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-rw-r--r--arch/ia64/include/asm/compat.h2
-rw-r--r--arch/mips/include/asm/compat.h2
-rw-r--r--arch/parisc/include/asm/compat.h2
-rw-r--r--arch/powerpc/include/asm/compat.h2
-rw-r--r--arch/s390/include/asm/compat.h2
-rw-r--r--arch/sparc/include/asm/compat.h2
-rw-r--r--arch/tile/include/asm/compat.h2
-rw-r--r--arch/x86/include/asm/compat.h2
-rw-r--r--include/linux/compat.h3
-rw-r--r--kernel/compat.c21
10 files changed, 32 insertions, 8 deletions
diff --git a/arch/ia64/include/asm/compat.h b/arch/ia64/include/asm/compat.h
index f90edc85b509..9301a2821615 100644
--- a/arch/ia64/include/asm/compat.h
+++ b/arch/ia64/include/asm/compat.h
@@ -199,7 +199,7 @@ ptr_to_compat(void __user *uptr)
199} 199}
200 200
201static __inline__ void __user * 201static __inline__ void __user *
202compat_alloc_user_space (long len) 202arch_compat_alloc_user_space (long len)
203{ 203{
204 struct pt_regs *regs = task_pt_regs(current); 204 struct pt_regs *regs = task_pt_regs(current);
205 return (void __user *) (((regs->r12 & 0xffffffff) & -16) - len); 205 return (void __user *) (((regs->r12 & 0xffffffff) & -16) - len);
diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h
index 613f6912dfc1..dbc51065df5b 100644
--- a/arch/mips/include/asm/compat.h
+++ b/arch/mips/include/asm/compat.h
@@ -145,7 +145,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
145 return (u32)(unsigned long)uptr; 145 return (u32)(unsigned long)uptr;
146} 146}
147 147
148static inline void __user *compat_alloc_user_space(long len) 148static inline void __user *arch_compat_alloc_user_space(long len)
149{ 149{
150 struct pt_regs *regs = (struct pt_regs *) 150 struct pt_regs *regs = (struct pt_regs *)
151 ((unsigned long) current_thread_info() + THREAD_SIZE - 32) - 1; 151 ((unsigned long) current_thread_info() + THREAD_SIZE - 32) - 1;
diff --git a/arch/parisc/include/asm/compat.h b/arch/parisc/include/asm/compat.h
index 02b77baa5da6..efa0b60c63fe 100644
--- a/arch/parisc/include/asm/compat.h
+++ b/arch/parisc/include/asm/compat.h
@@ -147,7 +147,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
147 return (u32)(unsigned long)uptr; 147 return (u32)(unsigned long)uptr;
148} 148}
149 149
150static __inline__ void __user *compat_alloc_user_space(long len) 150static __inline__ void __user *arch_compat_alloc_user_space(long len)
151{ 151{
152 struct pt_regs *regs = &current->thread.regs; 152 struct pt_regs *regs = &current->thread.regs;
153 return (void __user *)regs->gr[30]; 153 return (void __user *)regs->gr[30];
diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h
index 396d21a80058..a11d4eac4f97 100644
--- a/arch/powerpc/include/asm/compat.h
+++ b/arch/powerpc/include/asm/compat.h
@@ -134,7 +134,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
134 return (u32)(unsigned long)uptr; 134 return (u32)(unsigned long)uptr;
135} 135}
136 136
137static inline void __user *compat_alloc_user_space(long len) 137static inline void __user *arch_compat_alloc_user_space(long len)
138{ 138{
139 struct pt_regs *regs = current->thread.regs; 139 struct pt_regs *regs = current->thread.regs;
140 unsigned long usp = regs->gpr[1]; 140 unsigned long usp = regs->gpr[1];
diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h
index 104f2007f097..a875c2f542e1 100644
--- a/arch/s390/include/asm/compat.h
+++ b/arch/s390/include/asm/compat.h
@@ -181,7 +181,7 @@ static inline int is_compat_task(void)
181 181
182#endif 182#endif
183 183
184static inline void __user *compat_alloc_user_space(long len) 184static inline void __user *arch_compat_alloc_user_space(long len)
185{ 185{
186 unsigned long stack; 186 unsigned long stack;
