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[PATCH] m32r: security fix of {get,put}_user macros
Update {get,put}_user macros for m32r kernel.
- Modify get_user to use __get_user_asm macro, instead of __get_user_x macro.
- Remove arch/m32r/lib/{get,put}user.S.
- Some cosmetic updates.
I would like to thank NIIBE Yutaka for his reporting about the m32r kernel's
security problem in {get,put}_user macros.
There were no address checking for user space access in {get,put}_user macros.
;-)
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Cc: NIIBE Yutaka <gniibe@fsij.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hirokazu Takata
Linus Torvalds
parent
7c1c4e5418
commit
04dfd0de4e
@ -38,10 +38,6 @@ EXPORT_SYMBOL(__udelay);
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EXPORT_SYMBOL(__delay);
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EXPORT_SYMBOL(__const_udelay);
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EXPORT_SYMBOL(__get_user_1);
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EXPORT_SYMBOL(__get_user_2);
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EXPORT_SYMBOL(__get_user_4);
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EXPORT_SYMBOL(strpbrk);
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EXPORT_SYMBOL(strstr);
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@ -2,6 +2,6 @@
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# Makefile for M32R-specific library files..
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#
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lib-y := checksum.o ashxdi3.o memset.o memcpy.o getuser.o \
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putuser.o delay.o strlen.o usercopy.o csum_partial_copy.o
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lib-y := checksum.o ashxdi3.o memset.o memcpy.o \
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delay.o strlen.o usercopy.o csum_partial_copy.o
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@ -1,88 +0,0 @@
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/*
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* __get_user functions.
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*
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* (C) Copyright 2001 Hirokazu Takata
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*
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* These functions have a non-standard call interface
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* to make them more efficient, especially as they
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* return an error value in addition to the "real"
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* return value.
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*/
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#include <linux/config.h>
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/*
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* __get_user_X
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*
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* Inputs: r0 contains the address
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*
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* Outputs: r0 is error code (0 or -EFAULT)
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* r1 contains zero-extended value
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*
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* These functions should not modify any other registers,
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* as they get called from within inline assembly.
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*/
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#ifdef CONFIG_ISA_DUAL_ISSUE
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.text
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.balign 4
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.globl __get_user_1
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__get_user_1:
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1: ldub r1, @r0 || ldi r0, #0
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jmp r14
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.balign 4
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.globl __get_user_2
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__get_user_2:
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2: lduh r1, @r0 || ldi r0, #0
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jmp r14
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.balign 4
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.globl __get_user_4
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__get_user_4:
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3: ld r1, @r0 || ldi r0, #0
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jmp r14
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bad_get_user:
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ldi r1, #0 || ldi r0, #-14
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jmp r14
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#else /* not CONFIG_ISA_DUAL_ISSUE */
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.text
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.balign 4
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.globl __get_user_1
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__get_user_1:
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1: ldub r1, @r0
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ldi r0, #0
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jmp r14
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.balign 4
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.globl __get_user_2
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__get_user_2:
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2: lduh r1, @r0
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ldi r0, #0
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jmp r14
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.balign 4
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.globl __get_user_4
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__get_user_4:
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3: ld r1, @r0
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ldi r0, #0
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jmp r14
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bad_get_user:
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ldi r1, #0
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ldi r0, #-14
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jmp r14
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#endif /* not CONFIG_ISA_DUAL_ISSUE */
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.section __ex_table,"a"
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.long 1b,bad_get_user
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.long 2b,bad_get_user
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.long 3b,bad_get_user
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.previous
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.end
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@ -1,84 +0,0 @@
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/*
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* __put_user functions.
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*
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* (C) Copyright 1998 Linus Torvalds
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* (C) Copyright 2001 Hirokazu Takata
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*
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* These functions have a non-standard call interface
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* to make them more efficient.
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*/
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#include <linux/config.h>
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/*
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* __put_user_X
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*
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* Inputs: r0 contains the address
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* r1 contains the value
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*
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* Outputs: r0 is error code (0 or -EFAULT)
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* r1 is corrupted (will contain "current_task").
