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uaccess: remove CONFIG_SET_FS

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There are no remaining callers of set_fs(), so CONFIG_SET_FS
can be removed globally, along with the thread_info field and
any references to it.

This turns access_ok() into a cheaper check against TASK_SIZE_MAX.

As CONFIG_SET_FS is now gone, drop all remaining references to
set_fs()/get_fs(), mm_segment_t, user_addr_max() and uaccess_kernel().

Acked-by: Sam Ravnborg <sam@ravnborg.org> # for sparc32 changes
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Tested-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com> # for arc changes
Acked-by: Stafford Horne <shorne@gmail.com> # [openrisc, asm-generic]
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
2022-02-11 21:42:45 +01:00
parent e5ef21d139
commit 967747bbc0
76 changed files with 14 additions and 531 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/Kconfig
View File

@@ -24,9 +24,6 @@ config KEXEC_ELF
config HAVE_IMA_KEXEC
bool
config SET_FS
bool
config HOTPLUG_SMT
bool

1
arch/alpha/Kconfig
View File

@@ -35,7 +35,6 @@ config ALPHA
select OLD_SIGSUSPEND
select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
select MMU_GATHER_NO_RANGE
select SET_FS
select SPARSEMEM_EXTREME if SPARSEMEM
select ZONE_DMA
help

4
arch/alpha/include/asm/processor.h
View File

@@ -26,10 +26,6 @@
#define TASK_UNMAPPED_BASE \
((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
typedef struct {
unsigned long seg;
} mm_segment_t;
/* This is dead. Everything has been moved to thread_info. */
struct thread_struct { };
#define INIT_THREAD { }

2
arch/alpha/include/asm/thread_info.h
View File

@@ -19,7 +19,6 @@ struct thread_info {
unsigned int flags; /* low level flags */
unsigned int ieee_state; /* see fpu.h */
mm_segment_t addr_limit; /* thread address space */
unsigned cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
unsigned int status; /* thread-synchronous flags */
@@ -35,7 +34,6 @@ struct thread_info {
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.addr_limit = KERNEL_DS, \
.preempt_count = INIT_PREEMPT_COUNT, \
}

19
arch/alpha/include/asm/uaccess.h
View File

@@ -2,26 +2,7 @@
#ifndef __ALPHA_UACCESS_H
#define __ALPHA_UACCESS_H
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* Or at least it did once upon a time. Nowadays it is a mask that
* defines which bits of the address space are off limits. This is a
* wee bit faster than the above.
*
* For historical reasons, these macros are grossly misnamed.
*/
#define KERNEL_DS ((mm_segment_t) { 0UL })
#define USER_DS ((mm_segment_t) { -0x40000000000UL })
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#include <asm-generic/access_ok.h>
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.

1
arch/arc/Kconfig
View File

@@ -45,7 +45,6 @@ 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
select TRACE_IRQFLAGS_SUPPORT
config LOCKDEP_SUPPORT

20
arch/arc/include/asm/segment.h
View File

@@ -1,20 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*/
#ifndef __ASMARC_SEGMENT_H
#define __ASMARC_SEGMENT_H
#ifndef __ASSEMBLY__
typedef unsigned long mm_segment_t;
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(0)
#define USER_DS MAKE_MM_SEG(TASK_SIZE)
#define uaccess_kernel() (get_fs() == KERNEL_DS)
#endif /* __ASSEMBLY__ */
#endif /* __ASMARC_SEGMENT_H */

3
arch/arc/include/asm/thread_info.h
View File

@@ -27,7 +27,6 @@
#ifndef __ASSEMBLY__
#include <linux/thread_info.h>
#include <asm/segment.h>
/*
* low level task data that entry.S needs immediate access to
@@ -40,7 +39,6 @@ struct thread_info {
unsigned long flags; /* low level flags */
int preempt_count; /* 0 => preemptable, <0 => BUG */
struct task_struct *task; /* main task structure */
mm_segment_t addr_limit; /* thread address space */
__u32 cpu; /* current CPU */
unsigned long thr_ptr; /* TLS ptr */
};
@@ -56,7 +54,6 @@ struct thread_info {
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
.addr_limit = KERNEL_DS, \
}
static inline __attribute_const__ struct thread_info *current_thread_info(void)

1
arch/arc/include/asm/uaccess.h
View File

@@ -638,7 +638,6 @@ extern unsigned long arc_clear_user_noinline(void __user *to,
#define __clear_user(d, n) arc_clear_user_noinline(d, n)
#endif
#include <asm/segment.h>
#include <asm-generic/uaccess.h>
#endif

10
arch/arm/lib/uaccess_with_memcpy.c
View File

@@ -92,11 +92,6 @@ __copy_to_user_memcpy(void __user *to, const void *from, unsigned long n)
unsigned long ua_flags;
int atomic;
if (uaccess_kernel()) {
memcpy((void *)to, from, n);
return 0;
}
/* the mmap semaphore is taken only if not in an atomic context */
atomic = faulthandler_disabled();
@@ -165,11 +160,6 @@ __clear_user_memset(void __user *addr, unsigned long n)
{
unsigned long ua_flags;
if (uaccess_kernel()) {
memset((void *)addr, 0, n);
return 0;
}
mmap_read_lock(current->mm);
while (n) {
pte_t *pte;

