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>
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index cbdfe5f..89314ed 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -371,6 +371,10 @@
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 @@
/* 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 @@
#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 @@
.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 @@
#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, \
}
/*