An in-kernel file loading interface

Posted Feb 21, 2016 11:54 UTC (Sun) by anselm (subscriber, #2796)
In reply to: An in-kernel file loading interface by PaXTeam
Parent article: An in-kernel file loading interface

Makes sense to me (thank you for the clarification).

The important point as far as I'm concerned is that the kernel doesn't “read” a large executable into memory in its entirety before it is started, but maps it into memory and fetches pages from the file as required according to page faults arising from running the code.

An in-kernel file loading interface

Posted Feb 21, 2016 13:29 UTC (Sun) by PaXTeam (guest, #24616) [Link]

yes, that's how it works for userland maps however note that kernel_read has other uses such as the module loader which does read in the entire module file (finit_module->copy_module_from_fd->kernel_read).