MGASA-2019-0349

Updated glibc packages fixes the following security issue:

On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program (CVE-2019-19126).

Other upstream fixes in this update:

• Call _dl_open_check after relocation [BZ #24259]
• support: Export bindir path on support_path
• nss_db: fix endent wrt NULL mappings [BZ #24695] [BZ #24696]
• elf: Refuse to dlopen PIE objects [BZ #24323]
• Fix alignment of TLS variables for tls variant TLS_TCB_AT_TP [BZ #23403]
• Fix assertion in malloc.c:tcache_get
• Small tcache improvements
• malloc: Remove unwanted leading whitespace in malloc_info [BZ #24867]
• malloc: Fix missing accounting of top chunk in malloc_info [BZ #24026]
• Add glibc.malloc.mxfast tunable
• malloc: Various cleanups for malloc/tst-mxfast
• Base max_fast on alignment, not width, of bins [BZ #24903]
• Linux: Use in-tree copy of SO_ constants for !__USE_MISC [BZ #24532]