linux-kernel - [patch 10/14] syslets: x86, mark async unsafe syscalls

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Date:	Thu, 15 Feb 2007 17:52:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [patch 10/14] syslets: x86, mark async unsafe syscalls

From: Ingo Molnar <mingo@...e.hu>

mark clone() and fork() as not available for async execution.
Both need an intact user context beneath them to work.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
 arch/i386/kernel/process.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux/arch/i386/kernel/process.c
===================================================================
--- linux.orig/arch/i386/kernel/process.c
+++ linux/arch/i386/kernel/process.c
@@ -731,6 +731,9 @@ struct task_struct fastcall * __switch_t
 
 asmlinkage int sys_fork(struct pt_regs regs)
 {
+	if (async_syscall(current))
+		return -ENOSYS;
+
 	return do_fork(SIGCHLD, regs.esp, &regs, 0, NULL, NULL);
 }
 
@@ -740,6 +743,9 @@ asmlinkage int sys_clone(struct pt_regs 
 	unsigned long newsp;
 	int __user *parent_tidptr, *child_tidptr;
 
+	if (async_syscall(current))
+		return -ENOSYS;
+
 	clone_flags = regs.ebx;
 	newsp = regs.ecx;
 	parent_tidptr = (int __user *)regs.edx;
-
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