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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. SwiftOnSecurity‏ @SwiftOnSecurity Feb 13

      SwiftOnSecurity Retweeted @dietrich@mastodon.social

      Antivirus is always a good place to start on troubleshooting inexplicable delayshttps://twitter.com/dietrich/status/963470291824357376 …

      SwiftOnSecurity added,

      @dietrich@mastodon.social @dietrich
      Firefox: 100ms Firefox + Kaspersky: 14s https://bugzilla.mozilla.org/show_bug.cgi?id=1348361#c52 …
      13 replies 31 retweets 119 likes
    2. Rich Felker‏ @RichFelker Feb 13
      Replying to @SwiftOnSecurity

      See my favorite example:https://stackoverflow.com/questions/5924707/fwrite-chokes-on-xml-version/5924782#5924782 …

      1 reply 5 retweets 27 likes
    3. Vess‏ @VessOnSecurity Feb 14
      Replying to @RichFelker @SwiftOnSecurity

      This answer is another bunch of nonsense by someone who has no clue how AV works and why it does what it does. All the suggestions given in it are rubbish. There are very good reasons why AV programs don't do that.

      1 reply 1 retweet 3 likes
    4. Rich Felker‏ @RichFelker Feb 15
      Replying to @VessOnSecurity @SwiftOnSecurity

      I'll take that as a compliment I guess, but others might appreciate hearing your reasons.

      1 reply 0 retweets 0 likes
    5. Vess‏ @VessOnSecurity Feb 15
      Replying to @RichFelker @SwiftOnSecurity

      Sigh... It wasn't a compliment, as I'm sure you know perfectly well. Somebody did try to explain in the comments why at least some of it is nonsense, but you didn't listen. OK, let's look at the suggestions one by one.

      1 reply 1 retweet 3 likes
    6. Vess‏ @VessOnSecurity Feb 15
      Replying to @VessOnSecurity @RichFelker @SwiftOnSecurity

      Advice #1: Scan only on transition between writing and reading. Well, sometimes a long time passes between these, you know. User unpacks a malicious archive and forgets about it. A month later he remembers and clicks on something - boom.

      3 replies 1 retweet 5 likes
    7. Vess‏ @VessOnSecurity Feb 15
      Replying to @VessOnSecurity @RichFelker @SwiftOnSecurity

      So, the scanner would have to keep some kind of journal of transactions - sometimes for months, because you can never be sure. How much space is that going to take? How much time to process it?

      2 replies 0 retweets 2 likes
      Rich Felker‏ @RichFelker Feb 15
      Replying to @VessOnSecurity @SwiftOnSecurity

      It's constant space per-file. Just a generation counter for latest definitions the file was checked against, reset to zero on any write to the file. Read where counter != latest triggers scan.

      1:14 PM - 15 Feb 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Vess‏ @VessOnSecurity Feb 15
          Replying to @RichFelker @SwiftOnSecurity

          The average system nowadays has tens of thousands - often hundreds of thousands of scannable files. (It's one of the reason why practically no user does "full disk scan" these days, unless infection is suspected, BTW - takes too damn long.)

          1 reply 0 retweets 0 likes
        3. Vess‏ @VessOnSecurity Feb 15
          Replying to @VessOnSecurity @RichFelker @SwiftOnSecurity

          Even the smallest file takes considerably more disk space than its length in bytes. If you keep the info in separate files, or in streams, you're going to waste a lot of disk space and you're going to have users screaming what these files/streams are.

          1 reply 0 retweets 0 likes
        4. Vess‏ @VessOnSecurity Feb 15
          Replying to @VessOnSecurity @RichFelker @SwiftOnSecurity

          InVircible used this approach (for integrity data) in the 90s. It's been essentially dead as a product for many years. (Thank goodness; it was crap.) As I said, whatever you can come up with - we've tried it before and it didn't work.

          1 reply 0 retweets 0 likes
        5. Vess‏ @VessOnSecurity Feb 15
          Replying to @VessOnSecurity @RichFelker @SwiftOnSecurity

          And if you put the data in a single database, you'd also have overhead managing the database and even just reading from it. And most of the time it will be for naught, because it won't save you a scan.

          0 replies 0 retweets 0 likes
        6. End of conversation

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