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powerpc: remove address space overrides using set_fs() 

Stop providing the possibility to override the address space using
set_fs() now that there is no need for that any more.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2020-09-03 16:22:42 +02:00 committed by Al Viro
parent c331652534
commit 5ae4998b5d
6 changed files with 9 additions and 64 deletions
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1
arch/powerpc/Kconfig
View File

@ -249,7 +249,6 @@ 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

7
arch/powerpc/include/asm/processor.h
View File

@ -83,10 +83,6 @@ struct task_struct;
void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
void release_thread(struct task_struct *);
typedef struct {
unsigned long seg;
} mm_segment_t;
#define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET]
#define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET]
@ -148,7 +144,6 @@ struct thread_struct {
unsigned long ksp_vsid;
#endif
struct pt_regs *regs; /* Pointer to saved register state */
mm_segment_t addr_limit; /* for get_fs() validation */
#ifdef CONFIG_BOOKE
/* BookE base exception scratch space; align on cacheline */
unsigned long normsave[8] ____cacheline_aligned;
@ -295,7 +290,6 @@ struct thread_struct {
#define INIT_THREAD { \
.ksp = INIT_SP, \
.ksp_limit = INIT_SP_LIMIT, \
.addr_limit = KERNEL_DS, \
.pgdir = swapper_pg_dir, \
.fpexc_mode = MSR_FE0 | MSR_FE1, \
SPEFSCR_INIT \
@ -303,7 +297,6 @@ struct thread_struct {
#else
#define INIT_THREAD { \
.ksp = INIT_SP, \
.addr_limit = KERNEL_DS, \
.fpexc_mode = 0, \
}
#endif

5
arch/powerpc/include/asm/thread_info.h
View File

@ -90,7 +90,6 @@ void arch_setup_new_exec(void);
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_FSCHECK 3 /* Check FS is USER_DS on return */
#define TIF_SYSCALL_EMU 4 /* syscall emulation active */
#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
#define TIF_PATCH_PENDING 6 /* pending live patching update */
@ -130,7 +129,6 @@ void arch_setup_new_exec(void);
#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
#define _TIF_NOHZ (1<<TIF_NOHZ)
#define _TIF_FSCHECK (1<<TIF_FSCHECK)
#define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU)
#define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
_TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
@ -138,8 +136,7 @@ void arch_setup_new_exec(void);
#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
_TIF_NOTIFY_RESUME | _TIF_UPROBE | \
_TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
_TIF_FSCHECK)
_TIF_RESTORE_TM | _TIF_PATCH_PENDING)
#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
/* Bits in local_flags */

51
arch/powerpc/include/asm/uaccess.h
View File

@ -8,62 +8,21 @@
#include <asm/extable.h>
#include <asm/kup.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.
*
* The fs/ds values are now the highest legal address in the "segment".
* This simplifies the checking in the routines below.
*/
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(~0UL)
#ifdef __powerpc64__
/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
#define TASK_SIZE_MAX TASK_SIZE_USER64
#else
#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
#define TASK_SIZE_MAX TASK_SIZE
#endif
#define get_fs() (current->thread.addr_limit)
static inline void set_fs(mm_segment_t fs)
static inline bool __access_ok(unsigned long addr, unsigned long size)
{
current->thread.addr_limit = fs;
/* On user-mode return check addr_limit (fs) is correct */
set_thread_flag(TIF_FSCHECK);
return addr < TASK_SIZE_MAX && size <= TASK_SIZE_MAX - addr;
}
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define user_addr_max() (get_fs().seg)
#ifdef __powerpc64__
/*
* This check is sufficient because there is a large enough
* gap between user addresses and the kernel addresses
*/
#define __access_ok(addr, size, segment) \
(((addr) <= (segment).seg) && ((size) <= (segment).seg))
#else
static inline int __access_ok(unsigned long addr, unsigned long size,
mm_segment_t seg)
{
if (addr > seg.seg)
return 0;
return (size == 0 || size - 1 <= seg.seg - addr);
}
#endif
#define access_ok(addr, size) \
(__chk_user_ptr(addr), \
__access_ok((__force unsigned long)(addr), (size), get_fs()))
__access_ok((unsigned long)(addr), (size)))
/*
* These are the main single-value transfer routines. They automatically

3
arch/powerpc/kernel/signal.c
View File

@ -312,9 +312,6 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
{
user_exit();
/* Check valid addr_limit, TIF check is done there */
addr_limit_user_check();
if (thread_info_flags & _TIF_UPROBE)
uprobe_notify_resume(regs);

6
arch/powerpc/lib/sstep.c
View File

@ -108,11 +108,11 @@ static nokprobe_inline long address_ok(struct pt_regs *regs,
{
if (!user_mode(regs))
return 1;
if (__access_ok(ea, nb, USER_DS))
if (__access_ok(ea, nb))
return 1;
if (__access_ok(ea, 1, USER_DS))
if (__access_ok(ea, 1))
/* Access overlaps the end of the user region */
regs->dar = USER_DS.seg;
regs->dar = TASK_SIZE_MAX - 1;
else
regs->dar = ea;
return 0;