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[Programming] Thread: Fixed last bug in 5 month thread

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Posts

  • LD50LD50 Registered User regular
    bowen wrote: »
    CamelCase-->IsGreat();

  • Jimmy KingJimmy King Registered User regular
    MNC Dover wrote: »
    Working on the next lesson in the Udacity Intro to CS class. Two things I noticed that were weird;

    1) We are learning functions but the instructor calls them procedures. My wife explained that at her job, procedures are usually for doing something without returning value while functions do something and return value(s). Is that common for you guys?

    2) The instructor has all the variable and functions names spelled out with underscores. Like, first_number instead of the camel case firstNumber. Which do you prefer? I'm used to camel case and the wife agrees that it's usually better.

    Anyway, back to your high level programming shit.

    What language does your wife mostly work with at work? The only language I've ever dealt with which made the distinction was VB, although VB used subroutine as opposed to procedure.

    As #2, what the instructor is doing is the Python standard.
    ClassNames
    variable_names
    STATIC_VARIABLE_NAMES

    On occasion you'll run into libs which break from that, but that is usually done to mirror a pre-existing API in another language, particularly if it's just a Python wrapper around that API.

    Gethan_alt
  • KambingKambing Registered User regular
    edited March 2015
    You'll see function, subroutine, procedure, and method all used to describe the same:
    def foo():
        # Do stuff...
    

    construct. They are roughly interchangeable with function, subroutine, and procedure usually meaning "stand-alone function with or without side-effects and with or without a return value". Method is usually reserved for a function tied to an object (in the object-oriented sense), i.e., a function declared within a class and invoked on a particular object. It is usually assumed that a function has side-effects---printing, opening files, etc.. When a function does not have side-effects, then the function is called pure.

    That being said, all four terms are used interchangeably in practice, irrespective of the language, without much care to these nuances as they can usually be inferred from context.

    Kambing on
    @TwitchTV, @Youtube: master-level zerg ladder/customs, commentary, and random miscellany.
    Ethea
  • EtheaEthea Registered User regular
    Kambing wrote: »
    You'll see function, subroutine, procedure, and method all used to describe the same:
    def foo():
        # Do stuff...
    

    construct. They are roughly interchangeable with function, subroutine, and procedure usually meaning "stand-alone function with or without side-effects and with or without a return value". Method is usually reserved for a function tied to an object (in the object-oriented sense), i.e., a function declared within a class and invoked on a particular object. It is usually assumed that a function has side-effects---printing, opening files, etc.. When a function does not have side-effects, then the function is called pure.

    That being said, all four terms are used interchangeably in practice, irrespective of the language, without much care to these nuances as they can usually be inferred from context.

    I have co-workers who use the terms functions and free-functions, to refer to methods and functions. That was an interesting miscommunication.

    Kambing
  • KambingKambing Registered User regular
    edited March 2015
    Not to be confused with Free Functors!

    Kambing on
    @TwitchTV, @Youtube: master-level zerg ladder/customs, commentary, and random miscellany.
  • urahonkyurahonky Registered User regular
    urahonky wrote: »
    urahonky wrote: »
    Oh dip, congrats Dyas! My wife is about a week away from popping. I'm pretty terrified at this point in my life but it'll all work out... I hope.

    Hang on a sec

    Didn't we already have a Honky 2.0 a few years ago?

    Is this... Honky 3.0?!?!

    Yep. My daughter is almost 2 now and my son is -1 week old!

    Oh man

    You're in your final sprint!

    Have you figured out your user stories yet??!

    I figure I'll figure it out as they come up and then open tickets then.

    The first epic though is "Keep him fed." That should be sufficient.

    ecco the dolphin
  • LD50LD50 Registered User regular
    Kambing wrote: »
    You'll see function, subroutine, procedure, and method all used to describe the same:
    def foo():
        # Do stuff...
    

    construct. They are roughly interchangeable with function, subroutine, and procedure usually meaning "stand-alone function with or without side-effects and with or without a return value". Method is usually reserved for a function tied to an object (in the object-oriented sense), i.e., a function declared within a class and invoked on a particular object. It is usually assumed that a function has side-effects---printing, opening files, etc.. When a function does not have side-effects, then the function is called pure.

    That being said, all four terms are used interchangeably in practice, irrespective of the language, without much care to these nuances as they can usually be inferred from context.

    Languages will use different 'names' for specific language structures too, so inside of a language the term they use can matter. Functions vs methods in Python, or procs and methods in Ruby.

