Re: [Full-disclosure] Python 2.5 (Modules/zlib) minigzip local buffer overflow vulnerability

[Ulf Harnhammar <metaur@xxxxxxxxx>]

> Using strncpy is just strcpy + strlen
> anyway it can't have a big speed impact or anything.

That's not really true. If you check the Linux manpage for strncpy(3),
it says:

       char *strncpy(char *dest, const char *src, size_t n);
[blah]
       In the case where the length of src is less than that of n, the remain-
       der of dest will be padded with null bytes.

"The C Programming Language" agrees:

"Pad with '\0's if t has fewer than n characters."

Thus, replacing strcpy(3) calls with strncpy(3) can have definite 
impacts on performance.

Regards, Ulf Harnhammar

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/