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Commit 8a5f0605 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:
 "A set of fixes for x86:

   - Fix the swapped outb() parameters in the KASLR code

   - Fix the PKEY handling at fork which missed to preserve the pkey
     state for the child. Comes with a test case to validate that.

   - Fix the entry stack handling for XEN PV to respect that XEN PV
     systems enter the function already on the current thread stack and
     not on the trampoline.

   - Fix kexec load failure caused by using a stale value when the
     kexec_buf structure is reused for subsequent allocations.

   - Fix a bogus sizeof() in the memory encryption code

   - Enforce PCI dependency for the Intel Low Power Subsystem

   - Enforce PCI_LOCKLESS_CONFIG when PCI is enabled"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/Kconfig: Select PCI_LOCKLESS_CONFIG if PCI is enabled
  x86/entry/64/compat: Fix stack switching for XEN PV
  x86/kexec: Fix a kexec_file_load() failure
  x86/mm/mem_encrypt: Fix erroneous sizeof()
  x86/selftests/pkeys: Fork() to check for state being preserved
  x86/pkeys: Properly copy pkey state at fork()
  x86/kaslr: Fix incorrect i8254 outb() parameters
  x86/intel/lpss: Make PCI dependency explicit
parents 351e1aa6 625210cf

arch/x86/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -198,7 +198,7 @@ config X86 
	select IRQ_FORCED_THREADING

	select NEED_SG_DMA_LENGTH

	select PCI_DOMAINS			if PCI

	select PCI_LOCKLESS_CONFIG

	select PCI_LOCKLESS_CONFIG		if PCI

	select PERF_EVENTS

	select RTC_LIB

	select RTC_MC146818_LIB

arch/x86/entry/entry_64_compat.S

+4 −2
Original line number Diff line number Diff line
@@ -361,7 +361,8 @@ ENTRY(entry_INT80_compat) 


	/* Need to switch before accessing the thread stack. */

	SWITCH_TO_KERNEL_CR3 scratch_reg=%rdi

	movq	%rsp, %rdi

	/* In the Xen PV case we already run on the thread stack. */

	ALTERNATIVE "movq %rsp, %rdi", "jmp .Lint80_keep_stack", X86_FEATURE_XENPV

	movq	PER_CPU_VAR(cpu_current_top_of_stack), %rsp



	pushq	6*8(%rdi)		/* regs->ss */
@@ -370,8 +371,9 @@ ENTRY(entry_INT80_compat) 
	pushq	3*8(%rdi)		/* regs->cs */

	pushq	2*8(%rdi)		/* regs->ip */

	pushq	1*8(%rdi)		/* regs->orig_ax */



	pushq	(%rdi)			/* pt_regs->di */

.Lint80_keep_stack:



	pushq	%rsi			/* pt_regs->si */

	xorl	%esi, %esi		/* nospec   si */

	pushq	%rdx			/* pt_regs->dx */

arch/x86/include/asm/mmu_context.h

+18 −0
Original line number Diff line number Diff line
@@ -178,6 +178,10 @@ static inline void switch_ldt(struct mm_struct *prev, struct mm_struct *next) 


void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk);



/*

 * Init a new mm.  Used on mm copies, like at fork()

 * and on mm's that are brand-new, like at execve().

 */

static inline int init_new_context(struct task_struct *tsk,

				   struct mm_struct *mm)

{
@@ -228,8 +232,22 @@ do { \ 
} while (0)

#endif



static inline void arch_dup_pkeys(struct mm_struct *oldmm,

				  struct mm_struct *mm)

{

#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS

	if (!cpu_feature_enabled(X86_FEATURE_OSPKE))

		return;



	/* Duplicate the oldmm pkey state in mm: */

	mm->context.pkey_allocation_map = oldmm->context.pkey_allocation_map;

	mm->context.execute_only_pkey   = oldmm->context.execute_only_pkey;

#endif

}



static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)

{

	arch_dup_pkeys(oldmm, mm);

	paravirt_arch_dup_mmap(oldmm, mm);

	return ldt_dup_context(oldmm, mm);

}

arch/x86/kernel/crash.c

+1 −0
Original line number Diff line number Diff line
@@ -470,6 +470,7 @@ int crash_load_segments(struct kimage *image) 


	kbuf.memsz = kbuf.bufsz;

	kbuf.buf_align = ELF_CORE_HEADER_ALIGN;

	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;

	ret = kexec_add_buffer(&kbuf);

	if (ret) {

		vfree((void *)image->arch.elf_headers);

arch/x86/kernel/kexec-bzimage64.c

+2 −0
Original line number Diff line number Diff line
@@ -434,6 +434,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel, 
	kbuf.memsz = PAGE_ALIGN(header->init_size);

	kbuf.buf_align = header->kernel_alignment;

	kbuf.buf_min = MIN_KERNEL_LOAD_ADDR;

	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;

	ret = kexec_add_buffer(&kbuf);

	if (ret)

		goto out_free_params;
@@ -448,6 +449,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel, 
		kbuf.bufsz = kbuf.memsz = initrd_len;

		kbuf.buf_align = PAGE_SIZE;

		kbuf.buf_min = MIN_INITRD_LOAD_ADDR;

		kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;

		ret = kexec_add_buffer(&kbuf);

		if (ret)

			goto out_free_params;