  • PhyphorPhyphor Building Planet Busters Tasting FruitRegistered User regular
    Whoops, it turns out nothing is safe. RUN FOR THE HILLS

    Magic Box
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  • SpawnbrokerSpawnbroker Registered User regular
    Passed my last test today, I am now officially a MCSA for Office 365 and an MCSE for SharePoint! Whew!

    Okay that's it, no more certification tests for me, I'm done thanks.

    Battle.net: Spawnbroker#1471
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    ecco the dolphincrimsoncoyotebowenironsizideurahonky
  • ecco the dolphinecco the dolphin Registered User regular
    Phyphor wrote: »

    Time to fall back to lower density DDR!

    Or... just not let remote code execute on our custom platform... =P

    Penny Arcade Developers at PADev.net.
  • PhyphorPhyphor Building Planet Busters Tasting FruitRegistered User regular
    Well, it's more hope they don't figure out how to do it with regular accesses in JS

    Magic Box
    Academician Prokhor "Phyphor" Zakharov, Chief Scientist of China, Provost of the University of Planet - SE++ Megagame
  • InfidelInfidel Heretic Registered User regular
    Phyphor wrote: »
    Well, it's more hope they don't figure out how to do it with regular accesses in JS

    You'd have to be running machine code to bypass caching, higher-level languages mostly wouldn't provide any means to exploit rowhammering.

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    ecco the dolphin
  • ecco the dolphinecco the dolphin Registered User regular
    Infidel wrote: »
    Phyphor wrote: »
    Well, it's more hope they don't figure out how to do it with regular accesses in JS

    You'd have to be running machine code to bypass caching, higher-level languages mostly wouldn't provide any means to exploit rowhammering.

    Alternatively, it's a server - spend a bit* more and use ECC ram, as the error correction will pick that up, as mentioned in the article.

    * in some cases, quite a bit =P

    Penny Arcade Developers at PADev.net.
  • PhyphorPhyphor Building Planet Busters Tasting FruitRegistered User regular
    edited March 2015
    Infidel wrote: »
    Phyphor wrote: »
    Well, it's more hope they don't figure out how to do it with regular accesses in JS

    You'd have to be running machine code to bypass caching, higher-level languages mostly wouldn't provide any means to exploit rowhammering.

    Not necessarily, it depends on the frequency of access required to trigger the bug. clflush is a very efficient way of clearing the cache, but
    for(int i = 0; i < cache_size / cache_line_size; i++) x = array[i * cache_line_size];
    
    will also (possibly) do it. To be safe you do it maybe across 2-3x the cache size to make the chance of clearing it higher. It does make it much harder to do though, and you can't do the mmap tricks they did to turn it into a exploit easily

    Phyphor on
    Magic Box
    Academician Prokhor "Phyphor" Zakharov, Chief Scientist of China, Provost of the University of Planet - SE++ Megagame
  • InfidelInfidel Heretic Registered User regular
    Phyphor wrote: »
    Infidel wrote: »
    Phyphor wrote: »
    Well, it's more hope they don't figure out how to do it with regular accesses in JS

    You'd have to be running machine code to bypass caching, higher-level languages mostly wouldn't provide any means to exploit rowhammering.

    Not necessarily, it depends on the frequency of access required to trigger the bug. clflush is a very efficient way of clearing the cache, but
    for(int i = 0; i < cache_size / cache_line_size; i++) x = array[i * cache_line_size];
    
    will also (possibly) do it. To be safe you do it maybe across 2-3x the cache size to make the chance of clearing it higher. It does make it much harder to do though, and you can't do the mmap tricks they did to turn it into a exploit easily

    Yeah, I don't think you'll have luck translating that into a working version. To blow the cache you're basically dispersing the effect, and you're totally relying on the physical electrical effect of hammering two specific rows to exploit this.

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  • TofystedethTofystedeth veni, veneri, vamoosi Registered User regular
    Phyphor wrote: »
    article wrote:
    Having finished spraying, it’s hammer time.

    steam_sig.png
    ecco the dolphin
  • PhyphorPhyphor Building Planet Busters Tasting FruitRegistered User regular
    edited March 2015
    Infidel wrote: »
    Phyphor wrote: »
    Infidel wrote: »
    Phyphor wrote: »
    Well, it's more hope they don't figure out how to do it with regular accesses in JS

    You'd have to be running machine code to bypass caching, higher-level languages mostly wouldn't provide any means to exploit rowhammering.

