>>>>> "Richard" == Richard B Johnson <root@chaos.analogic.com> writes:
Richard> On Tue, 14 Jan 2003, DervishD wrote:
>> Hi Richard :)
>>
>>>> Any header where I can see the length for argv[0] or is this SOME
>>>> kind of unoficial standard? Just doing strcpy seems dangerous to
>>>> me (you can read 'paranoid'...).
>> They need to have space for _POSIX_PATH_MAX (512 bytes), to claim POSIX
>> compatibility so any POSIX system will have at least 512 bytes
>> available because the pathname of the executable normally goes
>> there.
No, because argv[0] is followed immediately by a NUL then argv[1],
then argv[2], etc. They're not fixed length strings -- the kernel
allocates just enough for the actual arguments, rounded up to
PAGESIZE.
So if you copy more than strlen(argv[0]), you'll start overwriting
argv[1].
-- Dr Peter Chubb peterc@gelato.unsw.edu.au You are lost in a maze of BitKeeper repositories, all almost the same. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Wed Jan 15 2003 - 22:00:52 EST