On Fri, Jul 11, 2014 at 07:25:06AM +0000, Doug Hogan wrote:
> On Fri, Jul 11, 2014 at 01:03:54AM -0600, Anthony J. Bentley wrote:
> > In addition to what jmc said, if you document these flags they need to
> > be marked up with the Cm macro instead of ASCII single quotes.
>
> My mistake. Fixed version:
>
>
> Index: lib/libc/stdlib/malloc.3
> ===================================================================
> RCS file: /cvs/src/lib/libc/stdlib/malloc.3,v
> retrieving revision 1.78
> diff -u -p -d -r1.78 malloc.3
> --- lib/libc/stdlib/malloc.3 1 May 2014 18:41:59 -0000 1.78
> +++ lib/libc/stdlib/malloc.3 11 Jul 2014 07:19:27 -0000
> @@ -220,10 +220,23 @@ Malloc will first look for a symbolic li
> .Pa /etc/malloc.conf
> and next check the environment for a variable called
> .Ev MALLOC_OPTIONS
> +(if not
> +.Xr issetugid 2 )
> and finally for the global variable
> .Va malloc_options
> and scan them for flags in that order.
> Flags are single letters, uppercase means on, lowercase means off.
> +.Pp
> +The default flags are
> +.Cm A
> +and
> +.Cm P ,
you could keep that briefer by using:
...are
.Cm AP ,
> +small chunks are always junked, and the first
> +part of the pages is junked after free.
> +The default junk behavior does not correspond to
> +.Cm j
> +or
> +.Cm J .
> .Bl -tag -width indent
> .It Cm A
> .Dq Abort .
> @@ -271,6 +284,7 @@ Currently junk is bytes of 0xd0 when all
> .Dq Duh .
> \&:-)
> Freed chunks are filled with 0xdf.
> +This performs more junking than by default.
> .It Cm j
> .Dq Don't Junk .
> By default, small chunks are always junked, and the first part of pages
> @@ -297,6 +311,11 @@ This can substantially aid in compacting
> .\"Consult the source for this one.
> .It Cm S
> Enable all options suitable for security auditing.
> +This currently enables flags
> +.Cm U ,
> +.Cm J ,
> +.Cm G
here too.
> +and sets the free cache page size to 0.
> .It Cm U
> .Dq Free unmap .
> Enable use after free protection for larger allocations.
>
jmc
