[PATCH][2.6.8-rc2-mm1] x86_64 signal handling fix

[Mikael Pettersson]

The signal-race-fixes patch in 2.6.8-rc2-mm1 appears to
have broken x86-64's ia32 emulation.

When forcing a SIGSEGV the old code updated "*ka", where
ka was a pointer to current's k_sigaction for SIGSEGV.
Now "ka_copy" points to a copy of that structure, so
assigning "*ka_copy" doesn't do what we want. Instead
do the assignment via current->... just like the normal
signal delivery code does.

/Mikael Pettersson

diff -rupN linux-2.6.8-rc2-mm1/arch/x86_64/ia32/ia32_signal.c linux-2.6.8-rc2-mm1.x86_64-signal-fixes/arch/x86_64/ia32/ia32_signal.c
--- linux-2.6.8-rc2-mm1/arch/x86_64/ia32/ia32_signal.c	2004-07-28 18:51:59.000000000 +0200
+++ linux-2.6.8-rc2-mm1.x86_64-signal-fixes/arch/x86_64/ia32/ia32_signal.c	2004-07-28 23:40:49.107995240 +0200
@@ -495,7 +495,7 @@ void ia32_setup_frame(int sig, struct k_
 
 give_sigsegv:
 	if (sig == SIGSEGV)
-		ka_copy->sa.sa_handler = SIG_DFL;
+		current->sighand->action[SIGSEGV-1].sa.sa_handler = SIG_DFL;
 	signal_fault(regs,frame,"32bit signal deliver");
 }
 
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