CVS commit: src/bin/ps

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Fri Jan 12 23:01:14 UTC 2018

Modified Files:
        src/bin/ps: ps.c

Log Message:
Fix an unitialized memory read bug in ps(1)

rawcpu of type int, is declared inside main(){} and it can be passed as
uninitialized to setpinfo().
The setpinfo() function has a switch checking the value of rawcpu:

  if (!rawcpu)
    pi[i].pcpu /= 1.0 - exp(ki[i].p_swtime * log_ccpu);

rawcpu is set to 1 with the command line argument "-C".

   -C           Change the way the CPU percentage is calculated by using a
                "raw" CPU calculation that ignores "resident" time (this
                normally has no effect).

Bug reproducible with an invocation: "ps u". It hides with "ps uC".

Initialize rawcpu by default to 0, before the getopt(3) machinery.

Detected with MSan running on NetBSD/amd64.

Sponsored by <The NetBSD Foundation>


To generate a diff of this commit:
cvs rdiff -u -r1.88 -r1.89 src/bin/ps/ps.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.