On Tue, Jun 28, 2016 at 2:05 PM, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> wrote: > On Tue, Jun 28 2016, Emese Revfy <re.emese@xxxxxxxxx> wrote: > >> The kernel already has a mechanism to free up code and data memory that >> is only used during kernel or module initialization. >> This plugin will teach the compiler to find more such code and data that >> can be freed after initialization. >> It has two passes. The first one tries to find all functions that >> can be become __init/__exit. The second one moves string constants >> (local variables and function string arguments marked by >> the nocapture attribute) only referenced in __init/__exit functions >> to the __initconst/__exitconst sections. >> It reduces memory usage. This plugin can be useful for embedded systems. > > May I suggest, as a followup patch, a debug option/plugin parameter to > put the strings in a section which will not be reaped after init, but > just marked inaccessible, with graceful handling of bad accesses (print > a big fat warning, make the page(s) readable, continue)? Is there a clean way to do this that isn't arch-specific? -Kees -- Kees Cook Chrome OS & Brillo Security -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
