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vim-patch:cd8a3eaf5348
runtime(dist): centralize safe executable check and add vim library (vim/vim#13413)
Follow up to 816fbcc26 (patch 9.0.1833: [security] runtime file fixes,
2023-08-31) and f7ac0ef50 (runtime: don't execute external commands when
loading ftplugins, 2023-09-06).
This puts the logic for safe executable checks in a single place, by introducing
a central vim library, so all filetypes benefit from consistency.
Notable changes:
- dist#vim because the (autoload) namespace for a new runtime support
library. Supporting functions should get documentation. It might make
life easier for NeoVim devs to make the documentation a new file
rather than cram it into existing files, though we may want
cross-references to it somewhere…
- The gzip and zip plugins need to be opted into by enabling execution
of those programs (or the global plugin_exec). This needs
documentation or discussion.
- This fixes a bug in the zig plugin: code setting s:tmp_cwd was removed
in f7ac0ef50 (runtime: don't execute external commands when loading
ftplugins, 2023-09-06), but the variable was still referenced. Since
the new function takes care of that automatically, the variable is no
longer needed.
cd8a3eaf53
Co-authored-by: D. Ben Knoble <ben.knoble+github@gmail.com>
This commit is contained in:
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8ae39eb584
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17
runtime/autoload/dist/vim.vim
vendored
Normal file
17
runtime/autoload/dist/vim.vim
vendored
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@ -0,0 +1,17 @@
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vim9script
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# Vim runtime support library
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#
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# Maintainer: The Vim Project <https://github.com/vim/vim>
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# Last Change: 2023 Oct 25
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export def IsSafeExecutable(filetype: string, executable: string): bool
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var cwd = getcwd()
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return get(g:, filetype .. '_exec', get(g:, 'plugin_exec', 0))
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&& (fnamemodify(exepath(executable), ':p:h') !=# cwd
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|| (split($PATH, has('win32') ? ';' : ':')->index(cwd) != -1
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&& cwd != '.'))
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enddef
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# Uncomment this line to check for compilation errors early
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# defcompile
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@ -11,10 +11,7 @@ fun s:check(cmd)
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let name = substitute(a:cmd, '\(\S*\).*', '\1', '')
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if !exists("s:have_" . name)
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" safety check, don't execute anything from the current directory
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let s:tmp_cwd = getcwd()
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let f = (fnamemodify(exepath(name), ":p:h") !=# s:tmp_cwd
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\ || (index(split($PATH,has("win32")? ';' : ':'), s:tmp_cwd) != -1 && s:tmp_cwd != '.'))
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unlet s:tmp_cwd
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let f = dist#vim#IsSafeExecutable('gzip', name)
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if !f
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echoerr "Warning: NOT executing " .. name .. " from current directory!"
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endif
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@ -57,14 +57,10 @@ if !exists("g:zip_extractcmd")
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let g:zip_extractcmd= g:zip_unzipcmd
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endif
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let s:tmp_cwd = getcwd()
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if (fnamemodify(exepath(g:zip_unzipcmd), ":p:h") ==# getcwd()
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\ && (index(split($PATH,has("win32")? ';' : ':'), s:tmp_cwd) == -1 || s:tmp_cwd == '.'))
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unlet s:tmp_cwd
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if !dist#vim#IsSafeExecutable('zip', g:zip_unzipcmd)
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echoerr "Warning: NOT executing " .. g:zip_unzipcmd .. " from current directory!"
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finish
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endif
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unlet s:tmp_cwd
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" ----------------
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" Functions: {{{1
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@ -37,8 +37,8 @@ if exists("g:awk_is_gawk")
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let b:undo_ftplugin .= " | setl fp<"
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endif
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" Disabled by default for security reasons.
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if get(g:, 'awk_exec', get(g:, 'plugin_exec', 0))
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" Disabled by default for security reasons.
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if dist#vim#IsSafeExecutable('awk', 'gawk')
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let path = system("gawk 'BEGIN { printf ENVIRON[\"AWKPATH\"] }'")
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let path = substitute(path, '^\.\=:\|:\.\=$\|:\.\=:', ',,', 'g') " POSIX cwd
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let path = substitute(path, ':', ',', 'g')
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@ -57,8 +57,8 @@ if &filetype == 'changelog'
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endif
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let s:default_login = 'unknown'
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" Disabled by default for security reasons.
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if get(g:, 'changelog_exec', get(g:, 'plugin_exec', 0))
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" Disabled by default for security reasons.
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if dist#vim#IsSafeExecutable('changelog', 'whoami')
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let login = s:login()
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else
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let login = s:default_login
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@ -56,12 +56,8 @@ endif
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" Set this once, globally.
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if !exists("perlpath")
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let s:tmp_cwd = getcwd()
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" safety check: don't execute perl binary by default
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if executable("perl") && get(g:, 'perl_exec', get(g:, 'plugin_exec', 0))
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\ && (fnamemodify(exepath("perl"), ":p:h") != s:tmp_cwd
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\ || (index(split($PATH, has("win32") ? ';' : ':'), s:tmp_cwd) != -1
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\ && s:tmp_cwd != '.'))
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if dist#vim#IsSafeExecutable('perl', 'perl')
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try
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if &shellxquote != '"'
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let perlpath = system('perl -e "print join(q/,/,@INC)"')
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@ -77,7 +73,6 @@ if !exists("perlpath")
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" current directory and the directory of the current file.
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let perlpath = ".,,"
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endif
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unlet! s:tmp_cwd
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endif
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" Append perlpath to the existing path value, if it is set. Since we don't
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@ -41,16 +41,13 @@ let &l:define='\v(<fn>|<const>|<var>|^\s*\#\s*define)'
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" Safety check: don't execute zig from current directory
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if !exists('g:zig_std_dir') && exists('*json_decode') &&
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\ executable('zig') && get(g:, 'zig_exec', get(g:, 'plugin_exec', 0))
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\ && (fnamemodify(exepath("zig"), ":p:h") != s:tmp_cwd
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\ || (index(split($PATH,has("win32")? ';' : ':'), s:tmp_cwd) != -1 && s:tmp_cwd != '.'))
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\ executable('zig') && dist#vim#IsSafeExecutable('zig', 'zig')
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silent let s:env = system('zig env')
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if v:shell_error == 0
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let g:zig_std_dir = json_decode(s:env)['std_dir']
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endif
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unlet! s:env
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endif
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unlet! s:tmp_cwd
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if exists('g:zig_std_dir')
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let &l:path = g:zig_std_dir . ',' . &l:path
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