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Commit 069ec229 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Thomas Gleixner:
 "This update contains:

   - MPX updates for handling 32bit processes

   - A fix for a long standing bug in 32bit signal frame handling
     related to FPU/XSAVE state

   - Handle get_xsave_addr() correctly in KVM

   - Fix SMAP check under paravirtualization

   - Add a comment to the static function trace entry to avoid further
     confusion about the difference to dynamic tracing"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpu: Fix SMAP check in PVOPS environments
  x86/ftrace: Add comment on static function tracing
  x86/fpu: Fix get_xsave_addr() behavior under virtualization
  x86/fpu: Fix 32-bit signal frame handling
  x86/mpx: Fix 32-bit address space calculation
  x86/mpx: Do proper get_user() when running 32-bit binaries on 64-bit kernels
parents 3ad5d7e0 581b7f15

arch/x86/kernel/cpu/common.c

+1 −2
Original line number Diff line number Diff line
@@ -273,10 +273,9 @@ __setup("nosmap", setup_disable_smap); 


static __always_inline void setup_smap(struct cpuinfo_x86 *c)

{

	unsigned long eflags;

	unsigned long eflags = native_save_fl();



	/* This should have been cleared long ago */

	raw_local_save_flags(eflags);

	BUG_ON(eflags & X86_EFLAGS_AC);



	if (cpu_has(c, X86_FEATURE_SMAP)) {

arch/x86/kernel/fpu/signal.c

+5 −6
Original line number Diff line number Diff line
@@ -385,20 +385,19 @@ fpu__alloc_mathframe(unsigned long sp, int ia32_frame, 
 */

void fpu__init_prepare_fx_sw_frame(void)

{

	int fsave_header_size = sizeof(struct fregs_state);

	int size = xstate_size + FP_XSTATE_MAGIC2_SIZE;



	if (config_enabled(CONFIG_X86_32))

		size += fsave_header_size;



	fx_sw_reserved.magic1 = FP_XSTATE_MAGIC1;

	fx_sw_reserved.extended_size = size;

	fx_sw_reserved.xfeatures = xfeatures_mask;

	fx_sw_reserved.xstate_size = xstate_size;



	if (config_enabled(CONFIG_IA32_EMULATION)) {

	if (config_enabled(CONFIG_IA32_EMULATION) ||

	    config_enabled(CONFIG_X86_32)) {

		int fsave_header_size = sizeof(struct fregs_state);



		fx_sw_reserved_ia32 = fx_sw_reserved;

		fx_sw_reserved_ia32.extended_size += fsave_header_size;

		fx_sw_reserved_ia32.extended_size = size + fsave_header_size;

	}

}

arch/x86/kernel/fpu/xstate.c

+0 −1
Original line number Diff line number Diff line
@@ -694,7 +694,6 @@ void *get_xsave_addr(struct xregs_state *xsave, int xstate_feature) 
	if (!boot_cpu_has(X86_FEATURE_XSAVE))

		return NULL;



	xsave = &current->thread.fpu.state.xsave;

	/*

	 * We should not ever be requesting features that we

	 * have not enabled.  Remember that pcntxt_mask is

arch/x86/kernel/mcount_64.S

+6 −0
Original line number Diff line number Diff line
@@ -278,6 +278,12 @@ trace: 
	/* save_mcount_regs fills in first two parameters */

	save_mcount_regs



	/*

	 * When DYNAMIC_FTRACE is not defined, ARCH_SUPPORTS_FTRACE_OPS is not

	 * set (see include/asm/ftrace.h and include/linux/ftrace.h).  Only the

	 * ip and parent ip are used and the list function is called when

	 * function tracing is enabled.

	 */

	call   *ftrace_trace_function



	restore_mcount_regs

arch/x86/mm/mpx.c

+41 −6
Original line number Diff line number Diff line
@@ -585,6 +585,29 @@ static unsigned long mpx_bd_entry_to_bt_addr(struct mm_struct *mm, 
	return bt_addr;

}



/*

 * We only want to do a 4-byte get_user() on 32-bit.  Otherwise,

 * we might run off the end of the bounds table if we are on

 * a 64-bit kernel and try to get 8 bytes.

 */

int get_user_bd_entry(struct mm_struct *mm, unsigned long *bd_entry_ret,

		long __user *bd_entry_ptr)

{

	u32 bd_entry_32;

	int ret;



	if (is_64bit_mm(mm))

		return get_user(*bd_entry_ret, bd_entry_ptr);



	/*

	 * Note that get_user() uses the type of the *pointer* to

	 * establish the size of the get, not the destination.

	 */

	ret = get_user(bd_entry_32, (u32 __user *)bd_entry_ptr);

	*bd_entry_ret = bd_entry_32;

	return ret;

}



/*

 * Get the base of bounds tables pointed by specific bounds

 * directory entry.
@@ -605,7 +628,7 @@ static int get_bt_addr(struct mm_struct *mm, 
		int need_write = 0;



		pagefault_disable();

		ret = get_user(bd_entry, bd_entry_ptr);

		ret = get_user_bd_entry(mm, &bd_entry, bd_entry_ptr);

		pagefault_enable();

		if (!ret)

			break;
@@ -700,11 +723,23 @@ static unsigned long mpx_get_bt_entry_offset_bytes(struct mm_struct *mm, 
 */

static inline unsigned long bd_entry_virt_space(struct mm_struct *mm)

{

	unsigned long long virt_space = (1ULL << boot_cpu_data.x86_virt_bits);

	if (is_64bit_mm(mm))

	unsigned long long virt_space;

	unsigned long long GB = (1ULL << 30);



	/*

	 * This covers 32-bit emulation as well as 32-bit kernels

	 * running on 64-bit harware.

	 */

	if (!is_64bit_mm(mm))

		return (4ULL * GB) / MPX_BD_NR_ENTRIES_32;



	/*

	 * 'x86_virt_bits' returns what the hardware is capable

	 * of, and returns the full >32-bit adddress space when

	 * running 32-bit kernels on 64-bit hardware.

	 */

	virt_space = (1ULL << boot_cpu_data.x86_virt_bits);

	return virt_space / MPX_BD_NR_ENTRIES_64;

	else

		return virt_space / MPX_BD_NR_ENTRIES_32;

}



/*