2
arch/arm64/kernel/traps.c
View File

@@ -519,7 +519,7 @@ void do_ptrauth_fault(struct pt_regs *regs, unsigned int esr)
NOKPROBE_SYMBOL(do_ptrauth_fault);
#define __user_cache_maint(insn, address, res) \
if (address >= user_addr_max()) { \
if (address >= TASK_SIZE_MAX) { \
res = -EFAULT; \
} else { \
uaccess_ttbr0_enable(); \

1
arch/csky/Kconfig
View File

@@ -79,7 +79,6 @@ config CSKY
select PCI_DOMAINS_GENERIC if PCI
select PCI_SYSCALL if PCI
select PCI_MSI if PCI
select SET_FS
select TRACE_IRQFLAGS_SUPPORT
config LOCKDEP_SUPPORT

2
arch/csky/include/asm/processor.h
View File

@@ -4,7 +4,6 @@
#define __ASM_CSKY_PROCESSOR_H
#include <linux/bitops.h>
#include <asm/segment.h>
#include <asm/ptrace.h>
#include <asm/current.h>
#include <asm/cache.h>
@@ -59,7 +58,6 @@ struct thread_struct {
*/
#define start_thread(_regs, _pc, _usp) \
do { \
set_fs(USER_DS); /* reads from user space */ \
(_regs)->pc = (_pc); \
(_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \
(_regs)->regs[2] = 0; \

10
arch/csky/include/asm/segment.h
View File

@@ -1,10 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_CSKY_SEGMENT_H
#define __ASM_CSKY_SEGMENT_H
typedef struct {
unsigned long seg;
} mm_segment_t;
#endif /* __ASM_CSKY_SEGMENT_H */

2
arch/csky/include/asm/thread_info.h
View File

@@ -16,7 +16,6 @@ struct thread_info {
unsigned long flags;
int preempt_count;
unsigned long tp_value;
mm_segment_t addr_limit;
struct restart_block restart_block;
struct pt_regs *regs;
unsigned int cpu;
@@ -26,7 +25,6 @@ struct thread_info {
{ \
.task = &tsk, \
.preempt_count = INIT_PREEMPT_COUNT, \
.addr_limit = KERNEL_DS, \
.cpu = 0, \
.restart_block = { \
.fn = do_no_restart_syscall, \

3
arch/csky/include/asm/uaccess.h
View File

@@ -3,8 +3,6 @@
#ifndef __ASM_CSKY_UACCESS_H
#define __ASM_CSKY_UACCESS_H
#define user_addr_max() (current_thread_info()->addr_limit.seg)
/*
* __put_user_fn
*/
@@ -200,7 +198,6 @@ unsigned long raw_copy_to_user(void *to, const void *from, unsigned long n);
unsigned long __clear_user(void __user *to, unsigned long n);
#define __clear_user __clear_user
#include <asm/segment.h>
#include <asm-generic/uaccess.h>
#endif /* __ASM_CSKY_UACCESS_H */

1
arch/csky/kernel/asm-offsets.c
View File

@@ -25,7 +25,6 @@ int main(void)
/* offsets into the thread_info struct */
DEFINE(TINFO_FLAGS, offsetof(struct thread_info, flags));
DEFINE(TINFO_PREEMPT, offsetof(struct thread_info, preempt_count));
DEFINE(TINFO_ADDR_LIMIT, offsetof(struct thread_info, addr_limit));
DEFINE(TINFO_TP_VALUE, offsetof(struct thread_info, tp_value));
DEFINE(TINFO_TASK, offsetof(struct thread_info, task));

1
arch/h8300/Kconfig
View File

@@ -24,7 +24,6 @@ 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

1
arch/h8300/include/asm/processor.h
View File

@@ -13,7 +13,6 @@
#define __ASM_H8300_PROCESSOR_H
#include <linux/compiler.h>
#include <asm/segment.h>
#include <asm/ptrace.h>
#include <asm/current.h>

40
arch/h8300/include/asm/segment.h
View File

@@ -1,40 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _H8300_SEGMENT_H
#define _H8300_SEGMENT_H
/* define constants */
#define USER_DATA (1)
#ifndef __USER_DS
#define __USER_DS (USER_DATA)
#endif
#define USER_PROGRAM (2)
#define SUPER_DATA (3)
#ifndef __KERNEL_DS
#define __KERNEL_DS (SUPER_DATA)
#endif
#define SUPER_PROGRAM (4)
#ifndef __ASSEMBLY__
typedef struct {
unsigned long seg;
} mm_segment_t;
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define USER_DS MAKE_MM_SEG(__USER_DS)
#define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS)
/*
* Get/set the SFC/DFC registers for MOVES instructions
*/
static inline mm_segment_t get_fs(void)
{
return USER_DS;
}
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#endif /* __ASSEMBLY__ */
#endif /* _H8300_SEGMENT_H */

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