N**BSD-SA2023-003 Structure padding memory disclosures

[Takehiko NOZAKI]

see https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2023-003.txt.asc

[Takehiko NOZAKI]

releng.netbsd.org/cgi-bin/req-8.cgi?show=1833

[Takehiko NOZAKI]

BUGFIX: Issue #362 - N**BSD-SA2023-003 Structure padding memory disclosures see https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2023-003.txt.asc

patches are derived from:

• http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/compat/netbsd32/netbsd32.h.diff?r1=1.136&r2=1.137
• http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/compat/netbsd32/netbsd32_conv.h.diff?r1=1.44&r2=1.45
• http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/compat/netbsd32/netbsd32_fs.c.diff?r1=1.91&r2=1.92
• http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/compat/netbsd32/netbsd32_netbsd.c.diff?r1=1.231&r2=1.232

• http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/compat/netbsd32/netbsd32_socket.c.diff?r1=1.55&r2=1.56 The read/write/send/recv system calls return ssize_t because -1 is returned on error. Therefore we must restrict the lengths of any buffers to NETBSD32_SSIZE_MAX with compat32 to avoid garbage return values.

  Fixes ATF lib/libc/sys/t_write:write_err.

→ <<cset 62d9addc5392>>