• 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: default avatarTobin C. Harding <me@tobin.cc>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
leaking_addresses.pl 6.56 KB