    Not necessarily, it depends on the frequency of access required to trigger the bug. clflush is a very efficient way of clearing the cache, but
    for(int i = 0; i < cache_size / cache_line_size; i++) x = array[i * cache_line_size];
    
    will also (possibly) do it. To be safe you do it maybe across 2-3x the cache size to make the chance of clearing it higher. It does make it much harder to do though, and you can't do the mmap tricks they did to turn it into a exploit easily

    Yeah, I don't think you'll have luck translating that into a working version. To blow the cache you're basically dispersing the effect, and you're totally relying on the physical electrical effect of hammering two specific rows to exploit this.

    True, but a single page all maps to the same row, or more than a page depending on layout, so it's not as dispersed (though you would need a cleverer access pattern of course)

    Phyphor on
    Magic Box
    Academician Prokhor "Phyphor" Zakharov, Chief Scientist of China, Provost of the University of Planet - SE++ Megagame
  • GnomeTankGnomeTank Registered User regular
    Generally a consider a "procedure" something that doesn't return data, while a 'function' is something that does...but that's purely arbitrary, and learned definitions over years of working in shops where that was the nomenclature. In reality, procedure, function, sub-routine, method and sometimes even delegate, can be used interchangeably and most developers will understand.

    Sagroth wrote: »
    Oh c'mon FyreWulff, no one's gonna pay to visit Uranus.
    Steam: Brainling, XBL / PSN: GnomeTank, NintendoID: Brainling, FF14: Zillius Rosh SFV: Brainling
  • DaedalusDaedalus Registered User regular
    Phyphor wrote: »

    Well, time to give up on security software. What should I try at next? I'm thinking luddism.

  • DehumanizedDehumanized Registered User regular
    Daedalus wrote: »
    Phyphor wrote: »

    Well, time to give up on security software. What should I try at next? I'm thinking luddism.

    Time to become a therapist and help security software developers through this very trying time

  • DaedalusDaedalus Registered User regular
    Hardware-wise, the solution seems pretty simple, actually: everybody needs to start using ECC memory, everywhere.

    Given the ever-increasing density of DRAM, we were bound to get here eventually, but I'm surprised that it's a security problem that hit first and not a reliability problem. Like, this isn't the sort of vulnerability that a software person thinks about.

  • ecco the dolphinecco the dolphin Registered User regular
    Now I'm vaguely curious

    Can I do row hammer with my FPGA?

    It's directly hooked up to the DDR3 memory, with a rudimentary DDR3 controller.

    Effectively, I have raw access to which rows/columns are actually forwarded to the DDR3 chip itself.

    Hilarity!

    Penny Arcade Developers at PADev.net.
    Daedalus
  • InfidelInfidel Heretic Registered User regular
    Flip gates, hack arrays.

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    ecco the dolphin
  • InfidelInfidel Heretic Registered User regular
    Hold onto your serial ports.

    OrokosPA.png
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  • KakodaimonosKakodaimonos Registered User regular
    All these fancy hacking techniques are nice but the ol' "get the sysadmin drunk at the strip club" works pretty well too.

    a5ehrenecco the dolphin
  • InfidelInfidel Heretic Registered User regular
    Yeah.

    Everyone look around your office and client space!

    Now tell me about any threats that concern you more than social engineering.

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    Polaritie
  • bowenbowen How you doin'? Registered User regular
    They let vendors and visitors in the back door here without signing them in.

    HIPAA violations all over the fucking place.

    I should just make a note of when and where I notice a violation and who I told about it and their response.

    Ladies.
  • crimsoncoyotecrimsoncoyote Registered User regular
    All these fancy hacking techniques are nice but the ol' "get the sysadmin drunk at the strip club" works pretty well too.

    Certainly sounds like the most fun option

  • gavindelgavindel The reason all your software is brokenRegistered User regular
    Social engineering works because the adversary is likely to be the most polite person to talk to that sysadmin all day.

    "Hey, this is James down in accounting. I know you're busy and I really respect the work you guys do for us, but could you help me out? My account got locked out."

    Meanwhile:
    "Dammit, my laptop won't turn on! Fix this now!"


    LD50
  • MNC DoverMNC Dover Game Designer/Stay-at-home Dad Seattle, WARegistered User regular
    I spent over an hour trying to figure out a while loop for finding factorials. I was way overthinking the problem by adding 2-3 unnecessary variables. Found the answer in the forum and wanted to kick myself.

    I'm not that dumb am I? :)

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  • TofystedethTofystedeth veni, veneri, vamoosi Registered User regular
    MNC Dover wrote: »
    I spent over an hour trying to figure out <thing>. I was way overthinking the problem by adding <stuff>. Found the answer in the forum and wanted to kick myself.

