Re: How to lock current->signal->tty

From: Jes Sorensen
Date: Wed Aug 09 2006 - 04:07:24 EST

>>>>> "Alan" == Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> writes:

Alan> Ar Maw, 2006-08-08 am 09:41 -0700, ysgrifennodd Luck, Tony:
>> unaligned accesses at all is rather controversial. So its a 50-50
>> shot whether I'll fix it by adding the mutex_lock/mutex_unlock
>> around the use of current->signal->tty, or just rip this out and
>> just leave the printk().

Alan> Personally I'd just rip it out full stop. Its trivial to use
Alan> kprobes and friends to audit such things if there is a
Alan> performance concern.

Personally I don't like the current approach. However, I believe the
philosophy behind it is that users rarely look in dmesg and they
should be notified (and beaten with a stick) when their badly written
app spawns unaligned accesses which end up being emulated by the

These messages are normally caused by userland code, so kprobes
probably wont do much good :)

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