linux-kernel - [PATCH] Reserve N process to root

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20071009194820.6c8d6e8d@0xff.cl>
Date:	Tue, 9 Oct 2007 19:48:20 -0400
From:	Gustavo Chain <g@...f.cl>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] Reserve N process to root

I think it's necessary to reserve some pids to the super user.
5 must be sufficient.

Signed-off-by: Gustavo Chain <g@...f.cl>
---
 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/