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Merge branch 'x86/espfix' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next
Pull x86-64 espfix changes from Peter Anvin: "This is the espfix64 code, which fixes the IRET information leak as well as the associated functionality problem. With this code applied, 16-bit stack segments finally work as intended even on a 64-bit kernel. Consequently, this patchset also removes the runtime option that we added as an interim measure. To help the people working on Linux kernels for very small systems, this patchset also makes these compile-time configurable features" * 'x86/espfix' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option" x86, espfix: Make it possible to disable 16-bit support x86, espfix: Make espfix64 a Kconfig option, fix UML x86, espfix: Fix broken header guard x86, espfix: Move espfix definitions into a separate header file x86-32, espfix: Remove filter for espfix32 due to race x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack
This commit is contained in:
Linus Torvalds
commit
2071b3e34f
@ -12,6 +12,8 @@ ffffc90000000000 - ffffe8ffffffffff (=45 bits) vmalloc/ioremap space
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ffffe90000000000 - ffffe9ffffffffff (=40 bits) hole
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ffffea0000000000 - ffffeaffffffffff (=40 bits) virtual memory map (1TB)
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... unused hole ...
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ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
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... unused hole ...
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ffffffff80000000 - ffffffffa0000000 (=512 MB) kernel text mapping, from phys 0
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ffffffffa0000000 - ffffffffff5fffff (=1525 MB) module mapping space
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ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
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@ -912,10 +912,27 @@ config VM86
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default y
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depends on X86_32
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---help---
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This option is required by programs like DOSEMU to run 16-bit legacy
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code on X86 processors. It also may be needed by software like
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XFree86 to initialize some video cards via BIOS. Disabling this
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option saves about 6k.
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This option is required by programs like DOSEMU to run
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16-bit real mode legacy code on x86 processors. It also may
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be needed by software like XFree86 to initialize some video
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cards via BIOS. Disabling this option saves about 6K.
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config X86_16BIT
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bool "Enable support for 16-bit segments" if EXPERT
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default y
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---help---
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This option is required by programs like Wine to run 16-bit
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protected mode legacy code on x86 processors. Disabling
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this option saves about 300 bytes on i386, or around 6K text
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plus 16K runtime memory on x86-64,
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config X86_ESPFIX32
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def_bool y
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depends on X86_16BIT && X86_32
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config X86_ESPFIX64
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def_bool y
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depends on X86_16BIT && X86_64
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config TOSHIBA
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tristate "Toshiba Laptop support"
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16
arch/x86/include/asm/espfix.h
Normal file
16
arch/x86/include/asm/espfix.h
Normal file
@ -0,0 +1,16 @@
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#ifndef _ASM_X86_ESPFIX_H
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#define _ASM_X86_ESPFIX_H
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#ifdef CONFIG_X86_64
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#include <asm/percpu.h>
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DECLARE_PER_CPU_READ_MOSTLY(unsigned long, espfix_stack);
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DECLARE_PER_CPU_READ_MOSTLY(unsigned long, espfix_waddr);
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extern void init_espfix_bsp(void);
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extern void init_espfix_ap(void);
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#endif /* CONFIG_X86_64 */
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#endif /* _ASM_X86_ESPFIX_H */
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@ -61,6 +61,8 @@ typedef struct { pteval_t pte; } pte_t;
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#define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE)
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#define MODULES_END _AC(0xffffffffff000000, UL)
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#define MODULES_LEN (MODULES_END - MODULES_VADDR)
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#define ESPFIX_PGD_ENTRY _AC(-2, UL)
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#define ESPFIX_BASE_ADDR (ESPFIX_PGD_ENTRY << PGDIR_SHIFT)
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#define EARLY_DYNAMIC_PAGE_TABLES 64
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@ -59,6 +59,8 @@ static inline void x86_ce4100_early_setup(void) { }
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#ifndef _SETUP
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#include <asm/espfix.h>
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/*
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* This is set up by the setup-routine at boot-time
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*/
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@ -29,6 +29,7 @@ obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o
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obj-y += syscall_$(BITS).o vsyscall_gtod.o
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obj-$(CONFIG_X86_64) += vsyscall_64.o
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obj-$(CONFIG_X86_64) += vsyscall_emu_64.o
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obj-$(CONFIG_X86_ESPFIX64) += espfix_64.o
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obj-$(CONFIG_SYSFS) += ksysfs.o
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obj-y += bootflag.o e820.o
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obj-y += pci-dma.o quirks.o topology.o kdebugfs.o
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@ -527,6 +527,7 @@ syscall_exit:
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restore_all:
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TRACE_IRQS_IRET
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restore_all_notrace:
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#ifdef CONFIG_X86_ESPFIX32
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movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS
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# Warning: PT_OLDSS(%esp) contains the wrong/random values if we
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# are returning to the kernel.
