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Commit eabbeb61 authored by David Mosberger's avatar David Mosberger
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ia64: Fix bug discovered by Bill Nottingham & Jakub Jelinek where 

	put_user() arguments with function-calls would cause the
	macro to return unexpected values.  Fixed by avoiding macro
	argument evaluation while r8/r9 are in use for exception-handling
	purposes.  Also, consolidated access-macros so that GCC and
	Intel compiler use 90% the same code.
parent 3a9e46f8
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Showing with 117 additions and 236 deletions
include/asm-ia64/uaccess.h
View file @ eabbeb61
...@@ -50,7 +50,7 @@ ...@@ -50,7 +50,7 @@
#define get_fs() (current_thread_info()->addr_limit) #define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x)) #define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a,b) ((a).seg == (b).seg) #define segment_eq(a, b) ((a).seg == (b).seg)
/* /*
* When accessing user memory, we need to make sure the entire area really is in * When accessing user memory, we need to make sure the entire area really is in
...@@ -58,16 +58,16 @@ ...@@ -58,16 +58,16 @@
* address TASK_SIZE is never valid. We also need to make sure that the address doesn't * address TASK_SIZE is never valid. We also need to make sure that the address doesn't
* point inside the virtually mapped linear page table. * point inside the virtually mapped linear page table.
*/ */
#define __access_ok(addr,size,segment) \ #define __access_ok(addr, size, segment) \
likely(((unsigned long) (addr)) <= (segment).seg \ (likely((unsigned long) (addr) <= (segment).seg) \
&& ((segment).seg == KERNEL_DS.seg \ && ((segment).seg == KERNEL_DS.seg \
|| REGION_OFFSET((unsigned long) (addr)) < RGN_MAP_LIMIT)) || likely(REGION_OFFSET((unsigned long) (addr)) < RGN_MAP_LIMIT)))
#define access_ok(type,addr,size) __access_ok((addr),(size),get_fs()) #define access_ok(type, addr, size) __access_ok((addr), (size), get_fs())
static inline int static inline int
verify_area (int type, const void *addr, unsigned long size) verify_area (int type, const void *addr, unsigned long size)
{ {
return access_ok(type,addr,size) ? 0 : -EFAULT; return access_ok(type, addr, size) ? 0 : -EFAULT;
} }
/* /*
...@@ -78,292 +78,173 @@ verify_area (int type, const void *addr, unsigned long size) ...@@ -78,292 +78,173 @@ verify_area (int type, const void *addr, unsigned long size)
* (a) re-use the arguments for side effects (sizeof/typeof is ok) * (a) re-use the arguments for side effects (sizeof/typeof is ok)
* (b) require any knowledge of processes at this stage * (b) require any knowledge of processes at this stage
*/ */
#define put_user(x,ptr) __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)),get_fs()) #define put_user(x, ptr) __put_user_check((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)), get_fs())
#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)),get_fs()) #define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)), get_fs())
/* /*
* The "__xxx" versions do not do address space checking, useful when * The "__xxx" versions do not do address space checking, useful when
* doing multiple accesses to the same area (the programmer has to do the * doing multiple accesses to the same area (the programmer has to do the
* checks by hand with "access_ok()") * checks by hand with "access_ok()")
*/ */
#define __put_user(x,ptr) __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr))) #define __put_user(x, ptr) __put_user_nocheck((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)))
#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr))) #define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
#ifdef ASM_SUPPORTED #ifdef ASM_SUPPORTED
struct __large_struct { unsigned long buf[100]; };
