On 23 June 2014 23:36, Paul Burton <p...@archlinuxmips.org> wrote:
> Actually no, I don't think you're right about that afterall. The
> argument union itself is never modified. I imagine if it were then it
> would be painful in the case of the semctl syscall where the union is
> passed directly as an argument, rather than as a pointer as it is for
> the ipc syscall.
>
> What may be modified is the data pointed to by the pointers within union
> semun. That is already handled by do_semctl & the translate functions it
> calls.
Except if you look at do_semctl you see code like:
case GETVAL:
case SETVAL:
arg.val = tswap32(target_su.val);
ret = get_errno(semctl(semid, semnum, cmd, arg));
target_su.val = tswap32(arg.val);
break;
which clearly is just modifying fields in the target_semun union.
So something's wrong (probably that code)...
thanks
-- PMM
