Do not enable CONFIG_IO_STRICT_DEVMEM by default

Larry Finger reports: "My PowerBook G4 Aluminum with a 32-bit PPC processor fails to boot for the 4.4-git series". This is likely due to X still needing /dev/mem access on this platform. CONFIG_IO_STRICT_DEVMEM is not yet safe to turn on when CONFIG_STRICT_DEVMEM=y. Remove the default so that old configurations do not change behavior. Fixes: 90a545e ("restrict /dev/mem to idle io memory ranges") Reported-by: Larry Finger <[email protected]> Tested-by: Larry Finger <[email protected]> Link: http://marc.info/?l=linux-kernel&m=145332012023825&w=2 Acked-by: Kees Cook <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Russell King <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Signed-off-by: Dan Williams <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
zubinmehta · Jan 21, 2016 · 19a3dd7 · 19a3dd7
1 parent 9fa6860
commit 19a3dd7
Showing 1 changed file with 0 additions and 1 deletion.
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
@@ -1919,7 +1919,6 @@ config STRICT_DEVMEM
 config IO_STRICT_DEVMEM
 	bool "Filter I/O access to /dev/mem"
 	depends on STRICT_DEVMEM
-	default STRICT_DEVMEM
 	---help---
 	  If this option is disabled, you allow userspace (root) access to all
 	  io-memory regardless of whether a driver is actively using that