Fixes the following security vulnerabilities:
CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
32 bits of a 64-bit register with with non-zero upper 32 bit. When it
happened, accessing the 32-bit size_t value as the full 64-bit register
in the assembly string/memory functions would cause a buffer overflow.
Reported by H.J. Lu.
CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
size. For x86-64, memcmp on an object size larger than SSIZE_MAX
has undefined behavior. On x32, the size_t argument may be passed
in the lower 32 bits of the 64-bit RDX register with non-zero upper
32 bits. When it happened with the sign bit of RDX register set,
memcmp gave the wrong result since it treated the size argument as
zero. Reported by H.J. Lu.
CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
addresses with arbitrary trailing characters, potentially leading to data
or command injection issues in applications.
CVE-2019-9169: Attempted case-insensitive regular-expression match
via proceed_next_node in posix/regexec.c leads to heap-based buffer
over-read. Reported by Hongxu Chen.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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