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[PATCH] x86_64: check if ptrace RIP is canonical 

This works around an AMD Erratum.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Chris Wright <chrisw@osdl.org>
This commit is contained in:
Andi Kleen 2005-05-17 04:53:29 +00:00 committed by
parent 77068954f8
commit 63a4a4f228
1 changed files with 5 additions and 0 deletions
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5
arch/x86_64/kernel/ptrace.c
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@ -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;