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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. whitequark‏ @whitequark Jan 10

      TIL you can get the path to the current executable with getauxval(AT_EXECFN) on Linux, no messing with /proc necessary. It's a separate block of memory filled by the kernel, not argv[0] or anything.

      10 replies 19 retweets 94 likes
    2. Rich Felker‏ @RichFelker Jan 10
      Replying to @whitequark

      As I understand it, AT_EXECFN is the exact string that was passed to SYS_execve, so it could be relative to . at the time of exec, could no longer be valid due to changes to fs, etc.

      1 reply 0 retweets 3 likes
    3. Rich Felker‏ @RichFelker Jan 10
      Replying to @RichFelker @whitequark

      Also if the program was invoked via a symlink, it will be the pathname of the symlink, not the file the symlink resolved to.

      1 reply 0 retweets 2 likes
      Rich Felker‏ @RichFelker Jan 10
      Replying to @RichFelker @whitequark

      In particular if you re-exec'd /proc/self/exe or if fexecve exec'd /proc/self/fd/%d, then AT_EXECFN is utterly meaningless.

      9:43 AM - 10 Jan 2018
      • 3 Likes
      • kdave mario_vilas.py 🐊 whitequark
      0 replies 0 retweets 3 likes

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