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52826d3b2d
Commitbfca3dd3d0("kernel/utsname_sysctl.c: print kernel arch") added a new entry to the uts_kern_table[] array, but didn't update the UTS_PROC_xyz enumerators of older entries, breaking anything that used them. Which is admittedly not many cases: it's really just the two uses of uts_proc_notify() in kernel/sys.c. But apparently journald-systemd actually uses this to detect hostname changes. Reported-by: Torsten Hilbrich <torsten.hilbrich@secunet.com> Fixes:bfca3dd3d0("kernel/utsname_sysctl.c: print kernel arch") Link: https://lore.kernel.org/lkml/0c2b92a6-0f25-9538-178f-eee3b06da23f@secunet.com/ Link: https://linux-regtracking.leemhuis.info/regzbot/regression/0c2b92a6-0f25-9538-178f-eee3b06da23f@secunet.com/ Cc: Petr Vorel <pvorel@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
92 lines
1.8 KiB
C
92 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_UTSNAME_H
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#define _LINUX_UTSNAME_H
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#include <linux/sched.h>
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#include <linux/nsproxy.h>
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#include <linux/ns_common.h>
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#include <linux/err.h>
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#include <uapi/linux/utsname.h>
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enum uts_proc {
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UTS_PROC_ARCH,
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UTS_PROC_OSTYPE,
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UTS_PROC_OSRELEASE,
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UTS_PROC_VERSION,
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UTS_PROC_HOSTNAME,
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UTS_PROC_DOMAINNAME,
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};
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struct user_namespace;
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extern struct user_namespace init_user_ns;
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struct uts_namespace {
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struct new_utsname name;
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struct user_namespace *user_ns;
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struct ucounts *ucounts;
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struct ns_common ns;
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} __randomize_layout;
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extern struct uts_namespace init_uts_ns;
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#ifdef CONFIG_UTS_NS
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static inline void get_uts_ns(struct uts_namespace *ns)
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{
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refcount_inc(&ns->ns.count);
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}
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extern struct uts_namespace *copy_utsname(unsigned long flags,
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struct user_namespace *user_ns, struct uts_namespace *old_ns);
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extern void free_uts_ns(struct uts_namespace *ns);
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static inline void put_uts_ns(struct uts_namespace *ns)
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{
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if (refcount_dec_and_test(&ns->ns.count))
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free_uts_ns(ns);
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}
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void uts_ns_init(void);
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#else
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static inline void get_uts_ns(struct uts_namespace *ns)
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{
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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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static inline struct uts_namespace *copy_utsname(unsigned long flags,
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struct user_namespace *user_ns, struct uts_namespace *old_ns)
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{
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if (flags & CLONE_NEWUTS)
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return ERR_PTR(-EINVAL);
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return old_ns;
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}
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static inline void uts_ns_init(void)
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{
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}
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#endif
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#ifdef CONFIG_PROC_SYSCTL
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extern void uts_proc_notify(enum uts_proc proc);
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#else
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static inline void uts_proc_notify(enum uts_proc proc)
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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 /* _LINUX_UTSNAME_H */
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