From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin-patches@cygwin.com
Cc: Johannes Schindelin <johannes.schindelin@gmx.de>
Subject: Re: [PATCH] Cygwin: pty: Fix 'Bad address' error when running 'cmd.exe /c dir'
Date: Sat, 22 Oct 2022 15:12:47 +0900 [thread overview]
Message-ID: <20221022151247.1b1cf1e3fc13d4c3dabc2191@nifty.ne.jp> (raw)
In-Reply-To: <6EED0655-71E5-43B4-988D-B5935AED8EC0@gmx.de>
On Sat, 22 Oct 2022 07:58:37 +0200
Johannes Schindelin wrote:
> On October 22, 2022 7:34:20 AM GMT+02:00, Takashi Yano <takashi.yano@nifty.ne.jp> wrote:
> >- If the command executed is 'cmd.exe /c [...]', runpath in spawn.cc
> > will be NULL. In this case, is_console_app(runpath) check causes
> > access violation. This case also the command executed is obviously
> > console app., therefore, treat it as console app to fix this issue.
> >
> > Addresses: https://github.com/msys2/msys2-runtime/issues/108
> >---
> > winsup/cygwin/spawn.cc | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> >diff --git a/winsup/cygwin/spawn.cc b/winsup/cygwin/spawn.cc
> >index 5aa52ab1e..4fc842a2b 100644
> >--- a/winsup/cygwin/spawn.cc
> >+++ b/winsup/cygwin/spawn.cc
> >@@ -215,6 +215,8 @@ handle (int fd, bool writing)
> > static bool
> > is_console_app (WCHAR *filename)
> > {
> >+ if (filename == NULL)
> >+ return true; /* The command executed is command.com or cmd.exe. */
> > HANDLE h;
> > const int id_offset = 92;
> > h = CreateFileW (filename, GENERIC_READ, FILE_SHARE_READ,
>
> The commit message of the original patch was substantially clearer and offered a thorough analysis. This patch lost that.
The reason which I did not apply your patch as-is is:
is_console_app() returns false for 'cmd.exe /c [...]' case
with your patch, while it should return true.
--
Takashi Yano <takashi.yano@nifty.ne.jp>
next prev parent reply other threads:[~2022-10-22 6:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-22 5:34 Takashi Yano
2022-10-22 5:58 ` Johannes Schindelin
2022-10-22 6:12 ` Takashi Yano [this message]
2022-10-23 20:42 ` Johannes Schindelin
2022-10-24 9:28 ` Corinna Vinschen
2022-11-18 8:23 ` Johannes Schindelin
2022-11-19 21:38 ` Jeremy Drake
2022-11-21 11:47 ` Corinna Vinschen
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