I think it's necessary to reserve some pids to the super user.
5 must be sufficient.
Signed-off-by: Gustavo Chain <[email protected]>
---
kernel/fork.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index 33f12f4..db23cb3 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1367,11 +1367,17 @@ long do_fork(unsigned long clone_flags,
int __user *parent_tidptr,
int __user *child_tidptr)
{
+#define RESERVED_PIDS 5
+
struct task_struct *p;
int trace = 0;
struct pid *pid = alloc_pid();
long nr;
+ if (!capable(CAP_SYS_ADMIN) && nr_threads >= max_threads
- RESERVED_PIDS) {
+ return -EAGAIN;
+ }
+
if (!pid)
return -EAGAIN;
nr = pid->nr;
--
Gustavo Chaín Dumit
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