From: tiemeezeiv@wilsonb.com
To: dash@vger.kernel.org
Subject: Stack overflow on unbounded recursion
Date: Thu, 28 May 2020 17:17:38 +0900 [thread overview]
Message-ID: <2PA16BT5WNILQ.2352UZK7LJF4P@wilsonb.com> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 798 bytes --]
Tested this against master at commit 3e3e7af1:
$ src/dash -c 'f(){ f;};f'
segfault
Of course this is a pathological command string, but it looks like a clear case
of stack overflow:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000407762 in argstr (p=0x4204b0 "f", flag=flag@entry=3) at expand.c:249
249 int breakall = (flag & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
(gdb) info proc mappings
...
0x7ffff7ffe000 0x7ffff7fff000 0x1000 0x0
0x7fffff7ff000 0x7ffffffff000 0x800000 0x0 [stack]
(gdb) p/x $rsp
$1 = 0x7fffff7fef50
(gdb) x/i $rip
=> 0x407762 <argstr+34>: sete 0x7(%rsp)
Is this a bug or have I just stumbled into a known "feature"?
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 260 bytes --]
reply other threads:[~2020-05-28 8:22 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=2PA16BT5WNILQ.2352UZK7LJF4P@wilsonb.com \
--to=tiemeezeiv@wilsonb.com \
--cc=dash@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).