extern void __get_user_unknown (void); # define __m(x) (*(struct __large_struct *)(x))
#define __get_user_nocheck(x,ptr,size) \
({ \
register long __gu_err asm ("r8") = 0; \
register long __gu_val asm ("r9") = 0; \
switch (size) { \
case 1: __get_user_8(ptr); break; \
case 2: __get_user_16(ptr); break; \
case 4: __get_user_32(ptr); break; \
case 8: __get_user_64(ptr); break; \
default: __get_user_unknown(); break; \
} \
(x) = (__typeof__(*(ptr))) __gu_val; \
__gu_err; \
})
#define __get_user_check(x,ptr,size,segment) \
({ \
register long __gu_err asm ("r8") = -EFAULT; \
register long __gu_val asm ("r9") = 0; \
const __typeof__(*(ptr)) *__gu_addr = (ptr); \
if (__access_ok((long)__gu_addr,size,segment)) { \
__gu_err = 0; \
switch (size) { \
case 1: __get_user_8(__gu_addr); break; \
case 2: __get_user_16(__gu_addr); break; \
case 4: __get_user_32(__gu_addr); break; \
case 8: __get_user_64(__gu_addr); break; \
default: __get_user_unknown(); break; \
} \
} \
(x) = (__typeof__(*(ptr))) __gu_val; \
__gu_err; \
})
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))
/* We need to declare the __ex_table section before we can use it in .xdata. */ /* We need to declare the __ex_table section before we can use it in .xdata. */
asm (".section \"__ex_table\", \"a\"\n\t.previous"); asm (".section \"__ex_table\", \"a\"\n\t.previous");
#define __get_user_64(addr) \ # define __get_user_size(val, addr, n, err) \
asm ("\n[1:]\tld8 %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \ do { \
register long __gu_r8 asm ("r8") = 0; \
register long __gu_r9 asm ("r9"); \
asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \
"\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \ "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \
"[1:]" \ "[1:]" \
: "=r"(__gu_val), "=r"(__gu_err) : "m"(__m(addr)), "1"(__gu_err)); : "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8)); \
(err) = __gu_r8; \
#define __get_user_32(addr) \ (val) = __gu_r9; \
asm ("\n[1:]\tld4 %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \ } while (0)
"\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \
"[1:]" \
: "=r"(__gu_val), "=r"(__gu_err) : "m"(__m(addr)), "1"(__gu_err));
#define __get_user_16(addr) \
asm ("\n[1:]\tld2 %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \
"\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \
"[1:]" \
: "=r"(__gu_val), "=r"(__gu_err) : "m"(__m(addr)), "1"(__gu_err));
#define __get_user_8(addr) \
asm ("\n[1:]\tld1 %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \
"\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \
"[1:]" \
: "=r"(__gu_val), "=r"(__gu_err) : "m"(__m(addr)), "1"(__gu_err));
extern void __put_user_unknown (void);
#define __put_user_nocheck(x,ptr,size) \
({ \
register long __pu_err asm ("r8") = 0; \
switch (size) { \
case 1: __put_user_8(x,ptr); break; \
case 2: __put_user_16(x,ptr); break; \
case 4: __put_user_32(x,ptr); break; \
case 8: __put_user_64(x,ptr); break; \
default: __put_user_unknown(); break; \
} \
__pu_err; \
})
#define __put_user_check(x,ptr,size,segment) \
({ \
register long __pu_err asm ("r8") = -EFAULT; \
__typeof__(*(ptr)) *__pu_addr = (ptr); \
if (__access_ok((long)__pu_addr,size,segment)) { \
__pu_err = 0; \
switch (size) { \
case 1: __put_user_8(x,__pu_addr); break; \
case 2: __put_user_16(x,__pu_addr); break; \
case 4: __put_user_32(x,__pu_addr); break; \
case 8: __put_user_64(x,__pu_addr); break; \
default: __put_user_unknown(); break; \
} \
} \
__pu_err; \
})
/* /*
* The "__put_user_xx()" macros tell gcc they read from memory * The "__put_user_size()" macro tells gcc it reads from memory instead of writing it. This
* instead of writing: this is because they do not write to * is because they do not write to any memory gcc knows about, so there are no aliasing
* any memory gcc knows about, so there are no aliasing issues * issues.
