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Look into fixing CVE-2021-28927

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This commit is contained in:
mudlord 2021-05-16 17:55:14 +10:00
parent 3187c87451
commit 67b180d63d
1 changed files with 23 additions and 6 deletions
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29
frontend/drivers/platform_win32.c
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@ -1011,13 +1011,13 @@ static bool is_narrator_running_windows(void)
static bool accessibility_speak_windows(int speed,
const char* speak_text, int priority)
{
char cmd[1200];
char *cmd = NULL;
const char *voice = get_user_language_iso639_1(true);
const char *language = accessibility_win_language_code(voice);
const char *langid = accessibility_win_language_id(voice);
bool res = false;
const char* speeds[10] = {"-10", "-7.5", "-5", "-2.5", "0", "2", "4", "6", "8", "10"};
size_t nbytes_cmd = 0;
if (speed < 1)
speed = 1;
else if (speed > 10)
@ -1035,15 +1035,32 @@ static bool accessibility_speak_windows(int speed,
if (USE_POWERSHELL)
{
if (strlen(language) > 0)
snprintf(cmd, sizeof(cmd),
"powershell.exe -NoProfile -WindowStyle Hidden -Command \"Add-Type -AssemblyName System.Speech; $synth = New-Object System.Speech.Synthesis.SpeechSynthesizer; $synth.SelectVoice(\\\"%s\\\"); $synth.Rate = %s; $synth.Speak(\\\"%s\\\");\"", language, speeds[speed-1], (char*) speak_text);
{
nbytes_cmd = snprintf(NULL, 0,
"powershell.exe -NoProfile -WindowStyle Hidden -Command \"Add-Type -AssemblyName System.Speech; $synth = New-Object System.Speech.Synthesis.SpeechSynthesizer; $synth.SelectVoice(\\\"%s\\\"); $synth.Rate = %s; $synth.Speak(\\\"%s\\\");\"", language, speeds[speed-1], (char*) speak_text) + 1;
cmd = malloc(nbytes_cmd);
snprintf(cmd, nbytes_cmd,
"powershell.exe -NoProfile -WindowStyle Hidden -Command \"Add-Type -AssemblyName System.Speech; $synth = New-Object System.Speech.Synthesis.SpeechSynthesizer; $synth.SelectVoice(\\\"%s\\\"); $synth.Rate = %s; $synth.Speak(\\\"%s\\\");\"", language, speeds[speed-1], (char*) speak_text);
}
else
snprintf(cmd, sizeof(cmd),
"powershell.exe -NoProfile -WindowStyle Hidden -Command \"Add-Type -AssemblyName System.Speech; $synth = New-Object System.Speech.Synthesis.SpeechSynthesizer; $synth.Rate = %s; $synth.Speak(\\\"%s\\\");\"", speeds[speed-1], (char*) speak_text);
{
nbytes_cmd = snprintf(NULL, 0,
"powershell.exe -NoProfile -WindowStyle Hidden -Command \"Add-Type -AssemblyName System.Speech; $synth = New-Object System.Speech.Synthesis.SpeechSynthesizer; $synth.Rate = %s; $synth.Speak(\\\"%s\\\");\"", speeds[speed-1], (char*) speak_text);
cmd = malloc(nbytes_cmd);
snprintf(cmd, nbytes_cmd,
"powershell.exe -NoProfile -WindowStyle Hidden -Command \"Add-Type -AssemblyName System.Speech; $synth = New-Object System.Speech.Synthesis.SpeechSynthesizer; $synth.Rate = %s; $synth.Speak(\\\"%s\\\");\"", speeds[speed-1], (char*) speak_text);
}
if (pi_set)
terminate_win32_process(g_pi);
res = create_win32_process(cmd);
free(cmd);
cmd = NULL;
if (!res)
{
pi_set = false;