Simon 'corecode' Schubert <[EMAIL PROTECTED]> wrote: > [-- text/plain, encoding quoted-printable, charset: UTF-8, 29 lines --] > > Simon 'corecode' Schubert wrote: >> Johannes Hofmann wrote: >>> Hello, >>> >>> I see crashes with a string handling library on DragonFly. >>> The problem can be reduced to the test program below. It crashes on >>> DragonFly when compiled with "gcc -O2 -o foo foo.c". Without -O2 it >>> runs fine. No problems on Linux with or without -O2. >>> Can anyone spot the problem? I think its related to the use of >>> va_copy(). >> >> No, the problem is that gcc uses %ebx after a function call, which it is >> not allowed to do: > [snip] >> Or does the ABI dictate that %ebx needs to be restored? Seems that >> linux/glibc doesn't clobber ebx. > > okay, I am wrong here. %ebx is supposed to be saved and is also being > saved by vsnprinf. gcc is good. > > So this is actually a case of stack smashing. Have fun finding the bug > in vsnprintf or in your code :)
Will have :-). On FreeBSD-6.0 it works ok, so I think I will start from there.... Cheers, Johannes > >> cheers >> simon > > > > [-- application/pgp-signature, encoding 7bit, 9 lines, name: signature.asc --] > [-- Description: OpenPGP digital signature --] >
