[uml-devel] [patch 12/24] uml: Fix SKAS sig-handler reentrancy

[akpm@osdl.org]

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>,
      Jeff Dike <jdike@addtoit.com>,

This adds code which enables SIGSEGV reception to the SKAS sig_handler_common,
which matches the tt code.

I still need to figure out why the SA_NODEFER flag was backed out in favor of
this.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
CC: uml-devel <user-mode-linux-devel@lists.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 25-akpm/arch/um/kernel/skas/trap_user.c |    8 ++++++++
 1 files changed, 8 insertions(+)

diff -puN arch/um/kernel/skas/trap_user.c~uml-fix-skas-sig-handler-reentrancy arch/um/kernel/skas/trap_user.c
--- 25/arch/um/kernel/skas/trap_user.c~uml-fix-skas-sig-handler-reentrancy	2005-02-04 17:23:04.000000000 -0800
+++ 25-akpm/arch/um/kernel/skas/trap_user.c	2005-02-04 17:23:04.000000000 -0800
@@ -20,6 +20,14 @@ void sig_handler_common_skas(int sig, vo
 	int save_errno = errno;
 	int save_user;
 
+	/* This is done because to allow SIGSEGV to be delivered inside a SEGV
+	 * handler.  This can happen in copy_user, and if SEGV is disabled,
+	 * the process will die.
+	 * XXX Figure out why this is better than SA_NODEFER
+	 */
+	if(sig == SIGSEGV)
+		change_sig(SIGSEGV, 1);
+
 	r = &TASK_REGS(get_current())->skas;
 	save_user = r->is_user;
 	r->is_user = 0;
_


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