[PATCH] x86_64: check if ptrace RIP is canonical
This works around an AMD Erratum.
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
---
ptrace.c | 5 +++++
1 files changed, 5 insertions(+)
Index: release-2.6.11/arch/x86_64/kernel/ptrace.c
===================================================================
--- release-2.6.11.orig/arch/x86_64/kernel/ptrace.c
+++ release-2.6.11/arch/x86_64/kernel/ptrace.c
@@ -149,6 +149,11 @@ static int putreg(struct task_struct *ch
return -EIO;
value &= 0xffff;
break;
+ case offsetof(struct user_regs_struct, rip):
+ /* Check if the new RIP address is canonical */
+ if (value >= TASK_SIZE)
+ return -EIO;
+ break;
}
put_stack_long(child, regno - sizeof(struct pt_regs), value);
return 0;
-
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