1. 06 Nov, 2017 1 commit
    • Tobin C. Harding's avatar
      scripts: add leaking_addresses.pl · 136fc5c4
      Tobin C. Harding authored
      Currently we are leaking addresses from the kernel to user space. This
      script is an attempt to find some of those leakages. Script parses
      `dmesg` output and /proc and /sys files for hex strings that look like
      kernel addresses.
      
      Only works for 64 bit kernels, the reason being that kernel addresses on
      64 bit kernels have 'ffff' as the leading bit pattern making greping
      possible. On 32 kernels we don't have this luxury.
      
      Scripts is _slightly_ smarter than a straight grep, we check for false
      positives (all 0's or all 1's, and vsyscall start/finish addresses).
      
      [ I think there is a lot of room for improvement here, but it's already
        useful, so I'm merging it as-is. The whole "hash %p format" series is
        expected to go into 4.15, but will not fix %x users, and will not
        incentivize people to look at what they are leaking.     - Linus ]
      Signed-off-by: 's avatarTobin C. Harding <me@tobin.cc>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
      136fc5c4