[Bug 20102] New: malloc(3) should document MALLOC_PERTURB_ env option

[Bug 20102] New: malloc(3) should document MALLOC_PERTURB_ env option

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=20102

           Summary: malloc(3) should document MALLOC_PERTURB_ env option
           Product: Documentation
           Version: unspecified
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
        AssignedTo: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
        ReportedBy: vapier-aBrp7R+bbdUdnm+yROfE0A@public.gmane.org
        Regression: No


setting MALLOC_PERTURB_ in the env will take that number and initialize all
malloc's with that value (and the inverse when freeing).  this should be
documented in malloc(3) (and noted in free(3)).

e.g. if you set MALLOC_PERTURB_=123, glibc will do memset((123 ^ 0xff) & 0xff)
when doing malloc(), and then glibc will do memset(123 & 0xff) when doing
free()

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[Bug 20102] malloc(3) should document MALLOC_PERTURB_ env option

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=20102


Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org




--- Comment #1 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2010-10-23 12:31:55 ---
Mike,

Thanks for the heads-up on this. Looking closer, there are a bunch of these
environment variables that are undocumented, and they're also closely related
to the mallopt() library function, which is also undocumented. I think it would
be best to document all of this stuff together, and best done on a mallopt(3)
page, rather that in the existing malloc(3). (And yes, the MALLOC_TRACE_ info
that is currently in mallopt(3) should probably also move to the to-be-created
mallopt(3) page.) I'll get onto this.

Thanks,

Michael

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[Bug 20102] malloc(3) should document MALLOC_PERTURB_ env option

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=20102


Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|documentation_man-pages@ker |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
                   |nel-bugs.osdl.org           |




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