    Welcome to programming! We're glad you're here.

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    CreamstoutInfidelIzzimachcrimsoncoyoteMNC Doverecco the dolphinMvrckjjae2123ASimPersonelectricitylikesmePolaritiean_alt
  • urahonkyurahonky Registered User regular
    Hey guys I need some Python help. I have an image that is base64 encoded and sent to me as a string via JSON.

    Here's the code I used to generate the string:
    import base64
    with open("C:\\dev\\thumbs-up.jpg", "rb") as image_file:
        encoded_string = base64.b64encode(image_file.read())
    

    I then took the string and sent it to my API using Postman (which is an awesome tool, btw). And I cannot for the life of me take that encoded string and create a new image file. Here's what I have right now:
    diagram_data = json.loads(request.body.decode('utf-8')).get('diagram_data')
    image_binary = base64.b64decode(diagram_data)
    file = open("C:\\dev\\test.jpg", "w")
    file.write(diagram_data)
    file.close()
    

    I can't seem to figure out how to send the data to the write method.

    When I do:
    file.write(image_binary.decode('base64'))
    

    It doesn't make any sense since I've already decoded it using the base64.b64decode() up above. But I can't just put the image_binary because it says that it must be a string and not binary. But if I re-encode it back to the string I have the original string that was sent in, but the original string does not create the file.

  • urahonkyurahonky Registered User regular
    Wait, is it because I'm using base64.b64encode(file) instead of doing encodestring()? Is encodestring still base64?

  • djmitchelladjmitchella Registered User regular
    also, you may want to do file.open("filename", "wb") to make sure it doesn't do any sort of newline translation.

  • urahonkyurahonky Registered User regular
    I should just go ahead and forward my paycheck to you @djmitchella, seriously. So 'wb' means write bytes?

  • a5ehrena5ehren AtlantaRegistered User regular
    urahonky wrote: »
    I should just go ahead and forward my paycheck to you @djmitchella, seriously. So 'wb' means write bytes?

    "wb" = "write-only" + "binary mode"
    On Windows, 'b' appended to the mode opens the file in binary mode, so there are also modes like 'rb', 'wb', and 'r+b'. Python on Windows makes a distinction between text and binary files; the end-of-line characters in text files are automatically altered slightly when data is read or written. This behind-the-scenes modification to file data is fine for ASCII text files, but it’ll corrupt binary data like that in JPEG or EXE files. Be very careful to use binary mode when reading and writing such files. On Unix, it doesn’t hurt to append a 'b' to the mode, so you can use it platform-independently for all binary files.

    Very similar to C, just with a few options missing.

    urahonkydjmitchella
  • InfidelInfidel Heretic Registered User regular
    MNC Dover wrote: »
    I spent over an hour trying to figure out a while loop for finding factorials. I was way overthinking the problem by adding 2-3 unnecessary variables. Found the answer in the forum and wanted to kick myself.

    I'm not that dumb am I? :)

    This is the only way that makes it so you can feel like a fucking boss when you just nail a problem.

    Outsiders don't understand why we get so excited about elegance.

    It is because a lot of the time we are just slogging through problems.

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  • CreamstoutCreamstout What you think I program for, to push a fuckin' quad-core? Registered User regular
    I have an interview lined up tomorrow as a jr-mid level .Net developer wish me luck!...If anyone has interview questions I may come across please share.

    bowenurahonkyecco the dolphingavindel
  • MNC DoverMNC Dover Game Designer/Stay-at-home Dad Seattle, WARegistered User regular
    Creamstout wrote: »
    I have an interview lined up tomorrow as a jr-mid level .Net developer wish me luck!...If anyone has interview questions I may come across please share.

    Is it at Microsoft? Because the wife mentioned having to do an interview. Wouldn't that be funny.

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  • TofystedethTofystedeth veni, veneri, vamoosi Registered User regular
    Infidel wrote: »
    MNC Dover wrote: »
    I spent over an hour trying to figure out a while loop for finding factorials. I was way overthinking the problem by adding 2-3 unnecessary variables. Found the answer in the forum and wanted to kick myself.

    I'm not that dumb am I? :)

    This is the only way that makes it so you can feel like a fucking boss when you just nail a problem.

    Outsiders don't understand why we get so excited about elegance.

    It is because a lot of the time we are just slogging through problems.

    New thread means new opportunity to post these.
    http://threepanelsoul.com/2013/04/15/on-infinite-loops/
    http://threepanelsoul.com/2013/12/16/on-perl/

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This discussion has been closed.