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*
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* These functions should not modify any other registers,
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* as they get called from within inline assembly.
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*/
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#ifdef CONFIG_ISA_DUAL_ISSUE
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.text
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.balign 4
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.globl __put_user_1
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__put_user_1:
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1: stb r1, @r0 || ldi r0, #0
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jmp r14
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.balign 4
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.globl __put_user_2
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__put_user_2:
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2: sth r1, @r0 || ldi r0, #0
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jmp r14
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.balign 4
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.globl __put_user_4
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__put_user_4:
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3: st r1, @r0 || ldi r0, #0
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jmp r14
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bad_put_user:
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ldi r0, #-14 || jmp r14
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#else /* not CONFIG_ISA_DUAL_ISSUE */
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.text
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.balign 4
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.globl __put_user_1
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__put_user_1:
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1: stb r1, @r0
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ldi r0, #0
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jmp r14
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.balign 4
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.globl __put_user_2
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__put_user_2:
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2: sth r1, @r0
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ldi r0, #0
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jmp r14
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.balign 4
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.globl __put_user_4
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__put_user_4:
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3: st r1, @r0
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ldi r0, #0
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jmp r14
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bad_put_user:
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ldi r0, #-14
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jmp r14
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#endif /* not CONFIG_ISA_DUAL_ISSUE */
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.section __ex_table,"a"
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.long 1b,bad_put_user
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.long 2b,bad_put_user
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.long 3b,bad_put_user
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.previous
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@ -5,17 +5,9 @@
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* linux/include/asm-m32r/uaccess.h
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*
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* M32R version.
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* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
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* Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org>
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*/
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#undef UACCESS_DEBUG
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#ifdef UACCESS_DEBUG
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#define UAPRINTK(args...) printk(args)
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#else
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#define UAPRINTK(args...)
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#endif /* UACCESS_DEBUG */
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/*
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* User space memory access functions
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*/
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@ -38,27 +30,29 @@
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#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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#ifdef CONFIG_MMU
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
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#else
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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#define USER_DS MAKE_MM_SEG(0xFFFFFFFF)
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#endif /* CONFIG_MMU */
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#define get_ds() (KERNEL_DS)
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#ifdef CONFIG_MMU
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#define get_fs() (current_thread_info()->addr_limit)
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#define set_fs(x) (current_thread_info()->addr_limit = (x))
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#else
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#else /* not CONFIG_MMU */
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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#define USER_DS MAKE_MM_SEG(0xFFFFFFFF)
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#define get_ds() (KERNEL_DS)
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static inline mm_segment_t get_fs(void)
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{
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return USER_DS;
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return USER_DS;
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}
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static inline void set_fs(mm_segment_t s)
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{
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}
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#endif /* CONFIG_MMU */
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#endif /* not CONFIG_MMU */
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#define segment_eq(a,b) ((a).seg == (b).seg)
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@ -83,9 +77,9 @@ static inline void set_fs(mm_segment_t s)
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" subx %0, %0\n" \
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" cmpu %4, %1\n" \
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" subx %0, %5\n" \
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: "=&r"(flag), "=r"(sum) \
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: "1"(addr), "r"((int)(size)), \
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"r"(current_thread_info()->addr_limit.seg), "r"(0) \
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: "=&r" (flag), "=r" (sum) \
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: "1" (addr), "r" ((int)(size)), \
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"r" (current_thread_info()->addr_limit.seg), "r" (0) \
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: "cbit" ); \
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flag; })
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@ -113,10 +107,10 @@ static inline void set_fs(mm_segment_t s)
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#else
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static inline int access_ok(int type, const void *addr, unsigned long size)
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{
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extern unsigned long memory_start, memory_end;
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unsigned long val = (unsigned long)addr;
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extern unsigned long memory_start, memory_end;
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unsigned long val = (unsigned long)addr;
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return ((val >= memory_start) && ((val + size) < memory_end));
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return ((val >= memory_start) && ((val + size) < memory_end));
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}
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#endif /* CONFIG_MMU */
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@ -155,39 +149,6 @@ extern int fixup_exception(struct pt_regs *regs);
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* accesses to the same area of user memory).