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@ -537,6 +538,7 @@ restore_all_notrace:
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cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax
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CFI_REMEMBER_STATE
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je ldt_ss # returning to user-space with LDT SS
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#endif
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restore_nocheck:
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RESTORE_REGS 4 # skip orig_eax/error_code
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irq_return:
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@ -549,13 +551,9 @@ ENTRY(iret_exc)
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.previous
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_ASM_EXTABLE(irq_return,iret_exc)
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#ifdef CONFIG_X86_ESPFIX32
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CFI_RESTORE_STATE
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ldt_ss:
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larl PT_OLDSS(%esp), %eax
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jnz restore_nocheck
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testl $0x00400000, %eax # returning to 32bit stack?
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jnz restore_nocheck # allright, normal return
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#ifdef CONFIG_PARAVIRT
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/*
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* The kernel can't run on a non-flat stack if paravirt mode
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@ -597,6 +595,7 @@ ldt_ss:
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lss (%esp), %esp /* switch to espfix segment */
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CFI_ADJUST_CFA_OFFSET -8
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jmp restore_nocheck
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#endif
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CFI_ENDPROC
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ENDPROC(system_call)
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@ -704,6 +703,7 @@ END(syscall_badsys)
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* the high word of the segment base from the GDT and swiches to the
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* normal stack and adjusts ESP with the matching offset.
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*/
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#ifdef CONFIG_X86_ESPFIX32
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/* fixup the stack */
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mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */
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mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */
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@ -713,8 +713,10 @@ END(syscall_badsys)
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pushl_cfi %eax
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lss (%esp), %esp /* switch to the normal stack segment */
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CFI_ADJUST_CFA_OFFSET -8
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#endif
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.endm
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.macro UNWIND_ESPFIX_STACK
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#ifdef CONFIG_X86_ESPFIX32
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movl %ss, %eax
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/* see if on espfix stack */
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cmpw $__ESPFIX_SS, %ax
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@ -725,6 +727,7 @@ END(syscall_badsys)
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/* switch to normal stack */
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FIXUP_ESPFIX_STACK
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27:
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#endif
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.endm
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/*
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@ -1355,11 +1358,13 @@ END(debug)
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ENTRY(nmi)
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RING0_INT_FRAME
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ASM_CLAC
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#ifdef CONFIG_X86_ESPFIX32
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pushl_cfi %eax
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movl %ss, %eax
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cmpw $__ESPFIX_SS, %ax
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popl_cfi %eax
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je nmi_espfix_stack
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#endif
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cmpl $ia32_sysenter_target,(%esp)
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je nmi_stack_fixup
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pushl_cfi %eax
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@ -1399,6 +1404,7 @@ nmi_debug_stack_check:
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FIX_STACK 24, nmi_stack_correct, 1
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jmp nmi_stack_correct
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#ifdef CONFIG_X86_ESPFIX32
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nmi_espfix_stack:
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/* We have a RING0_INT_FRAME here.
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*
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@ -1420,6 +1426,7 @@ nmi_espfix_stack:
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lss 12+4(%esp), %esp # back to espfix stack
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CFI_ADJUST_CFA_OFFSET -24
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jmp irq_return
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#endif
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CFI_ENDPROC
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END(nmi)
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@ -58,6 +58,7 @@
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#include <asm/asm.h>
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#include <asm/context_tracking.h>
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#include <asm/smap.h>
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#include <asm/pgtable_types.h>
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#include <linux/err.h>
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/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
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@ -1040,8 +1041,18 @@ restore_args:
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RESTORE_ARGS 1,8,1
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irq_return:
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/*
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* Are we returning to a stack segment from the LDT? Note: in
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* 64-bit mode SS:RSP on the exception stack is always valid.
