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Diffstat (limited to 'arch/mips/include/asm/uaccess.h')
-rw-r--r--arch/mips/include/asm/uaccess.h621
1 files changed, 197 insertions, 424 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index 62b298c50905..c0cede273c7c 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -16,20 +16,10 @@
#include <asm/asm-eva.h>
#include <asm/extable.h>
-/*
- * The fs value determines whether argument validity checking should be
- * performed or not. If get_fs() == USER_DS, checking is performed, with
- * get_fs() == KERNEL_DS, checking is bypassed.
- *
- * For historical reasons, these macros are grossly misnamed.
- */
#ifdef CONFIG_32BIT
-#ifdef CONFIG_KVM_GUEST
-#define __UA_LIMIT 0x40000000UL
-#else
#define __UA_LIMIT 0x80000000UL
-#endif
+#define TASK_SIZE_MAX KSEG0
#define __UA_ADDR ".word"
#define __UA_LA "la"
@@ -44,6 +34,7 @@
extern u64 __ua_limit;
#define __UA_LIMIT __ua_limit
+#define TASK_SIZE_MAX XKSSEG
#define __UA_ADDR ".dword"
#define __UA_LA "dla"
@@ -53,85 +44,7 @@ extern u64 __ua_limit;
#endif /* CONFIG_64BIT */
-/*
- * USER_DS is a bitmask that has the bits set that may not be set in a valid
- * userspace address. Note that we limit 32-bit userspace to 0x7fff8000 but
- * the arithmetic we're doing only works if the limit is a power of two, so
- * we use 0x80000000 here on 32-bit kernels. If a process passes an invalid
- * address in this range it's the process's problem, not ours :-)
- */
-
-#ifdef CONFIG_KVM_GUEST
-#define KERNEL_DS ((mm_segment_t) { 0x80000000UL })
-#define USER_DS ((mm_segment_t) { 0xC0000000UL })
-#else
-#define KERNEL_DS ((mm_segment_t) { 0UL })
-#define USER_DS ((mm_segment_t) { __UA_LIMIT })
-#endif
-
-#define get_fs() (current_thread_info()->addr_limit)
-#define set_fs(x) (current_thread_info()->addr_limit = (x))
-
-#define segment_eq(a, b) ((a).seg == (b).seg)
-
-/*
- * eva_kernel_access() - determine whether kernel memory access on an EVA system
- *
- * Determines whether memory accesses should be performed to kernel memory
- * on a system using Extended Virtual Addressing (EVA).
- *
- * Return: true if a kernel memory access on an EVA system, else false.
- */
-static inline bool eva_kernel_access(void)
-{
- if (!IS_ENABLED(CONFIG_EVA))
- return false;
-
- return uaccess_kernel();
-}
-
-/*
- * Is a address valid? This does a straightforward calculation rather
- * than tests.
- *
- * Address valid if:
- * - "addr" doesn't have any high-bits set
- * - AND "size" doesn't have any high-bits set
- * - AND "addr+size" doesn't have any high-bits set
- * - OR we are in kernel mode.
- *
- * __ua_size() is a trick to avoid runtime checking of positive constant
- * sizes; for those we already know at compile time that the size is ok.
- */
-#define __ua_size(size) \
- ((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size))
-
-/*
- * access_ok: - Checks if a user space pointer is valid
- * @addr: User space pointer to start of block to check
- * @size: Size of block to check
- *
- * Context: User context only. This function may sleep if pagefaults are
- * enabled.
- *
- * Checks if a pointer to a block of memory in user space is valid.
- *
- * Returns true (nonzero) if the memory block may be valid, false (zero)
- * if it is definitely invalid.
- *
- * Note that, depending on architecture, this function probably just
- * checks that the pointer is in the user space range - after calling
- * this function, memory access functions may still return -EFAULT.
- */
-
-static inline int __access_ok(const void __user *p, unsigned long size)
-{
- unsigned long addr = (unsigned long)p;
- return (get_fs().seg & (addr | (addr + size) | __ua_size(size))) == 0;
-}
-
-#define access_ok(addr, size) \
- likely(__access_ok((addr), (size)))
+#include <asm-generic/access_ok.h>
/*
* put_user: - Write a simple value into user space.
@@ -150,8 +63,13 @@ static inline int __access_ok(const void __user *p, unsigned long size)
*
* Returns zero on success, or -EFAULT on error.
*/
-#define put_user(x,ptr) \
- __put_user_check((x), (ptr), sizeof(*(ptr)))
+#define put_user(x, ptr) \
+({ \
+ __typeof__(*(ptr)) __user *__p = (ptr); \
+ \
+ might_fault(); \
+ access_ok(__p, sizeof(*__p)) ? __put_user((x), __p) : -EFAULT; \
+})
/*
* get_user: - Get a simple variable from user space.
