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Date: Thu, 31 Oct 2002 15:34:39 +0100
From: Luca Barbieri <ldb@ldb.ods.org>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Linux-Kernel ML <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
Subject: [PATCH] Clear TLS on execve
Message-ID: <20021031143439.GA1697@home.ldb.ods.org>
Mail-Followup-To: Linus Torvalds <torvalds@transmeta.com>,
	Linux-Kernel ML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@elte.hu>
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This trivial patch causes the TLS to be cleared on execve (code is in flush=
_thread).
This is necessary to avoid ESRCH errors when set_thread_area is asked
to choose a free TLS entry after several nested execve's.

The LDT also has a similar problem, but it is less serious because the
LDT code doesn't scan for free entries. I'll probably send a patch to
fix this too, unless there is something important relying on this behavior.

diff --exclude-from=3D/home/ldb/src/linux-exclude -urNdp linux-2.5.45/arch/=
i386/kernel/process.c linux-2.5.45_ldb/arch/i386/kernel/process.c
--- linux-2.5.45/arch/i386/kernel/process.c	2002-10-12 06:21:02.000000000 +=
0200
+++ linux-2.5.45_ldb/arch/i386/kernel/process.c	2002-10-31 14:23:18.0000000=
00 +0100
@@ -247,6 +247,7 @@ void flush_thread(void)
 	struct task_struct *tsk =3D current;
=20
 	memset(tsk->thread.debugreg, 0, sizeof(unsigned long)*8);
+	memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));=09
 	/*
 	 * Forget coprocessor state..
 	 */

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