, etc. These are worthy because they allow for quick questions, crowdsourcing, casual brainstorm sessions and a zone for information sharing without adding to your massive pile of emails.
The downside of these platforms, however, is that their ease and hasten can result in nonstop usage, which ironically adds to the massive pile of communications to sort through. It’s harder to flag famous messages (as opposed to email), and it can be a huge time-waster when you own to dig through dozens of messages in your email inbox only to realize that the famous conversation you were looking for actually took zone in a chat.
The casualness and hasten of the chat landscape can too diminish the integrity of industry interaction. People own a inclination to handle corporate chats the selfsame route they handle texting their best friend. While they shouldn’t dishearten the playful, fun interactions, it is famous to recall that these are soundless professional communications channels.
Not every communication has to be through email, but if there’s real industry that is being communicated back and forth, it shouldn’t be in a chat app.
3. handle your topic lines as headlines.
When reading the news, how often finish you just skim the headlines instead of reading the plenary article? They finish this because we’re industrious but want to see what’s going on in the world. Maybe if there’s a really compelling headline, we’ll click and read more.
This is too how many people deal with their emails, which is why I’ve adopted a fresh approach. It’s extremely simple: I now insert specific deadlines into my topic lines. I’m not talking things enjoy “Please Read”; I be substantive things enjoy “Respond by Friday” or “Your Input Needed by Tuesday.” That way, even if the person doesn’t own time to read my plenary email privilege away, they at least own a sense of the timeline for which they exigency to respond.
The bottom line is, we’re totality extremely industrious and inundated with messages. Consistent and smart communications are vital to ensuring that employees and customers understand your brand, culture, values and offerings and own totality the information they exigency to act.
Learn how to migrate and modernize stateless applications and hasten them in a Kubernetes cluster.
As mentioned in a prior post, Kubernetes is at its best when managing single-process containers. Nevertheless, Kubernetes aims to allow fresh and legacy workloads to pick handicap of multiple cooperating processes with pods. Containers can be single-process, which is where pods arrive in. Kubernetes is not designed for single-process cloud-native applications, and in order to allow legacy applications to be ported, the authors of Kubernetes created a logical unit that maps very closely to traditional cloud deployments of multi-process applications.
A pod is a set of containers that are deployed on the selfsame node, win a shared IP, inside the selfsame kernel security group, and can consume traditional interprocess communication techniques. Containers within a pod partake the selfsame lifecycle, and are managed by Kubernetes as a unit.
There is a lot to cover when it comes to pod design, and rather than try to cover everything in a solitary post, we’ll cover the basics, and then provide links to more detailed discussions where workable with succeed up posts on subjects that they own not yet create trait detailed resources.
In this post, we’ll cover pod scheduling and how to maintain the trait of service by properly specifying resource limitations.Pod Scheduling: Priority and trait of Service
Kubernetes uses several pieces of information in scheduling and evicting workloads on the cluster. Failure to set these parameters properly can result in performance problems, workload downtimes, and significant overall cluster health issues.
Resource Requests and Limits are the most obvious of these settings, but there are subtle implications to these settings which are not always understood up front.
All four of the touchstone service types (Deployments, StatefuSets, Jobs, and DaemonSets) accept a request and a limit for thee different types of compute resources: cpu, memory, and ephemeral-storage. Additionally, Kubernetes allows for a pod priority domain to be set.Lifecycle of a Pod
At a very elevated level, the scheduler controller maintains a queue of pods to be deployed for the cluster and then for each workload in the queue looks for a node with enough available compute resources to fulfill the "request" for that pod and assigns the pod to that node. Limits are ignored during scheduling.
Once a pod is scheduled to a node, the kublet on that node picks up the change, and installs and starts the pod.
In Kubernetes versions < 1.8, pod priority is ignored by the scheduler; in 1.11, the above Story is modified so that pods are scheduled in priority order. In 1.8-1.10 this feature was in alpha and had to be explicitly enabled in the Kubernetes config.Resource Limitations and Pod Priority
However, this Story is complicated by the fact that since pods are allowed to own limits higher than their request, resource starvation is possible.
