From 19a3dd7621af01b7e44a70d16beab59326c38824 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 20 Jan 2016 14:37:22 -0800 Subject: [PATCH] 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: 90a545e98126 ("restrict /dev/mem to idle io memory ranges") Reported-by: Larry Finger Tested-by: Larry Finger Link: http://marc.info/?l=linux-kernel&m=145332012023825&w=2 Acked-by: Kees Cook Cc: Arnd Bergmann Cc: Ingo Molnar Cc: Russell King Cc: Andrew Morton Cc: Greg Kroah-Hartman Signed-off-by: Dan Williams Signed-off-by: Linus Torvalds --- lib/Kconfig.debug | 1 - 1 file changed, 1 deletion(-) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index f75a33f29f6e..7d0b49c536c5 100644 --- 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