Infinite recursion makes bash segfault
Hi,
I found bash segfaults when running into an infinite recursion (details
below). I would expect it to either stop (or possibly exit) with a clear
error message instead. Here are the details (as given by bashbug). The
problem also happens with the latest bash version (5.2.0(1)-beta).
Yours,
J. Courant.
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2
-fdebug-prefix-map=/build/bash-Smvct5/bash-5.0=.
-fstack-protector-strong -Wformat -Werror=format-security -Wall
-Wno-parentheses -Wno-format-security
uname output: Linux judicael-XPS-15-9500 5.13.0-40-generic
#45~20.04.1-Ubuntu SMP Mon Apr 4 09:38:31 UTC 2022 x86_64 x86_64 x86_64
GNU/Linux
Machine Type: x86_64-pc-linux-gnu
Bash Version: 5.0
Patch Level: 17
Release Status: release
Description:
Infinite recursion causes bash to segfault.
The problem happens in interactive mode as well as in scripts.
Repeat-By:
~$ bash
~$ foo () { foo; }; foo
Segmentation fault (core dumped)
~$
--
Judicaël Courant
Software Engineer, TrustInSoft
(+33) (0)6 52 42 88 23
https://trust-in-soft.com
Re: Infinite recursion makes bash segfault
On 5/5/22 7:10 AM, Judicaël Courant wrote:
Hi,
I found bash segfaults when running into an infinite recursion (details
below). I would expect it to either stop (or possibly exit) with a clear
error message instead. Here are the details (as given by bashbug). The
problem also happens with the latest bash version (5.2.0(1)-beta).
Yes. If you recurse indefinitely, you will eventually exceed your stack
size resource limit and get the prescribed fatal signal.
Description:
Infinite recursion causes bash to segfault.
The problem happens in interactive mode as well as in scripts.
Repeat-By:
~$ bash
~$ foo () { foo; }; foo
Segmentation fault (core dumped)
~$
If you are worried about this, set the FUNCNEST shell variable to an
appropriate value.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
