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annotate src/create_nvcmdidxs.vim @ 33862:242b964d6269 v9.0.2140

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patch 9.0.2140: [security]: use-after-free in win-enter Commit: https://github.com/vim/vim/commit/eec0c2b3a4cfab93dd8d4adaa60638d47a2bbc8a Author: Christian Brabandt <cb@256bit.org> Date: Tue Nov 28 22:03:48 2023 +0100 patch 9.0.2140: [security]: use-after-free in win-enter Problem: [security]: use-after-free in win-enter Solution: validate window pointer before calling win_enter() win_goto() may stop visual mode, if it is active. However, this may in turn trigger the ModeChanged autocommand, which could potentially free the wp pointer which was valid before now became stale and points to now freed memory. So before calling win_enter(), let's verify one more time, that the wp pointer still points to a valid window structure. Reported by @henices, thanks! Signed-off-by: Christian Brabandt <cb@256bit.org>
author Christian Brabandt <cb@256bit.org>
date Sun, 10 Dec 2023 15:16:01 +0100
parents ee1019e59bef
children
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1 " This script generates the table nv_cmd_idx[] which contains the index in
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2 " nv_cmds[] table (normal.c) for each of the command character supported in
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3 " normal/visual mode.
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4 " This is used to speed up the command lookup in nv_cmds[].
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5 "
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6 " Script should be run using "make nvcmdidxs", every time the nv_cmds[] table
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7 " in src/nv_cmds.h changes.
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8 "
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9 " This is written in legacy Vim script so that it can be run by a slightly
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10 " older Vim version.
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11
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12 " Generate the table of normal/visual mode command characters and their
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13 " corresponding index.
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14 let cmd = 'create_nvcmdidxs'
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15 if has('unix')
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16 let cmd = './' .. cmd
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17 endif
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18 let nv_cmdtbl = systemlist(cmd)->map({i, ch -> {'idx': i, 'cmdchar': ch}})
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20 " sort the table by the command character
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21 call sort(nv_cmdtbl, {a, b -> a.cmdchar - b.cmdchar})
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22
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23 " Compute the highest index upto which the command character can be directly
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24 " used as an index.
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25 let nv_max_linear = 0
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26 for i in range(nv_cmdtbl->len())
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27 if i != nv_cmdtbl[i].cmdchar
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28 let nv_max_linear = i - 1
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29 break
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30 endif
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31 endfor
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32
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33 " Generate a header file with the table
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34 let output =<< trim END
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35 /*
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36 * Automatically generated code by the create_nvcmdidxs.vim script.
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37 *
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38 * Table giving the index in nv_cmds[] to lookup based on
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39 * the command character.
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40 */
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42 // nv_cmd_idx[<normal mode command character>] => nv_cmds[] index
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43 static const unsigned short nv_cmd_idx[] =
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44 {
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45 END
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46
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47 " Add each command character in comment and the corresponding index
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48 let output += nv_cmdtbl->map({_, v ->
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49 \ printf(' /* %5d */ %3d,', v.cmdchar, v.idx)})
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50
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51 let output += ['};', '',
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52 \ '// The highest index for which',
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53 \ '// nv_cmds[idx].cmd_char == nv_cmd_idx[nv_cmds[idx].cmd_char]']
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54
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55 let output += ['static const int nv_max_linear = ' .. nv_max_linear .. ';']
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56
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57 call writefile(output, "nv_cmdidxs.h")
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58 quit
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59
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60 " vim: shiftwidth=2 sts=2 expandtab