config HAVE_IMA_KEXEC
bool
-config SET_FS
- bool
-
config HOTPLUG_SMT
bool
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
#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 { }
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 */
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
- .addr_limit = KERNEL_DS, \
.preempt_count = INIT_PREEMPT_COUNT, \
}
#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.
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
+++ /dev/null
-/* 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 */
#ifndef __ASSEMBLY__
#include <linux/thread_info.h>
-#include <asm/segment.h>
/*
* low level task data that entry.S needs immediate access to
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 */
};
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
}
static inline __attribute_const__ struct thread_info *current_thread_info(void)
#define __clear_user(d, n) arc_clear_user_noinline(d, n)
#endif
-#include <asm/segment.h>
#include <asm-generic/uaccess.h>
#endif
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();
{
unsigned long ua_flags;
- if (uaccess_kernel()) {
- memset((void *)addr, 0, n);
- return 0;
- }
-
mmap_read_lock(current->mm);
while (n) {
pte_t *pte;
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(); \
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
#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>
*/
#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; \
+++ /dev/null
-/* 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 */
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;
{ \
.task = &tsk, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
.cpu = 0, \
.restart_block = { \
.fn = do_no_restart_syscall, \
#ifndef __ASM_CSKY_UACCESS_H
#define __ASM_CSKY_UACCESS_H
-#define user_addr_max() (current_thread_info()->addr_limit.seg)
-
/*
* __put_user_fn
*/
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 */
/* 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));
select HAVE_ARCH_KGDB
select HAVE_ARCH_HASH
select CPU_NO_EFFICIENT_FFS
- select SET_FS
select UACCESS_MEMCPY
config CPU_BIG_ENDIAN
#define __ASM_H8300_PROCESSOR_H
#include <linux/compiler.h>
-#include <asm/segment.h>
#include <asm/ptrace.h>
#include <asm/current.h>
+++ /dev/null
-/* 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 */
#define _ASM_THREAD_INFO_H
#include <asm/page.h>
-#include <asm/segment.h>
#ifdef __KERNEL__
unsigned long flags; /* low level flags */
int cpu; /* cpu we're on */
int preempt_count; /* 0 => preemptable, <0 => BUG */
- mm_segment_t addr_limit;
};
/*
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
}
/* how to get the thread information struct from C */
#include <linux/sys.h>
#include <asm/unistd.h>
#include <asm/setup.h>
-#include <asm/segment.h>
#include <asm/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <linux/init.h>
#include <asm/unistd.h>
#include <asm/setup.h>
-#include <asm/segment.h>
#include <asm/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <linux/gfp.h>
#include <asm/setup.h>
-#include <asm/segment.h>
#include <asm/page.h>
#include <asm/sections.h>
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE);
- /*
- * Set up SFC/DFC registers (user data space).
- */
- set_fs(USER_DS);
-
pr_debug("before free_area_init\n");
pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
#include <linux/types.h>
#include <asm/setup.h>
-#include <asm/segment.h>
#include <asm/page.h>
#include <asm/traps.h>
#include <asm/io.h>
select GENERIC_CLOCKEVENTS_BROADCAST
select MODULES_USE_ELF_RELA
select GENERIC_CPU_DEVICES
- select SET_FS
select ARCH_WANT_LD_ORPHAN_WARN
select TRACE_IRQFLAGS_SUPPORT
help
#ifndef __ASSEMBLY__
-typedef struct {
- unsigned long seg;
-} mm_segment_t;
-
/*
* This is union'd with the "bottom" of the kernel stack.
