[Bug dynamic-link/21502] New: Excessive memory allocation due to LD_HWCAP_MASK

["siddhesh at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21502

            Bug ID: 21502
           Summary: Excessive memory allocation due to LD_HWCAP_MASK
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: siddhesh at sourceware dot org
          Reporter: siddhesh at sourceware dot org
  Target Milestone: ---

It was discovered that setting LD_HWCAP_MASK to a large numeric value results
in significant memory allocation in the dynamic linker and sometimes results in
malloc failure, causing the program to crash.  A simple test like this
demonstrates the problem:

LD_HWCAP_MASK=0xffffffffffffffff /bin/true

On a system with constrained overcommit, this should fail with the following
error:

/bin/true: error while loading shared libraries: cannot create capability list:
Cannot allocate memory

or at least take a very long time to finish.

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