diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0013-kaiser-tidied-up-asm-kaiser.h-somewhat.patch')
-rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0013-kaiser-tidied-up-asm-kaiser.h-somewhat.patch | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0013-kaiser-tidied-up-asm-kaiser.h-somewhat.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0013-kaiser-tidied-up-asm-kaiser.h-somewhat.patch deleted file mode 100644 index 61cff38e..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0013-kaiser-tidied-up-asm-kaiser.h-somewhat.patch +++ /dev/null @@ -1,107 +0,0 @@ -From 7bb8f481c84ef1755e442700593f0ef10857c108 Mon Sep 17 00:00:00 2001 -From: Hugh Dickins <hughd@google.com> -Date: Sun, 3 Sep 2017 19:18:07 -0700 -Subject: [PATCH 013/103] kaiser: tidied up asm/kaiser.h somewhat - -Mainly deleting a surfeit of blank lines, and reflowing header comment. - -Signed-off-by: Hugh Dickins <hughd@google.com> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/include/asm/kaiser.h | 32 +++++++++++++------------------- - 1 file changed, 13 insertions(+), 19 deletions(-) - -diff --git a/arch/x86/include/asm/kaiser.h b/arch/x86/include/asm/kaiser.h -index 0703f48..7394ba9 100644 ---- a/arch/x86/include/asm/kaiser.h -+++ b/arch/x86/include/asm/kaiser.h -@@ -1,15 +1,17 @@ - #ifndef _ASM_X86_KAISER_H - #define _ASM_X86_KAISER_H -- --/* This file includes the definitions for the KAISER feature. -- * KAISER is a counter measure against x86_64 side channel attacks on the kernel virtual memory. -- * It has a shodow-pgd for every process. the shadow-pgd has a minimalistic kernel-set mapped, -- * but includes the whole user memory. Within a kernel context switch, or when an interrupt is handled, -- * the pgd is switched to the normal one. When the system switches to user mode, the shadow pgd is enabled. -- * By this, the virtual memory chaches are freed, and the user may not attack the whole kernel memory. -+/* -+ * This file includes the definitions for the KAISER feature. -+ * KAISER is a counter measure against x86_64 side channel attacks on -+ * the kernel virtual memory. It has a shadow pgd for every process: the -+ * shadow pgd has a minimalistic kernel-set mapped, but includes the whole -+ * user memory. Within a kernel context switch, or when an interrupt is handled, -+ * the pgd is switched to the normal one. When the system switches to user mode, -+ * the shadow pgd is enabled. By this, the virtual memory caches are freed, -+ * and the user may not attack the whole kernel memory. - * -- * A minimalistic kernel mapping holds the parts needed to be mapped in user mode, as the entry/exit functions -- * of the user space, or the stacks. -+ * A minimalistic kernel mapping holds the parts needed to be mapped in user -+ * mode, such as the entry/exit functions of the user space, or the stacks. - */ - #ifdef __ASSEMBLY__ - #ifdef CONFIG_KAISER -@@ -48,13 +50,10 @@ _SWITCH_TO_KERNEL_CR3 %rax - movq PER_CPU_VAR(unsafe_stack_register_backup), %rax - .endm - -- - .macro SWITCH_USER_CR3_NO_STACK -- - movq %rax, PER_CPU_VAR(unsafe_stack_register_backup) - _SWITCH_TO_USER_CR3 %rax - movq PER_CPU_VAR(unsafe_stack_register_backup), %rax -- - .endm - - #else /* CONFIG_KAISER */ -@@ -72,7 +71,6 @@ movq PER_CPU_VAR(unsafe_stack_register_backup), %rax - - #else /* __ASSEMBLY__ */ - -- - #ifdef CONFIG_KAISER - /* - * Upon kernel/user mode switch, it may happen that the address -@@ -80,7 +78,6 @@ movq PER_CPU_VAR(unsafe_stack_register_backup), %rax - * stored. To change the address space, another register is - * needed. A register therefore has to be stored/restored. - */ -- - DECLARE_PER_CPU_USER_MAPPED(unsigned long, unsafe_stack_register_backup); - - /** -@@ -95,7 +92,6 @@ DECLARE_PER_CPU_USER_MAPPED(unsigned long, unsafe_stack_register_backup); - */ - extern int kaiser_add_mapping(unsigned long addr, unsigned long size, unsigned long flags); - -- - /** - * kaiser_remove_mapping - unmap a virtual memory part of the shadow mapping - * @addr: the start address of the range -@@ -104,12 +100,12 @@ extern int kaiser_add_mapping(unsigned long addr, unsigned long size, unsigned l - extern void kaiser_remove_mapping(unsigned long start, unsigned long size); - - /** -- * kaiser_initialize_mapping - Initalize the shadow mapping -+ * kaiser_init - Initialize the shadow mapping - * - * Most parts of the shadow mapping can be mapped upon boot - * time. Only per-process things like the thread stacks - * or a new LDT have to be mapped at runtime. These boot- -- * time mappings are permanent and nevertunmapped. -+ * time mappings are permanent and never unmapped. - */ - extern void kaiser_init(void); - -@@ -117,6 +113,4 @@ extern void kaiser_init(void); - - #endif /* __ASSEMBLY */ - -- -- - #endif /* _ASM_X86_KAISER_H */ --- -2.7.4 - |