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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. Rich Felker‏ @RichFelker 24 Jun 2017
      Replying to @revskills

      Spender's mindset is even worse though.

      1 reply 0 retweets 2 likes
    2. CopperheadOS‏ @CopperheadOS 24 Jun 2017
      Replying to @RichFelker @revskills

      KSTACKOVERFLOW started out with a similar approach and grsecurity users had to find and report the bugs until they changed it for compat...

      1 reply 0 retweets 2 likes
    3. CopperheadOS‏ @CopperheadOS 24 Jun 2017
      Replying to @CopperheadOS @RichFelker @revskills

      Not really surprising that upstream took the same kind of approach but as an enabled by default mainline feature it's a different situation.

      2 replies 0 retweets 1 like
    4. Rich Felker‏ @RichFelker 24 Jun 2017
      Replying to @CopperheadOS @revskills

      Kernel can't be the one responsible for protection against this because it doesn't control stack setup. (Only for initial thread.)

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 24 Jun 2017
      Replying to @RichFelker @CopperheadOS @revskills

      It's compiler's fault for not doing the same sort of stack probing they already do on windows targets.

      6:00 AM - 24 Jun 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Ed Maste‏ @ed_maste 24 Jun 2017
          Replying to @RichFelker @CopperheadOS @revskills

          I'm glad to see work starting to progress in Clang/LLVM again as a result

          1 reply 0 retweets 1 like
        3. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @ed_maste @RichFelker @revskills

          Note that it's once again a set of changes for Rust, which @whitequark and @pcwalton revived. Clang would need to wire up a switch to it.

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @CopperheadOS @ed_maste and

          Maybe -fstack-check (instead of it the very poor decision to make it a no-op...) or maybe a new switch breaking away from weird GCC choices.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @CopperheadOS @ed_maste and

          Clang/LLVM already had stack probes for Windows which are unconditionally enabled but not wired up in a way that it could be used elsewhere.

          1 reply 0 retweets 0 likes
        6. whitequark‏ @whitequark 24 Jun 2017
          Replying to @CopperheadOS @ed_maste and

          Apart from a -fstack-check implementation in clang this also needs compiler-rt code, that's trickier because of large support matrix

          1 reply 0 retweets 0 likes
        7. whitequark‏ @whitequark 24 Jun 2017
          Replying to @whitequark @CopperheadOS and

          I wouldn't be the one to write it, though feel free to tag me as a reviewer

          0 replies 0 retweets 2 likes
        8. End of conversation
        1. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @RichFelker @revskills

          It's about the issue within the kernel. It's true that compiler stack probes could work for the kernel as an option depending on VMAP_STACK.

          0 replies 0 retweets 1 like
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