Mercurial > vim
view src/create_cmdidxs.vim @ 33096:828bcb1a37e7 v9.0.1833
patch 9.0.1833: [security] runtime file fixes
Commit: https://github.com/vim/vim/commit/816fbcc262687b81fc46f82f7bbeb1453addfe0c
Author: Christian Brabandt <cb@256bit.org>
Date: Thu Aug 31 23:52:30 2023 +0200
patch 9.0.1833: [security] runtime file fixes
Problem: runtime files may execute code in current dir
Solution: only execute, if not run from current directory
The perl, zig and ruby filetype plugins and the zip and gzip autoload
plugins may try to load malicious executable files from the current
working directory. This is especially a problem on windows, where the
current directory is implicitly in your $PATH and windows may even run a
file with the extension `.bat` because of $PATHEXT.
So make sure that we are not trying to execute a file from the current
directory. If this would be the case, error out (for the zip and gzip)
plugins or silently do not run those commands (for the ftplugins).
This assumes, that only the current working directory is bad. For all
other directories, it is assumed that those directories were
intentionally set to the $PATH by the user.
Signed-off-by: Christian Brabandt <cb@256bit.org>
author | Christian Brabandt <cb@256bit.org> |
---|---|
date | Fri, 01 Sep 2023 00:00:02 +0200 |
parents | 72ce5ca82a75 |
children |
line wrap: on
line source
" This script generates the tables cmdidxs1[] and cmdidxs2[][] which, " given a Ex command, determine the first value to probe to find " a matching command in cmdnames[] based on the first character " and the first 2 characters of the command. " This is used to speed up lookup in cmdnames[]. " " Script should be run every time new Ex commands are added in Vim, " from the src/vim directory, since it reads commands from "ex_cmds.h". let cmds = [] let skipped_cmds = 0 let lines = readfile('ex_cmds.h') let idx = 0 while idx < len(lines) let line = lines[idx] if line =~ '^EXCMD(CMD_' let m = matchlist(line, '^EXCMD(CMD_\S*,\s*"\([a-z][^"]*\)"') if len(m) >= 2 let cmds += [ m[1] ] else let skipped_cmds += 1 endif let idx += 1 let flags = lines[idx] let idx += 1 let addr_type = lines[idx] if flags =~ '\<EX_RANGE\>' if addr_type =~ 'ADDR_NONE' echoerr 'ex_cmds.h:' .. (idx - 1) .. ': Using EX_RANGE with ADDR_NONE: ' .. line endif else if addr_type !~ 'ADDR_NONE' echoerr 'ex_cmds.h:' .. (idx - 1) .. ': Missing ADDR_NONE: ' .. line endif endif if flags =~ '\<EX_DFLALL\>' && (addr_type =~ 'ADDR_OTHER' || addr_type =~ 'ADDR_NONE') echoerr 'ex_cmds.h:' .. (idx - 1) .. ': Missing misplaced EX_DFLALL: ' .. line endif endif let idx += 1 endwhile let cmdidxs1 = {} let cmdidxs2 = {} for i in range(len(cmds) - 1, 0, -1) let cmd = cmds[i] let c1 = cmd[0] " First character of command let c2 = cmd[1] " Second character of command (if any) let cmdidxs1{c1} = i if c2 >= 'a' && c2 <= 'z' let cmdidxs2{c1}{c2} = i endif endfor let output = [ '/* Automatically generated code by create_cmdidxs.vim' ] let output += [ ' *' ] let output += [ ' * Table giving the index of the first command in cmdnames[] to lookup' ] let output += [ ' * based on the first letter of a command.' ] let output += [ ' */' ] let output += [ 'static const unsigned short cmdidxs1[26] =' ] let output += [ '{' ] let a_to_z = map(range(char2nr('a'), char2nr('z')), 'nr2char(v:val)') for c1 in a_to_z let line = ' /* ' . c1 . ' */ ' . cmdidxs1{c1} . ((c1 == 'z') ? '' : ',') let output += [ line ] endfor let output += [ '};' ] let output += [ '' ] let output += [ '/*' ] let output += [ ' * Table giving the index of the first command in cmdnames[] to lookup' ] let output += [ ' * based on the first 2 letters of a command.' ] let output += [ ' * Values in cmdidxs2[c1][c2] are relative to cmdidxs1[c1] so that they' ] let output += [ ' * fit in a byte.' ] let output += [ ' */' ] let output += [ 'static const unsigned char cmdidxs2[26][26] =' ] let output += [ '{ /* a b c d e f g h i j k l m n o p q r s t u v w x y z */' ] for c1 in a_to_z let line = ' /* ' . c1 . ' */ {' for c2 in a_to_z if exists('cmdidxs2{c1}{c2}') let line .= printf('%3d', cmdidxs2{c1}{c2} - cmdidxs1{c1}) else let line .= ' 0' endif let line .= (c2 == 'z') ? '' : ',' endfor let line .= ' }' . ((c1 == 'z') ? '' : ',') let output += [ line ] endfor let output += [ '};' ] let output += [ '' ] let output += [ 'static const int command_count = ' . (len(cmds) + skipped_cmds) . ';' ] call writefile(output, "ex_cmdidxs.h") quit