@@ -171,8 +89,14 @@ static inline int __access_ok(const void __user *p, unsigned long size)
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
-#define get_user(x,ptr) \
- __get_user_check((x), (ptr), sizeof(*(ptr)))
+#define get_user(x, ptr) \
+({ \
+ const __typeof__(*(ptr)) __user *__p = (ptr); \
+ \
+ might_fault(); \
+ access_ok(__p, sizeof(*__p)) ? __get_user((x), __p) : \
+ ((x) = 0, -EFAULT); \
+})
/*
* __put_user: - Write a simple value into user space, with less checking.
@@ -194,8 +118,32 @@ static inline int __access_ok(const void __user *p, unsigned long size)
*
* Returns zero on success, or -EFAULT on error.
*/
-#define __put_user(x,ptr) \
- __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
+#define __put_user(x, ptr) \
+({ \
+ __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \
+ __typeof__(*(ptr)) __pu_val = (x); \
+ int __pu_err = 0; \
+ \
+ __chk_user_ptr(__pu_ptr); \
+ switch (sizeof(*__pu_ptr)) { \
+ case 1: \
+ __put_data_asm(user_sb, __pu_ptr); \
+ break; \
+ case 2: \
+ __put_data_asm(user_sh, __pu_ptr); \
+ break; \
+ case 4: \
+ __put_data_asm(user_sw, __pu_ptr); \
+ break; \
+ case 8: \
+ __PUT_DW(user_sd, __pu_ptr); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ } \
+ \
+ __pu_err; \
+})
/*
* __get_user: - Get a simple variable from user space, with less checking.
@@ -218,49 +166,35 @@ static inline int __access_ok(const void __user *p, unsigned long size)
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
-#define __get_user(x,ptr) \
- __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
+#define __get_user(x, ptr) \
+({ \
+ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
+ int __gu_err = 0; \
+ \
+ __chk_user_ptr(__gu_ptr); \
+ switch (sizeof(*__gu_ptr)) { \
+ case 1: \
+ __get_data_asm((x), user_lb, __gu_ptr); \
+ break; \
+ case 2: \
+ __get_data_asm((x), user_lh, __gu_ptr); \
+ break; \
+ case 4: \
+ __get_data_asm((x), user_lw, __gu_ptr); \
+ break; \
+ case 8: \
+ __GET_DW((x), user_ld, __gu_ptr); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ } \
+ \
+ __gu_err; \
+})
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
-/*
- * Yuck. We need two variants, one for 64bit operation and one
- * for 32 bit mode and old iron.
- */
-#ifndef CONFIG_EVA
-#define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr)
-#else
-/*
- * Kernel specific functions for EVA. We need to use normal load instructions
- * to read data from kernel when operating in EVA mode. We use these macros to
- * avoid redefining __get_user_asm for EVA.
- */
-#undef _loadd
-#undef _loadw
-#undef _loadh
-#undef _loadb
-#ifdef CONFIG_32BIT
-#define _loadd _loadw
-#else
-#define _loadd(reg, addr) "ld " reg ", " addr
-#endif
-#define _loadw(reg, addr) "lw " reg ", " addr
-#define _loadh(reg, addr) "lh " reg ", " addr
-#define _loadb(reg, addr) "lb " reg ", " addr
-
-#define __get_kernel_common(val, size, ptr) \
-do { \
- switch (size) { \
- case 1: __get_data_asm(val, _loadb, ptr); break; \
- case 2: __get_data_asm(val, _loadh, ptr); break; \
- case 4: __get_data_asm(val, _loadw, ptr); break; \
- case 8: __GET_DW(val, _loadd, ptr); break; \
- default: __get_user_unknown(); break; \
- } \
-} while (0)
-#endif
-
#ifdef CONFIG_32BIT
#define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr)
#endif
@@ -268,49 +202,6 @@ do { \
#define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr)
#endif
-extern void __get_user_unknown(void);
-
-#define __get_user_common(val, size, ptr) \
-do { \
- switch (size) { \
- case 1: __get_data_asm(val, user_lb, ptr); break; \
- case 2: __get_data_asm(val, user_lh, ptr); break; \
- case 4: __get_data_asm(val, user_lw, ptr); break; \
- case 8: __GET_DW(val, user_ld, ptr); break; \
- default: __get_user_unknown(); break; \
- } \
-} while (0)
-
-#define __get_user_nocheck(x, ptr, size) \
-({ \
- int __gu_err; \
- \
- if (eva_kernel_access()) { \
- __get_kernel_common((x), size, ptr); \
- } else { \
- __chk_user_ptr(ptr); \
- __get_user_common((x), size, ptr); \
- } \
- __gu_err; \
-})
-
-#define __get_user_check(x, ptr, size) \
-({ \
- int __gu_err = -EFAULT; \
- const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
- \
- might_fault(); \
- if (likely(access_ok( __gu_ptr, size))) { \
- if (eva_kernel_access()) \
- __get_kernel_common((x), size, __gu_ptr); \
- else \
- __get_user_common((x), size, __gu_ptr); \
- } else \
- (x) = 0; \
- \
- __gu_err; \
-})
-
#define __get_data_asm(val, insn, addr) \
{ \
long __gu_tmp; \
@@ -364,39 +255,34 @@ do { \
(val) = __gu_tmp.t; \
}
-#ifndef CONFIG_EVA
-#define __put_kernel_common(ptr, size) __put_user_common(ptr, size)
-#else
-/*
- * Kernel specific functions for EVA. We need to use normal load instructions
- * to read data from kernel when operating in EVA mode. We use these macros to
- * avoid redefining __get_data_asm for EVA.