* It keeps track of thread info which is handy for routines
unsigned long flags; /* low level flags */
__u32 cpu; /* current cpu */
int preempt_count; /* 0=>preemptible,<0=>BUG */
- mm_segment_t addr_limit; /* segmentation sux */
/*
* used for syscalls somehow;
* seems to have a function pointer and four arguments
.flags = 0, \
.cpu = 0, \
.preempt_count = 1, \
- .addr_limit = KERNEL_DS, \
.sp = 0, \
.regs = NULL, \
}
/*
* Parent sees new pid -- not necessary, not even possible at
* this point in the fork process
- * Might also want to set things like ti->addr_limit
*/
return 0;
select CPU_NO_EFFICIENT_FFS
select MMU_GATHER_NO_RANGE
select SPARSE_IRQ
- select SET_FS
select ZONE_DMA
select TRACE_IRQFLAGS_SUPPORT
__u32 fsr;
};
-typedef struct {
- unsigned long seg;
-} mm_segment_t;
-
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags; /* low level flags */
unsigned long status; /* thread-synchronous flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
- mm_segment_t addr_limit; /* thread address space */
struct cpu_context cpu_context;
};
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
}
/* how to get the thread information struct from C */
#include <linux/pgtable.h>
#include <asm/extable.h>
#include <linux/string.h>
-
-/*
- * On Microblaze the fs value is actually the top of the corresponding
- * address space.
- *
- * 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.
- *
- * For historical reasons, these macros are grossly misnamed.
- *
- * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
- */
-# define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
-# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
-
-# define get_fs() (current_thread_info()->addr_limit)
-# define set_fs(val) (current_thread_info()->addr_limit = (val))
-# define user_addr_max() get_fs().seg
-
-# define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
-
#include <asm-generic/access_ok.h>
# define __FIXUP_SECTION ".section .fixup,\"ax\"\n"
/* struct thread_info */
DEFINE(TI_TASK, offsetof(struct thread_info, task));
DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
- DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit));
DEFINE(TI_CPU_CONTEXT, offsetof(struct thread_info, cpu_context));
DEFINE(TI_PREEMPT_COUNT, offsetof(struct thread_info, preempt_count));
BLANK();
#include <linux/tick.h>
#include <linux/bitops.h>
#include <linux/ptrace.h>
-#include <linux/uaccess.h> /* for USER_DS macros */
#include <asm/cacheflush.h>
void show_regs(struct pt_regs *regs)
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
- select SET_FS
select TRACE_IRQFLAGS_SUPPORT
help
Andes(nds32) Linux support.
#include <asm/ptrace.h>
#include <asm/types.h>
-typedef unsigned long mm_segment_t;
-
/*
* low level task data that entry.S needs immediate access to.
* __switch_to() assumes cpu_context follows immediately after cpu_domain.
struct thread_info {
unsigned long flags; /* low level flags */
__s32 preempt_count; /* 0 => preemptable, <0 => bug */
- mm_segment_t addr_limit; /* address limit */
};
#define INIT_THREAD_INFO(tsk) \
{ \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
}
#define thread_saved_pc(tsk) ((unsigned long)(tsk->thread.cpu_context.pc))
#define thread_saved_fp(tsk) ((unsigned long)(tsk->thread.cpu_context.fp))
#include <asm/errno.h>
#include <asm/memory.h>
#include <asm/types.h>
+#include <asm-generic/access_ok.h>
#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
extern int fixup_exception(struct pt_regs *regs);
-#define KERNEL_DS ((mm_segment_t) { ~0UL })
-#define USER_DS ((mm_segment_t) {TASK_SIZE - 1})
-
-#define get_fs() (current_thread_info()->addr_limit)
-#define user_addr_max get_fs
-#define uaccess_kernel() (get_fs() == KERNEL_DS)
-
-static inline void set_fs(mm_segment_t fs)
-{
- current_thread_info()->addr_limit = fs;
-}
-
-#include <asm-generic/access_ok.h>
-
/*
* Single-value transfer routines. They automatically use the right
* size if we just have the right pointer type. Note that the functions
regs->uregs[7], regs->uregs[6], regs->uregs[5], regs->uregs[4]);
pr_info("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
regs->uregs[3], regs->uregs[2], regs->uregs[1], regs->uregs[0]);
- pr_info(" IRQs o%s Segment %s\n",
- interrupts_enabled(regs) ? "n" : "ff",
- uaccess_kernel() ? "kernel" : "user");
+ pr_info(" IRQs o%s Segment user\n",