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*/
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#ifdef CONFIG_X86_ESPFIX64
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testb $4,(SS-RIP)(%rsp)
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jnz irq_return_ldt
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#endif
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irq_return_iret:
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INTERRUPT_RETURN
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_ASM_EXTABLE(irq_return, bad_iret)
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_ASM_EXTABLE(irq_return_iret, bad_iret)
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#ifdef CONFIG_PARAVIRT
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ENTRY(native_iret)
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@ -1049,6 +1060,32 @@ ENTRY(native_iret)
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_ASM_EXTABLE(native_iret, bad_iret)
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#endif
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#ifdef CONFIG_X86_ESPFIX64
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irq_return_ldt:
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pushq_cfi %rax
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pushq_cfi %rdi
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SWAPGS
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movq PER_CPU_VAR(espfix_waddr),%rdi
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movq %rax,(0*8)(%rdi) /* RAX */
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movq (2*8)(%rsp),%rax /* RIP */
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movq %rax,(1*8)(%rdi)
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movq (3*8)(%rsp),%rax /* CS */
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movq %rax,(2*8)(%rdi)
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movq (4*8)(%rsp),%rax /* RFLAGS */
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movq %rax,(3*8)(%rdi)
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movq (6*8)(%rsp),%rax /* SS */
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movq %rax,(5*8)(%rdi)
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movq (5*8)(%rsp),%rax /* RSP */
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movq %rax,(4*8)(%rdi)
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andl $0xffff0000,%eax
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popq_cfi %rdi
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orq PER_CPU_VAR(espfix_stack),%rax
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SWAPGS
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movq %rax,%rsp
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popq_cfi %rax
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jmp irq_return_iret
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#endif
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.section .fixup,"ax"
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bad_iret:
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/*
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@ -1110,9 +1147,45 @@ ENTRY(retint_kernel)
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call preempt_schedule_irq
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jmp exit_intr
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#endif
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CFI_ENDPROC
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END(common_interrupt)
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/*
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* If IRET takes a fault on the espfix stack, then we
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* end up promoting it to a doublefault. In that case,
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* modify the stack to make it look like we just entered
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* the #GP handler from user space, similar to bad_iret.
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*/
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#ifdef CONFIG_X86_ESPFIX64
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ALIGN
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__do_double_fault:
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XCPT_FRAME 1 RDI+8
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movq RSP(%rdi),%rax /* Trap on the espfix stack? */
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sarq $PGDIR_SHIFT,%rax
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cmpl $ESPFIX_PGD_ENTRY,%eax
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jne do_double_fault /* No, just deliver the fault */
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cmpl $__KERNEL_CS,CS(%rdi)
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jne do_double_fault
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movq RIP(%rdi),%rax
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cmpq $irq_return_iret,%rax
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#ifdef CONFIG_PARAVIRT
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je 1f
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cmpq $native_iret,%rax
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#endif
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jne do_double_fault /* This shouldn't happen... */
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1:
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movq PER_CPU_VAR(kernel_stack),%rax
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subq $(6*8-KERNEL_STACK_OFFSET),%rax /* Reset to original stack */
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movq %rax,RSP(%rdi)
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movq $0,(%rax) /* Missing (lost) #GP error code */
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movq $general_protection,RIP(%rdi)
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retq
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CFI_ENDPROC
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END(__do_double_fault)
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#else
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# define __do_double_fault do_double_fault
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#endif
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/*
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* End of kprobes section
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*/
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@ -1289,7 +1362,7 @@ idtentry overflow do_overflow has_error_code=0
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idtentry bounds do_bounds has_error_code=0
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idtentry invalid_op do_invalid_op has_error_code=0
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idtentry device_not_available do_device_not_available has_error_code=0
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idtentry double_fault do_double_fault has_error_code=1 paranoid=1
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idtentry double_fault __do_double_fault has_error_code=1 paranoid=1
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idtentry coprocessor_segment_overrun do_coprocessor_segment_overrun has_error_code=0
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idtentry invalid_TSS do_invalid_TSS has_error_code=1
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idtentry segment_not_present do_segment_not_present has_error_code=1
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@ -1576,7 +1649,7 @@ error_sti:
|
||||
*/
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||||
error_kernelspace:
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incl %ebx
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leaq irq_return(%rip),%rcx
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leaq irq_return_iret(%rip),%rcx
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||||
cmpq %rcx,RIP+8(%rsp)
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||||
je error_swapgs
|
||||
movl %ecx,%eax /* zero extend */
|
||||
|
||||
209
arch/x86/kernel/espfix_64.c
Normal file
209
arch/x86/kernel/espfix_64.c
Normal file
@ -0,0 +1,209 @@
|
||||
/* ----------------------------------------------------------------------- *
|
||||
*
|
||||
* Copyright 2014 Intel Corporation; author: H. Peter Anvin
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*
|
||||
* ----------------------------------------------------------------------- */
|
||||
|
||||
/*
|
||||
* The IRET instruction, when returning to a 16-bit segment, only
|
||||
* restores the bottom 16 bits of the user space stack pointer. This
|
||||
* causes some 16-bit software to break, but it also leaks kernel state
|
||||
* to user space.
