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Ensure null-termination in str_escape

Browse source 
This also fixes a couple of potential buffer overflows. The affected
code is still buggy (doesn't do the right thing on potential buffer
overflow), but at least it won't result in crashes/out of bound writes
anymore.
This commit is contained in:
heinrich5991 2017-07-08 13:06:03 +02:00
parent 33927f6397
commit 409bc0e019
6 changed files with 22 additions and 24 deletions
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10
src/base/system.c
View file

@ -2241,12 +2241,18 @@ void str_timestamp(char *buffer, int buffer_size)
void str_escape(char **dst, const char *src, const char *end)
{
while(*src && *dst < end)
while(*src && *dst + 1 < end)
{
if(*src == '"' || *src == '\\') // escape \ and "
*(*dst)++ = '\\';
{
if(*dst + 2 < end)
*(*dst)++ = '\\';
else
break;
}
*(*dst)++ = *src++;
}
**dst = 0;
}
int mem_comp(const void *a, const void *b, int size)

3
src/base/system.h
View file

@ -1063,7 +1063,8 @@ void str_timestamp_ex(time_t time, char *buffer, int buffer_size, const char *fo
Escapes \ and " characters in a string.
Parameters:
dst - Destination array pointer, gets increased
dst - Destination array pointer, gets increased, will point to
the terminating null.
src - Source array
end - End of destination array
*/

13
src/engine/client/friends.cpp
View file

@ -167,16 +167,13 @@ void CFriends::ConfigSaveCallback(IConfig *pConfig, void *pUserData)
{
str_copy(aBuf, pSelf->m_Foes ? "add_foe " : "add_friend ", sizeof(aBuf));
char *pDst = aBuf+str_length(aBuf);
*pDst++ = '"';
str_append(aBuf, "\"", sizeof(aBuf));
char *pDst = aBuf + str_length(aBuf);
str_escape(&pDst, pSelf->m_aFriends[i].m_aName, pEnd);
*pDst++ = '"';
*pDst++ = ' ';
*pDst++ = '"';
str_append(aBuf, "\" \"", sizeof(aBuf));
pDst = aBuf + str_length(aBuf);
str_escape(&pDst, pSelf->m_aFriends[i].m_aClan, pEnd);
*pDst++ = '"';
*pDst++ = 0;
str_append(aBuf, "\"", sizeof(aBuf));
pConfig->WriteLine(aBuf);
}

5
src/engine/shared/config.cpp
View file

@ -26,10 +26,9 @@ class CConfig : public IConfig
CCallback m_aCallbacks[MAX_CALLBACKS];
int m_NumCallbacks;
void EscapeParam(char *pDst, const char *pSrc, int size)
void EscapeParam(char *pDst, const char *pSrc, int Size)
{
str_escape(&pDst, pSrc, pDst + size);
*pDst = 0;
str_escape(&pDst, pSrc, pDst + Size);
}
public:

7
src/engine/shared/console.cpp
View file

@ -738,13 +738,10 @@ void CConsole::ConToggle(IConsole::IResult *pResult, void *pUser)
{
CStrVariableData *pData = static_cast<CStrVariableData *>(pUserData);
const char *pStr = !str_comp(pData->m_pStr, pResult->GetString(1)) ? pResult->GetString(2) : pResult->GetString(1);
str_copy(aBuf, pResult->GetString(0), sizeof(aBuf));
str_format(aBuf, sizeof(aBuf), "%s \"", pResult->GetString(0));
char *pDst = aBuf + str_length(aBuf);
*pDst++ = ' ';
*pDst++ = '"';
str_escape(&pDst, pStr, aBuf + sizeof(aBuf));
*pDst++ = '"';
*pDst++ = 0;
str_append(aBuf, "\"", sizeof(aBuf));
pConsole->ExecuteLine(aBuf);
aBuf[0] = 0;
}

8
src/game/client/components/binds.cpp
View file

@ -293,20 +293,18 @@ void CBinds::ConfigSaveCallback(IConfig *pConfig, void *pUserData)
CBinds *pSelf = (CBinds *)pUserData;
char aBuffer[256];
char *pEnd = aBuffer+sizeof(aBuffer)-8;
char *pEnd = aBuffer+sizeof(aBuffer);
pConfig->WriteLine("unbindall");
for(int i = 0; i < KEY_LAST; i++)
{
if(!pSelf->m_apKeyBindings[i])
continue;
str_format(aBuffer, sizeof(aBuffer), "bind %s ", pSelf->Input()->KeyName(i));
str_format(aBuffer, sizeof(aBuffer), "bind %s \"", pSelf->Input()->KeyName(i));
// process the string. we need to escape some characters
char *pDst = aBuffer + str_length(aBuffer);
*pDst++ = '"';
str_escape(&pDst, pSelf->m_apKeyBindings[i], pEnd);
*pDst++ = '"';
*pDst++ = 0;
str_append(aBuffer, "\"", sizeof(aBuffer));
pConfig->WriteLine(aBuffer);
}