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x86: remove address space overrides using set_fs()

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Stop providing the possibility to override the address space using
set_fs() now that there is no need for that any more.  To properly
handle the TASK_SIZE_MAX checking for 4 vs 5-level page tables on
x86 a new alternative is introduced, which just like the one in
entry_64.S has to use the hardcoded virtual address bits to escape
the fact that TASK_SIZE_MAX isn't actually a constant when 5-level
page tables are enabled.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2020-09-03 16:22:40 +02:00
committed by Al Viro
parent a1d826d475
commit 47058bb54b
8 changed files with 39 additions and 77 deletions
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11
arch/x86/include/asm/processor.h
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@@ -482,10 +482,6 @@ extern unsigned int fpu_user_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];
@@ -538,8 +534,6 @@ struct thread_struct {
*/
unsigned long iopl_emul;
mm_segment_t addr_limit;
unsigned int sig_on_uaccess_err:1;
/* Floating point and extended processor state */
@@ -785,15 +779,12 @@ static inline void spin_lock_prefetch(const void *x)
#define INIT_THREAD { \
.sp0 = TOP_OF_INIT_STACK, \
.sysenter_cs = __KERNEL_CS, \
.addr_limit = KERNEL_DS, \
}
#define KSTK_ESP(task) (task_pt_regs(task)->sp)
#else
#define INIT_THREAD { \
.addr_limit = KERNEL_DS, \
}
#define INIT_THREAD { }
extern unsigned long KSTK_ESP(struct task_struct *task);