|
||||
*
|
||||
* This works around this by creating percpu "ministacks", each of which
|
||||
* is mapped 2^16 times 64K apart. When we detect that the return SS is
|
||||
* on the LDT, we copy the IRET frame to the ministack and use the
|
||||
* relevant alias to return to userspace. The ministacks are mapped
|
||||
* readonly, so if the IRET fault we promote #GP to #DF which is an IST
|
||||
* vector and thus has its own stack; we then do the fixup in the #DF
|
||||
* handler.
|
||||
*
|
||||
* This file sets up the ministacks and the related page tables. The
|
||||
* actual ministack invocation is in entry_64.S.
|
||||
*/
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/init_task.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/percpu.h>
|
||||
#include <linux/gfp.h>
|
||||
#include <linux/random.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/pgalloc.h>
|
||||
#include <asm/setup.h>
|
||||
#include <asm/espfix.h>
|
||||
|
||||
/*
|
||||
* Note: we only need 6*8 = 48 bytes for the espfix stack, but round
|
||||
* it up to a cache line to avoid unnecessary sharing.
|
||||
*/
|
||||
#define ESPFIX_STACK_SIZE (8*8UL)
|
||||
#define ESPFIX_STACKS_PER_PAGE (PAGE_SIZE/ESPFIX_STACK_SIZE)
|
||||
|
||||
/* There is address space for how many espfix pages? */
|
||||
#define ESPFIX_PAGE_SPACE (1UL << (PGDIR_SHIFT-PAGE_SHIFT-16))
|
||||
|
||||
#define ESPFIX_MAX_CPUS (ESPFIX_STACKS_PER_PAGE * ESPFIX_PAGE_SPACE)
|
||||
#if CONFIG_NR_CPUS > ESPFIX_MAX_CPUS
|
||||
# error "Need more than one PGD for the ESPFIX hack"
|
||||
#endif
|
||||
|
||||
#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
|
||||
|
||||
/* This contains the *bottom* address of the espfix stack */
|
||||
DEFINE_PER_CPU_READ_MOSTLY(unsigned long, espfix_stack);
|
||||
DEFINE_PER_CPU_READ_MOSTLY(unsigned long, espfix_waddr);
|
||||
|
||||
/* Initialization mutex - should this be a spinlock? */
|
||||
static DEFINE_MUTEX(espfix_init_mutex);
|
||||
|
||||
/* Page allocation bitmap - each page serves ESPFIX_STACKS_PER_PAGE CPUs */
|
||||
#define ESPFIX_MAX_PAGES DIV_ROUND_UP(CONFIG_NR_CPUS, ESPFIX_STACKS_PER_PAGE)
|
||||
static void *espfix_pages[ESPFIX_MAX_PAGES];
|
||||
|
||||
static __page_aligned_bss pud_t espfix_pud_page[PTRS_PER_PUD]
|
||||
__aligned(PAGE_SIZE);
|
||||
|
||||
static unsigned int page_random, slot_random;
|
||||
|
||||
/*
|
||||
* This returns the bottom address of the espfix stack for a specific CPU.
|
||||
* The math allows for a non-power-of-two ESPFIX_STACK_SIZE, in which case
|
||||
* we have to account for some amount of padding at the end of each page.
