Messages in this thread | | | Subject | Re: [PATCH] Smackv10: Smack rules grammar + their stateful parser | From | Tetsuo Handa <> | Date | Tue, 6 Nov 2007 06:56:43 +0900 |
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Linus Torvalds wrote: > I personally think string parsers are *much* better than the alternatives > (which basically boil down to nasty binary interfaces) Me too.
> Binary structures and ioctl's are *much* worse. They are totally > undebuggable with generic tools (think "echo" or "strace"), and they are a > total nightmare to parse across architectures and pointer sizes. Not only pointer sizes bugs, but also checking pointer address costs. For binary policy, we have to examine ->next pointer is valid or not. We can't blindly use address supplied from userland.
I have encountered mismatch of kernel version and AppArmor's policy parser version when I just updated only kernel. As a result, the segmentation faults rushed toward me. From this experience, TOMOYO still uses string parser in the kernel. If a parser doesn't consume much stack (i.e. call functions recursively), I think it is no problem.
Thanks.
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