On 05/21/2016 05:05 PM, Dimitry Sibiryakov wrote:
> Hello, All.
>
> In config_file.cpp I see following piece of code:
>
>> if (PathUtils::isSymLink(tempPath))
>> {
>> // If $(this) is a symlink, expand it.
>> TEXT temp[MAXPATHLEN];
>> const int n = readlink(fileName, temp, sizeof(temp));
>>
>> if (n != -1 && unsigned(n) < sizeof(temp))
>> {
>> tempPath = temp;
> According to man pages, readlink() doesn't terminate string with null.
> Why this
> assignment doesn't crash?
>
Looks like stack use to be zero-initialized. A routine:
void main()
{
char s[255];
int n;
memset(s, 'X', 255);
s[254] = 0;
n = readlink("libfbclient.so", s, 255);
printf("%d %s\n", n, s);
}
prints:
16 libfbclient.so.2XXXXXXXXXXXXXXXXXXXXXXXX...
(as expected)
but if I comment out memset() I always get:
16 libfbclient.so.2
Certainly it's not a reason to keep this unfixed.
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