+ interrupts_enabled(regs) ? "n" : "ff");
}
EXPORT_SYMBOL(show_regs);
{
unsigned long inst;
int ret = -EFAULT;
- mm_segment_t seg;
inst = get_inst(regs->ipc);
"Faulting addr: 0x%08lx, pc: 0x%08lx [inst: 0x%08lx ]\n", addr,
regs->ipc, inst);
- seg = force_uaccess_begin();
if (inst & NDS32_16BIT_INSTRUCTION)
ret = do_16((inst >> 16) & 0xffff, regs);
else
ret = do_32(inst, regs);
- force_uaccess_end(seg);
return ret;
}
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
#ifndef __ASSEMBLY__
-typedef struct {
- unsigned long seg;
-} mm_segment_t;
-
/*
* low level task data that entry.S needs immediate access to
* - this struct should fit entirely inside of one cache line
unsigned long flags; /* low level flags */
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable,<0 => BUG */
- mm_segment_t addr_limit; /* thread address space:
- 0-0x7FFFFFFF for user-thead
- 0-0xFFFFFFFF for kernel-thread
- */
struct pt_regs *regs;
};
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
}
/* how to get the thread information struct from C */
#include <asm/page.h>
#include <asm/extable.h>
-
-/*
- * Segment stuff
- */
-#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-#define USER_DS MAKE_MM_SEG(0x80000000UL)
-#define KERNEL_DS MAKE_MM_SEG(0)
-
-
-#define get_fs() (current_thread_info()->addr_limit)
-#define set_fs(seg) (current_thread_info()->addr_limit = (seg))
-
#include <asm-generic/access_ok.h>
# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
select ARCH_WANT_FRAME_POINTERS
select GENERIC_IRQ_MULTI_HANDLER
select MMU_GATHER_NO_RANGE if MMU
- select SET_FS
select TRACE_IRQFLAGS_SUPPORT
config CPU_BIG_ENDIAN
*/
#ifndef __ASSEMBLY__
-typedef unsigned long mm_segment_t;
-
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags; /* low level flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
- mm_segment_t addr_limit; /* thread address space:
- 0-0x7FFFFFFF for user-thead
- 0-0xFFFFFFFF for kernel-thread
- */
__u8 supervisor_stack[0];
/* saved context data */
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
.ksp = 0, \
}
#include <linux/string.h>
#include <asm/page.h>
#include <asm/extable.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.
- *
- * For historical reasons, these macros are grossly misnamed.
- */
-
-/* addr_limit is the maximum accessible address for the task. we misuse
- * the KERNEL_DS and USER_DS values to both assign and compare the
- * addr_limit values through the equally misnamed get/set_fs macros.
- * (see above)
- */
-
-#define KERNEL_DS (~0UL)
-
-#define USER_DS (TASK_SIZE)
-#define get_fs() (current_thread_info()->addr_limit)
-#define set_fs(x) (current_thread_info()->addr_limit = (x))
-
-#define uaccess_kernel() (get_fs() == KERNEL_DS)
-
#include <asm-generic/access_ok.h>
/*
u32 val;
unsigned long flags;
- /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
- * our gateway page, and causes no end of trouble...
- */
- if (uaccess_kernel() && !uaddr)
- return -EFAULT;
-
if (!access_ok(uaddr, sizeof(u32)))
return -EFAULT;
DBG(1,"setup_rt_frame: frame %p info %p\n", frame, ksig->info);
start = (unsigned long) frame;
- if (start >= user_addr_max() - sigframe_size)
+ if (start >= TASK_SIZE_MAX - sigframe_size)
return -EFAULT;
#ifdef CONFIG_64BIT
long err = 0;
/* check that we don't exceed the stack */
- if (A(&usp[0]) >= user_addr_max() - 5 * sizeof(int))
+ if (A(&usp[0]) >= TASK_SIZE_MAX - 5 * sizeof(int))
return;
/* Setup a trampoline to restart the syscall
#include <linux/compiler.h>
#include <linux/uaccess.h>
-#define get_user_space() (uaccess_kernel() ? 0 : mfsp(3))
+#define get_user_space() (mfsp(3))
#define get_kernel_space() (0)
/* Returns 0 for success, otherwise, returns number of bytes not transferred. */
select HAVE_UID16
select OLD_SIGACTION
select ZONE_DMA
- select SET_FS
config SPARC64
def_bool 64BIT
};
#endif
-typedef struct {
- int seg;
-} mm_segment_t;
-
/* The Sparc processor specific thread struct. */
struct thread_struct {
struct pt_regs *kregs;
unsigned long fsr;
unsigned long fpqdepth;
struct fpq fpqueue[16];
- mm_segment_t current_ds;
};
#define INIT_THREAD { \
- .current_ds = KERNEL_DS, \
.kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
}
#include <linux/string.h>
#include <asm/processor.h>
-
-/* Sparc is not segmented, however we need to be able to fool access_ok()
- * when doing system calls from kernel mode legitimately.
