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x86/uaccess: Move thread_info::addr_limit to thread_struct 

struct thread_info is a legacy mess.  To prepare for its partial removal,
move thread_info::addr_limit out.

As an added benefit, this way is simpler.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/15bee834d09402b47ac86f2feccdf6529f9bc5b0.1468527351.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2016-07-14 13:22:57 -07:00 committed by Ingo Molnar
parent 2a53ccbc0d
commit 13d4ea097d
12 changed files with 40 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/include/asm/checksum_32.h
View File

@ -2,8 +2,7 @@
#define _ASM_X86_CHECKSUM_32_H
#include <linux/in6.h>
#include <asm/uaccess.h>
#include <linux/uaccess.h>
/*
* computes the checksum of a memory block at buff, length len,

17
arch/x86/include/asm/processor.h
View File

@ -371,6 +371,10 @@ extern unsigned int xstate_size;
struct perf_event;
typedef struct {
unsigned long seg;
} mm_segment_t;
struct thread_struct {
/* Cached TLS descriptors: */
struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
@ -419,6 +423,8 @@ struct thread_struct {
/* Max allowed port in the bitmap, in bytes: */
unsigned io_bitmap_max;
mm_segment_t addr_limit;
unsigned int sig_on_uaccess_err:1;
unsigned int uaccess_err:1; /* uaccess failed */
@ -493,11 +499,6 @@ static inline void load_sp0(struct tss_struct *tss,
#define set_iopl_mask native_set_iopl_mask
#endif /* CONFIG_PARAVIRT */
typedef struct {
unsigned long seg;
} mm_segment_t;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
@ -719,6 +720,7 @@ static inline void spin_lock_prefetch(const void *x)
.sp0 = TOP_OF_INIT_STACK, \
.sysenter_cs = __KERNEL_CS, \
.io_bitmap_ptr = NULL, \
.addr_limit = KERNEL_DS, \
}
extern unsigned long thread_saved_pc(struct task_struct *tsk);
@ -768,8 +770,9 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX TASK_SIZE_MAX
#define INIT_THREAD { \
.sp0 = TOP_OF_INIT_STACK \
#define INIT_THREAD { \
.sp0 = TOP_OF_INIT_STACK, \
.addr_limit = KERNEL_DS, \
}
/*

7
arch/x86/include/asm/thread_info.h
View File

@ -57,7 +57,6 @@ struct thread_info {
__u32 flags; /* low level flags */
__u32 status; /* thread synchronous flags */
__u32 cpu; /* current CPU */
mm_segment_t addr_limit;
};
#define INIT_THREAD_INFO(tsk) \
@ -65,7 +64,6 @@ struct thread_info {
.task = &tsk, \
.flags = 0, \
.cpu = 0, \
.addr_limit = KERNEL_DS, \
}
#define init_thread_info (init_thread_union.thread_info)
@ -184,11 +182,6 @@ static inline unsigned long current_stack_pointer(void)
# define cpu_current_top_of_stack (cpu_tss + TSS_sp0)
#endif
/* Load thread_info address into "reg" */
#define GET_THREAD_INFO(reg) \
_ASM_MOV PER_CPU_VAR(cpu_current_top_of_stack),reg ; \
_ASM_SUB $(THREAD_SIZE),reg ;
/*
* ASM operand which evaluates to a 'thread_info' address of
* the current task, if it is known that "reg" is exactly "off"

6
arch/x86/include/asm/uaccess.h
View File

@ -29,12 +29,12 @@
#define USER_DS MAKE_MM_SEG(TASK_SIZE_MAX)
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define get_fs() (current->thread.addr_limit)
#define set_fs(x) (current->thread.addr_limit = (x))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define user_addr_max() (current_thread_info()->addr_limit.seg)
#define user_addr_max() (current->thread.addr_limit.seg)
#define __addr_ok(addr) \
((unsigned long __force)(addr) < user_addr_max())

4
arch/x86/kernel/asm-offsets.c
View File

@ -31,7 +31,9 @@ void common(void) {
BLANK();
OFFSET(TI_flags, thread_info, flags);
OFFSET(TI_status, thread_info, status);
OFFSET(TI_addr_limit, thread_info, addr_limit);
BLANK();
OFFSET(TASK_addr_limit, task_struct, thread.addr_limit);
BLANK();
OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx);

