Simon Schuster
edd3cb05c0
With the introduction of clone3 in commit 7f192e3cd3 ("fork: add
clone3") the effective bit width of clone_flags on all architectures was
increased from 32-bit to 64-bit, with a new type of u64 for the flags.
However, for most consumers of clone_flags the interface was not
changed from the previous type of unsigned long.
While this works fine as long as none of the new 64-bit flag bits
(CLONE_CLEAR_SIGHAND and CLONE_INTO_CGROUP) are evaluated, this is still
undesirable in terms of the principle of least surprise.
Thus, this commit fixes all relevant interfaces of callees to
sys_clone3/copy_process (excluding the architecture-specific
copy_thread) to consistently pass clone_flags as u64, so that
no truncation to 32-bit integers occurs on 32-bit architectures.
Signed-off-by: Simon Schuster <schuster.simon@siemens-energy.com>
Link: https://lore.kernel.org/20250901-nios2-implement-clone3-v2-2-53fcf5577d57@siemens-energy.com
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
93 lines
1.8 KiB
C
93 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(u64 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(u64 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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