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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 20 Apr 2018
      • Report Tweet
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      Replying to @DrScriptt

      Uh, no, that's impossible (without using root-only debug facilities). Doing so would be a massive security hole.

      1 reply 0 retweets 0 likes
    2. Grant Taylor‏ @DrScriptt 20 Apr 2018
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      Replying to @marcan42

      I’m fairly certain that it is possible to create a hard link to an inode even if you can’t access the directory that the other file linked to the inode is in. @ssrjazz what do you think? o+w on the inode in question and +w on the directory I’m creating the new link in.

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 20 Apr 2018
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      Replying to @DrScriptt @ssrjazz

      Write the code, file the CVE, and get the sweet PoC karma then ;-)

      1 reply 0 retweets 0 likes
    4. Grant Taylor‏ @DrScriptt 20 Apr 2018
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      Replying to @marcan42 @ssrjazz

      Nope. I don’t know how to do it myself. Besides I believe that I’ve read about it multiple times in the past. So nothing new.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 20 Apr 2018
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      Replying to @DrScriptt @ssrjazz

      Citation needed.

      1 reply 0 retweets 0 likes
    6. Grant Taylor‏ @DrScriptt 20 Apr 2018
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      Replying to @marcan42 @ssrjazz

      Quick search undeleting open files returns debugfs to create new links to an inode. You just need the inode number and a place to create the link.

      2 replies 0 retweets 0 likes
    7. Grant Taylor‏ @DrScriptt 20 Apr 2018
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      Replying to @DrScriptt @marcan42 @ssrjazz

      I’m confident that there are other ways to create a new link to an existing inode.

      3 replies 0 retweets 0 likes
    8. Grant Taylor‏ @DrScriptt 20 Apr 2018
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      Replying to @DrScriptt @marcan42 @ssrjazz

      I’m sure that I’ve read about people writing small programs to do exactly this.

      2 replies 0 retweets 0 likes
    9. Grant Taylor‏ @DrScriptt 20 Apr 2018
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      Replying to @DrScriptt @marcan42 @ssrjazz

      /bin/ln is not set uid. Seeing as how it can create hard links without root permission, I'm quite confident that root permission is not needed to create a (hard) link to a file.

      1 reply 0 retweets 0 likes
    10. Grant Taylor‏ @DrScriptt 20 Apr 2018
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      Replying to @DrScriptt @marcan42 @ssrjazz

      My understanding is that ln uses access to the existing file to identify the inode to create the link to.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 20 Apr 2018
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      Replying to @DrScriptt @ssrjazz

      Incorrect. The link(2) syscall takes two paths, not an inode and a path. At no point does /bin/ln get to decide what inode is linked. The entire process happens in the kernel.

      11:46 PM - 20 Apr 2018
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