From 63a4a4f228c0de221779cd18c7ed9511d42c557b Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 17 May 2005 04:53:29 +0000 Subject: [PATCH] x86_64: check if ptrace RIP is canonical This works around an AMD Erratum. Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Chris Wright --- arch/x86_64/kernel/ptrace.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86_64/kernel/ptrace.c b/arch/x86_64/kernel/ptrace.c index eaa7250152f5..b2b7e347a671 100644 --- a/arch/x86_64/kernel/ptrace.c +++ b/arch/x86_64/kernel/ptrace.c @@ -149,6 +149,11 @@ static int putreg(struct task_struct *child, 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; -- cgit v1.2.3