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Commit d3b904a2 authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Linus Torvalds
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[PATCH] s390: uaccess bug. 

Don't rely on lowcore information in __copy_{from,to}_user_asm. Fix compile
for peculiar get_user() usage in drivers/scsi/scsi_ioctl.c
parent ca70cd21
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Showing with 123 additions and 78 deletions
arch/s390/lib/uaccess.S
View file @ d3b904a2
/*
* arch/s390/lib/uaccess.S
* fixup routines for copy_{from|to}_user functions.
* __copy_{from|to}_user functions.
*
* s390
* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Copyright (C) 2000,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Authors(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* These functions have standard call interface
......@@ -22,17 +22,23 @@ __copy_from_user_asm:
1: sacf 0
lr %r2,%r5
br %r14
2: sll %r4,1
srl %r4,1
lhi %r3,-4096
sll %r3,1
srl %r3,1
n %r3,__LC_TRANS_EXC_ADDR
sr %r3,%r4
jm 1b
j 0b
2: lhi %r1,-4096
lr %r3,%r4
slr %r3,%r1 # %r3 = %r4 + 4096
nr %r3,%r1 # %r3 = (%r4 + 4096) & -4096
slr %r3,%r4 # %r3 = #bytes to next user page boundary
clr %r5,%r3 # copy crosses next page boundary ?
jnh 1b # no, this page fauled
# The page after the current user page might have faulted.
# We cant't find out which page because the program check handler
# might have callled schedule, destroying all lowcore information.
# We retry with the shortened length.
3: mvcle %r2,%r4,0
jo 3b
j 1b
.section __ex_table,"a"
.long 0b,2b
.long 3b,1b
.previous
.align 4
......@@ -46,17 +52,23 @@ __copy_to_user_asm:
1: sacf 0
lr %r2,%r3
br %r14
2: sll %r4,1
srl %r4,1
lhi %r5,-4096
sll %r5,1
srl %r5,1
n %r5,__LC_TRANS_EXC_ADDR
sr %r5,%r4
jm 1b
j 0b
2: lhi %r1,-4096
lr %r5,%r4
slr %r5,%r1 # %r5 = %r4 + 4096
nr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
slr %r5,%r4 # %r5 = #bytes to next user page boundary
clr %r3,%r5 # copy crosses next page boundary ?
jnh 1b # no, the current page fauled
# The page after the current user page might have faulted.
# We cant't find out which page because the program check handler
# might have callled schedule, destroying all lowcore information.
# We retry with the shortened length.
3: mvcle %r4,%r2,0
jo 3b
j 1b
.section __ex_table,"a"
.long 0b,2b
.long 0b,2b
.long 3b,1b
.previous
.align 4
......@@ -71,18 +83,26 @@ __clear_user_asm:
0: mvcle %r4,%r2,0
jo 0b
1: sacf 0
lr %r2,%r3
br %r14
2: sll %r4,1
srl %r4,1
lhi %r5,-4096
sll %r5,1
srl %r5,1
n %r5,__LC_TRANS_EXC_ADDR
sr %r5,%r4
jm 1b
j 0b
2: lr %r2,%r5
lhi %r1,-4096
slr %r5,%r1 # %r5 = %r4 + 4096
nr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
slr %r5,%r4 # %r5 = #bytes to next user page boundary
clr %r2,%r5 # copy crosses next page boundary ?
jnh 1b # no, the current page fauled
# The page after the current user page might have faulted.
# We cant't find out which page because the program check handler
# might have callled schedule, destroying all lowcore information.
# We retry with the shortened length.
slr %r2,%r5
3: mvcle %r4,%r2,0
jo 3b
j 1b
4: alr %r2,%r5
j 1b
.section __ex_table,"a"
.long 0b,2b
.long 0b,2b
.long 3b,4b
.previous
arch/s390x/lib/uaccess.S
View file @ d3b904a2
/*
* arch/s390x/lib/uaccess.S
* fixup routines for copy_{from|to}_user functions.
* __copy_{from|to}_user functions.
*
* S390
* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* s390
* Copyright (C) 2000,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Authors(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* These functions have standard call interface
......@@ -22,14 +22,23 @@ __copy_from_user_asm:
1: sacf 0
lgr %r2,%r5
br %r14
2: lghi %r3,-4096
ng %r3,__LC_TRANS_EXC_ADDR
sgr %r3,%r4
jm 1b
j 0b
2: lghi %r1,-4096
lgr %r3,%r4
slgr %r3,%r1 # %r3 = %r4 + 4096
ngr %r3,%r1 # %r3 = (%r4 + 4096) & -4096
slgr %r3,%r4 # %r3 = #bytes to next user page boundary
clgr %r5,%r3 # copy crosses next page boundary ?
jnh 1b # no, this page fauled
# The page after the current user page might have faulted.
# We cant't find out which page because the program check handler
# might have callled schedule, destroying all lowcore information.
# We retry with the shortened length.
3: mvcle %r2,%r4,0
jo 3b
j 1b
.section __ex_table,"a"
.align 8
.quad 0b,2b
.quad 3b,1b
.previous
.align 4
......@@ -43,14 +52,23 @@ __copy_to_user_asm:
1: sacf 0
lgr %r2,%r3
br %r14
2: lghi %r5,-4096
ng %r5,__LC_TRANS_EXC_ADDR
sgr %r5,%r4
jm 1b
j 0b
2: lghi %r1,-4096
lgr %r5,%r4
slgr %r5,%r1 # %r5 = %r4 + 4096
ngr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
slgr %r5,%r4 # %r5 = #bytes to next user page boundary
clgr %r3,%r5 # copy crosses next page boundary ?
