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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 2006-04-10 22:53:20 -07:00 committed by Linus Torvalds
parent 7c1c4e5418
commit 04dfd0de4e
5 changed files with 117 additions and 329 deletions
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4
arch/m32r/kernel/m32r_ksyms.c
View File

@ -38,10 +38,6 @@ EXPORT_SYMBOL(__udelay);
EXPORT_SYMBOL(__delay);
EXPORT_SYMBOL(__const_udelay);
EXPORT_SYMBOL(__get_user_1);
EXPORT_SYMBOL(__get_user_2);
EXPORT_SYMBOL(__get_user_4);
EXPORT_SYMBOL(strpbrk);
EXPORT_SYMBOL(strstr);

4
arch/m32r/lib/Makefile
View File

@ -2,6 +2,6 @@
# Makefile for M32R-specific library files..
#
lib-y := checksum.o ashxdi3.o memset.o memcpy.o getuser.o \
putuser.o delay.o strlen.o usercopy.o csum_partial_copy.o
lib-y := checksum.o ashxdi3.o memset.o memcpy.o \
delay.o strlen.o usercopy.o csum_partial_copy.o

88
arch/m32r/lib/getuser.S
View File

@ -1,88 +0,0 @@
/*
* __get_user functions.
*
* (C) Copyright 2001 Hirokazu Takata
*
* These functions have a non-standard call interface
* to make them more efficient, especially as they
* return an error value in addition to the "real"
* return value.
*/
#include <linux/config.h>
/*
* __get_user_X
*
* Inputs: r0 contains the address
*
* Outputs: r0 is error code (0 or -EFAULT)
* r1 contains zero-extended value
*
* These functions should not modify any other registers,
* as they get called from within inline assembly.
*/
#ifdef CONFIG_ISA_DUAL_ISSUE
.text
.balign 4
.globl __get_user_1
__get_user_1:
1: ldub r1, @r0 || ldi r0, #0
jmp r14
.balign 4
.globl __get_user_2
__get_user_2:
2: lduh r1, @r0 || ldi r0, #0
jmp r14
.balign 4
.globl __get_user_4
__get_user_4:
3: ld r1, @r0 || ldi r0, #0
jmp r14
bad_get_user:
ldi r1, #0 || ldi r0, #-14
jmp r14
#else /* not CONFIG_ISA_DUAL_ISSUE */
.text
.balign 4
.globl __get_user_1
__get_user_1:
1: ldub r1, @r0
ldi r0, #0
jmp r14
.balign 4
.globl __get_user_2
__get_user_2:
2: lduh r1, @r0
ldi r0, #0
jmp r14
.balign 4
.globl __get_user_4
__get_user_4:
3: ld r1, @r0
ldi r0, #0
jmp r14
bad_get_user:
ldi r1, #0
ldi r0, #-14
jmp r14
#endif /* not CONFIG_ISA_DUAL_ISSUE */
.section __ex_table,"a"
.long 1b,bad_get_user
.long 2b,bad_get_user
.long 3b,bad_get_user
.previous
.end

84
arch/m32r/lib/putuser.S
View File

@ -1,84 +0,0 @@
/*
* __put_user functions.
*
* (C) Copyright 1998 Linus Torvalds
* (C) Copyright 2001 Hirokazu Takata
*
* These functions have a non-standard call interface
* to make them more efficient.
*/
#include <linux/config.h>
/*
* __put_user_X
*
* Inputs: r0 contains the address
* r1 contains the value
*
* Outputs: r0 is error code (0 or -EFAULT)
* r1 is corrupted (will contain "current_task").
*
* These functions should not modify any other registers,
* as they get called from within inline assembly.
*/
#ifdef CONFIG_ISA_DUAL_ISSUE
.text
.balign 4
.globl __put_user_1
__put_user_1:
1: stb r1, @r0 || ldi r0, #0
jmp r14
.balign 4
.globl __put_user_2
__put_user_2:
2: sth r1, @r0 || ldi r0, #0
jmp r14
.balign 4
.globl __put_user_4
__put_user_4:
3: st r1, @r0 || ldi r0, #0
jmp r14
bad_put_user:
ldi r0, #-14 || jmp r14
#else /* not CONFIG_ISA_DUAL_ISSUE */
.text
.balign 4
.globl __put_user_1
__put_user_1:
1: stb r1, @r0
ldi r0, #0
jmp r14
.balign 4
.globl __put_user_2
__put_user_2:
2: sth r1, @r0
ldi r0, #0
jmp r14
.balign 4
.globl __put_user_4
__put_user_4:
3: st r1, @r0
ldi r0, #0
jmp r14
bad_put_user:
ldi r0, #-14
jmp r14
#endif /* not CONFIG_ISA_DUAL_ISSUE */
.section __ex_table,"a"
.long 1b,bad_put_user
.long 2b,bad_put_user
.long 3b,bad_put_user
.previous