- *
- * "For historical reasons, these macros are grossly misnamed." -Linus
- */
-
-#define KERNEL_DS ((mm_segment_t) { 0 })
-#define USER_DS ((mm_segment_t) { -1 })
-
-#define get_fs() (current->thread.current_ds)
-#define set_fs(val) ((current->thread.current_ds) = (val))
-
#include <asm-generic/access_ok.h>
/* Uh, these should become the main single-value transfer routines..
extern int nwindows;
unsigned long psr;
memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
- p->thread.current_ds = KERNEL_DS;
ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
childregs->u_regs[UREG_G1] = sp; /* function */
childregs->u_regs[UREG_G2] = arg;
}
memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
childregs->u_regs[UREG_FP] = sp;
- p->thread.current_ds = USER_DS;
ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
ti->kwim = current->thread.fork_kwim;
select IRQ_DOMAIN
select MODULES_USE_ELF_RELA
select PERF_USE_VMALLOC
- select SET_FS
select TRACE_IRQFLAGS_SUPPORT
select VIRT_TO_BUS
help
#include <asm/asm-offsets.h>
#include <asm/processor.h>
-/*
- * These assembly macros mirror the C macros in asm/uaccess.h. They
- * should always have identical functionality. See
- * arch/xtensa/kernel/sys.S for usage.
- */
-
-#define KERNEL_DS 0
-#define USER_DS 1
-
-/*
- * get_fs reads current->thread.current_ds into a register.
- * On Entry:
- * <ad> anything
- * <sp> stack
- * On Exit:
- * <ad> contains current->thread.current_ds
- */
- .macro get_fs ad, sp
- GET_CURRENT(\ad,\sp)
-#if THREAD_CURRENT_DS > 1020
- addi \ad, \ad, TASK_THREAD
- l32i \ad, \ad, THREAD_CURRENT_DS - TASK_THREAD
-#else
- l32i \ad, \ad, THREAD_CURRENT_DS
-#endif
- .endm
-
-/*
- * set_fs sets current->thread.current_ds to some value.
- * On Entry:
- * <at> anything (temp register)
- * <av> value to write
- * <sp> stack
- * On Exit:
- * <at> destroyed (actually, current)
- * <av> preserved, value to write
- */
- .macro set_fs at, av, sp
- GET_CURRENT(\at,\sp)
- s32i \av, \at, THREAD_CURRENT_DS
- .endm
-
-/*
- * kernel_ok determines whether we should bypass addr/size checking.
- * See the equivalent C-macro version below for clarity.
- * On success, kernel_ok branches to a label indicated by parameter
- * <success>. This implies that the macro falls through to the next
- * insruction on an error.
- *
- * Note that while this macro can be used independently, we designed
- * in for optimal use in the access_ok macro below (i.e., we fall
- * through on error).
- *
- * On Entry:
- * <at> anything (temp register)
- * <success> label to branch to on success; implies
- * fall-through macro on error
- * <sp> stack pointer
- * On Exit:
- * <at> destroyed (actually, current->thread.current_ds)
- */
-
-#if ((KERNEL_DS != 0) || (USER_DS == 0))
-# error Assembly macro kernel_ok fails
-#endif
- .macro kernel_ok at, sp, success
- get_fs \at, \sp
- beqz \at, \success
- .endm
-
/*
* user_ok determines whether the access to user-space memory is allowed.
