mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-04-17 11:08:06 -05:00
ec158a2e19
A user reported that the following sequence of events leads to Pageant crashing: - load an encrypted key into Pageant for decryption later - attempt to use the key, so that Pageant prompts for the passphrase - before entering the passphrase, abort the attempt to use the key (e.g. by closing the PuTTY that was trying to use it) - now enter the passphrase at the Pageant prompt, once the need for it has gone away. Once the key is decrypted, unblock_requests_for_key() goes through the linked list of blocked PageantSignOp attached to the private key record it's just decrypted, and tries to unblock them. The PageantSignOp belonging to the aborted Pageant request is still linked on that list, which it shouldn't be, because it's also been freed by pageant_unregister_client when that traversed the separate linked list of PageantAsyncOp associated with that client connection. So the private key's list of blocked requests contained a stale pointer. Now PageantSignOp's implementation of the PageantAsyncOp free method makes sure to unlink the signop from any list it's on before freeing it.
PuTTY source code README
========================
This is the README for the source code of PuTTY, a free Windows and
Unix Telnet and SSH client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), the general method is
to run these commands in the source directory:
cmake .
cmake --build .
These commands will expect to find a usable compile toolchain on your
path. So if you're building on Windows with MSVC, you'll need to make
sure that the MSVC compiler (cl.exe) is on your path, by running one
of the 'vcvars32.bat' setup scripts provided with the tools. Then the
cmake commands above should work.
To install in the simplest way on Linux or Mac:
cmake --build . --target install
On Unix, pterm would like to be setuid or setgid, as appropriate, to
permit it to write records of user logins to /var/run/utmp and
/var/log/wtmp. (Of course it will not use this privilege for
anything else, and in particular it will drop all privileges before
starting up complex subsystems like GTK.) The cmake install step
doesn't attempt to add these privileges, so if you want user login
recording to work, you should manually ch{own,grp} and chmod the
pterm binary yourself after installation. If you don't do this,
pterm will still work, but not update the user login databases.
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory. If you aren't using one of our source snapshots,
you'll need to do this yourself. Halibut can be found at
<https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.