Does the shell spec clearly indicate what characters can make a valid
environment variable? I don't remember at this time...
Reviewed-by: Jaben Carsey <jaben.car...@intel.com>
From: Qiu, Shumin
Sent: Monday, December 29, 2014 4:29 PM
To: Carsey, Jaben
Cc: edk2-devel@lists.sourceforge.net
Subject: [edk2] [Patch] ShellPkg: Check the unrecognized environment variable
name before it is removed from command line.
Importance: High
Hi Jaben,
Please help review the attached patch?
Shell seems fail to parse the '%' in command line. We test the following 4
cases:
1)Execute echo "* %c %d *" in the command line, the output is "* %c %d *".
2)Script file a.nsh with the content: echo "* %c %d *", execute the a.nsh, the
output is "* " "d *"
3)Script file a.nsh with the content: echo %1, execute a.nsh "* %c %d *", the
output is "* " "d *"
4)Script file a.nsh with the content: echo %1, script b.nsh with the
content:a.nsh "* %c %d *", execute b.nsh, the output is "*"
The root cause is Shell treat '%c %' as an unrecognized environment variable,
and replace it with a null string (""). The patch add code to check the name of
an unrecognized environment variable, if it's a valid C style identifier then
we do the remove.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin....@intel.com<mailto:shumin....@intel.com>>
Thanks
Shumin
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