*/ */
#define __put_user_64(x,addr) \ # define __put_user_size(val, addr, n, err) \
asm volatile ( \ do { \
"\n[1:]\tst8 %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \ register long __pu_r8 asm ("r8") = 0; \
"\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \ asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \
"[1:]" \
: "=r"(__pu_err) : "m"(__m(addr)), "rO"(x), "0"(__pu_err))
#define __put_user_32(x,addr) \
asm volatile ( \
"\n[1:]\tst4 %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \
"\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \
"[1:]" \
: "=r"(__pu_err) : "m"(__m(addr)), "rO"(x), "0"(__pu_err))
#define __put_user_16(x,addr) \
asm volatile ( \
"\n[1:]\tst2 %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \
"\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \ "\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \
"[1:]" \ "[1:]" \
: "=r"(__pu_err) : "m"(__m(addr)), "rO"(x), "0"(__pu_err)) : "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), "0"(__pu_r8)); \
(err) = __pu_r8; \
#define __put_user_8(x,addr) \ } while (0)
asm volatile ( \
"\n[1:]\tst1 %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \
"\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \
"[1:]" \
: "=r"(__pu_err) : "m"(__m(addr)), "rO"(x), "0"(__pu_err))
#else /* !ASM_SUPPORTED */ #else /* !ASM_SUPPORTED */
# define RELOC_TYPE 2 /* ip-rel */
#define RELOC_TYPE 2 /* ip-rel */ # define __get_user_size(val, addr, n, err) \
do { \
#define __put_user_xx(val, addr, size, err) \ __ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE); \
__st_user("__ex_table", (unsigned long) addr, size, RELOC_TYPE, (unsigned long) (val)); \
(err) = ia64_getreg(_IA64_REG_R8);
#define __get_user_xx(val, addr, size, err) \
__ld_user("__ex_table", (unsigned long) addr, size, RELOC_TYPE); \
(err) = ia64_getreg(_IA64_REG_R8); \ (err) = ia64_getreg(_IA64_REG_R8); \
(val) = ia64_getreg(_IA64_REG_R9); (val) = ia64_getreg(_IA64_REG_R9); \
} while (0)
# define __put_user_size(val, addr, n, err) \
do { \
__st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE, (unsigned long) (val)); \
(err) = ia64_getreg(_IA64_REG_R8); \
} while (0)
#endif /* !ASM_SUPPORTED */
extern void __get_user_unknown (void); extern void __get_user_unknown (void);
#define __get_user_nocheck(x, ptr, size) \ /*
* Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
* could clobber r8 and r9 (among others). Thus, be careful not to evaluate it while
* using r8/r9.
*/
#define __do_get_user(check, x, ptr, size, segment) \
({ \ ({ \
register long __gu_err = 0; \ const __typeof__(*(ptr)) *__gu_ptr = (ptr); \
register long __gu_val = 0; \ __typeof__ (size) __gu_size = (size); \
const __typeof__(*(ptr)) *__gu_addr = (ptr); \ long __gu_err = -EFAULT, __gu_val = 0; \
switch (size) { \ \
case 1: case 2: case 4: case 8: \ if (!check || __access_ok((long) __gu_ptr, size, segment)) \
__get_user_xx(__gu_val, __gu_addr, size, __gu_err); \ switch (__gu_size) { \
break; \ case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); break; \
default: \ case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); break; \
__get_user_unknown(); \ case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); break; \
break; \ case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); break; \
default: __get_user_unknown(); break; \
} \ } \
(x) = (__typeof__(*(ptr))) __gu_val; \ (x) = (__typeof__(*(__gu_ptr))) __gu_val; \
__gu_err; \ __gu_err; \
}) })
#define __get_user_check(x,ptr,size,segment) \ #define __get_user_nocheck(x, ptr, size) __do_get_user(0, x, ptr, size, KERNEL_DS)
({ \ #define __get_user_check(x, ptr, size, segment) __do_get_user(1, x, ptr, size, segment)
register long __gu_err = -EFAULT; \
register long __gu_val = 0; \
const __typeof__(*(ptr)) *__gu_addr = (ptr); \
if (__access_ok((long) __gu_addr, size, segment)) { \
switch (size) { \
case 1: case 2: case 4: case 8: \
__get_user_xx(__gu_val, __gu_addr, size, __gu_err); \
break; \
default: \
__get_user_unknown(); break; \
} \
} \
(x) = (__typeof__(*(ptr))) __gu_val; \
__gu_err; \
})
extern void __put_user_unknown (void); extern void __put_user_unknown (void);
#define __put_user_nocheck(x, ptr, size) \ /*
({ \ * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
int __pu_err = 0; \ * could clobber r8 (among others). Thus, be careful not to evaluate them while using r8.
