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userns: Add per user namespace sysctls.

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Limit per userns sysctls to only be opened for write by a holder
of CAP_SYS_RESOURCE.

Add all of the necessary boilerplate for having per user namespace
sysctls.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2016-07-30 13:58:49 -05:00
parent b032132c3c
commit dbec28460a
4 changed files with 120 additions and 3 deletions
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4
include/linux/user_namespace.h
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@@ -40,6 +40,10 @@ struct user_namespace {
struct rw_semaphore persistent_keyring_register_sem;
#endif
struct work_struct work;
#ifdef CONFIG_SYSCTL
struct ctl_table_set set;
struct ctl_table_header *sysctls;
#endif
};
extern struct user_namespace init_user_ns;