Re: Bash 5.3 crashes appending to array being declared

[Chet Ramey]

On 8/12/25 11:29 PM, Nathan Mills wrote:

Bash Version: 5.2
Patch Level: 37
Release Status: release

Affected Bash versions: 5.2.37, 5.3.0-gf6cfb14 (Aug 8, 2025), possibly
other versions

Description:

Bash 5.3 crashes appending to array being declared

Thanks for the detailed report and analysis. This is specific to the `_'
variable and simple commands. The problem isn't the temporary environment,
but the way the simple command execution sets `_' to the last argument to
the command after expansion: it doesn't consider that the temporary
environment might contain `_' as an array variable (which it normally
should not).

Here's the simple fix.

*** ../bash-5.3-patched/execute_cmd.c   Thu Jun  5 11:02:01 2025
--- execute_cmd.c       Thu Aug 14 08:58:17 2025
***************
*** 4192,4196 ****
    if (arg == 0)
      arg = "";
!   var = bind_variable ("_", arg, 0);
    if (var)
      VUNSETATTR (var, att_exported);
--- 4157,4161 ----
    if (arg == 0)
      arg = "";
!   var = bind_variable ("_", arg, ASS_NOTEMPENV);
    if (var)
      VUNSETATTR (var, att_exported);

Chet

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    c...@case.edu    http://tiswww.cwru.edu/~chet/

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