* See the equivalent C-macro version below for clarity.
* <at> destroyed
*/
.macro access_ok aa, as, at, sp, error
- kernel_ok \at, \sp, .Laccess_ok_\@
user_ok \aa, \as, \at, \error
.Laccess_ok_\@:
.endm
*/
#define SPILL_SLOT_CALL12(sp, reg) (*(((unsigned long *)(sp)) - 16 + (reg)))
-typedef struct {
- unsigned long seg;
-} mm_segment_t;
-
struct thread_struct {
/* kernel's return address and stack pointer for context switching */
unsigned long ra; /* kernel's a0: return address and window call size */
unsigned long sp; /* kernel's a1: stack pointer */
- mm_segment_t current_ds; /* see uaccess.h for example uses */
-
/* struct xtensa_cpuinfo info; */
unsigned long bad_vaddr; /* last user fault */
{ \
ra: 0, \
sp: sizeof(init_stack) + (long) &init_stack, \
- current_ds: {0}, \
/*info: {0}, */ \
bad_vaddr: 0, \
bad_uaddr: 0, \
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
- mm_segment_t addr_limit; /* thread address space */
-
unsigned long cpenable;
#if XCHAL_HAVE_EXCLUSIVE
/* result of the most recent exclusive store */
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
}
/* how to get the thread information struct from C */
#include <linux/prefetch.h>
#include <asm/types.h>
#include <asm/extable.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.
- *
- * For historical reasons (Data Segment Register?), these macros are
- * grossly misnamed.
- */
-
-#define KERNEL_DS ((mm_segment_t) { 0 })
-#define USER_DS ((mm_segment_t) { 1 })
-
-#define get_fs() (current->thread.current_ds)
-#define set_fs(val) (current->thread.current_ds = (val))
-
#include <asm-generic/access_ok.h>
/*
OFFSET(TI_STSTUS, thread_info, status);
OFFSET(TI_CPU, thread_info, cpu);
OFFSET(TI_PRE_COUNT, thread_info, preempt_count);
- OFFSET(TI_ADDR_LIMIT, thread_info, addr_limit);
/* struct thread_info (offset from start_struct) */
DEFINE(THREAD_RA, offsetof (struct task_struct, thread.ra));
#endif
DEFINE(THREAD_XTREGS_USER, offsetof (struct thread_info, xtregs_user));
DEFINE(XTREGS_USER_SIZE, sizeof(xtregs_user_t));
- DEFINE(THREAD_CURRENT_DS, offsetof (struct task_struct, \
- thread.current_ds));
/* struct mm_struct */
DEFINE(MM_USERS, offsetof(struct mm_struct, mm_users));
* copied from, so it's unsafe to allow this with elevated
* privileges (e.g. from a setuid binary) or via kernel_write().
*/
- if (file->f_cred != current_cred() || uaccess_kernel()) {
+ if (file->f_cred != current_cred()) {
pr_err_once("UHID_CREATE from different security context by process %d (%s), this is not allowed.\n",
task_tgid_vnr(current), current->comm);
ret = -EACCES;
caller, task_tgid_vnr(current), current->comm);
return -EPERM;
}
- if (uaccess_kernel()) {
- pr_err_once("%s: process %d (%s) called from kernel context, this is not allowed.\n",
- caller, task_tgid_vnr(current), current->comm);
- return -EACCES;
- }
return 0;
}
if (retval)
goto out_unlock;
- /*
- * Ensure that the uaccess routines can actually operate on userspace
- * pointers:
- */
- force_uaccess_begin();
-
if (me->flags & PF_KTHREAD)
free_kthread_struct(me);
me->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD |
#define TASK_SIZE_MAX TASK_SIZE
#endif
-#ifndef uaccess_kernel
-#ifdef CONFIG_SET_FS
-#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
-#else
-#define uaccess_kernel() (0)
-#endif
-#endif
-
-#ifndef user_addr_max
-#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE_MAX)
-#endif
-
#ifndef __access_ok
/*
* 'size' is a compile-time constant for most callers, so optimize for
*/
static inline int __access_ok(const void __user *ptr, unsigned long size)
{
- unsigned long limit = user_addr_max();
+ unsigned long limit = TASK_SIZE_MAX;
unsigned long addr = (unsigned long)ptr;
if (IS_ENABLED(CONFIG_ALTERNATE_USER_ADDRESS_SPACE) ||
* address space, e.g. all NOMMU machines.
