Messages in this thread | | | From | Clemens Kolbitsch <> | Subject | Copy large memory regions from & to userspace | Date | Fri, 31 Aug 2007 00:29:20 +0200 |
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Hi! Just a short question: What is the correct method of copying large areas of memory from userspace into userspace when running in kernel-mode?
According to just about any type of documentation out there something like
unsigned long *from = 0x08000000; unsigned long *to = 0x09000000; memcpy(to, from, 0x1000);
should be avoided as copy_from_user, put_user, etc. should be used instead...
Is there a third set of functions for direct from-userspace-to-userspace copying or is it legitimate to assure that the first bytes in the from & to memory areas are available and then just do the plain memcpy?
Maybe there is a simple "just use the xxx function-set" answer to that, that i just have not ran into yet :-)
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