[PATCH] Fix sigaltstack corruption among cloned threads

[linux-2.6-omap-h63xx.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index a8eab86de7f103123158f2de62481e67366a57b0..ccdfbb16c86d541f035ebb844c372c23eef053d9 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1061,6 +1061,12 @@ static task_t *copy_process(unsigned long clone_flags,
         */
        p->clear_child_tid = (clone_flags & CLONE_CHILD_CLEARTID) ? child_tidptr: NULL;
 
+       /*
+        * sigaltstack should be cleared when sharing the same VM
+        */
+       if ((clone_flags & (CLONE_VM|CLONE_VFORK)) == CLONE_VM)
+               p->sas_ss_sp = p->sas_ss_size = 0;
+
        /*
         * Syscall tracing should be turned off in the child regardless
         * of CLONE_PTRACE.