8
arch/x86/lib/copy_user_64.S
View File

@ -17,11 +17,11 @@
/* Standard copy_to_user with segment limit checking */
ENTRY(_copy_to_user)
GET_THREAD_INFO(%rax)
mov PER_CPU_VAR(current_task), %rax
movq %rdi,%rcx
addq %rdx,%rcx
jc bad_to_user
cmpq TI_addr_limit(%rax),%rcx
cmpq TASK_addr_limit(%rax),%rcx
ja bad_to_user
ALTERNATIVE_2 "jmp copy_user_generic_unrolled", \
"jmp copy_user_generic_string", \
@ -32,11 +32,11 @@ ENDPROC(_copy_to_user)
/* Standard copy_from_user with segment limit checking */
ENTRY(_copy_from_user)
GET_THREAD_INFO(%rax)
mov PER_CPU_VAR(current_task), %rax
movq %rsi,%rcx
addq %rdx,%rcx
jc bad_from_user
cmpq TI_addr_limit(%rax),%rcx
cmpq TASK_addr_limit(%rax),%rcx
ja bad_from_user
ALTERNATIVE_2 "jmp copy_user_generic_unrolled", \
"jmp copy_user_generic_string", \

1
arch/x86/lib/csum-wrappers_64.c
View File

@ -6,6 +6,7 @@
*/
#include <asm/checksum.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <asm/smap.h>
/**

20
arch/x86/lib/getuser.S
View File

@ -35,8 +35,8 @@
.text
ENTRY(__get_user_1)
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
mov PER_CPU_VAR(current_task), %_ASM_DX
cmp TASK_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
ASM_STAC
1: movzbl (%_ASM_AX),%edx
@ -48,8 +48,8 @@ ENDPROC(__get_user_1)
ENTRY(__get_user_2)
add $1,%_ASM_AX
jc bad_get_user
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
mov PER_CPU_VAR(current_task), %_ASM_DX
cmp TASK_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
ASM_STAC
2: movzwl -1(%_ASM_AX),%edx
@ -61,8 +61,8 @@ ENDPROC(__get_user_2)
ENTRY(__get_user_4)
add $3,%_ASM_AX
jc bad_get_user
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
mov PER_CPU_VAR(current_task), %_ASM_DX
cmp TASK_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
ASM_STAC
3: movl -3(%_ASM_AX),%edx
@ -75,8 +75,8 @@ ENTRY(__get_user_8)
#ifdef CONFIG_X86_64
add $7,%_ASM_AX
jc bad_get_user
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
mov PER_CPU_VAR(current_task), %_ASM_DX
cmp TASK_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
ASM_STAC
4: movq -7(%_ASM_AX),%rdx
@ -86,8 +86,8 @@ ENTRY(__get_user_8)
#else
add $7,%_ASM_AX
jc bad_get_user_8
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
mov PER_CPU_VAR(current_task), %_ASM_DX
cmp TASK_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user_8
ASM_STAC
4: movl -7(%_ASM_AX),%edx

10
arch/x86/lib/putuser.S
View File

@ -29,14 +29,14 @@
* as they get called from within inline assembly.
*/
#define ENTER GET_THREAD_INFO(%_ASM_BX)
#define ENTER mov PER_CPU_VAR(current_task), %_ASM_BX
#define EXIT ASM_CLAC ; \
ret
.text
ENTRY(__put_user_1)
ENTER
cmp TI_addr_limit(%_ASM_BX),%_ASM_CX
cmp TASK_addr_limit(%_ASM_BX),%_ASM_CX
jae bad_put_user
ASM_STAC
1: movb %al,(%_ASM_CX)
@ -46,7 +46,7 @@ ENDPROC(__put_user_1)
ENTRY(__put_user_2)
ENTER
mov TI_addr_limit(%_ASM_BX),%_ASM_BX
mov TASK_addr_limit(%_ASM_BX),%_ASM_BX
sub $1,%_ASM_BX
cmp %_ASM_BX,%_ASM_CX
jae bad_put_user
@ -58,7 +58,7 @@ ENDPROC(__put_user_2)
ENTRY(__put_user_4)
ENTER
mov TI_addr_limit(%_ASM_BX),%_ASM_BX
mov TASK_addr_limit(%_ASM_BX),%_ASM_BX
sub $3,%_ASM_BX
cmp %_ASM_BX,%_ASM_CX
jae bad_put_user
@ -70,7 +70,7 @@ ENDPROC(__put_user_4)
ENTRY(__put_user_8)
ENTER
mov TI_addr_limit(%_ASM_BX),%_ASM_BX
mov TASK_addr_limit(%_ASM_BX),%_ASM_BX
sub $7,%_ASM_BX
cmp %_ASM_BX,%_ASM_CX
jae bad_put_user

2
arch/x86/lib/usercopy_64.c
View File

@ -6,7 +6,7 @@
* Copyright 2002 Andi Kleen <ak@suse.de>
*/
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/uaccess.h>
/*
* Zero Userspace

2
drivers/pnp/isapnp/proc.c
View File

@ -21,7 +21,7 @@
#include <linux/isapnp.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <linux/uaccess.h>
extern struct pnp_protocol isapnp_protocol;

2
lib/bitmap.c
View File

@ -14,9 +14,9 @@
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <asm/page.h>
#include <asm/uaccess.h>
/*
* bitmaps provide an array of bits, implemented using an an