x86-64 memcmp: Use unsigned Jcc instructions on size [BZ #24155]

[thirdparty/glibc.git] / ChangeLog

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+2019-02-04  H.J. Lu  <hongjiu.lu@intel.com>
+
+       [BZ #24155]
+       CVE-2019-7309
+       * NEWS: Updated for CVE-2019-7309.
+       * sysdeps/x86_64/memcmp.S: Use RDX_LP for size.  Clear the
+       upper 32 bits of RDX register for x32.  Use unsigned Jcc
+       instructions, instead of signed.
+       * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memcmp-2.
+       * sysdeps/x86_64/x32/tst-size_t-memcmp-2.c: New test.
+
 2019-02-01  H.J. Lu  <hongjiu.lu@intel.com>
 
        [BZ #24097]