When a node hits its limit for remembrance or disk pods can be evicted and sent back to the scheduler for redeployment on another node. CPU, on the other hand, will be throttled back by the Linux kernel when limits are met.
(from: How to consume resource requests and limits to manage resource usage of your Kubernetes cluster )Quality of Service Classes and What They Mean
In order to manage this process, Kubernetes defines three different trait of Service Classes which allow you to control which pods will be evicted in case of resource starvation.
a. specific requests and limits for CPU and memory
b. Limits that exactly match the memory/CPU requests for that container.
a. specific requests and limits for CPU and memory
b. Limits that are greater than the requested amount for at least one container in the pod
Pods are evicted only if they are using more resources than the user-defined request. This means guaranteed pods will never be evicted, burstable pods will only be evicted if they are using more of the starved resource than allowed, and best ail pods can be preempted at any time.
Best Practices for Resource Requests and Limitations
There are a few famous implications of this:
In this post they discussed how defining requests and limits are famous for your deployments. They followed up with an explanation of the different trait of Service classes that too exigency configuration when running production workloads.
Start from the birth in this series:
Part 1: Best Practices for Designing and edifice Containers for Kubernetes
Part 2: Managing Secrets in Kubernetes
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It has been a shrimp over 48 hours since the Intel kernel bug was first reported and while they don’t own an official comment from Intel yet, it looks enjoy there are some additional details of what the actual problem is. Those in the know are allegedly under embargo but courtesy of AMD’s statement on what ‘isn’t’ wrong with their x86 processors, they own a fairly expedient view of what the bug entails. The repercussions of this could own austere consequences for Intel’s standing as a company and as a supplier of x86 microprocessors – particularly in the enterprise ecosystem.AMD spills the beans: Hardware flat speculative execution to weakness for the Intel Kernel bug; cannot be patched using a microcode update and will require OS flat KPTI to patch
Before they win into any other details, a background on the problem. The bug was discovered at a hardware flat and pertains to an exploit that is capable of granting kernel flat access to malicious parties. Since this exists at the hardware level, a patch via microcode is apparently not possible. The only known workaround is via the OS, which would require an OS re-design which Windows is working on and Linux has already rolled out.
Word on the street is that Microsoft is scrambling to win this patched arrive Tuesday and the changes were already seeded to beta testers running insider builds. Here’s the catch though, any patch could interject a crucial time penalty to the system which basically means that in some instances the CPUs could drastically slack down. They own seen numbers quoted of up to 30%, but the conservative estimates point to a roughly 17% slowdown. So what exactly is the problem?
Well, before they win into that, here is the statement from AMD, which basically spilled the beans on what the issue is:
AMD processors are not topic to the types of attacks that the kernel page table isolation feature protects against. The AMD microarchitecture does not allow remembrance references, including speculative references, that access higher privileged data when running in a lesser privileged mode when that access would result in a page fault.
Since Intel has been very tight lipped about this issue, they can deduce fairly easily from this statement that the problem has to finish with speculative references in Intel’s processors, which AMD CPUs don’t have. Speculative execution is basically a figure of pre-emption which tries to call what code is going to be run, and then fetch it and execute it before the actual order comes through and keeping pipelines ready. The point of this is to own the kernel absolutely ready for any command, instead of letting it wait around.
The problem, as it is transparent from AMD’s comments, is that you can exploit this feature to speculatively execute code that would normally be blocked as long as you cease the actual code from running before a check can be performed. What this essentially means is that a ring-3-level user can read ring-0-level kernel data by using speculative execution since the privilege check won’t actually be performed till the code is executed on the main.