|
||||
*/
|
||||
static inline unsigned long espfix_base_addr(unsigned int cpu)
|
||||
{
|
||||
unsigned long page, slot;
|
||||
unsigned long addr;
|
||||
|
||||
page = (cpu / ESPFIX_STACKS_PER_PAGE) ^ page_random;
|
||||
slot = (cpu + slot_random) % ESPFIX_STACKS_PER_PAGE;
|
||||
addr = (page << PAGE_SHIFT) + (slot * ESPFIX_STACK_SIZE);
|
||||
addr = (addr & 0xffffUL) | ((addr & ~0xffffUL) << 16);
|
||||
addr += ESPFIX_BASE_ADDR;
|
||||
return addr;
|
||||
}
|
||||
|
||||
#define PTE_STRIDE (65536/PAGE_SIZE)
|
||||
#define ESPFIX_PTE_CLONES (PTRS_PER_PTE/PTE_STRIDE)
|
||||
#define ESPFIX_PMD_CLONES PTRS_PER_PMD
|
||||
#define ESPFIX_PUD_CLONES (65536/(ESPFIX_PTE_CLONES*ESPFIX_PMD_CLONES))
|
||||
|
||||
#define PGTABLE_PROT ((_KERNPG_TABLE & ~_PAGE_RW) | _PAGE_NX)
|
||||
|
||||
static void init_espfix_random(void)
|
||||
{
|
||||
unsigned long rand;
|
||||
|
||||
/*
|
||||
* This is run before the entropy pools are initialized,
|
||||
* but this is hopefully better than nothing.
|
||||
*/
|
||||
if (!arch_get_random_long(&rand)) {
|
||||
/* The constant is an arbitrary large prime */
|
||||
rdtscll(rand);
|
||||
rand *= 0xc345c6b72fd16123UL;
|
||||
}
|
||||
|
||||
slot_random = rand % ESPFIX_STACKS_PER_PAGE;
|
||||
page_random = (rand / ESPFIX_STACKS_PER_PAGE)
|
||||
& (ESPFIX_PAGE_SPACE - 1);
|
||||
}
|
||||
|
||||
void __init init_espfix_bsp(void)
|
||||
{
|
||||
pgd_t *pgd_p;
|
||||
pteval_t ptemask;
|
||||
|
||||
ptemask = __supported_pte_mask;
|
||||
|
||||
/* Install the espfix pud into the kernel page directory */
|
||||
pgd_p = &init_level4_pgt[pgd_index(ESPFIX_BASE_ADDR)];
|
||||
pgd_populate(&init_mm, pgd_p, (pud_t *)espfix_pud_page);
|
||||
|
||||
/* Randomize the locations */
|
||||
init_espfix_random();
|
||||
|
||||
/* The rest is the same as for any other processor */
|
||||
init_espfix_ap();
|
||||
}
|
||||
|
||||
void init_espfix_ap(void)
|
||||
{
|
||||
unsigned int cpu, page;
|
||||
unsigned long addr;
|
||||
pud_t pud, *pud_p;
|
||||
pmd_t pmd, *pmd_p;
|
||||
pte_t pte, *pte_p;
|
||||
int n;
|
||||
void *stack_page;
|
||||
pteval_t ptemask;
|
||||
|
||||
/* We only have to do this once... */
|
||||
if (likely(this_cpu_read(espfix_stack)))
|
||||
return; /* Already initialized */
|
||||
|
||||
cpu = smp_processor_id();
|
||||
addr = espfix_base_addr(cpu);
|
||||
page = cpu/ESPFIX_STACKS_PER_PAGE;
|
||||
|
||||
/* Did another CPU already set this up? */
|
||||
stack_page = ACCESS_ONCE(espfix_pages[page]);
|
||||
if (likely(stack_page))
|
||||
goto done;
|
||||
|
||||
mutex_lock(&espfix_init_mutex);
|
||||
|
||||
/* Did we race on the lock? */
|
||||
stack_page = ACCESS_ONCE(espfix_pages[page]);
|
||||
if (stack_page)
|
||||
goto unlock_done;
|
||||
|
||||
ptemask = __supported_pte_mask;
|
||||
|
||||
pud_p = &espfix_pud_page[pud_index(addr)];
|
||||
pud = *pud_p;
|
||||
if (!pud_present(pud)) {
|
||||
pmd_p = (pmd_t *)__get_free_page(PGALLOC_GFP);
|
||||
pud = __pud(__pa(pmd_p) | (PGTABLE_PROT & ptemask));
|
||||
paravirt_alloc_pud(&init_mm, __pa(pmd_p) >> PAGE_SHIFT);
|
||||
for (n = 0; n < ESPFIX_PUD_CLONES; n++)
|
||||
set_pud(&pud_p[n], pud);
|
||||
}
|
||||
|
||||
pmd_p = pmd_offset(&pud, addr);
|
||||
pmd = *pmd_p;
|
||||
if (!pmd_present(pmd)) {
|
||||