*/
#include <linux/string.h>
+#include <asm-generic/access_ok.h>
#ifdef CONFIG_UACCESS_MEMCPY
#include <asm/unaligned.h>
#define INLINE_COPY_TO_USER
#endif /* CONFIG_UACCESS_MEMCPY */
-#ifdef CONFIG_SET_FS
-#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-#ifndef KERNEL_DS
-#define KERNEL_DS MAKE_MM_SEG(~0UL)
-#endif
-
-#ifndef USER_DS
-#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
-#endif
-
-#ifndef get_fs
-#define get_fs() (current_thread_info()->addr_limit)
-
-static inline void set_fs(mm_segment_t fs)
-{
- current_thread_info()->addr_limit = fs;
-}
-#endif
-
-#endif /* CONFIG_SET_FS */
-
-#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.
return;
#endif
- if (CHECK_DATA_CORRUPTION(uaccess_kernel(),
- "Invalid address limit on user-mode return"))
- force_sig(SIGKILL);
-
#ifdef TIF_FSCHECK
clear_thread_flag(TIF_FSCHECK);
#endif
#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
- * using force_uaccess_end below.
- */
-static inline mm_segment_t force_uaccess_begin(void)
-{
- mm_segment_t fs = get_fs();
-
- set_fs(USER_DS);
- return fs;
-}
-
-static inline void force_uaccess_end(mm_segment_t oldfs)
-{
- set_fs(oldfs);
-}
-#else /* CONFIG_SET_FS */
-typedef struct {
- /* empty dummy */
-} mm_segment_t;
-
-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())
* and get rid of their private instances of copy_{to,from}_user() and
*/
static inline bool ib_safe_file_access(struct file *filp)
{
- return filp->f_cred == current_cred() && !uaccess_kernel();
+ return filp->f_cred == current_cred();
}
#endif /* _RDMA_IB_H */
}
if (regs) {
- mm_segment_t fs;
-
if (crosstask)
goto exit_put;
if (add_mark)
perf_callchain_store_context(&ctx, PERF_CONTEXT_USER);
- fs = force_uaccess_begin();
perf_callchain_user(&ctx, regs);
- force_uaccess_end(fs);
}
}
unsigned long sp;
unsigned int rem;
u64 dyn_size;
- mm_segment_t fs;
/*
* We dump:
/* Data. */
sp = perf_user_stack_pointer(regs);
- fs = force_uaccess_begin();
rem = __output_copy_user(handle, (void *) sp, dump_size);
- force_uaccess_end(fs);
dyn_size = dump_size - rem;
perf_output_skip(handle, rem);
WARN_ON(blk_needs_flush_plug(tsk));
- /*
- * If do_dead is called because this processes oopsed, it's possible
- * that get_fs() was left as KERNEL_DS, so reset it to USER_DS before
- * continuing. Amongst other possible reasons, this is to prevent
- * mm_release()->clear_child_tid() from writing to a user-controlled
- * kernel address.
- *
- * On uptodate architectures force_uaccess_begin is a noop. On
- * architectures that still have set_fs/get_fs in addition to handling
- * oopses handles kernel threads that run as set_fs(KERNEL_DS) by
- * default.
