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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/init.h>#include <linux/sched.h>#include <linux/fs.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <asm/errno.h>#include "internal.h"
static void *proc_keys_start(struct seq_file *p, loff_t *_pos);static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);static void proc_keys_stop(struct seq_file *p, void *v);static int proc_keys_show(struct seq_file *m, void *v);
static const struct seq_operations proc_keys_ops = { .start = proc_keys_start, .next = proc_keys_next, .stop = proc_keys_stop, .show = proc_keys_show,};
static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);static void proc_key_users_stop(struct seq_file *p, void *v);static int proc_key_users_show(struct seq_file *m, void *v);
static const struct seq_operations proc_key_users_ops = { .start = proc_key_users_start, .next = proc_key_users_next, .stop = proc_key_users_stop, .show = proc_key_users_show,};
/* * Declare the /proc files. */static int __init key_proc_init(void){ struct proc_dir_entry *p;
p = proc_create_seq("keys", 0, NULL, &proc_keys_ops); if (!p) panic("Cannot create /proc/keys\n");
p = proc_create_seq("key-users", 0, NULL, &proc_key_users_ops); if (!p) panic("Cannot create /proc/key-users\n");
return 0;}
__initcall(key_proc_init);
/* * Implement "/proc/keys" to provide a list of the keys on the system that * grant View permission to the caller. */static struct rb_node *key_serial_next(struct seq_file *p, struct rb_node *n){ struct user_namespace *user_ns = seq_user_ns(p);
n = rb_next(n); while (n) { struct key *key = rb_entry(n, struct key, serial_node); if (kuid_has_mapping(user_ns, key->uid)) break; n = rb_next(n); } return n;}
static struct key *find_ge_key(struct seq_file *p, key_serial_t id){ struct user_namespace *user_ns = seq_user_ns(p); struct rb_node *n = key_serial_tree.rb_node; struct key *minkey = NULL;
while (n) { struct key *key = rb_entry(n, struct key, serial_node); if (id < key->serial) { if (!minkey || minkey->serial > key->serial) minkey = key; n = n->rb_left; } else if (id > key->serial) { n = n->rb_right; } else { minkey = key; break; } key = NULL; }
if (!minkey) return NULL;
for (;;) { if (kuid_has_mapping(user_ns, minkey->uid)) return minkey; n = rb_next(&minkey->serial_node); if (!n) return NULL; minkey = rb_entry(n, struct key, serial_node); }}
static void *proc_keys_start(struct seq_file *p, loff_t *_pos) __acquires(key_serial_lock){ key_serial_t pos = *_pos; struct key *key;
spin_lock(&key_serial_lock);
if (*_pos > INT_MAX) return NULL; key = find_ge_key(p, pos); if (!key) return NULL; *_pos = key->serial; return &key->serial_node;}
static inline key_serial_t key_node_serial(struct rb_node *n){ struct key *key = rb_entry(n, struct key, serial_node); return key->serial;}
static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos){ struct rb_node *n;
n = key_serial_next(p, v); if (n) *_pos = key_node_serial(n); else (*_pos)++; return n;}
static void proc_keys_stop(struct seq_file *p, void *v) __releases(key_serial_lock){ spin_unlock(&key_serial_lock);}
static int proc_keys_show(struct seq_file *m, void *v){ struct rb_node *_p = v; struct key *key = rb_entry(_p, struct key, serial_node); unsigned long flags; key_ref_t key_ref, skey_ref; time64_t now, expiry; char xbuf[16]; short state; u64 timo; int rc;
struct keyring_search_context ctx = { .index_key = key->index_key, .cred = m->file->f_cred, .match_data.cmp = lookup_user_key_possessed, .match_data.raw_data = key, .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT, .flags = (KEYRING_SEARCH_NO_STATE_CHECK | KEYRING_SEARCH_RECURSE), };
