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userns: Generalize the user namespace count into ucount

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The same kind of recursive sane default limit and policy
countrol that has been implemented for the user namespace
is desirable for the other namespaces, so generalize
the user namespace refernce count into a ucount.

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 14:41:52 -05:00
parent f6b2db1a3e
commit 25f9c0817c
4 changed files with 49 additions and 25 deletions
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5
kernel/fork.c
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@@ -302,6 +302,7 @@ int arch_task_struct_size __read_mostly;
void __init fork_init(void)
{
int i;
#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
#ifndef ARCH_MIN_TASKALIGN
#define ARCH_MIN_TASKALIGN L1_CACHE_BYTES
@@ -322,7 +323,9 @@ void __init fork_init(void)
init_task.signal->rlim[RLIMIT_SIGPENDING] =
init_task.signal->rlim[RLIMIT_NPROC];
init_user_ns.max_user_namespaces = max_threads/2;
for (i = 0; i < UCOUNT_COUNTS; i++) {
init_user_ns.ucount_max[i] = max_threads/2;
}
}
int __weak arch_dup_task_struct(struct task_struct *dst,