Something wrong with copy_from_user() function - possible false positive due bug in gcc 4.6

Hi.

You my wantto look here

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48880
and
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46639

It is regression in gcc 4.6

Particulry this error happens in binfmt_misc.c file. gcc 4.6 errornously print error in this file.

However I could not find such behavior nowhere in rest of kernel. But it can still be a case If you use gcc 4.6.

If you are using gcc 4.5 or older, it is probably genuine error, or someone is using a destination buffer which is unknown size and gcc cannot prove it is big enaugh to hold data.

Witold Baryluk