key_ref = make_key_ref(key, 0);
/* determine if the key is possessed by this process (a test we can * skip if the key does not indicate the possessor can view it */ if (key->perm & KEY_POS_VIEW) { rcu_read_lock(); skey_ref = search_cred_keyrings_rcu(&ctx); rcu_read_unlock(); if (!IS_ERR(skey_ref)) { key_ref_put(skey_ref); key_ref = make_key_ref(key, 1); } }
/* check whether the current task is allowed to view the key */ rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW); if (rc < 0) return 0;
now = ktime_get_real_seconds();
rcu_read_lock();
/* come up with a suitable timeout value */ expiry = READ_ONCE(key->expiry); if (expiry == TIME64_MAX) { memcpy(xbuf, "perm", 5); } else if (now >= expiry) { memcpy(xbuf, "expd", 5); } else { timo = expiry - now;
if (timo < 60) sprintf(xbuf, "%llus", timo); else if (timo < 60*60) sprintf(xbuf, "%llum", div_u64(timo, 60)); else if (timo < 60*60*24) sprintf(xbuf, "%lluh", div_u64(timo, 60 * 60)); else if (timo < 60*60*24*7) sprintf(xbuf, "%llud", div_u64(timo, 60 * 60 * 24)); else sprintf(xbuf, "%lluw", div_u64(timo, 60 * 60 * 24 * 7)); }
state = key_read_state(key);
#define showflag(FLAGS, LETTER, FLAG) \ ((FLAGS & (1 << FLAG)) ? LETTER : '-')
flags = READ_ONCE(key->flags); seq_printf(m, "%08x %c%c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ", key->serial, state != KEY_IS_UNINSTANTIATED ? 'I' : '-', showflag(flags, 'R', KEY_FLAG_REVOKED), showflag(flags, 'D', KEY_FLAG_DEAD), showflag(flags, 'Q', KEY_FLAG_IN_QUOTA), showflag(flags, 'U', KEY_FLAG_USER_CONSTRUCT), state < 0 ? 'N' : '-', showflag(flags, 'i', KEY_FLAG_INVALIDATED), refcount_read(&key->usage), xbuf, key->perm, from_kuid_munged(seq_user_ns(m), key->uid), from_kgid_munged(seq_user_ns(m), key->gid), key->type->name);
#undef showflag
if (key->type->describe) key->type->describe(key, m); seq_putc(m, '\n');
rcu_read_unlock(); return 0;}
static struct rb_node *__key_user_next(struct user_namespace *user_ns, struct rb_node *n){ while (n) { struct key_user *user = rb_entry(n, struct key_user, node); if (kuid_has_mapping(user_ns, user->uid)) break; n = rb_next(n); } return n;}
static struct rb_node *key_user_next(struct user_namespace *user_ns, struct rb_node *n){ return __key_user_next(user_ns, rb_next(n));}
static struct rb_node *key_user_first(struct user_namespace *user_ns, struct rb_root *r){ struct rb_node *n = rb_first(r); return __key_user_next(user_ns, n);}
static void *proc_key_users_start(struct seq_file *p, loff_t *_pos) __acquires(key_user_lock){ struct rb_node *_p; loff_t pos = *_pos;
spin_lock(&key_user_lock);
_p = key_user_first(seq_user_ns(p), &key_user_tree); while (pos > 0 && _p) { pos--; _p = key_user_next(seq_user_ns(p), _p); }
return _p;}
static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos){ (*_pos)++; return key_user_next(seq_user_ns(p), (struct rb_node *)v);}
static void proc_key_users_stop(struct seq_file *p, void *v) __releases(key_user_lock){ spin_unlock(&key_user_lock);}
static int proc_key_users_show(struct seq_file *m, void *v){ struct rb_node *_p = v; struct key_user *user = rb_entry(_p, struct key_user, node); unsigned maxkeys = uid_eq(user->uid, GLOBAL_ROOT_UID) ? key_quota_root_maxkeys : key_quota_maxkeys; unsigned maxbytes = uid_eq(user->uid, GLOBAL_ROOT_UID) ? key_quota_root_maxbytes : key_quota_maxbytes;
seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", from_kuid_munged(seq_user_ns(m), user->uid), refcount_read(&user->usage), atomic_read(&user->nkeys), atomic_read(&user->nikeys), user->qnkeys, maxkeys, user->qnbytes, maxbytes);
return 0;}