Mercurial > vim
view src/vimrun.c @ 33776:9503dc55b5ed v9.0.2108
patch 9.0.2108: [security]: overflow with count for :s command
Commit: https://github.com/vim/vim/commit/ac63787734fda2e294e477af52b3bd601517fa78
Author: Christian Brabandt <cb@256bit.org>
Date: Tue Nov 14 20:45:48 2023 +0100
patch 9.0.2108: [security]: overflow with count for :s command
Problem: [security]: overflow with count for :s command
Solution: Abort the :s command if the count is too large
If the count after the :s command is larger than what fits into a
(signed) long variable, abort with e_value_too_large.
Adds a test with INT_MAX as count and verify it correctly fails.
It seems the return value on Windows using mingw compiler wraps around,
so the initial test using :s/./b/9999999999999999999999999990 doesn't
fail there, since the count is wrapping around several times and finally
is no longer larger than 2147483647. So let's just use 2147483647 in the
test, which hopefully will always cause a failure
Signed-off-by: Christian Brabandt <cb@256bit.org>
author | Christian Brabandt <cb@256bit.org> |
---|---|
date | Thu, 16 Nov 2023 22:15:10 +0100 |
parents | 2559dc02bd64 |
children |
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/* vi:set ts=8 sts=4 sw=4 noet: * * VIM - Vi IMproved by Bram Moolenaar * this file by Vince Negri * * Do ":help uganda" in Vim to read copying and usage conditions. * Do ":help credits" in Vim to see a list of people who contributed. * See README.txt for an overview of the Vim source code. */ /* * vimrun.c - Tiny Win32 program to safely run an external command in a * DOS console. * This program is required to avoid that typing CTRL-C in the DOS * console kills Vim. Now it only kills vimrun. */ #include <stdio.h> #include <stdlib.h> #include <conio.h> #ifndef WIN32_LEAN_AND_MEAN # define WIN32_LEAN_AND_MEAN #endif #include <windows.h> int main(void) { const wchar_t *p; wchar_t *cmd; size_t cmdlen; int retval; int inquote = 0; int silent = 0; HANDLE hstdout; DWORD written; p = (const wchar_t *)GetCommandLineW(); /* * Skip the executable name, which might be in "". */ while (*p) { if (*p == L'"') inquote = !inquote; else if (!inquote && *p == L' ') { ++p; break; } ++p; } while (*p == L' ') ++p; /* * "-s" argument: don't wait for a key hit. */ if (p[0] == L'-' && p[1] == L's' && p[2] == L' ') { silent = 1; p += 3; while (*p == L' ') ++p; } // Print the command, including quotes and redirection. hstdout = GetStdHandle(STD_OUTPUT_HANDLE); WriteConsoleW(hstdout, p, wcslen(p), &written, NULL); WriteConsoleW(hstdout, L"\r\n", 2, &written, NULL); // If the command starts and ends with double quotes, // Enclose the command in parentheses. cmd = NULL; cmdlen = wcslen(p); if (cmdlen >= 2 && p[0] == L'"' && p[cmdlen - 1] == L'"') { cmdlen += 3; cmd = malloc(cmdlen * sizeof(wchar_t)); if (cmd == NULL) { perror("vimrun malloc(): "); return -1; } _snwprintf(cmd, cmdlen, L"(%s)", p); p = cmd; } /* * Do it! */ retval = _wsystem(p); if (cmd) free(cmd); if (retval == -1) perror("vimrun system(): "); else if (retval != 0) printf("shell returned %d\n", retval); if (!silent) { puts("Hit any key to close this window..."); while (_kbhit()) (void)_getch(); (void)_getch(); } return retval; }