The kernel layer is currently present in totality processes’ virtual remembrance address space to ensure a expeditiously handover during code execution but is completely invisible to totality programs. The kernel will basically try to call what code will be executed next and when a program makes a system call to the kernel, it will already be ready and primed for the handover. This can significantly enlarge execution times but as it is transparent now, too represents a very troublesome security flaw since no privilege check is present at the kernel stage.
The only route to win around this hardware flat feature is to consume what is called a Kernel Page Table Isolation (KPTI) technique which will execute the kernel completely blind to the system and remove it from the virtual remembrance space until a system call occurs. Basically, where it was an invisible stage hand hidden just behind the curtain, now it won’t be on the stage at totality until it’s called. Needless to say, this could interject austere time penalties in context-switching hefty situations where a lot of system calls are required. The Linux team too mulled over FUCKWIT (Forcefully Unmap Complete Kernel with Interrupt Trampolines) which should give you an view of how frustrating the bug is for developers.
According to some sources, this number can ambit anywhere from 5% to 30% depending on which sort of processor you own since modern CPUs own a feature called PCID which can reduce the performance hit. According to an existing KPTI workaround posted at Postgresql, you should expect a 17% best case slowdown and a worst case 23% slowdown. In any case, totality sources conform that a slowdown will almost definitely occur and this is not something Intel can simply patch with a microcode update. AMD processors at this time are unaffected since they finish not utilize speculative execution.
So the obvious next question becomes who will this repercussion and how will this repercussion cessation users. Well, the expedient advice is, if you are reading this article you are probably a gamer or a PC tech enthusiast and you will see almost no contrast once the patch is applied (gaming and basic rendering are not context-switching hefty payloads). Enterprise clients enjoy Google EC2 and Amazon Compute Engine however, will be drastically affected since they consume VMs which this can severely compromise. Secondly, as a universal user, your passwords and other sensitive information may be stored in the kernel remembrance and this bug could be used to access that information (Update: Working proof of concept of password being pulled from kernel mem leak over here).
Windows is expected to roll out a patch arrive Tuesday and Apple should too succeed up soon. totality that remains is an official response from the company itself.Update: First benchmarks with KPTI labor around from Phoronix showing performance degradation (1% to 53% depending on consume case), gaming not affected
The folks over at Phoronix did some preliminary synthetic testing and were able to solemnize performance degradation that ranges from 19% to a massive 53% depending on the exact situation and benchmark tested. Scenarios that should point to no consequence are showing less than a 1% deviation from the initial benchmark. They expect other publications to finish their own benchmarks as well once Intel responds.Update: Intel’s official response
Intel has rolled out their official response on this and assured that the bug won’t influence the tolerable user (as they own already stated) and that they are actively working with other companies to resolve this:
Intel and other technology companies own been made sensible of fresh security research describing software analysis methods that, when used for malicious purposes, own the potential to improperly assemble sensitive data from computing devices that are operating as designed. Intel believes these exploits finish not own the potential to corrupt, modify or delete data.
Recent reports that these exploits are caused by a “bug” or a “flaw” and are unique to Intel products are incorrect. Based on the analysis to date, many types of computing devices — with many different vendors’ processors and operating systems — are susceptible to these exploits.
Intel is committed to product and customer security and is working closely with many other technology companies, including AMD, ARM Holdings and several operating system vendors, to develop an industry-wide approach to resolve this issue promptly and constructively. Intel has begun providing software and firmware updates to mitigate these exploits. balky to some reports, any performance impacts are workload-dependent, and, for the tolerable computer user, should not be significant and will be mitigated over time.
Intel is committed to the industry best practice of responsible disclosure of potential security issues, which is why Intel and other vendors had planned to disclose this issue next week when more software and firmware updates will be available. However, Intel is making this statement today because of the current inaccurate media reports.
Check with your operating system vendor or system manufacturer and apply any available updates as soon as they are available. Following expedient security practices that protect against malware in universal will too uphold protect against workable exploitation until updates can be applied.
Intel believes its products are the most secure in the world and that, with the uphold of its partners, the current solutions to this issue provide the best workable security for its customers.
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