266
include/asm-m32r/uaccess.h
View File

@ -5,17 +5,9 @@
* linux/include/asm-m32r/uaccess.h
*
* M32R version.
* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
* Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org>
*/
#undef UACCESS_DEBUG
#ifdef UACCESS_DEBUG
#define UAPRINTK(args...) printk(args)
#else
#define UAPRINTK(args...)
#endif /* UACCESS_DEBUG */
/*
* User space memory access functions
*/
@ -38,27 +30,29 @@
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#ifdef CONFIG_MMU
#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
#else
#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
#define USER_DS MAKE_MM_SEG(0xFFFFFFFF)
#endif /* CONFIG_MMU */
#define get_ds() (KERNEL_DS)
#ifdef CONFIG_MMU
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#else
#else /* not CONFIG_MMU */
#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
#define USER_DS MAKE_MM_SEG(0xFFFFFFFF)
#define get_ds() (KERNEL_DS)
static inline mm_segment_t get_fs(void)
{
return USER_DS;
return USER_DS;
}
static inline void set_fs(mm_segment_t s)
{
}
#endif /* CONFIG_MMU */
#endif /* not CONFIG_MMU */
#define segment_eq(a,b) ((a).seg == (b).seg)
@ -83,9 +77,9 @@ static inline void set_fs(mm_segment_t s)
" subx %0, %0\n" \
" cmpu %4, %1\n" \
" subx %0, %5\n" \
: "=&r"(flag), "=r"(sum) \
: "1"(addr), "r"((int)(size)), \
"r"(current_thread_info()->addr_limit.seg), "r"(0) \
: "=&r" (flag), "=r" (sum) \
: "1" (addr), "r" ((int)(size)), \
"r" (current_thread_info()->addr_limit.seg), "r" (0) \
: "cbit" ); \
flag; })
@ -113,10 +107,10 @@ static inline void set_fs(mm_segment_t s)
#else
static inline int access_ok(int type, const void *addr, unsigned long size)
{
extern unsigned long memory_start, memory_end;
unsigned long val = (unsigned long)addr;
extern unsigned long memory_start, memory_end;
unsigned long val = (unsigned long)addr;
return ((val >= memory_start) && ((val + size) < memory_end));
return ((val >= memory_start) && ((val + size) < memory_end));
}
#endif /* CONFIG_MMU */
@ -155,39 +149,6 @@ extern int fixup_exception(struct pt_regs *regs);
* accesses to the same area of user memory).
*/
extern void __get_user_1(void);
extern void __get_user_2(void);
extern void __get_user_4(void);
#ifndef MODULE
#define __get_user_x(size,ret,x,ptr) \
__asm__ __volatile__( \
" mv r0, %0\n" \
" mv r1, %1\n" \
" bl __get_user_" #size "\n" \
" mv %0, r0\n" \
" mv %1, r1\n" \
: "=r"(ret), "=r"(x) \
: "0"(ptr) \
: "r0", "r1", "r14" )
#else /* MODULE */
/*
* Use "jl" instead of "bl" for MODULE
*/
#define __get_user_x(size,ret,x,ptr) \
__asm__ __volatile__( \
" mv r0, %0\n" \
" mv r1, %1\n" \
" seth lr, #high(__get_user_" #size ")\n" \
" or3 lr, lr, #low(__get_user_" #size ")\n" \
" jl lr\n" \
" mv %0, r0\n" \
" mv %1, r1\n" \
: "=r"(ret), "=r"(x) \
: "0"(ptr) \
: "r0", "r1", "r14" )
#endif
/* Careful: we have to cast the result to the type of the pointer for sign
reasons */
/**
@ -208,20 +169,7 @@ extern void __get_user_4(void);
* On error, the variable @x is set to zero.
*/
#define get_user(x,ptr) \
({ int __ret_gu; \
unsigned long __val_gu; \
__chk_user_ptr(ptr); \
switch(sizeof (*(ptr))) { \
case 1: __get_user_x(1,__ret_gu,__val_gu,ptr); break; \
case 2: __get_user_x(2,__ret_gu,__val_gu,ptr); break; \
case 4: __get_user_x(4,__ret_gu,__val_gu,ptr); break; \
default: __get_user_x(X,__ret_gu,__val_gu,ptr); break; \
} \
(x) = (__typeof__(*(ptr)))__val_gu; \
__ret_gu; \
})
extern void __put_user_bad(void);
__get_user_check((x),(ptr),sizeof(*(ptr)))
/**
* put_user: - Write a simple value into user space.
@ -240,8 +188,7 @@ extern void __put_user_bad(void);
* Returns zero on success, or -EFAULT on error.
*/
#define put_user(x,ptr) \
__put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
__put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
/**
* __get_user: - Get a simple variable from user space, with less checking.
@ -264,8 +211,64 @@ extern void __put_user_bad(void);
* On error, the variable @x is set to zero.
*/
#define __get_user(x,ptr) \
__get_user_nocheck((x),(ptr),sizeof(*(ptr)))
__get_user_nocheck((x),(ptr),sizeof(*(ptr)))
#define __get_user_nocheck(x,ptr,size) \
({ \
long __gu_err = 0; \
unsigned long __gu_val; \
might_sleep(); \
__get_user_size(__gu_val,(ptr),(size),__gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __get_user_check(x,ptr,size) \
({ \
long __gu_err = -EFAULT; \
unsigned long __gu_val = 0; \
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
might_sleep(); \
if (access_ok(VERIFY_READ,__gu_addr,size)) \
__get_user_size(__gu_val,__gu_addr,(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) \
: "r14", "memory")
/**
* __put_user: - Write a simple value into user space, with less checking.
@ -287,11 +290,13 @@ extern void __put_user_bad(void);
* Returns zero on success, or -EFAULT on error.
*/
#define __put_user(x,ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
__put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
#define __put_user_nocheck(x,ptr,size) \
({ \
long __pu_err; \
might_sleep(); \
__put_user_size((x),(ptr),(size),__pu_err); \
__pu_err; \
})
@ -308,28 +313,28 @@ extern void __put_user_bad(void);
})
#if defined(__LITTLE_ENDIAN__)
#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) \
#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,