Hello All
I have searched for Maintainers List to get the correct
Maintainer for my patch. But i am not getting exact maintainer to
which i should forward my patch. Will any body please tell me,to which
maintainer i should forward my patch for its inclusion?
Summery of the Patch:
This patch Warns the administrator about the fork bombing attack
(whenever any user is crossing its process limit). I have used
printk_ratelimit function in this patch. This function helps to
prevent flooding of syslog and prints message as per the values set by
root user in following files:-
1) /proc/sys/kernel/printk_ratelimit:- This file contains value for,
how many times message should be printed in syslog.
2) /proc/sys/kernel/printk_ratelimit_burst: - This file contains value
for, after how much time message should be repeated.
This patch is really helpful for administrator/root user from security
point of view. They can take action against attacker by looking at
syslog messages related with fork bombing attack.
Added comments will definitely help developers.
Signed-Off-by: Anand Jahagirdar <[email protected]>
Index: root/Desktop/a1/linux-2.6.17.tar.bz2_FILES/linux-2.6.17/kernel/fork.c
===================================================================
--- root.orig/Desktop/a1/linux-2.6.17.tar.bz2_FILES/linux-2.6.17/kernel/fork.c 2007-06-26 20:40:06.000000000 +0530
+++ root/Desktop/a1/linux-2.6.17.tar.bz2_FILES/linux-2.6.17/kernel/fork.c 2007-06-26 20:41:41.000000000 +0530
@@ -957,12 +957,19 @@
retval = -EAGAIN;
-
+ /*
+ * following code does not allow Non Root User to cross its process
+ * limit and it alerts administrator about user Nearing the process limit.
+ */
+
if (atomic_read(&p->user->processes) >= p->signal->rlim[RLIMIT_NPROC].rlim_cur)
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
- p->user != &root_user)
+ p->user != &root_user) {
+ if (printk_ratelimit())
+ printk(KERN_WARNING "User with uid %u is Nearing the process limit\n",p->user->uid);
+
goto bad_fork_free;
-
+ }
atomic_inc(&p->user->__count);
atomic_inc(&p->user->processes);
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