- */
-#undef _stored
-#undef _storew
-#undef _storeh
-#undef _storeb
-#ifdef CONFIG_32BIT
-#define _stored _storew
-#else
-#define _stored(reg, addr) "ld " reg ", " addr
-#endif
-
-#define _storew(reg, addr) "sw " reg ", " addr
-#define _storeh(reg, addr) "sh " reg ", " addr
-#define _storeb(reg, addr) "sb " reg ", " addr
-
-#define __put_kernel_common(ptr, size) \
+#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
- switch (size) { \
- case 1: __put_data_asm(_storeb, ptr); break; \
- case 2: __put_data_asm(_storeh, ptr); break; \
- case 4: __put_data_asm(_storew, ptr); break; \
- case 8: __PUT_DW(_stored, ptr); break; \
- default: __put_user_unknown(); break; \
+ int __gu_err; \
+ \
+ switch (sizeof(type)) { \
+ case 1: \
+ __get_data_asm(*(type *)(dst), kernel_lb, \
+ (__force type *)(src)); \
+ break; \
+ case 2: \
+ __get_data_asm(*(type *)(dst), kernel_lh, \
+ (__force type *)(src)); \
+ break; \
+ case 4: \
+ __get_data_asm(*(type *)(dst), kernel_lw, \
+ (__force type *)(src)); \
+ break; \
+ case 8: \
+ __GET_DW(*(type *)(dst), kernel_ld, \
+ (__force type *)(src)); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ break; \
} \
-} while(0)
-#endif
+ if (unlikely(__gu_err)) \
+ goto err_label; \
+} while (0)
/*
* Yuck. We need two variants, one for 64bit operation and one
@@ -409,49 +295,6 @@ do { \
#define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr)
#endif
-#define __put_user_common(ptr, size) \
-do { \
- switch (size) { \
- case 1: __put_data_asm(user_sb, ptr); break; \
- case 2: __put_data_asm(user_sh, ptr); break; \
- case 4: __put_data_asm(user_sw, ptr); break; \
- case 8: __PUT_DW(user_sd, ptr); break; \
- default: __put_user_unknown(); break; \
- } \
-} while (0)
-
-#define __put_user_nocheck(x, ptr, size) \
-({ \
- __typeof__(*(ptr)) __pu_val; \
- int __pu_err = 0; \
- \
- __pu_val = (x); \
- if (eva_kernel_access()) { \
- __put_kernel_common(ptr, size); \
- } else { \
- __chk_user_ptr(ptr); \
- __put_user_common(ptr, size); \
- } \
- __pu_err; \
-})
-
-#define __put_user_check(x, ptr, size) \
-({ \
- __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
- __typeof__(*(ptr)) __pu_val = (x); \
- int __pu_err = -EFAULT; \
- \
- might_fault(); \
- if (likely(access_ok( __pu_addr, size))) { \
- if (eva_kernel_access()) \
- __put_kernel_common(__pu_addr, size); \
- else \
- __put_user_common(__pu_addr, size); \
- } \
- \
- __pu_err; \
-})
-
#define __put_data_asm(insn, ptr) \
{ \
__asm__ __volatile__( \
@@ -490,7 +333,33 @@ do { \
"i" (-EFAULT)); \
}
-extern void __put_user_unknown(void);
+#define __put_kernel_nofault(dst, src, type, err_label) \
+do { \
+ type __pu_val; \
+ int __pu_err = 0; \
+ \
+ __pu_val = *(__force type *)(src); \
+ switch (sizeof(type)) { \
+ case 1: \
+ __put_data_asm(kernel_sb, (type *)(dst)); \
+ break; \
+ case 2: \
+ __put_data_asm(kernel_sh, (type *)(dst)); \
+ break; \
+ case 4: \
+ __put_data_asm(kernel_sw, (type *)(dst)) \
+ break; \
+ case 8: \
+ __PUT_DW(kernel_sd, (type *)(dst)); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ break; \
+ } \
+ if (unlikely(__pu_err)) \
+ goto err_label; \
+} while (0)
+
/*
* We're generating jump to subroutines which will be outside the range of
@@ -514,124 +383,59 @@ extern void __put_user_unknown(void);
#define DADDI_SCRATCH "$0"
#endif
-extern size_t __copy_user(void *__to, const void *__from, size_t __n);
-
-#define __invoke_copy_from(func, to, from, n) \
-({ \
- register void *__cu_to_r __asm__("$4"); \
- register const void __user *__cu_from_r __asm__("$5"); \
- register long __cu_len_r __asm__("$6"); \
- \
- __cu_to_r = (to); \
- __cu_from_r = (from); \
- __cu_len_r = (n); \
- __asm__ __volatile__( \