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*/
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extern void __get_user_1(void);
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extern void __get_user_2(void);
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extern void __get_user_4(void);
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#ifndef MODULE
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#define __get_user_x(size,ret,x,ptr) \
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__asm__ __volatile__( \
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" mv r0, %0\n" \
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" mv r1, %1\n" \
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" bl __get_user_" #size "\n" \
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" mv %0, r0\n" \
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" mv %1, r1\n" \
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: "=r"(ret), "=r"(x) \
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: "0"(ptr) \
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: "r0", "r1", "r14" )
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#else /* MODULE */
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/*
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* Use "jl" instead of "bl" for MODULE
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*/
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#define __get_user_x(size,ret,x,ptr) \
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__asm__ __volatile__( \
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" mv r0, %0\n" \
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" mv r1, %1\n" \
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" seth lr, #high(__get_user_" #size ")\n" \
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" or3 lr, lr, #low(__get_user_" #size ")\n" \
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" jl lr\n" \
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" mv %0, r0\n" \
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" mv %1, r1\n" \
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: "=r"(ret), "=r"(x) \
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: "0"(ptr) \
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: "r0", "r1", "r14" )
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#endif
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/* Careful: we have to cast the result to the type of the pointer for sign
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reasons */
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/**
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@ -208,20 +169,7 @@ extern void __get_user_4(void);
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* On error, the variable @x is set to zero.
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*/
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#define get_user(x,ptr) \
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({ int __ret_gu; \
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unsigned long __val_gu; \
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__chk_user_ptr(ptr); \
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switch(sizeof (*(ptr))) { \
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case 1: __get_user_x(1,__ret_gu,__val_gu,ptr); break; \
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case 2: __get_user_x(2,__ret_gu,__val_gu,ptr); break; \
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case 4: __get_user_x(4,__ret_gu,__val_gu,ptr); break; \
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default: __get_user_x(X,__ret_gu,__val_gu,ptr); break; \
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} \
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(x) = (__typeof__(*(ptr)))__val_gu; \
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__ret_gu; \
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})
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extern void __put_user_bad(void);
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__get_user_check((x),(ptr),sizeof(*(ptr)))
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/**
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* put_user: - Write a simple value into user space.
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@ -240,8 +188,7 @@ extern void __put_user_bad(void);
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* Returns zero on success, or -EFAULT on error.
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*/
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#define put_user(x,ptr) \
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__put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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__put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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/**
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* __get_user: - Get a simple variable from user space, with less checking.
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@ -264,8 +211,64 @@ extern void __put_user_bad(void);
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* On error, the variable @x is set to zero.
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*/
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#define __get_user(x,ptr) \
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__get_user_nocheck((x),(ptr),sizeof(*(ptr)))
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__get_user_nocheck((x),(ptr),sizeof(*(ptr)))
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#define __get_user_nocheck(x,ptr,size) \
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({ \
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long __gu_err = 0; \
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unsigned long __gu_val; \
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might_sleep(); \
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__get_user_size(__gu_val,(ptr),(size),__gu_err); \
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(x) = (__typeof__(*(ptr)))__gu_val; \
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__gu_err; \
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})
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#define __get_user_check(x,ptr,size) \
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({ \
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long __gu_err = -EFAULT; \
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unsigned long __gu_val = 0; \
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const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
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might_sleep(); \
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if (access_ok(VERIFY_READ,__gu_addr,size)) \
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__get_user_size(__gu_val,__gu_addr,(size),__gu_err); \
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(x) = (__typeof__(*(ptr)))__gu_val; \
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__gu_err; \
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})
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extern long __get_user_bad(void);
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#define __get_user_size(x,ptr,size,retval) \
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do { \
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retval = 0; \
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__chk_user_ptr(ptr); \
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switch (size) { \
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case 1: __get_user_asm(x,ptr,retval,"ub"); break; \
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case 2: __get_user_asm(x,ptr,retval,"uh"); break; \
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case 4: __get_user_asm(x,ptr,retval,""); break; \
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default: (x) = __get_user_bad(); \
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} \
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} while (0)
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#define __get_user_asm(x, addr, err, itype) \
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__asm__ __volatile__( \
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" .fillinsn\n" \
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"1: ld"itype" %1,@%2\n" \
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" .fillinsn\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"3: ldi %0,%3\n" \
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" seth r14,#high(2b)\n" \
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" or3 r14,r14,#low(2b)\n" \
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" jmp r14\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 1b,3b\n" \
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".previous" \
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: "=&r" (err), "=&r" (x) \
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: "r" (addr), "i" (-EFAULT), "0" (err) \
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: "r14", "memory")
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/**
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* __put_user: - Write a simple value into user space, with less checking.
