[screen-devel] [bug #47546] On resizing screen may cause an out of bounds memory read

[Hanno Boeck]

URL:
  <http://savannah.gnu.org/bugs/?47546>

                 Summary: On resizing screen may cause an out of bounds memory
read
                 Project: GNU Screen
            Submitted by: hanno
            Submitted on: Sun 27 Mar 2016 01:21:10 PM CEST
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
           Fixed Release: None
         Planned Release: None
           Work Required: None

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Details:

If compiled with address sanitizer screen will sometimes produce out of memory
reads if the window is resized. Unfortunately I wasn't able to completely
isolate the situation when this happens.

To reproduce:
* Compile screen (latest git code) with address sanitizer my using ./configure
CFLAGS="-fsanitize=address -g" LDFLAGS="-fsanitize=address"
* Start screen in a graphical terminal
* Do some things and resize the window.

I'll attach a stack trace from address sanitizer. To see the asan error one
has to use the environment variable ASAN_OPTIONS and set log_path (e.g.
"export ASAN_OPTIONS=log_path=/tmp/asan-error"), because screen will disable
stderr.



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File Attachments:


-------------------------------------------------------
Date: Sun 27 Mar 2016 01:21:10 PM CEST  Name: screen-oob-read-on-resize.txt 
Size: 3kB   By: hanno

<http://savannah.gnu.org/bugs/download.php?file_id=36779>

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