- ".set\tnoreorder\n\t" \
- __MODULE_JAL(func) \
- ".set\tnoat\n\t" \
- __UA_ADDU "\t$1, %1, %2\n\t" \
- ".set\tat\n\t" \
- ".set\treorder" \
- : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
- : \
- : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
- DADDI_SCRATCH, "memory"); \
- __cu_len_r; \
-})
-
-#define __invoke_copy_to(func, to, from, n) \
-({ \
- register void __user *__cu_to_r __asm__("$4"); \
- register const void *__cu_from_r __asm__("$5"); \
- register long __cu_len_r __asm__("$6"); \
- \
- __cu_to_r = (to); \
- __cu_from_r = (from); \
- __cu_len_r = (n); \
- __asm__ __volatile__( \
- __MODULE_JAL(func) \
- : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
- : \
- : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
- DADDI_SCRATCH, "memory"); \
- __cu_len_r; \
-})
-
-#define __invoke_copy_from_kernel(to, from, n) \
- __invoke_copy_from(__copy_user, to, from, n)
-
-#define __invoke_copy_to_kernel(to, from, n) \
- __invoke_copy_to(__copy_user, to, from, n)
-
-#define ___invoke_copy_in_kernel(to, from, n) \
- __invoke_copy_from(__copy_user, to, from, n)
-
-#ifndef CONFIG_EVA
-#define __invoke_copy_from_user(to, from, n) \
- __invoke_copy_from(__copy_user, to, from, n)
-
-#define __invoke_copy_to_user(to, from, n) \
- __invoke_copy_to(__copy_user, to, from, n)
-
-#define ___invoke_copy_in_user(to, from, n) \
- __invoke_copy_from(__copy_user, to, from, n)
-
-#else
-
-/* EVA specific functions */
-
-extern size_t __copy_from_user_eva(void *__to, const void *__from,
- size_t __n);
-extern size_t __copy_to_user_eva(void *__to, const void *__from,
- size_t __n);
-extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
-
-/*
- * Source or destination address is in userland. We need to go through
- * the TLB
- */
-#define __invoke_copy_from_user(to, from, n) \
- __invoke_copy_from(__copy_from_user_eva, to, from, n)
-
-#define __invoke_copy_to_user(to, from, n) \
- __invoke_copy_to(__copy_to_user_eva, to, from, n)
-
-#define ___invoke_copy_in_user(to, from, n) \
- __invoke_copy_from(__copy_in_user_eva, to, from, n)
-
-#endif /* CONFIG_EVA */
+extern size_t __raw_copy_from_user(void *__to, const void *__from, size_t __n);
+extern size_t __raw_copy_to_user(void *__to, const void *__from, size_t __n);
static inline unsigned long
-raw_copy_to_user(void __user *to, const void *from, unsigned long n)
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
- if (eva_kernel_access())
- return __invoke_copy_to_kernel(to, from, n);
- else
- return __invoke_copy_to_user(to, from, n);
+ register void *__cu_to_r __asm__("$4");
+ register const void __user *__cu_from_r __asm__("$5");
+ register long __cu_len_r __asm__("$6");
+
+ __cu_to_r = to;
+ __cu_from_r = from;
+ __cu_len_r = n;
+
+ __asm__ __volatile__(
+ ".set\tnoreorder\n\t"
+ __MODULE_JAL(__raw_copy_from_user)
+ ".set\tnoat\n\t"
+ __UA_ADDU "\t$1, %1, %2\n\t"
+ ".set\tat\n\t"
+ ".set\treorder"
+ : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r)
+ :
+ : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31",
+ DADDI_SCRATCH, "memory");
+
+ return __cu_len_r;
}
static inline unsigned long
-raw_copy_from_user(void *to, const void __user *from, unsigned long n)
+raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
- if (eva_kernel_access())
- return __invoke_copy_from_kernel(to, from, n);
- else
- return __invoke_copy_from_user(to, from, n);
+ register void __user *__cu_to_r __asm__("$4");
+ register const void *__cu_from_r __asm__("$5");
+ register long __cu_len_r __asm__("$6");
+
+ __cu_to_r = (to);
+ __cu_from_r = (from);
+ __cu_len_r = (n);
+
+ __asm__ __volatile__(
+ __MODULE_JAL(__raw_copy_to_user)
+ : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r)
