[Bug dynamic-link/22149] New: cache.c:save_cache creates zero-size VLA

["schwab at linux-m68k dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22149

            Bug ID: 22149
           Summary: cache.c:save_cache creates zero-size VLA
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
  Target Milestone: ---

The C standard does not allow creating a VLA with zero size, but save_cache
tries to do so when the padding is zero.  This causes misbehaviour with the
proposed -fstack-clash-protection option of gcc which assumes that it can
always emit at least one stack probe to the allocated space.

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