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Fix subshell file descriptor leak

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A file descriptor (at least 3, can't reproduce for 4 and up) opened
with 'exec' or 'redirect' in a virtual/non-forked subshell survived
that subshell after exiting it:

    $ ksh -c '(redirect 3>&1); echo bug >&3'
    bug

src/cmd/ksh93/sh/io.c:
- Apply a patch from OpenSUSE (ksh93-redirectleak.dif). Source:
  https://build.opensuse.org/package/show/openSUSE:Leap:42.3:Update/ksh

src/cmd/ksh93/tests/io.sh:
- Add regression test.

Thanks to Marc Wilson for flagging this up.
This commit is contained in:
Martijn Dekker 2020-07-21 04:02:47 +01:00
parent 0c96f9749b
commit db72f41f4b
3 changed files with 23 additions and 0 deletions
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@ -8,6 +8,9 @@ Any uppercase BUG_* names are modernish shell bug IDs.
- If a shell function and a built-in command by the same name exist,
'whence -a' and 'type -a' now report both.
- Fixed a bug that caused file descriptors opened with 'redirect' or 'exec'
to survive a subshell environment after exiting it.
2020-07-19:
- Fixed a crash that occured in the '.' command when using kshdb.