pte_p = (pte_t *)__get_free_page(PGALLOC_GFP);
|
||||
pmd = __pmd(__pa(pte_p) | (PGTABLE_PROT & ptemask));
|
||||
paravirt_alloc_pmd(&init_mm, __pa(pte_p) >> PAGE_SHIFT);
|
||||
for (n = 0; n < ESPFIX_PMD_CLONES; n++)
|
||||
set_pmd(&pmd_p[n], pmd);
|
||||
}
|
||||
|
||||
pte_p = pte_offset_kernel(&pmd, addr);
|
||||
stack_page = (void *)__get_free_page(GFP_KERNEL);
|
||||
pte = __pte(__pa(stack_page) | (__PAGE_KERNEL_RO & ptemask));
|
||||
paravirt_alloc_pte(&init_mm, __pa(stack_page) >> PAGE_SHIFT);
|
||||
for (n = 0; n < ESPFIX_PTE_CLONES; n++)
|
||||
set_pte(&pte_p[n*PTE_STRIDE], pte);
|
||||
|
||||
/* Job is done for this CPU and any CPU which shares this page */
|
||||
ACCESS_ONCE(espfix_pages[page]) = stack_page;
|
||||
|
||||
unlock_done:
|
||||
mutex_unlock(&espfix_init_mutex);
|
||||
done:
|
||||
this_cpu_write(espfix_stack, addr);
|
||||
this_cpu_write(espfix_waddr, (unsigned long)stack_page
|
||||
+ (addr & ~PAGE_MASK));
|
||||
}
|
||||
@ -20,8 +20,6 @@
|
||||
#include <asm/mmu_context.h>
|
||||
#include <asm/syscalls.h>
|
||||
|
||||
int sysctl_ldt16 = 0;
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
static void flush_ldt(void *current_mm)
|
||||
{
|
||||
@ -231,16 +229,10 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* On x86-64 we do not support 16-bit segments due to
|
||||
* IRET leaking the high bits of the kernel stack address.
|
||||
*/
|
||||
#ifdef CONFIG_X86_64
|
||||
if (!ldt_info.seg_32bit && !sysctl_ldt16) {
|
||||
if (!IS_ENABLED(CONFIG_X86_16BIT) && !ldt_info.seg_32bit) {
|
||||
error = -EINVAL;
|
||||
goto out_unlock;
|
||||
}
|
||||
#endif
|
||||
|
||||
fill_ldt(&ldt, &ldt_info);
|
||||
if (oldmode)
|
||||
|
||||
@ -243,6 +243,13 @@ static void notrace start_secondary(void *unused)
|
||||
*/
|
||||
check_tsc_sync_target();
|
||||
|
||||
/*
|
||||
* Enable the espfix hack for this CPU
|
||||
*/
|
||||
#ifdef CONFIG_X86_ESPFIX64
|
||||
init_espfix_ap();
|
||||
#endif
|
||||
|
||||
/*
|
||||
* We need to hold vector_lock so there the set of online cpus
|
||||
* does not change while we are assigning vectors to cpus. Holding
|
||||
|
||||
@ -30,12 +30,14 @@ struct pg_state {
|
||||
unsigned long start_address;
|
||||
unsigned long current_address;
|
||||
const struct addr_marker *marker;
|
||||
unsigned long lines;
|
||||
bool to_dmesg;
|
||||
};
|
||||
|
||||
struct addr_marker {
|
||||
unsigned long start_address;
|
||||
const char *name;
|
||||
unsigned long max_lines;
|
||||
};
|
||||
|
||||
/* indices for address_markers; keep sync'd w/ address_markers below */
|
||||
@ -46,6 +48,7 @@ enum address_markers_idx {
|
||||
LOW_KERNEL_NR,
|
||||
VMALLOC_START_NR,
|
||||
VMEMMAP_START_NR,
|
||||
ESPFIX_START_NR,
|
||||
HIGH_KERNEL_NR,
|
||||
MODULES_VADDR_NR,
|
||||
MODULES_END_NR,
|
||||
@ -68,6 +71,7 @@ static struct addr_marker address_markers[] = {
|
||||
{ PAGE_OFFSET, "Low Kernel Mapping" },
|
||||
{ VMALLOC_START, "vmalloc() Area" },
|
||||
{ VMEMMAP_START, "Vmemmap" },
|
||||
{ ESPFIX_BASE_ADDR, "ESPfix Area", 16 },
|
||||
{ __START_KERNEL_map, "High Kernel Mapping" },
|
||||
{ MODULES_VADDR, "Modules" },
|
||||
{ MODULES_END, "End Modules" },
|
||||
@ -182,7 +186,7 @@ static void note_page(struct seq_file *m, struct pg_state *st,
|
||||
pgprot_t new_prot, int level)
