mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-14 22:12:14 +01:00
Badari Pulavarty
e3222c4ecc
sys_clone() and sys_unshare() both makes copies of nsproxy and its associated namespaces. But they have different code paths. This patch merges all the nsproxy and its associated namespace copy/clone handling (as much as possible). Posted on container list earlier for feedback. - Create a new nsproxy and its associated namespaces and pass it back to caller to attach it to right process. - Changed all copy_*_ns() routines to return a new copy of namespace instead of attaching it to task->nsproxy. - Moved the CAP_SYS_ADMIN checks out of copy_*_ns() routines. - Removed unnessary !ns checks from copy_*_ns() and added BUG_ON() just incase. - Get rid of all individual unshare_*_ns() routines and make use of copy_*_ns() instead. [[email protected]: cleanups, warning fix] [[email protected]: remove dup_namespaces() declaration] [[email protected]: fix CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) retval] [[email protected]: fix build with CONFIG_SYSVIPC=n] Signed-off-by: Badari Pulavarty <[email protected]> Signed-off-by: Serge Hallyn <[email protected]> Cc: Cedric Le Goater <[email protected]> Cc: "Eric W. Biederman" <[email protected]> Cc: <[email protected]> Signed-off-by: Cedric Le Goater <[email protected]> Cc: Oleg Nesterov <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
86 lines
1.5 KiB
C
86 lines
1.5 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 struct uts_namespace *copy_utsname(int flags, struct uts_namespace *ns);
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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 struct uts_namespace *copy_utsname(int flags,
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struct uts_namespace *ns)
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{
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return ns;
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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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