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@ -287,11 +290,13 @@ extern void __put_user_bad(void);
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* Returns zero on success, or -EFAULT on error.
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*/
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#define __put_user(x,ptr) \
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__put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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__put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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#define __put_user_nocheck(x,ptr,size) \
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({ \
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long __pu_err; \
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might_sleep(); \
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__put_user_size((x),(ptr),(size),__pu_err); \
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__pu_err; \
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})
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@ -308,28 +313,28 @@ extern void __put_user_bad(void);
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})
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#if defined(__LITTLE_ENDIAN__)
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#define __put_user_u64(x, addr, err) \
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__asm__ __volatile__( \
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" .fillinsn\n" \
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"1: st %L1,@%2\n" \
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" .fillinsn\n" \
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"2: st %H1,@(4,%2)\n" \
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" .fillinsn\n" \
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"3:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"4: ldi %0,%3\n" \
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" seth r14,#high(3b)\n" \
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" or3 r14,r14,#low(3b)\n" \
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" jmp r14\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 1b,4b\n" \
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" .long 2b,4b\n" \
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".previous" \
|
||||
: "=&r"(err) \
|
||||
: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err) \
|
||||
#define __put_user_u64(x, addr, err) \
|
||||
__asm__ __volatile__( \
|
||||
" .fillinsn\n" \
|
||||
"1: st %L1,@%2\n" \
|
||||
" .fillinsn\n" \
|
||||
"2: st %H1,@(4,%2)\n" \
|
||||
" .fillinsn\n" \
|
||||
"3:\n" \
|
||||
".section .fixup,\"ax\"\n" \
|
||||
" .balign 4\n" \
|
||||
"4: ldi %0,%3\n" \
|
||||
" seth r14,#high(3b)\n" \
|
||||
" or3 r14,r14,#low(3b)\n" \
|
||||
" jmp r14\n" \
|
||||
".previous\n" \
|
||||
".section __ex_table,\"a\"\n" \
|
||||
" .balign 4\n" \
|
||||
" .long 1b,4b\n" \
|
||||
" .long 2b,4b\n" \
|
||||
".previous" \
|
||||
: "=&r" (err) \
|
||||
: "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \
|
||||
: "r14", "memory")
|
||||
|
||||
#elif defined(__BIG_ENDIAN__)
|
||||
@ -353,13 +358,15 @@ extern void __put_user_bad(void);
|
||||
" .long 1b,4b\n" \
|
||||
" .long 2b,4b\n" \
|
||||
".previous" \
|
||||
: "=&r"(err) \
|
||||
: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err) \
