[Bug 1952584] [NEW] bash exec command unwanted behaviour

[Ümit Atakul]

Public bug reported:

(GNU bash 4.3.46)
(ubuntu 16.04 LTS)

Consider you have out.txt on current dir.
-------
>exec 123456789012>out.txt
bash: exec: 123456789012: not found
-------
exec command prints indicated error for large numbers that is supposed to use as a fd but redirects /proc/$$/fd/1 to out.txt silently.

Additionally,
-------
>exec 1234567890>out.txt
bash: 123456789: Bad file descriptor
-------
For large numbers but not that large (I don't inspect the limits!), exec command rejects fd number but silently adds a new fd to current bash process. In every execution of the command, bash adds a new fd to itself again and again.

** Affects: bash (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1952584

Title:
  bash exec command unwanted behaviour

Status in bash package in Ubuntu:
  New

Bug description:
  (GNU bash 4.3.46)
  (ubuntu 16.04 LTS)

  Consider you have out.txt on current dir.
  -------
  >exec 123456789012>out.txt
  bash: exec: 123456789012: not found
  -------
  exec command prints indicated error for large numbers that is supposed to use as a fd but redirects /proc/$$/fd/1 to out.txt silently.

  Additionally,
  -------
  >exec 1234567890>out.txt
  bash: 123456789: Bad file descriptor
  -------
  For large numbers but not that large (I don't inspect the limits!), exec command rejects fd number but silently adds a new fd to current bash process. In every execution of the command, bash adds a new fd to itself again and again.

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