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userns: Add a limit on the number of user namespaces

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Export the export the maximum number of user namespaces as
/proc/sys/userns/max_user_namespaces.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2016-08-08 13:41:24 -05:00
parent dbec28460a
commit b376c3e1b6
4 changed files with 81 additions and 11 deletions
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2
kernel/fork.c
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@ -321,6 +321,8 @@ void __init fork_init(void)
init_task.signal->rlim[RLIMIT_NPROC].rlim_max = max_threads/2;
init_task.signal->rlim[RLIMIT_SIGPENDING] =
init_task.signal->rlim[RLIMIT_NPROC];
init_user_ns.max_user_namespaces = max_threads;
}
int __weak arch_dup_task_struct(struct task_struct *dst,