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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. Miguel Duarte  🇵🇹 🇪🇺‏ @malduarte Jun 11

      Miguel Duarte  🇵🇹 🇪🇺 Retweeted Miguel Duarte  🇵🇹 🇪🇺

      I've ported the original Java 10 codebase to @rustlang in roughly 6 days (tdd'ing all the way) and used https://github.com/emk/rust-musl-builder … to cross compile a static binary that doesn't depend on the host libc (which was too old to use)https://twitter.com/malduarte/status/1006308696211718145 …

      Miguel Duarte  🇵🇹 🇪🇺 added,

      Miguel Duarte  🇵🇹 🇪🇺 @malduarte
      Replying to @edevil @rustlang
      Actually the motivation was on an actual consulting project, to migrate data from a "ancient" locked down prod legacy system (the best Java they have is 1.4.2!) with equally ancient shared libraries. The feasible only way forward would be to use a statically linked binary
      3 replies 14 retweets 76 likes
      Show this thread
    2. Arvid E. Picciani‏ @arvidep Jun 12
      Replying to @malduarte @rustlang

      Note that this still depends on the host Libc as LD loader.

      1 reply 0 retweets 0 likes
    3. Miguel Duarte  🇵🇹 🇪🇺‏ @malduarte Jun 12
      Replying to @arvidep @rustlang

      What do you mean? The generated binary is as static as it gets. ldd returns "not a dynamic executable" and both hosts are X86-64. But maybe I've misunderstood your comment :)

      1 reply 0 retweets 0 likes
    4. Arvid E. Picciani‏ @arvidep Jun 12
      Replying to @malduarte @rustlang

      "no dependencies" is a fallacy. you have either 1. no Address space layout randomization (ELf Type EXEC) and no plugin support 2. a dependency on libc at runtime (objdump -s -j .interp yourexe) 3. a self relocating DYN (which rust-musl-builder doesnt activate)

      2 replies 0 retweets 0 likes
    5. Miguel Duarte  🇵🇹 🇪🇺‏ @malduarte Jun 12
      Replying to @arvidep @rustlang

      Anyway, correct me if I'm wrong. if I statically link all dependencies (i.e. no shared libraries at all - which is the case as proven by ldd and objdump) I won't need the host libc for anything. That's what I originally meant and required. And worked just fine.

      1 reply 0 retweets 0 likes
    6. Arvid E. Picciani‏ @arvidep Jun 12
      Replying to @malduarte @rustlang

      No. You still need the same libc you linked against at runtime for DYN relocation. Using musl static linked bins with glibc at runtime is not supported (although it works mostly)

      1 reply 0 retweets 0 likes
    7. davmac‏ @davmac314 Jun 13
      Replying to @arvidep @malduarte

      I just statically linked a program, not huge but not trivial, and "objdump -s -j .interp" says "objdump: section '.interp' mentioned in a -j option, but not found in any input file". I don't understand why a statically linked executable would contain DYN relocations?

      2 replies 0 retweets 0 likes
    8. Arvid E. Picciani‏ @arvidep Jun 13
      Replying to @davmac314 @malduarte

      Then it's a position dependant EXEC (check the elf header) which does not have ASLR or plugin loading and can't link to code compiled -fPIC (the default)

      3 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jun 22
      Replying to @arvidep @davmac314 @malduarte

      I think you have this backwards. "Can't link to code compiled with -fPIC" can't happen. PIC can link with anything. Non-PIC can't be used in PIE or shared libs.

      9:05 PM - 22 Jun 2018
      1 reply 0 retweets 0 likes
        1. Arvid E. Picciani‏ @arvidep Jun 23
          Replying to @RichFelker @davmac314 @malduarte

          Pretty sure I saw gnu ld explode trying to mix non PIC rust code with PIC openssl and non PIC gnulibc, but I maybe I'm remembering wrong.

          0 replies 0 retweets 0 likes
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