Messages in this thread | | | Date | Sat, 24 May 2008 01:17:54 -0700 | From | Chris Wright <> | Subject | Re: capget() overflows buffers. |
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* Andrew G. Morgan (morgan@kernel.org) wrote: > Chris Wright wrote: > | Hmm, it would be kind of nice to have a formalized way get the size, > | perhaps it would help with KaiGai's request for caps printed out. > | Something that tells us either the number of u32s, or the max bit > | supported? > > Serge has already provided one with the call, > > ~ sys_prctl(PR_CAPBSET_READ, x); > > returns -EINVAL if (x > max-supported-capability). > > (Ref: 3b7391de67da515c91f48aa371de77cb6cc5c07e)
Yeah, that's a little roundabout..
> Just to be clear, you are not referring to a warning that the > application is stuck in a 32-bit capability world, because we already > have one of those: warn_legacy_capability_use(). You are referring to a > warning that might indicate a problem with code like that given in your > example - in which case I'll respond to that part of the thread...
Yes, like the one in the patch I sent that added a warn_broken_capability_use().
thanks, -chris
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