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Commit d1099e8a authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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[PATCH] x86_64: check if ptrace RIP is canonical 



This works around an AMD Erratum.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 312df5f1

arch/x86_64/kernel/ptrace.c

+5 −0
Original line number Diff line number Diff line
@@ -277,6 +277,11 @@ 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;