cvs commit: src/lib/libmemstat memstat_uma.c

[Robert Watson]

rwatson     2006-02-11 19:19:29 UTC

  FreeBSD src repository

  Modified files:
    lib/libmemstat       memstat_uma.c 
  Log:
  The uma_zone data structure defines the size of its uz_cpu[] array as 1,
  but then sizes the containing data structure at run-time to make room
  for per-cpu cache data.  Modify libmemstat to separately allocate a
  buffer to hold per-cpu cache data, sized based on the run-time mp_maxid
  variable when using libkvm to access UMA data.  This avoids reading
  invalid cache data from beyond the end of the uma_zone data structure
  on the stack, which can result in invalid statistics and/or reads from
  invalid kernel addresses.
  
  Foot target practice by:        ps
  MFC after:                      3 days
  
  Revision  Changes    Path
  1.16      +24 -2     src/lib/libmemstat/memstat_uma.c