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

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
......@@ -24,6 +24,9 @@ config KEXEC_ELF
config HAVE_IMA_KEXEC
bool
config SET_FS
bool
config HOTPLUG_SMT
bool
......
......@@ -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,
......
......@@ -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
......
......@@ -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.
......
......@@ -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
......
......@@ -22,6 +22,7 @@ config C6X
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
select MMU_GATHER_NO_RANGE if MMU
select SET_FS
config MMU
def_bool n
......
......@@ -78,6 +78,7 @@ config CSKY
select PCI_DOMAINS_GENERIC if PCI
select PCI_SYSCALL if PCI
select PCI_MSI if PCI
select SET_FS
config LOCKDEP_SUPPORT
def_bool y
......
......@@ -25,6 +25,7 @@ config H8300
select HAVE_ARCH_KGDB
select HAVE_ARCH_HASH
select CPU_NO_EFFICIENT_FFS
select SET_FS
select UACCESS_MEMCPY
config CPU_BIG_ENDIAN
......
......@@ -31,6 +31,7 @@ config HEXAGON
select GENERIC_CLOCKEVENTS_BROADCAST
select MODULES_USE_ELF_RELA
select GENERIC_CPU_DEVICES
select SET_FS
help
Qualcomm Hexagon is a processor architecture designed for high
performance and low power across a wide variety of applications.
......
......@@ -56,6 +56,7 @@ config IA64
select NEED_DMA_MAP_STATE
select NEED_SG_DMA_LENGTH
select NUMA if !FLATMEM
select SET_FS
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
......
......@@ -32,6 +32,7 @@ config M68K
select OLD_SIGSUSPEND3
select OLD_SIGACTION
select MMU_GATHER_NO_RANGE if MMU
select SET_FS
config CPU_BIG_ENDIAN
def_bool y
......
......@@ -46,6 +46,7 @@ config MICROBLAZE
select CPU_NO_EFFICIENT_FFS
select MMU_GATHER_NO_RANGE if MMU
select SPARSE_IRQ
select SET_FS
# Endianness selection
choice
......
......@@ -87,6 +87,7 @@ config MIPS
select MODULES_USE_ELF_RELA if MODULES && 64BIT
select PERF_USE_VMALLOC
select RTC_LIB
select SET_FS
select SYSCTL_EXCEPTION_TRACE
select VIRT_TO_BUS
......
......@@ -48,6 +48,7 @@ config NDS32
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
select SET_FS
help
Andes(nds32) Linux support.
......
......@@ -27,6 +27,7 @@ config NIOS2
select USB_ARCH_HAS_HCD if USB_SUPPORT
select CPU_NO_EFFICIENT_FFS
select MMU_GATHER_NO_RANGE if MMU
select SET_FS
config GENERIC_CSUM
def_bool y
......
......@@ -39,6 +39,7 @@ config OPENRISC
select ARCH_WANT_FRAME_POINTERS
select GENERIC_IRQ_MULTI_HANDLER
select MMU_GATHER_NO_RANGE if MMU
select SET_FS
config CPU_BIG_ENDIAN
def_bool y
......
......@@ -63,6 +63,7 @@ config PARISC
select HAVE_FTRACE_MCOUNT_RECORD if HAVE_DYNAMIC_FTRACE
select HAVE_KPROBES_ON_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_REGS
select SET_FS
help
The PA-RISC microprocessor is designed by Hewlett-Packard and used
......
......@@ -249,6 +249,7 @@ config PPC
select PCI_SYSCALL if PCI
select PPC_DAWR if PPC64
select RTC_LIB
select SET_FS
select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
select THREAD_INFO_IN_TASK
......
......@@ -86,6 +86,7 @@ config RISCV
select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
select THREAD_INFO_IN_TASK
select SET_FS
config ARCH_MMAP_RND_BITS_MIN
default 18 if 64BIT
......
......@@ -185,6 +185,7 @@ config S390
select OLD_SIGSUSPEND3
select PCI_DOMAINS if PCI
select PCI_MSI if PCI
select SET_FS
select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
select THREAD_INFO_IN_TASK
......
......@@ -71,6 +71,7 @@ config SUPERH
select PERF_EVENTS
select PERF_USE_VMALLOC
select RTC_LIB
select SET_FS
select SPARSE_IRQ
help
The SuperH is a RISC processor targeted for use in embedded systems
......
......@@ -49,6 +49,7 @@ config SPARC
select LOCKDEP_SMALL if LOCKDEP
select NEED_DMA_MAP_STATE
select NEED_SG_DMA_LENGTH
select SET_FS
config SPARC32
def_bool !64BIT
......
......@@ -19,6 +19,7 @@ config UML
select GENERIC_CPU_DEVICES
select GENERIC_CLOCKEVENTS
select HAVE_GCC_PLUGINS
select SET_FS
select TTY # Needed for line.c
config MMU
......
......@@ -237,6 +237,7 @@ config X86
select HAVE_ARCH_KCSAN if X86_64
select X86_FEATURE_NAMES if PROC_FS
select PROC_PID_ARCH_STATUS if PROC_FS
select SET_FS
imply IMA_SECURE_AND_OR_TRUSTED_BOOT if EFI
config INSTRUCTION_DECODER
......
......@@ -41,6 +41,7 @@ config XTENSA
select IRQ_DOMAIN
select MODULES_USE_ELF_RELA
select PERF_USE_VMALLOC
select SET_FS
select VIRT_TO_BUS
help
Xtensa processors are 32-bit RISC machines designed by Tensilica
......
......@@ -8,6 +8,7 @@
#include <asm/uaccess.h>
#ifdef CONFIG_SET_FS
/*
* Force the uaccess routines to be wired up for actual userspace access,
* overriding any possible set_fs(KERNEL_DS) still lingering around. Undone
......@@ -25,6 +26,23 @@ static inline void force_uaccess_end(mm_segment_t oldfs)
{
set_fs(oldfs);
}
#else /* CONFIG_SET_FS */
typedef struct {
/* empty dummy */
} mm_segment_t;
#define uaccess_kernel() (false)
#define user_addr_max() (TASK_SIZE_MAX)
static inline mm_segment_t force_uaccess_begin(void)
{
return (mm_segment_t) { };
}
static inline void force_uaccess_end(mm_segment_t oldfs)
{
}
#endif /* CONFIG_SET_FS */
/*
* Architectures should provide two primitives (raw_copy_{to,from}_user())
......
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