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| CodeSonar® 9.2p0 | CONFIDENTIAL | CodeSecure Inc |
A file operation identifies a file by name, but the name string may have been tainted.
| Class Name | Tainted Filename | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mnemonic | IO.TAINT.FNAME | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Categories |
|
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| Availability | Available for C and C++. |
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| Enabling | Checks for this warning class are
disabled by default. To enable them, add the following WARNING_FILTER
rule to the project configuration file.
WARNING_FILTER += allow class="Tainted Filename" |
Japanese (ja)
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
int open_myinfo(void){
int ret;
char filepath[256];
ret = open("/usr/files/info.txt", O_RDONLY);
if (ret >=0 ) return ret;
printf("Could not find info.txt: please enter location");
if (fgets(filepath, 128, stdin)){
ret = open(strcat(filepath, "info.txt"), O_RDONLY); /* 'Tainted Filename' warning issued here */
}
return ret;
}
CodeSonar ships with library models that allow it to recognize a large number of functions that take a file name argument. Some examples are shown in the table below. If one of these functions is called with a potentially-tainted value in the file name parameter position, a warning will be issued.
If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Tainted Filename warnings.
| Functions that can trigger warnings include... | |
|---|---|
| gcc Builtins | __builtin_execl(), __builtin_execv() |
| libc | chmod(), fopen(), stat() |
| Win32 | PathMakeUniqueName(), _stat64(), fopen_s() |
The following configuration file parameters affect checks for this warning class.
To report problems with this documentation, please visit https://support.codesecure.com/.