Messages in this thread | | | Subject | Re: [PATCH 1/2] vsprintf/sysctl: Bugfix, neaten and document %pK usages | From | Joe Perches <> | Date | Thu, 10 Oct 2013 22:58:35 -0700 |
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On Fri, 2013-10-11 at 16:49 +1100, Ryan Mallon wrote:
> It doesn't matter what the value of kptr_restrict happens to be, the > code is still broken. So, with your patch, values 0 and 2 of > kptr_restrict will print a seemingly correct value, but when > kptr_restrict is 1 then it will print 'pK-error'.
I think it's _wrong_ to break existing code.
And no, 0 and 2 will print "correct" values.
Only the relatively uncommon 1 use case is broken. kptr_restrict is simply broken relative to interrupts.
%pK is used outside of seq and goes to dmesg too btw. You can't simply check the process permissions at open.
> It should print 'pK-error' in all cases, so that any bugs where %pK is > being used from interrupt content are identified regardless of the > setting of kptr_restrict. > > Anyway, with the approach that Eric and George suggested, this would > become a non-issue. So probably just best to leave the code as is.
Or do as I did and shrink it and make it clearer until your use cases might be implemented.
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