|
||||
{
|
||||
pgprotval_t prot, cur;
|
||||
static const char units[] = "KMGTPE";
|
||||
static const char units[] = "BKMGTPE";
|
||||
|
||||
/*
|
||||
* If we have a "break" in the series, we need to flush the state that
|
||||
@ -197,6 +201,7 @@ static void note_page(struct seq_file *m, struct pg_state *st,
|
||||
st->current_prot = new_prot;
|
||||
st->level = level;
|
||||
st->marker = address_markers;
|
||||
st->lines = 0;
|
||||
pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
|
||||
st->marker->name);
|
||||
} else if (prot != cur || level != st->level ||
|
||||
@ -208,17 +213,24 @@ static void note_page(struct seq_file *m, struct pg_state *st,
|
||||
/*
|
||||
* Now print the actual finished series
|
||||
*/
|
||||
pt_dump_seq_printf(m, st->to_dmesg, "0x%0*lx-0x%0*lx ",
|
||||
width, st->start_address,
|
||||
width, st->current_address);
|
||||
if (!st->marker->max_lines ||
|
||||
st->lines < st->marker->max_lines) {
|
||||
pt_dump_seq_printf(m, st->to_dmesg,
|
||||
"0x%0*lx-0x%0*lx ",
|
||||
width, st->start_address,
|
||||
width, st->current_address);
|
||||
|
||||
delta = (st->current_address - st->start_address) >> 10;
|
||||
while (!(delta & 1023) && unit[1]) {
|
||||
delta >>= 10;
|
||||
unit++;
|
||||
delta = st->current_address - st->start_address;
|
||||
while (!(delta & 1023) && unit[1]) {
|
||||
delta >>= 10;
|
||||
unit++;
|
||||
}
|
||||
pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ",
|
||||
delta, *unit);
|
||||
printk_prot(m, st->current_prot, st->level,
|
||||
st->to_dmesg);
|
||||
}
|
||||
pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ", delta, *unit);
|
||||
printk_prot(m, st->current_prot, st->level, st->to_dmesg);
|
||||
st->lines++;
|
||||
|
||||
/*
|
||||
* We print markers for special areas of address space,
|
||||
@ -226,7 +238,17 @@ static void note_page(struct seq_file *m, struct pg_state *st,
|
||||
* This helps in the interpretation.
|
||||
*/
|
||||
if (st->current_address >= st->marker[1].start_address) {
|
||||
if (st->marker->max_lines &&
|
||||
st->lines > st->marker->max_lines) {
|
||||
unsigned long nskip =
|
||||
st->lines - st->marker->max_lines;
|
||||
pt_dump_seq_printf(m, st->to_dmesg,
|
||||
"... %lu entr%s skipped ... \n",
|
||||
nskip,
|
||||
nskip == 1 ? "y" : "ies");
|
||||
}
|
||||
st->marker++;
|
||||
st->lines = 0;
|
||||
pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
|
||||
st->marker->name);
|
||||
}
|
||||
|
||||
@ -39,7 +39,6 @@
|
||||
#ifdef CONFIG_X86_64
|
||||
#define vdso_enabled sysctl_vsyscall32
|
||||
#define arch_setup_additional_pages syscall32_setup_pages
|
||||
extern int sysctl_ldt16;
|
||||
#endif
|
||||
|
||||
/*
|
||||
@ -250,13 +249,6 @@ 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
|
||||
},
|
||||
{}
|
||||
};
|
||||
|
||||
|
||||
@ -616,6 +616,10 @@ asmlinkage __visible void __init start_kernel(void)
|
||||
#ifdef CONFIG_X86
|
||||
if (efi_enabled(EFI_RUNTIME_SERVICES))
|
||||
efi_enter_virtual_mode();
|
||||
#endif
|
||||
#ifdef CONFIG_X86_ESPFIX64
|
||||
/* Should be run before the first non-init thread is created */
|
||||
init_espfix_bsp();
|
||||
#endif
|
||||
thread_info_cache_init();
|
||||
cred_init();
|
||||
|
||||
Loading…
Reference in New Issue
Block a user