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Commit 172de656 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 Peter Anvin.

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86-64, modify_ldt: Make support for 16-bit segments a runtime option
  x86, mm, hugetlb: Add missing TLB page invalidation for hugetlb_cow()
  x86, rdrand: When nordrand is specified, disable RDSEED as well
parents 95d08585 fa81511b

Documentation/kernel-parameters.txt

+4 −4
Original line number Diff line number Diff line
@@ -2218,10 +2218,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
	noreplace-smp	[X86-32,SMP] Don't replace SMP instructions

			with UP alternatives



	nordrand	[X86] Disable the direct use of the RDRAND

			instruction even if it is supported by the

			processor.  RDRAND is still available to user

			space applications.

	nordrand	[X86] Disable kernel use of the RDRAND and

			RDSEED instructions even if they are supported

			by the processor.  RDRAND and RDSEED are still

			available to user space applications.



	noresume	[SWSUSP] Disables resume and restores original swap

			space.

arch/x86/include/asm/hugetlb.h

+1 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 
static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,

					 unsigned long addr, pte_t *ptep)

{

	ptep_clear_flush(vma, addr, ptep);

}



static inline int huge_pte_none(pte_t pte)

arch/x86/kernel/cpu/rdrand.c

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
static int __init x86_rdrand_setup(char *s)

{

	setup_clear_cpu_cap(X86_FEATURE_RDRAND);

	setup_clear_cpu_cap(X86_FEATURE_RDSEED);

	return 1;

}

__setup("nordrand", x86_rdrand_setup);

arch/x86/kernel/ldt.c

+3 −1
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 
#include <asm/mmu_context.h>

#include <asm/syscalls.h>



int sysctl_ldt16 = 0;



#ifdef CONFIG_SMP

static void flush_ldt(void *current_mm)

{
@@ -234,7 +236,7 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode) 
	 * IRET leaking the high bits of the kernel stack address.

	 */

#ifdef CONFIG_X86_64

	if (!ldt_info.seg_32bit) {

	if (!ldt_info.seg_32bit && !sysctl_ldt16) {

		error = -EINVAL;

		goto out_unlock;

	}

arch/x86/vdso/vdso32-setup.c

+8 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 
#ifdef CONFIG_X86_64

#define vdso_enabled			sysctl_vsyscall32

#define arch_setup_additional_pages	syscall32_setup_pages

extern int sysctl_ldt16;

#endif



/*
@@ -249,6 +250,13 @@ static struct ctl_table abi_table2[] = { 
		.mode		= 0644,

		.proc_handler	= proc_dointvec

	},

	{

		.procname	= "ldt16",

		.data		= &sysctl_ldt16,

		.maxlen		= sizeof(int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec

	},

	{}

};