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A potentially-tainted value is written to a file or other output.
| Class Name | Tainted Write | |||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Mnemonic | IO.TAINT.WRITE | |||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 Write" |
Japanese (ja)
#include <stdio.h>
void do_tainted_write(FILE * src, FILE * dest)
{
putc (getc(src), dest); /* 'Tainted Write' warning issued here */
}
CodeSonar ships with library models that allow it to recognize a large number of functions that write one of their arguments to a file or other output. Some examples are shown in the table below. If one of these functions is called with a potentially-tainted value in the output value 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 Write warnings.
| Functions that can trigger a warning include... | |
|---|---|
| gcc Builtins | __builtin___fprintf_chk(), __builtin_puts() |
| libc | fprintf(), pwrite(), sendmsg() |
| Win32 | fprintf_s(), putwchar(), _write() |
The following configuration file parameters affect checks for this warning class.