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Message-Id: <1486039824-8470-1-git-send-email-kpark3469@gmail.com> Date: Thu, 2 Feb 2017 16:50:22 +0400 From: kpark3469@...il.com To: kernel-hardening@...ts.openwall.com Cc: catalin.marinas@....com, keescook@...omium.org, will.deacon@....com, mark.rutland@....com, james.morse@....com, panand@...hat.com, keun-o.park@...kmatter.ae Subject: [PATCH v2 1/3] usercopy: create usercopy.h and move enum stack_type From: Sahara <keun-o.park@...kmatter.ae> This patch creates linux/usercopy.h and moves the enum which is only used in usercopy.c so as to make it usable to x86 and other architecture's thread_info.h, which may have arch_within_stack_frames(). Signed-off-by: Sahara <keun-o.park@...kmatter.ae> Suggested-by: James Morse <james.morse@....com> --- arch/x86/include/asm/thread_info.h | 20 +++++++++++--------- include/linux/usercopy.h | 11 +++++++++++ mm/usercopy.c | 8 +------- 3 files changed, 23 insertions(+), 16 deletions(-) create mode 100644 include/linux/usercopy.h diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index ad6f5eb0..c991126 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -51,6 +51,7 @@ struct task_struct; #include <asm/cpufeature.h> #include <linux/atomic.h> +#include <linux/usercopy.h> struct thread_info { unsigned long flags; /* low level flags */ @@ -168,13 +169,13 @@ static inline unsigned long current_stack_pointer(void) * entirely contained by a single stack frame. * * Returns: - * 1 if within a frame - * -1 if placed across a frame boundary (or outside stack) - * 0 unable to determine (no frame pointers, etc) + * GOOD_FRAME if within a frame + * BAD_STACK if placed across a frame boundary (or outside stack) + * NOT_STACK unable to determine (no frame pointers, etc) */ -static inline int arch_within_stack_frames(const void * const stack, - const void * const stackend, - const void *obj, unsigned long len) +static inline enum stack_type arch_within_stack_frames(const void * const stack, + const void * const stackend, + const void *obj, unsigned long len) { #if defined(CONFIG_FRAME_POINTER) const void *frame = NULL; @@ -197,13 +198,14 @@ static inline int arch_within_stack_frames(const void * const stack, * the copy as invalid. */ if (obj + len <= frame) - return obj >= oldframe + 2 * sizeof(void *) ? 1 : -1; + return obj >= oldframe + 2 * sizeof(void *) ? + GOOD_FRAME : BAD_STACK; oldframe = frame; frame = *(const void * const *)frame; } - return -1; + return BAD_STACK; #else - return 0; + return NOT_STACK; #endif } diff --git a/include/linux/usercopy.h b/include/linux/usercopy.h new file mode 100644 index 0000000..974859e --- /dev/null +++ b/include/linux/usercopy.h @@ -0,0 +1,11 @@ +#ifndef __LINUX_USERCOPY_H +#define __LINUX_USERCOPY_H + +enum stack_type { + BAD_STACK = -1, + NOT_STACK = 0, + GOOD_FRAME, + GOOD_STACK, +}; + +#endif diff --git a/mm/usercopy.c b/mm/usercopy.c index 3c8da0a..ee7bced 100644 --- a/mm/usercopy.c +++ b/mm/usercopy.c @@ -16,15 +16,9 @@ #include <linux/mm.h> #include <linux/slab.h> +#include <linux/usercopy.h> #include <asm/sections.h> -enum { - BAD_STACK = -1, - NOT_STACK = 0, - GOOD_FRAME, - GOOD_STACK, -}; - /* * Checks if a given pointer and length is contained by the current * stack frame (if possible). -- 2.7.4
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