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authorChristoph Hellwig <hch@lst.de>2020-09-03 16:22:42 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2020-09-08 22:21:37 -0400
commit5ae4998b5d6fc703a16c9fa935fb7d335843bf22 (patch)
tree68666ba59e5c6f3fa10f341f514f2eddbc94c859 /arch
parentc33165253492b91337f88c84b11733a4a2d55b60 (diff)
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/Kconfig1
-rw-r--r--arch/powerpc/include/asm/processor.h7
-rw-r--r--arch/powerpc/include/asm/thread_info.h5
-rw-r--r--arch/powerpc/include/asm/uaccess.h51
-rw-r--r--arch/powerpc/kernel/signal.c3
-rw-r--r--arch/powerpc/lib/sstep.c6
6 files changed, 9 insertions, 64 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3f09d6fdf894..1f48bbfb3ce9 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -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
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index ed0d633ab5aa..f01e4d650c52 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -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
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index ca6c97025704..46a210b03d2b 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -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 */
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 7fe3531ad36a..be070254e509 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -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
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index d15a98c758b8..df547d8e31e4 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -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);
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index caee8cc77e19..8342188ea1ac 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -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;