+ :
+ : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31",
+ DADDI_SCRATCH, "memory");
+
+ return __cu_len_r;
}
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
-static inline unsigned long
-raw_copy_in_user(void __user*to, const void __user *from, unsigned long n)
-{
- if (eva_kernel_access())
- return ___invoke_copy_in_kernel(to, from, n);
- else
- return ___invoke_copy_in_user(to, from, n);
-}
-
-extern __kernel_size_t __bzero_kernel(void __user *addr, __kernel_size_t size);
extern __kernel_size_t __bzero(void __user *addr, __kernel_size_t size);
/*
@@ -657,28 +461,16 @@ __clear_user(void __user *addr, __kernel_size_t size)
#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"
#endif /* CONFIG_CPU_MICROMIPS */
- if (eva_kernel_access()) {
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, $0\n\t"
- "move\t$6, %2\n\t"
- __MODULE_JAL(__bzero_kernel)
- "move\t%0, $6"
- : "=r" (res)
- : "r" (addr), "r" (size)
- : bzero_clobbers);
- } else {
- might_fault();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, $0\n\t"
- "move\t$6, %2\n\t"
- __MODULE_JAL(__bzero)
- "move\t%0, $6"
- : "=r" (res)
- : "r" (addr), "r" (size)
- : bzero_clobbers);
- }
+ might_fault();
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, $0\n\t"
+ "move\t$6, %2\n\t"
+ __MODULE_JAL(__bzero)
+ "move\t%0, $6"
+ : "=r" (res)
+ : "r" (addr), "r" (size)
+ : bzero_clobbers);
return res;
}
@@ -692,7 +484,6 @@ __clear_user(void __user *addr, __kernel_size_t size)
__cl_size; \
})
-extern long __strncpy_from_kernel_asm(char *__to, const char __user *__from, long __len);
extern long __strncpy_from_user_asm(char *__to, const char __user *__from, long __len);
/*
@@ -718,33 +509,23 @@ strncpy_from_user(char *__to, const char __user *__from, long __len)
{
long res;
- if (eva_kernel_access()) {
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, %2\n\t"
- "move\t$6, %3\n\t"
- __MODULE_JAL(__strncpy_from_kernel_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (__to), "r" (__from), "r" (__len)
- : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
- } else {
- might_fault();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, %2\n\t"
- "move\t$6, %3\n\t"
- __MODULE_JAL(__strncpy_from_user_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (__to), "r" (__from), "r" (__len)
- : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
- }
+ if (!access_ok(__from, __len))
+ return -EFAULT;
+
+ might_fault();
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ "move\t$6, %3\n\t"
+ __MODULE_JAL(__strncpy_from_user_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (__to), "r" (__from), "r" (__len)
+ : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
return res;
}
-extern long __strnlen_kernel_asm(const char __user *s, long n);
extern long __strnlen_user_asm(const char __user *s, long n);
/*
@@ -764,26 +545,18 @@ static inline long strnlen_user(const char __user *s, long n)
{
long res;
+ if (!access_ok(s, 1))
+ return 0;
+
might_fault();
- if (eva_kernel_access()) {
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, %2\n\t"
- __MODULE_JAL(__strnlen_kernel_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (s), "r" (n)
- : "$2", "$4", "$5", __UA_t0, "$31");
- } else {
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, %2\n\t"
- __MODULE_JAL(__strnlen_user_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (s), "r" (n)
- : "$2", "$4", "$5", __UA_t0, "$31");
- }
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ __MODULE_JAL(__strnlen_user_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s), "r" (n)
+ : "$2", "$4", "$5", __UA_t0, "$31");
return res;
}
generated by cgit (git 2.34.1) at 2024-05-09 15:10:27 +0000