- */
- force_uaccess_begin();
-
kcov_task_exit(tsk);
coredump_task_exit(tsk);
int result;
int (*threadfn)(void *);
void *data;
- mm_segment_t oldfs;
struct completion parked;
struct completion exited;
#ifdef CONFIG_BLK_CGROUP
mmdrop(active_mm);
else
smp_mb();
-
- to_kthread(tsk)->oldfs = force_uaccess_begin();
}
EXPORT_SYMBOL_GPL(kthread_use_mm);
WARN_ON_ONCE(!(tsk->flags & PF_KTHREAD));
WARN_ON_ONCE(!tsk->mm);
- force_uaccess_end(to_kthread(tsk)->oldfs);
-
task_lock(tsk);
/*
* When a kthread stops operating on an address space, the loop
.store = store,
.size = size,
};
- mm_segment_t fs;
/* Trace user stack if not a kernel thread */
if (current->flags & PF_KTHREAD)
return 0;
- fs = force_uaccess_begin();
arch_stack_walk_user(consume_entry, &c, task_pt_regs(current));
- force_uaccess_end(fs);
return c.len;
}
if (unlikely(in_interrupt() ||
current->flags & (PF_KTHREAD | PF_EXITING)))
return -EPERM;
- if (unlikely(uaccess_kernel()))
- return -EPERM;
if (unlikely(!nmi_uaccess_okay()))
return -EPERM;
*/
if (unlikely(current->flags & (PF_KTHREAD | PF_EXITING)))
return -EPERM;
- if (unlikely(uaccess_kernel()))
- return -EPERM;
if (unlikely(!nmi_uaccess_okay()))
return -EPERM;
if (unlikely(count <= 0))
return 0;
- max_addr = user_addr_max();
+ max_addr = TASK_SIZE_MAX;
src_addr = (unsigned long)untagged_addr(src);
if (likely(src_addr < max_addr)) {
unsigned long max = max_addr - src_addr;
if (unlikely(count <= 0))
return 0;
- max_addr = user_addr_max();
+ max_addr = TASK_SIZE_MAX;
src_addr = (unsigned long)untagged_addr(str);
if (likely(src_addr < max_addr)) {
unsigned long max = max_addr - src_addr;
long copy_from_user_nofault(void *dst, const void __user *src, size_t size)
{
long ret = -EFAULT;
- mm_segment_t old_fs = force_uaccess_begin();
-
if (access_ok(src, size)) {
pagefault_disable();
ret = __copy_from_user_inatomic(dst, src, size);
pagefault_enable();
}
- force_uaccess_end(old_fs);
if (ret)
return -EFAULT;
long copy_to_user_nofault(void __user *dst, const void *src, size_t size)
{
long ret = -EFAULT;
- mm_segment_t old_fs = force_uaccess_begin();
if (access_ok(dst, size)) {
pagefault_disable();
ret = __copy_to_user_inatomic(dst, src, size);
pagefault_enable();
}
- force_uaccess_end(old_fs);
if (ret)
return -EFAULT;
long strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
long count)
{
- mm_segment_t old_fs;
long ret;
if (unlikely(count <= 0))
return 0;
- old_fs = force_uaccess_begin();
pagefault_disable();
ret = strncpy_from_user(dst, unsafe_addr, count);
pagefault_enable();
- force_uaccess_end(old_fs);
if (ret >= count) {
ret = count;
*/
long strnlen_user_nofault(const void __user *unsafe_addr, long count)
{
- mm_segment_t old_fs;
int ret;
- old_fs = force_uaccess_begin();
pagefault_disable();
ret = strnlen_user(unsafe_addr, count);
pagefault_enable();
- force_uaccess_end(old_fs);
return ret;
}
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)
void __might_fault(const char *file, int line)
{
- /*
- * Some code (nfs/sunrpc) uses socket ops on kernel memory while
- * holding the mmap_lock, this is safe because kernel memory doesn't
- * get paged out, therefore we'll never actually fault, and the
- * below annotations will generate false positives.
- */
- if (uaccess_kernel())
- return;
if (pagefault_disabled())
return;
__might_sleep(file, line);
.addr = (uintptr_t)optval.user,
.len = optlen,
};
- if (uaccess_kernel() || sockptr_is_kernel(optval)) {
+ if (sockptr_is_kernel(optval)) {
pr_err("kernel access not supported\n");
return -EFAULT;
}
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