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| author | Eric W. Biederman <ebiederm@xmission.com> | 2016-08-08 21:41:24 +0300 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2016-08-08 21:41:24 +0300 |
| commit | b376c3e1b6770ddcb4f0782be16358095fcea0b6 (patch) | |
| tree | 30789f9f1e84abe4d25a52e2fcad209504c181bf /include/linux/user_namespace.h | |
| parent | dbec28460a89aa7c02c3301e9e108d98272549d2 (diff) | |
| download | linux-b376c3e1b6770ddcb4f0782be16358095fcea0b6.tar.xz | |
userns: Add a limit on the number of user namespaces
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>
Diffstat (limited to 'include/linux/user_namespace.h')
| -rw-r--r-- | include/linux/user_namespace.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h index e5697eaf6bf9..6421cca2daa9 100644 --- a/include/linux/user_namespace.h +++ b/include/linux/user_namespace.h @@ -44,9 +44,15 @@ struct user_namespace { struct ctl_table_set set; struct ctl_table_header *sysctls; #endif + int max_user_namespaces; + atomic_t user_namespaces; }; extern struct user_namespace init_user_ns; +extern bool setup_userns_sysctls(struct user_namespace *ns); +extern void retire_userns_sysctls(struct user_namespace *ns); +extern bool inc_user_namespaces(struct user_namespace *ns); +extern void dec_user_namespaces(struct user_namespace *ns); #ifdef CONFIG_USER_NS |