cregit-Linux how code gets into the kernel

Release 4.11 ipc/util.c

Directory: ipc
 * linux/ipc/util.c
 * Copyright (C) 1992 Krishna Balasubramanian
 * Sep 1997 - Call suser() last after "normal" permission checks so we
 *            get BSD style process accounting right.
 *            Occurs in several places in the IPC code.
 *            Chris Evans, <>
 * Nov 1999 - ipc helper functions, unified SMP locking
 *            Manfred Spraul <>
 * Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary().
 *            Mingming Cao <>
 * Mar 2006 - support for audit of ipc object properties
 *            Dustin Kirkland <>
 * Jun 2006 - namespaces ssupport
 *            OpenVZ, SWsoft Inc.
 *            Pavel Emelianov <>
 * General sysv ipc locking scheme:
 *      rcu_read_lock()
 *          obtain the ipc object (kern_ipc_perm) by looking up the id in an idr
 *          tree.
 *          - perform initial checks (capabilities, auditing and permission,
 *            etc).
 *          - perform read-only operations, such as STAT, INFO commands.
 *            acquire the ipc lock (kern_ipc_perm.lock) through
 *            ipc_lock_object()
 *              - perform data updates, such as SET, RMID commands and
 *                mechanism-specific operations (semop/semtimedop,
 *                msgsnd/msgrcv, shmat/shmdt).
 *          drop the ipc lock, through ipc_unlock_object().
 *      rcu_read_unlock()
 *  The ids->rwsem must be taken when:
 *      - creating, removing and iterating the existing entries in ipc
 *        identifier sets.
 *      - iterating through files under /proc/sysvipc/
 *  Note that sems have a special fast path that avoids kern_ipc_perm.lock -
 *  see sem_lock().

#include <linux/mm.h>
#include <linux/shm.h>
#include <linux/init.h>
#include <linux/msg.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/capability.h>
#include <linux/highuid.h>
#include <linux/security.h>
#include <linux/rcupdate.h>
#include <linux/workqueue.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/audit.h>
#include <linux/nsproxy.h>
#include <linux/rwsem.h>
#include <linux/memory.h>
#include <linux/ipc_namespace.h>

#include <asm/unistd.h>

#include "util.h"

struct ipc_proc_iface {
const char *path;
const char *header;
int ids;
int (*show)(struct seq_file *, void *);

 * ipc_init - initialise ipc subsystem
 * The various sysv ipc resources (semaphores, messages and shared
 * memory) are initialised.
 * A callback routine is registered into the memory hotplug notifier
 * chain: since msgmni scales to lowmem this callback routine will be
 * called upon successful memory add / remove to recompute msmgni.

static int __init ipc_init(void) { sem_init(); msg_init(); shm_init(); return 0; }


Linus Torvalds (pre-git)1676.19%266.67%
Andrew Morton523.81%133.33%

device_initcall(ipc_init); /** * ipc_init_ids - initialise ipc identifiers * @ids: ipc identifier set * * Set up the sequence range to use for the ipc identifier range (limited * below IPCMNI) then initialise the ids idr. */
void ipc_init_ids(struct ipc_ids *ids) { ids->in_use = 0; ids->seq = 0; ids->next_id = -1; init_rwsem(&ids->rwsem); idr_init(&ids->ipcs_idr); }


Linus Torvalds (pre-git)2760.00%233.33%
Stanislav Kinsbursky715.56%116.67%
Davidlohr Bueso A511.11%116.67%
Paul E. McKenney36.67%116.67%
Nadia Derbey36.67%116.67%

