Mercurial > vim
view runtime/indent/pov.vim @ 33664:06b59278bfcf v9.0.2070
patch 9.0.2070: [security] disallow setting env in restricted mode
Commit: https://github.com/vim/vim/commit/6b89dd6a7257a1e2e9c7ea070b407bc4674a5118
Author: Christian Brabandt <cb@256bit.org>
Date: Thu Oct 26 22:14:17 2023 +0200
patch 9.0.2070: [security] disallow setting env in restricted mode
Problem: [security] disallow setting env in restricted mode
Solution: Setting environment variables in restricted mode could
potentially be used to execute shell commands. Disallow this.
restricted mode: disable allow setting of environment variables
Setting environment variables in restricted mode, may have some unwanted
consequences. So, for example by setting $GCONV_PATH in restricted mode
and then calling the iconv() function, one may be able to execute some
unwanted payload, because the `iconv_open()` function internally uses
the `$GCONV_PATH` variable to find its conversion data.
So let's disable setting environment variables, even so this is no
complete protection, since we are not clearing the existing environment.
I tried a few ways but wasn't successful :(
One could also argue to disable the iconv() function completely in
restricted mode, but who knows what other API functions can be
influenced by setting some other unrelated environment variables.
So let's leave it as it is currently.
closes: #13394
See: https://huntr.com/bounties/b0a2eda1-459c-4e36-98e6-0cc7d7faccfe/
Signed-off-by: Christian Brabandt <cb@256bit.org>
author | Christian Brabandt <cb@256bit.org> |
---|---|
date | Thu, 26 Oct 2023 22:30:03 +0200 |
parents | 4d76b3e07c07 |
children |
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" Vim indent file " Language: PoV-Ray Scene Description Language " Maintainer: David Necas (Yeti) <yeti@physics.muni.cz> " Last Change: 2017 Jun 13 " 2022 April: b:undo_indent added by Doug Kearns " URI: http://trific.ath.cx/Ftp/vim/indent/pov.vim " Only load this indent file when no other was loaded. if exists("b:did_indent") finish endif let b:did_indent = 1 " Some preliminary settings. setlocal nolisp " Make sure lisp indenting doesn't supersede us. setlocal indentexpr=GetPoVRayIndent() setlocal indentkeys+==else,=end,0] let b:undo_indent = "setl inde< indk< lisp<" " Only define the function once. if exists("*GetPoVRayIndent") finish endif " Counts matches of a regexp <rexp> in line number <line>. " Doesn't count matches inside strings and comments (as defined by current " syntax). function! s:MatchCount(line, rexp) let str = getline(a:line) let i = 0 let n = 0 while i >= 0 let i = matchend(str, a:rexp, i) if i >= 0 && synIDattr(synID(a:line, i, 0), "name") !~? "string\|comment" let n = n + 1 endif endwhile return n endfunction " The main function. Returns indent amount. function GetPoVRayIndent() " If we are inside a comment (may be nested in obscure ways), give up if synIDattr(synID(v:lnum, indent(v:lnum)+1, 0), "name") =~? "string\|comment" return -1 endif " Search backwards for the first non-empty, non-comment line. let plnum = prevnonblank(v:lnum - 1) let plind = indent(plnum) while plnum > 0 && synIDattr(synID(plnum, plind+1, 0), "name") =~? "comment" let plnum = prevnonblank(plnum - 1) let plind = indent(plnum) endwhile " Start indenting from zero if plnum == 0 return 0 endif " Analyse previous nonempty line. let chg = 0 let chg = chg + s:MatchCount(plnum, '[[{(]') let chg = chg + s:MatchCount(plnum, '#\s*\%(if\|ifdef\|ifndef\|switch\|while\|macro\|else\)\>') let chg = chg - s:MatchCount(plnum, '#\s*end\>') let chg = chg - s:MatchCount(plnum, '[]})]') " Dirty hack for people writing #if and #else on the same line. let chg = chg - s:MatchCount(plnum, '#\s*\%(if\|ifdef\|ifndef\|switch\)\>.*#\s*else\>') " When chg > 0, then we opened groups and we should indent more, but when " chg < 0, we closed groups and this already affected the previous line, " so we should not dedent. And when everything else fails, scream. let chg = chg > 0 ? chg : 0 " Analyse current line " FIXME: If we have to dedent, we should try to find the indentation of the " opening line. let cur = s:MatchCount(v:lnum, '^\s*\%(#\s*\%(end\|else\)\>\|[]})]\)') if cur > 0 let final = plind + (chg - cur) * shiftwidth() else let final = plind + chg * shiftwidth() endif return final < 0 ? 0 : final endfunction