78d832f626
When CONFIG_UTS_NS=n, clone(CLONE_NEWUTS) quietly refuses. So correctly does not unshare a new uts namespace, but also does not return -EINVAL. Fix this to return -EINVAL so the caller knows his request was denied. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
97 lines
1.7 KiB
C
97 lines
1.7 KiB
C
#ifndef _LINUX_UTSNAME_H
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#define _LINUX_UTSNAME_H
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#define __OLD_UTS_LEN 8
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struct oldold_utsname {
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char sysname[9];
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char nodename[9];
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char release[9];
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char version[9];
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char machine[9];
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};
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#define __NEW_UTS_LEN 64
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struct old_utsname {
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char sysname[65];
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char nodename[65];
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char release[65];
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char version[65];
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char machine[65];
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};
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struct new_utsname {
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char sysname[65];
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char nodename[65];
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char release[65];
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char version[65];
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char machine[65];
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char domainname[65];
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};
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#ifdef __KERNEL__
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#include <linux/sched.h>
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#include <linux/kref.h>
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#include <linux/nsproxy.h>
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#include <asm/atomic.h>
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struct uts_namespace {
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struct kref kref;
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struct new_utsname name;
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};
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extern struct uts_namespace init_uts_ns;
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static inline void get_uts_ns(struct uts_namespace *ns)
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{
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kref_get(&ns->kref);
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}
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#ifdef CONFIG_UTS_NS
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extern int unshare_utsname(unsigned long unshare_flags,
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struct uts_namespace **new_uts);
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extern int copy_utsname(int flags, struct task_struct *tsk);
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extern void free_uts_ns(struct kref *kref);
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static inline void put_uts_ns(struct uts_namespace *ns)
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{
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kref_put(&ns->kref, free_uts_ns);
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}
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#else
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static inline int unshare_utsname(unsigned long unshare_flags,
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struct uts_namespace **new_uts)
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{
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if (unshare_flags & CLONE_NEWUTS)
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return -EINVAL;
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return 0;
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}
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static inline int copy_utsname(int flags, struct task_struct *tsk)
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{
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if (flags & CLONE_NEWUTS)
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return -EINVAL;
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return 0;
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}
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static inline void put_uts_ns(struct uts_namespace *ns)
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{
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}
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#endif
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static inline struct new_utsname *utsname(void)
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{
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return ¤t->nsproxy->uts_ns->name;
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}
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static inline struct new_utsname *init_utsname(void)
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{
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return &init_uts_ns.name;
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}
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extern struct rw_semaphore uts_sem;
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#endif /* __KERNEL__ */
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#endif /* _LINUX_UTSNAME_H */
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