CVS commit: src/sys

["Ryo Shimizu" <ryo%netbsd.org@localhost>]

Module Name:    src
Committed By:   ryo
Date:           Fri Nov 26 08:06:12 UTC 2021

Modified Files:
        src/sys/compat/common: kern_sig_16.c
        src/sys/compat/netbsd32: netbsd32_compat_16.c
        src/sys/kern: kern_exec.c
        src/sys/sys: exec.h

Log Message:
Fix anonymous memory object leak for sigcode.

- Repeating "modload compat_linux && /emul/linux/bin/ls && modunload compat_linux"
  will reproduce this problem.
- It cause in exec_sigcode_map(), anon-object for sigcode was created at
  first exec, but it remained even after exec_remove.
- Fixed that the anon-object for sigcode is created at exec_add(), and the
  anon-object reference is removed at exec_remove().
- sigobject_lock is no longer needed since it is locked by exec_lock.
- The compat_16 module rewrites the e_sigcode entry in emul_netbsd directly and
  does not use exec_add()/exec_remove(), so it needs to call
  sigcode_alloc()/sigcode_free() on its own.


To generate a diff of this commit:
cvs rdiff -u -r1.6 -r1.7 src/sys/compat/common/kern_sig_16.c
cvs rdiff -u -r1.3 -r1.4 src/sys/compat/netbsd32/netbsd32_compat_16.c
cvs rdiff -u -r1.513 -r1.514 src/sys/kern/kern_exec.c
cvs rdiff -u -r1.160 -r1.161 src/sys/sys/exec.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.