__typeof__(*(ptr)) *__pu_addr = (ptr); \ */
switch (size) { \ #define __do_put_user(check, x, ptr, size, segment) \
case 1: case 2: case 4: case 8: \
__put_user_xx(x, __pu_addr, size, __pu_err); \
break; \
default: \
__put_user_unknown(); break; \
} \
__pu_err; \
})
#define __put_user_check(x,ptr,size,segment) \
({ \ ({ \
register long __pu_err = -EFAULT; \ __typeof__ (x) __pu_x = (x); \
__typeof__(*(ptr)) *__pu_addr = (ptr); \ __typeof__ (*(ptr)) *__pu_ptr = (ptr); \
if (__access_ok((long)__pu_addr,size,segment)) { \ __typeof__ (size) __pu_size = (size); \
switch (size) { \ long __pu_err = -EFAULT; \
case 1: case 2: case 4: case 8: \ \
__put_user_xx(x,__pu_addr, size, __pu_err); \ if (!check || __access_ok((long) __pu_ptr, __pu_size, segment)) \
break; \ switch (__pu_size) { \
default: \ case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); break; \
__put_user_unknown(); break; \ case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); break; \
} \ case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); break; \
case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); break; \
default: __put_user_unknown(); break; \
} \ } \
__pu_err; \ __pu_err; \
}) })
#endif /* !ASM_SUPPORTED */ #define __put_user_nocheck(x, ptr, size) __do_put_user(0, x, ptr, size, KERNEL_DS)
#define __put_user_check(x, ptr, size, segment) __do_put_user(1, x, ptr, size, segment)
/* /*
* Complex access routines * Complex access routines
*/ */
extern unsigned long __copy_user (void *to, const void *from, unsigned long count); extern unsigned long __copy_user (void *to, const void *from, unsigned long count);
#define __copy_to_user(to,from,n) __copy_user((to), (from), (n)) #define __copy_to_user(to, from, n) __copy_user((to), (from), (n))
#define __copy_from_user(to,from,n) __copy_user((to), (from), (n)) #define __copy_from_user(to, from, n) __copy_user((to), (from), (n))
#define copy_to_user(to,from,n) __copy_tofrom_user((to), (from), (n), 1) #define copy_to_user(to, from, n) __copy_tofrom_user((to), (from), (n), 1)
#define copy_from_user(to,from,n) __copy_tofrom_user((to), (from), (n), 0) #define copy_from_user(to, from, n) __copy_tofrom_user((to), (from), (n), 0)
#define __copy_tofrom_user(to,from,n,check_to) \ #define __copy_tofrom_user(to, from, n, check_to) \
({ \ ({ \
void *__cu_to = (to); \ void *__cu_to = (to); \
const void *__cu_from = (from); \ const void *__cu_from = (from); \
long __cu_len = (n); \ long __cu_len = (n); \
\ \
if (__access_ok((long) ((check_to) ? __cu_to : __cu_from), __cu_len, get_fs())) { \ if (__access_ok((long) ((check_to) ? __cu_to : __cu_from), __cu_len, get_fs())) \
__cu_len = __copy_user(__cu_to, __cu_from, __cu_len); \ __cu_len = __copy_user(__cu_to, __cu_from, __cu_len); \
} \
__cu_len; \ __cu_len; \
}) })
#define __copy_in_user(to, from, size) \ #define __copy_in_user(to, from, size) __copy_user((to), (from), (size))
__copy_user((to), (from), (size))
static inline unsigned long static inline unsigned long
copy_in_user (void *to, const void *from, unsigned long n) copy_in_user (void *to, const void *from, unsigned long n)
{ {
if (likely(access_ok(VERIFY_READ, from, n) && if (likely(access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n)))
access_ok(VERIFY_WRITE, to, n)))
n = __copy_user(to, from, n); n = __copy_user(to, from, n);
return n; return n;
} }
extern unsigned long __do_clear_user (void *, unsigned long); extern unsigned long __do_clear_user (void *, unsigned long);
#define __clear_user(to,n) \ #define __clear_user(to, n) __do_clear_user(to, n)
({ \
__do_clear_user(to,n); \
})
#define clear_user(to,n) \ #define clear_user(to, n) \
({ \ ({ \
unsigned long __cu_len = (n); \ unsigned long __cu_len = (n); \
if (__access_ok((long) to, __cu_len, get_fs())) { \ if (__access_ok((long) to, __cu_len, get_fs())) \
__cu_len = __do_clear_user(to, __cu_len); \ __cu_len = __do_clear_user(to, __cu_len); \
} \
__cu_len; \ __cu_len; \
}) })
/* Returns: -EFAULT if exception before terminator, N if the entire /*
buffer filled, else strlen. */ * Returns: -EFAULT if exception before terminator, N if the entire buffer filled, else
* strlen.
*/
extern long __strncpy_from_user (char *to, const char *from, long to_len); extern long __strncpy_from_user (char *to, const char *from, long to_len);
#define strncpy_from_user(to,from,n) \ #define strncpy_from_user(to, from, n) \
({ \ ({ \
const char * __sfu_from = (from); \ const char * __sfu_from = (from); \
long __sfu_ret = -EFAULT; \ long __sfu_ret = -EFAULT; \
......
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