Commit 5e6e9852 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

uaccess: add infrastructure for kernel builds with set_fs() 



Add a CONFIG_SET_FS option that is selected by architecturess that
implement set_fs, which is all of them initially.  If the option is not
set stubs for routines related to overriding the address space are
provided so that architectures can start to opt out of providing set_fs.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 36e2c742

arch/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -24,6 +24,9 @@ config KEXEC_ELF 
config HAVE_IMA_KEXEC

	bool



config SET_FS

	bool



config HOTPLUG_SMT

	bool

arch/alpha/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ config ALPHA 
	select OLD_SIGSUSPEND

	select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67

	select MMU_GATHER_NO_RANGE

	select SET_FS

	help

	  The Alpha is a 64-bit general-purpose processor designed and

	  marketed by the Digital Equipment Corporation of blessed memory,

arch/arc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ config ARC 
	select PCI_SYSCALL if PCI

	select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING

	select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32

	select SET_FS



config ARCH_HAS_CACHE_LINE_SIZE

	def_bool y

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -118,6 +118,7 @@ config ARM 
	select PCI_SYSCALL if PCI

	select PERF_USE_VMALLOC

	select RTC_LIB

	select SET_FS

	select SYS_SUPPORTS_APM_EMULATION

	# Above selects are sorted alphabetically; please add new ones

	# according to that.  Thanks.

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -192,6 +192,7 @@ config ARM64 
	select PCI_SYSCALL if PCI

	select POWER_RESET

	select POWER_SUPPLY

	select SET_FS

	select SPARSE_IRQ

	select SWIOTLB

	select SYSCTL_EXCEPTION_TRACE

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