linux-kernel - Re: utrace regressions (was: -mm merge plans for 2.6.21)

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Message-ID: <20070213153521.GA6036@localhost.sw.ru>
Date:	Tue, 13 Feb 2007 18:35:21 +0300
From:	Alexey Dobriyan <adobriyan@...nvz.org>
To:	Roland McGrath <roland@...hat.com>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org, devel@...nvz.org
Subject: Re: utrace regressions (was: -mm merge plans for 2.6.21)

On Mon, Feb 12, 2007 at 01:36:34PM -0800, Roland McGrath wrote:
> > We're aware of two regressions compared to mainline if ptrace is utrace:
>
> Thanks very much for bringing these to my attention.
>
> > 1) zero holes for PTRACE_PEEKUSR vanished.
>
> I've fixed this in the current patches.

Looking at mainline x86_64 ptrace code I think hole for u_debugreg[4]
and [5] is also needed.

--- a/arch/x86_64/kernel/ptrace.c
+++ b/arch/x86_64/kernel/ptrace.c
@@ -687,6 +687,8 @@ EXPORT_SYMBOL_GPL(utrace_x86_64_native);
 #ifdef CONFIG_PTRACE
 static const struct ptrace_layout_segment x86_64_uarea[] = {
 	{0, sizeof(struct user_regs_struct), 0, 0},
+	{sizeof(struct user_regs_struct),
+	 offsetof(struct user, u_debugreg[0]), -1, 0},
 	{offsetof(struct user, u_debugreg[0]),
 	 offsetof(struct user, u_debugreg[4]), 3, 0},
 	{offsetof(struct user, u_debugreg[6]),

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