[Bug libc/12155] New: MALLOC_MMAP_THRESHOLD_ and MALLOC_MMAP_MAX_ (wrongly) have effect in setgid programs

["mtk.manpages at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12155

           Summary: MALLOC_MMAP_THRESHOLD_ and MALLOC_MMAP_MAX_ (wrongly)
                    have effect in setgid programs
           Product: glibc
           Version: 2.12
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: mtk.manpages@gmail.com


Almost all of the the MALLOC_*_ environment variables that affect malloc() etc.
are disabled (reasonably, for security) in set-user-ID and set-group-ID
programs. However, while MALLOC_MMAP_THRESHOLD_ and MALLOC_MMAP_MAX_ are
disabled for set-user-ID programs, they DO have an effect for set-group-ID
programs. I have inspected the glibc source, and can't see why these variables
have an effect in set-group-ID programs, but my text programs show that they do
have an effect.

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