jnh 1b # no, the current page fauled
# The page after the current user page might have faulted.
# We cant't find out which page because the program check handler
# might have callled schedule, destroying all lowcore information.
# We retry with the shortened length.
3: mvcle %r4,%r2,0
jo 3b
j 1b
.section __ex_table,"a"
.align 8
.quad 0b,2b
.quad 0b,2b
.quad 3b,1b
.previous
.align 4
......@@ -65,14 +83,25 @@ __clear_user_asm:
0: mvcle %r4,%r2,0
jo 0b
1: sacf 0
lgr %r2,%r5
br %r14
2: lghi %r5,-4096
ng %r5,__LC_TRANS_EXC_ADDR
sgr %r5,%r4
jm 1b
j 0b
2: lgr %r2,%r5
lghi %r1,-4096
slgr %r5,%r1 # %r5 = %r4 + 4096
ngr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
slgr %r5,%r4 # %r5 = #bytes to next user page boundary
clgr %r2,%r5 # copy crosses next page boundary ?
jnh 1b # no, the current page fauled
# The page after the current user page might have faulted.
# We cant't find out which page because the program check handler
# might have callled schedule, destroying all lowcore information.
# We retry with the shortened length.
slgr %r2,%r5
3: mvcle %r4,%r2,0
jo 3b
j 1b
4: algr %r2,%r5
j 1b
.section __ex_table,"a"
.align 8
.quad 0b,2b
.quad 0b,2b
.quad 3b,4b
.previous
include/asm-s390/uaccess.h
View file @ d3b904a2
......@@ -199,24 +199,23 @@ extern inline int __put_user_asm_1(__u8 x, void *ptr)
*/
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) *__pu_addr = (ptr); \
__typeof__(*(ptr)) __x = (x); \
int __pu_err; \
switch (sizeof (*(ptr))) { \
case 1: \
__pu_err = __put_user_asm_1((__u8)(__u32) __x, \
__pu_addr); \
ptr); \
break; \
case 2: \
__pu_err = __put_user_asm_2((__u16)(__u32) __x, \
__pu_addr); \
ptr); \
break; \
case 4: \
__pu_err = __put_user_asm_4((__u32) __x, \
__pu_addr); \
ptr); \
break; \
case 8: \
__pu_err = __put_user_asm_8(&__x, __pu_addr); \
__pu_err = __put_user_asm_8(&__x, ptr); \
break; \
default: \
__pu_err = __put_user_bad(); \
......@@ -333,21 +332,20 @@ extern int __put_user_bad(void);
#define __get_user(x, ptr) \
({ \
__typeof__(ptr) __gu_addr = (ptr); \
__typeof__(*(ptr)) __x; \
int __gu_err; \
switch (sizeof(*(__gu_addr))) { \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_asm_1(__x, __gu_addr, __gu_err); \
__get_user_asm_1(__x, ptr, __gu_err); \
break; \
case 2: \
__get_user_asm_2(__x, __gu_addr, __gu_err); \
__get_user_asm_2(__x, ptr, __gu_err); \
break; \
case 4: \
__get_user_asm_4(__x, __gu_addr, __gu_err); \
__get_user_asm_4(__x, ptr, __gu_err); \
break; \
case 8: \
__get_user_asm_8(__x, __gu_addr, __gu_err); \
__get_user_asm_8(__x, ptr, __gu_err); \
break; \
default: \
__x = 0; \
......
include/asm-s390x/uaccess.h
View file @ d3b904a2
......@@ -177,25 +177,24 @@ extern inline int __put_user_asm_1(__u8 x, void *ptr)
*/
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) *__pu_addr = (ptr); \
__typeof__(*(ptr)) __x = (x); \
int __pu_err; \
switch (sizeof (*(__pu_addr))) { \
switch (sizeof (*(ptr))) { \
case 1: \
__pu_err = __put_user_asm_1((__u8)(__u64)(__x), \
__pu_addr); \
ptr); \
break; \
case 2: \
__pu_err = __put_user_asm_2((__u16)(__u64)(__x),\
__pu_addr); \
ptr); \
break; \
case 4: \
__pu_err = __put_user_asm_4((__u32)(__u64)(__x),\
__pu_addr); \
ptr); \
break; \
case 8: \
__pu_err = __put_user_asm_8((__u64)(__x), \
__pu_addr); \
ptr); \
break; \
default: \
__pu_err = __put_user_bad(); \
......@@ -290,21 +289,20 @@ extern int __put_user_bad(void);
#define __get_user(x, ptr) \
({ \
__typeof__(ptr) __gu_addr = (ptr); \
__typeof__(*(ptr)) __x; \
int __gu_err; \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_asm_1(__x,__gu_addr,__gu_err); \
__get_user_asm_1(__x,ptr,__gu_err); \
break; \
case 2: \
__get_user_asm_2(__x,__gu_addr,__gu_err); \
__get_user_asm_2(__x,ptr,__gu_err); \
break; \
case 4: \
__get_user_asm_4(__x,__gu_addr,__gu_err); \
__get_user_asm_4(__x,ptr,__gu_err); \
break; \
case 8: \
__get_user_asm_8(__x,__gu_addr,__gu_err); \
__get_user_asm_8(__x,ptr,__gu_err); \
break; \
default: \
__x = 0; \
......
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