187 187
diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h
index 5016f76ea98a..6f57325bb883 100644
--- a/arch/sparc/include/asm/compat.h
+++ b/arch/sparc/include/asm/compat.h
@@ -167,7 +167,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
167 return (u32)(unsigned long)uptr; 167 return (u32)(unsigned long)uptr;
168} 168}
169 169
170static inline void __user *compat_alloc_user_space(long len) 170static inline void __user *arch_compat_alloc_user_space(long len)
171{ 171{
172 struct pt_regs *regs = current_thread_info()->kregs; 172 struct pt_regs *regs = current_thread_info()->kregs;
173 unsigned long usp = regs->u_regs[UREG_I6]; 173 unsigned long usp = regs->u_regs[UREG_I6];
diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h
index 5a34da6cdd79..345d81ce44bb 100644
--- a/arch/tile/include/asm/compat.h
+++ b/arch/tile/include/asm/compat.h
@@ -195,7 +195,7 @@ static inline unsigned long ptr_to_compat_reg(void __user *uptr)
195 return (long)(int)(long __force)uptr; 195 return (long)(int)(long __force)uptr;
196} 196}
197 197
198static inline void __user *compat_alloc_user_space(long len) 198static inline void __user *arch_compat_alloc_user_space(long len)
199{ 199{
200 struct pt_regs *regs = task_pt_regs(current); 200 struct pt_regs *regs = task_pt_regs(current);
201 return (void __user *)regs->sp - len; 201 return (void __user *)regs->sp - len;
diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
index 306160e58b48..1d9cd27c2920 100644
--- a/arch/x86/include/asm/compat.h
+++ b/arch/x86/include/asm/compat.h
@@ -205,7 +205,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
205 return (u32)(unsigned long)uptr; 205 return (u32)(unsigned long)uptr;
206} 206}
207 207
208static inline void __user *compat_alloc_user_space(long len) 208static inline void __user *arch_compat_alloc_user_space(long len)
209{ 209{
210 struct pt_regs *regs = task_pt_regs(current); 210 struct pt_regs *regs = task_pt_regs(current);
211 return (void __user *)regs->sp - len; 211 return (void __user *)regs->sp - len;
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 9ddc8780e8db..5778b559d59c 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -360,5 +360,8 @@ extern ssize_t compat_rw_copy_check_uvector(int type,
360 const struct compat_iovec __user *uvector, unsigned long nr_segs, 360 const struct compat_iovec __user *uvector, unsigned long nr_segs,
361 unsigned long fast_segs, struct iovec *fast_pointer, 361 unsigned long fast_segs, struct iovec *fast_pointer,
362 struct iovec **ret_pointer); 362 struct iovec **ret_pointer);
363
364extern void __user *compat_alloc_user_space(unsigned long len);
365
363#endif /* CONFIG_COMPAT */ 366#endif /* CONFIG_COMPAT */
364#endif /* _LINUX_COMPAT_H */ 367#endif /* _LINUX_COMPAT_H */
diff --git a/kernel/compat.c b/kernel/compat.c
index e167efce8423..c9e2ec0b34a8 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -1126,3 +1126,24 @@ compat_sys_sysinfo(struct compat_sysinfo __user *info)
1126 1126
1127 return 0; 1127 return 0;
1128} 1128}
1129
1130/*
1131 * Allocate user-space memory for the duration of a single system call,
1132 * in order to marshall parameters inside a compat thunk.
1133 */
1134void __user *compat_alloc_user_space(unsigned long len)
1135{
1136 void __user *ptr;
1137
1138 /* If len would occupy more than half of the entire compat space... */
1139 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1140 return NULL;
1141
1142 ptr = arch_compat_alloc_user_space(len);
1143
1144 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1145 return NULL;
1146
1147 return ptr;
1148}
1149EXPORT_SYMBOL_GPL(compat_alloc_user_space);