Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/cache.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/pid_namespace.h>
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#include "internal.h"
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/*
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* /proc/thread_self:
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*/
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static const char *proc_thread_self_get_link(struct dentry *dentry,
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struct inode *inode,
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struct delayed_call *done)
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{
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struct pid_namespace *ns = proc_pid_ns(inode->i_sb);
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pid_t tgid = task_tgid_nr_ns(current, ns);
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pid_t pid = task_pid_nr_ns(current, ns);
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char *name;
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if (!pid)
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return ERR_PTR(-ENOENT);
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name = kmalloc(10 + 6 + 10 + 1, dentry ? GFP_KERNEL : GFP_ATOMIC);
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if (unlikely(!name))
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return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD);
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sprintf(name, "%u/task/%u", tgid, pid);
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set_delayed_call(done, kfree_link, name);
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return name;
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}
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static const struct inode_operations proc_thread_self_inode_operations = {
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.get_link = proc_thread_self_get_link,
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};
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unsigned thread_self_inum __ro_after_init;
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int proc_setup_thread_self(struct super_block *s)
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{
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struct inode *root_inode = d_inode(s->s_root);
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struct dentry *thread_self;
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int ret = -ENOMEM;
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inode_lock(root_inode);
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thread_self = d_alloc_name(s->s_root, "thread-self");
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if (thread_self) {
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struct inode *inode = new_inode(s);
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if (inode) {
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inode->i_ino = thread_self_inum;
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simple_inode_init_ts(inode);
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inode->i_mode = S_IFLNK | S_IRWXUGO;
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inode->i_uid = GLOBAL_ROOT_UID;
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inode->i_gid = GLOBAL_ROOT_GID;
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inode->i_op = &proc_thread_self_inode_operations;
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d_make_persistent(thread_self, inode);
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ret = 0;
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}
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dput(thread_self);
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}
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inode_unlock(root_inode);
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if (ret)
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pr_err("proc_fill_super: can't allocate /proc/thread-self\n");
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return ret;
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}
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void __init proc_thread_self_init(void)
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{
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proc_alloc_inum(&thread_self_inum);
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}
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