123 lines
4.2 KiB
Diff
123 lines
4.2 KiB
Diff
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--- linux-2.6.33-sabayon.orig/arch/ia64/include/asm/compat.h
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+++ linux-2.6.33-sabayon/arch/ia64/include/asm/compat.h
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@@ -198,7 +198,7 @@ ptr_to_compat(void __user *uptr)
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}
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static __inline__ void __user *
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-compat_alloc_user_space (long len)
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+arch_compat_alloc_user_space (long len)
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{
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struct pt_regs *regs = task_pt_regs(current);
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return (void __user *) (((regs->r12 & 0xffffffff) & -16) - len);
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--- linux-2.6.33-sabayon.orig/arch/mips/include/asm/compat.h
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+++ linux-2.6.33-sabayon/arch/mips/include/asm/compat.h
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@@ -144,7 +144,7 @@ static inline compat_uptr_t ptr_to_compa
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return (u32)(unsigned long)uptr;
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}
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-static inline void __user *compat_alloc_user_space(long len)
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+static inline void __user *arch_compat_alloc_user_space(long len)
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{
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struct pt_regs *regs = (struct pt_regs *)
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((unsigned long) current_thread_info() + THREAD_SIZE - 32) - 1;
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--- linux-2.6.33-sabayon.orig/arch/parisc/include/asm/compat.h
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+++ linux-2.6.33-sabayon/arch/parisc/include/asm/compat.h
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@@ -146,7 +146,7 @@ static inline compat_uptr_t ptr_to_compa
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return (u32)(unsigned long)uptr;
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}
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-static __inline__ void __user *compat_alloc_user_space(long len)
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+static __inline__ void __user *arch_compat_alloc_user_space(long len)
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{
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struct pt_regs *regs = ¤t->thread.regs;
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return (void __user *)regs->gr[30];
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--- linux-2.6.33-sabayon.orig/arch/powerpc/include/asm/compat.h
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+++ linux-2.6.33-sabayon/arch/powerpc/include/asm/compat.h
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@@ -133,7 +133,7 @@ static inline compat_uptr_t ptr_to_compa
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return (u32)(unsigned long)uptr;
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}
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-static inline void __user *compat_alloc_user_space(long len)
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+static inline void __user *arch_compat_alloc_user_space(long len)
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{
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struct pt_regs *regs = current->thread.regs;
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unsigned long usp = regs->gpr[1];
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--- linux-2.6.33-sabayon.orig/arch/s390/include/asm/compat.h
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+++ linux-2.6.33-sabayon/arch/s390/include/asm/compat.h
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@@ -180,7 +180,7 @@ static inline int is_compat_task(void)
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#endif
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-static inline void __user *compat_alloc_user_space(long len)
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+static inline void __user *arch_compat_alloc_user_space(long len)
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{
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unsigned long stack;
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--- linux-2.6.33-sabayon.orig/arch/sparc/include/asm/compat.h
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+++ linux-2.6.33-sabayon/arch/sparc/include/asm/compat.h
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@@ -166,7 +166,7 @@ static inline compat_uptr_t ptr_to_compa
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return (u32)(unsigned long)uptr;
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}
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-static inline void __user *compat_alloc_user_space(long len)
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+static inline void __user *arch_compat_alloc_user_space(long len)
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{
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struct pt_regs *regs = current_thread_info()->kregs;
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unsigned long usp = regs->u_regs[UREG_I6];
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--- linux-2.6.33-sabayon.orig/arch/x86/include/asm/compat.h
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+++ linux-2.6.33-sabayon/arch/x86/include/asm/compat.h
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@@ -204,7 +204,7 @@ static inline compat_uptr_t ptr_to_compa
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return (u32)(unsigned long)uptr;
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}
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-static inline void __user *compat_alloc_user_space(long len)
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+static inline void __user *arch_compat_alloc_user_space(long len)
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{
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struct pt_regs *regs = task_pt_regs(current);
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return (void __user *)regs->sp - len;
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--- linux-2.6.33-sabayon.orig/include/linux/compat.h
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+++ linux-2.6.33-sabayon/include/linux/compat.h
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@@ -353,5 +353,7 @@ asmlinkage long compat_sys_newfstatat(un
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asmlinkage long compat_sys_openat(unsigned int dfd, const char __user *filename,
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int flags, int mode);
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+extern void __user *compat_alloc_user_space(unsigned long len);
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+
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#endif /* CONFIG_COMPAT */
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#endif /* _LINUX_COMPAT_H */
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--- linux-2.6.33-sabayon.orig/kernel/compat.c
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+++ linux-2.6.33-sabayon/kernel/compat.c
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@@ -22,6 +22,7 @@
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#include <linux/security.h>
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#include <linux/timex.h>
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#include <linux/migrate.h>
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+#include <linux/module.h>
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#include <linux/posix-timers.h>
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#include <linux/times.h>
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#include <linux/ptrace.h>
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@@ -1139,3 +1140,24 @@ compat_sys_sysinfo(struct compat_sysinfo
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return 0;
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}
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+
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+/*
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+ * Allocate user-space memory for the duration of a single system call,
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+ * in order to marshall parameters inside a compat thunk.
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+ */
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+void __user *compat_alloc_user_space(unsigned long len)
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+{
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+ void __user *ptr;
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+
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+ /* If len would occupy more than half of the entire compat space... */
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+ if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
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+ return NULL;
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+
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+ ptr = arch_compat_alloc_user_space(len);
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+
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+ if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
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+ return NULL;
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+
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+ return ptr;
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+}
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+EXPORT_SYMBOL_GPL(compat_alloc_user_space);
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