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

From: Ingo Molnar <[email protected]>

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 <[email protected]>
Signed-off-by: Arjan van de Ven <[email protected]>
---
 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;
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Prev by Date: [patch 04/14] syslets: core, data structures
• Next by Date: [patch 08/14] syslets: x86, add create_async_thread() method
• Previous by thread: [patch 04/14] syslets: core, data structures
• Next by thread: [patch 08/14] syslets: x86, add create_async_thread() method
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]