|
||||
: "=&r" (err) \
|
||||
: "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \
|
||||
: "r14", "memory")
|
||||
#else
|
||||
#error no endian defined
|
||||
#endif
|
||||
|
||||
extern void __put_user_bad(void);
|
||||
|
||||
#define __put_user_size(x,ptr,size,retval) \
|
||||
do { \
|
||||
retval = 0; \
|
||||
@ -398,52 +405,8 @@ struct __large_struct { unsigned long buf[100]; };
|
||||
" .balign 4\n" \
|
||||
" .long 1b,3b\n" \
|
||||
".previous" \
|
||||
: "=&r"(err) \
|
||||
: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err) \
|
||||
: "r14", "memory")
|
||||
|
||||
#define __get_user_nocheck(x,ptr,size) \
|
||||
({ \
|
||||
long __gu_err; \
|
||||
unsigned long __gu_val; \
|
||||
__get_user_size(__gu_val,(ptr),(size),__gu_err); \
|
||||
(x) = (__typeof__(*(ptr)))__gu_val; \
|
||||
__gu_err; \
|
||||
})
|
||||
|
||||
extern long __get_user_bad(void);
|
||||
|
||||
#define __get_user_size(x,ptr,size,retval) \
|
||||
do { \
|
||||
retval = 0; \
|
||||
__chk_user_ptr(ptr); \
|
||||
switch (size) { \
|
||||
case 1: __get_user_asm(x,ptr,retval,"ub"); break; \
|
||||
case 2: __get_user_asm(x,ptr,retval,"uh"); break; \
|
||||
case 4: __get_user_asm(x,ptr,retval,""); break; \
|
||||
default: (x) = __get_user_bad(); \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
#define __get_user_asm(x, addr, err, itype) \
|
||||
__asm__ __volatile__( \
|
||||
" .fillinsn\n" \
|
||||
"1: ld"itype" %1,@%2\n" \
|
||||
" .fillinsn\n" \
|
||||
"2:\n" \
|
||||
".section .fixup,\"ax\"\n" \
|
||||
" .balign 4\n" \
|
||||
"3: ldi %0,%3\n" \
|
||||
" seth r14,#high(2b)\n" \
|
||||
" or3 r14,r14,#low(2b)\n" \
|
||||
" jmp r14\n" \
|
||||
".previous\n" \
|
||||
".section __ex_table,\"a\"\n" \
|
||||
" .balign 4\n" \
|
||||
" .long 1b,3b\n" \
|
||||
".previous" \
|
||||
: "=&r"(err), "=&r"(x) \
|
||||
: "r"(addr), "i"(-EFAULT), "0"(err) \
|
||||
: "=&r" (err) \
|
||||
: "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \
|
||||
: "r14", "memory")
|
||||
|
||||
/*
|
||||
@ -453,7 +416,6 @@ do { \
|
||||
* anything, so this is accurate.
|
||||
*/
|
||||
|
||||
|
||||
/*
|
||||
* Copy To/From Userspace
|
||||
*/
|
||||
@ -511,8 +473,9 @@ do { \
|
||||
" .long 2b,9b\n" \
|
||||
" .long 3b,9b\n" \
|
||||
".previous\n" \
|
||||
: "=&r"(__dst), "=&r"(__src), "=&r"(size), "=&r"(__c) \
|
||||
: "0"(to), "1"(from), "2"(size), "3"(size / 4) \
|
||||
: "=&r" (__dst), "=&r" (__src), "=&r" (size), \
|
||||
"=&r" (__c) \
|
||||
: "0" (to), "1" (from), "2" (size), "3" (size / 4) \
|
||||
: "r14", "memory"); \
|
||||
} while (0)
|
||||
|
||||
@ -573,8 +536,9 @@ do { \
|
||||
" .long 2b,7b\n" \
|
||||
" .long 3b,7b\n" \
|
||||
".previous\n" \
|
||||
: "=&r"(__dst), "=&r"(__src), "=&r"(size), "=&r"(__c) \
|
||||
: "0"(to), "1"(from), "2"(size), "3"(size / 4) \
|
||||
: "=&r" (__dst), "=&r" (__src), "=&r" (size), \
|
||||
"=&r" (__c) \
|
||||
: "0" (to), "1" (from), "2" (size), "3" (size / 4) \
|
||||
: "r14", "memory"); \
|
||||
} while (0)
|
||||
|
||||
@ -676,7 +640,7 @@ unsigned long __generic_copy_from_user(void *, const void __user *, unsigned lon
|
||||
#define copy_from_user(to,from,n) \
|
||||
({ \
|
||||
might_sleep(); \
|
||||
__generic_copy_from_user((to),(from),(n)); \
|
||||
__generic_copy_from_user((to),(from),(n)); \
|
||||
})
|
||||
|
||||
long __must_check strncpy_from_user(char *dst, const char __user *src,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user