[PATCH] Clear TLS on execve

From: Luca Barbieri (ldb@ldb.ods.org)
Date: Thu Oct 31 2002 - 09:34:39 EST

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=/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 14:23:18.000000000 +0100
@@ -247,6 +247,7 @@ void flush_thread(void)
         struct task_struct *tsk = current;
 
         memset(tsk->thread.debugreg, 0, sizeof(unsigned long)*8);
+ memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));
         /*
          * Forget coprocessor state..
          */


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This archive was generated by hypermail 2b29 : Thu Oct 31 2002 - 22:00:53 EST