Mercurial > vim
view vimtutor.com @ 33879:d418c82f02a4 v9.0.2149
patch 9.0.2149: [security]: use-after-free in exec_instructions()
Commit: https://github.com/vim/vim/commit/5dd41d4b6370b7b7d09d691f9252b3899c66102a
Author: Christian Brabandt <cb@256bit.org>
Date: Mon Dec 4 22:52:23 2023 +0100
patch 9.0.2149: [security]: use-after-free in exec_instructions()
Problem: [security]: use-after-free in exec_instructions()
Solution: get tv pointer again
[security]: use-after-free in exec_instructions()
exec_instructions may access freed memory, if the GA_GROWS_FAILS()
re-allocates memory. When this happens, the typval tv may still point to
now already freed memory. So let's get that pointer again and compare it
with tv. If those two pointers differ, tv is now invalid and we have to
refresh the tv pointer.
closes: #13621
Signed-off-by: Christian Brabandt <cb@256bit.org>
author | Christian Brabandt <cb@256bit.org> |
---|---|
date | Sun, 10 Dec 2023 15:16:17 +0100 |
parents | 6f55637de261 |
children |
line wrap: on
line source
$ ! $ !===================================================================== $ ! $ ! VimTutor.com version 29-Aug-2002 $ ! $ ! Author: Tom Wyant <Thomas.R.Wyant-III@usa.dupont.com> $ ! $ ! This DCL command procedure executes the vimtutor command $ ! (surprise, surprise!) which gives you a brief tutorial on the $ ! VIM editor. Languages other than the default are supported in $ ! the usual way, as are at least some of the command qualifiers, $ ! though you'll need to play some fairly serious games with DCL $ ! to specify ones that need quoting. $ ! $ ! Copyright (c) 2002 E. I. DuPont de Nemours and Company, Inc $ ! $ ! This program is free software; you can redistribute it and/or $ ! modify it under the terms of the VIM license as available from $ ! the vim 6.1 ":help license" command or (at your option) the $ ! license from any later version of vim. $ ! $ ! This program is distributed in the hope that it will be useful, $ ! but WITHOUT ANY WARRANTY; without even the implied warranty of $ ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ ! $ !===================================================================== $ ! $ ! $ ! Check for the existence of VIM, and die if it isn't there. $ ! $ if f$search ("vim:vim.exe") .eqs. "" $ then $ write sys$error "Error - Can't run tutorial. VIM not found." $ exit $ endif $ ! $ ! $ ! Pick up the argument, if any. $ ! $ inx = 0 $ arg_loop: $ inx = inx + 1 $ if f$type (p'inx') .nes. "" $ then $ if p'inx' .nes. "" .and. f$locate ("-", p'inx') .ne. 0 $ then $ xx = p'inx' $ assign/nolog "''xx'" xx $ p'inx' = "" $ endif $ goto arg_loop $ endif $ ! $ ! $ ! Make sure we clean up our toys when we're through playing. $ ! $ on error then goto exit $ ! $ ! $ ! Create the VIM foreign command if needed $ ! $ if f$type (vim) .eqs. "" then vim := $vim:vim $ ! $ ! $ ! Build the name for our temp file. $ ! $ tutfil = "sys$login:vimtutor_" + - f$edit (f$getjpi (0, "pid"), "trim") + "." $ assign/nolog 'tutfil' TUTORCOPY $ ! $ ! $ ! Copy the selected file to the temp file $ ! $ assign/nolog/user nla0: sys$error $ assign/nolog/user nla0: sys$output $ vim -u "NONE" -c "so $VIMRUNTIME/tutor/tutor.vim" $ ! $ ! $ ! Run the tutorial $ ! $ assign/nolog/user sys$command sys$input $ vim -u "NONE" -c "set nocp" 'p1' 'p2' 'p3' 'p4' 'p5' 'p6' 'p7' 'p8' 'tutfil' $ ! $ ! $ ! Ditch the copy. $ ! $ exit: $ if f$type (tutfil) .nes. "" .and. f$search (tutfil) .nes. "" then - $ delete 'tutfil';* $ if f$type (xx) .nes. "" then deassign xx $ deassign TUTORCOPY $ exit $ ! $ !===================================================================== $ ! $ ! Modification history $ ! $ ! 29-Aug-2002 T. R. Wyant $ ! Changed license to vim. $ ! Fix error "input is not from a terminal" $ ! Juggle documentation (copyright and contact to front, $ ! modification history to end). $ ! 25-Jul-2002 T. R. Wyant $ ! Initial version