#ifdef CONFIG_PROC_FS static const struct file_operations sysvipc_proc_fops; /** * ipc_init_proc_interface - create a proc interface for sysipc types using a seq_file interface. * @path: Path in procfs * @header: Banner to be printed at the beginning of the file. * @ids: ipc id table to iterate. * @show: show routine. */
void __init ipc_init_proc_interface(const char *path, const char *header, int ids, int (*show)(struct seq_file *, void *)) { struct proc_dir_entry *pde; struct ipc_proc_iface *iface; iface = kmalloc(sizeof(*iface), GFP_KERNEL); if (!iface) return; iface->path = path; iface->header = header; iface->ids = ids; iface->show = show; pde = proc_create_data(path, S_IRUGO, /* world readable */ NULL, /* parent dir */ &sysvipc_proc_fops, iface); if (!pde) kfree(iface); }


Mike Waychison10692.98%133.33%
Denis V. Lunev76.14%133.33%
Kirill Korotaev10.88%133.33%

#endif /** * ipc_findkey - find a key in an ipc identifier set * @ids: ipc identifier set * @key: key to find * * Returns the locked pointer to the ipc structure if found or NULL * otherwise. If key is found ipc points to the owning ipc structure * * Called with ipc_ids.rwsem held. */
static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key) { struct kern_ipc_perm *ipc; int next_id; int total; for (total = 0, next_id = 0; total < ids->in_use; next_id++) { ipc = idr_find(&ids->ipcs_idr, next_id); if (ipc == NULL) continue; if (ipc->key != key) { total++; continue; } rcu_read_lock(); ipc_lock_object(ipc); return ipc; } return NULL; }


Linus Torvalds (pre-git)4547.37%233.33%
Nadia Derbey4446.32%233.33%
Davidlohr Bueso A44.21%116.67%
Andrew Morton22.11%116.67%

/** * ipc_get_maxid - get the last assigned id * @ids: ipc identifier set * * Called with ipc_ids.rwsem held. */
int ipc_get_maxid(struct ipc_ids *ids) { struct kern_ipc_perm *ipc; int max_id = -1; int total, id; if (ids->in_use == 0) return -1; if (ids->in_use == IPCMNI) return IPCMNI - 1; /* Look for the last assigned id */ total = 0; for (id = 0; id < IPCMNI && total < ids->in_use; id++) { ipc = idr_find(&ids->ipcs_idr, id); if (ipc != NULL) { max_id = id; total++; } } return max_id; }


Nadia Derbey5955.14%125.00%
Linus Torvalds (pre-git)4138.32%125.00%
Paul E. McKenney65.61%125.00%
Andrew Morton10.93%125.00%

/** * ipc_addid - add an ipc identifier * @ids: ipc identifier set * @new: new ipc permission set * @size: limit for the number of used ids * * Add an entry 'new' to the ipc ids idr. The permissions object is * initialised and the first free entry is set up and the id assigned * is returned. The 'new' entry is returned in a locked state on success. * On failure the entry is not locked and a negative err-code is returned. * * Called with writer ipc_ids.rwsem held. */
int ipc_addid(struct ipc_ids *ids, struct kern_ipc_perm *new, int size) { kuid_t euid; kgid_t egid; int id; int next_id = ids->next_id; if (size > IPCMNI) size = IPCMNI; if (ids->in_use >= size) return -ENOSPC; idr_preload(GFP_KERNEL); spin_lock_init(&new->lock); new->deleted = false; rcu_read_lock(); spin_lock(&new->lock); current_euid_egid(&euid, &egid); new->cuid = new->uid = euid; new->gid = new->cgid = egid; id = idr_alloc(&ids->ipcs_idr, new, (next_id < 0) ? 0 : ipcid_to_idx(next_id), 0, GFP_NOWAIT); idr_preload_end(); if (id < 0) { spin_unlock(&new->lock); rcu_read_unlock(); return id; } ids->in_use++; if (next_id < 0) { new->seq = ids->seq++; if (ids->seq > IPCID_SEQ_MAX) ids->seq = 0; } else { new->seq = ipcid_to_seqx(next_id); ids->next_id = -1; } new->id = ipc_buildid(id, new->seq); return id; }


Linus Torvalds (pre-git)6627.50%321.43%
Nadia Derbey5924.58%214.29%
Stanislav Kinsbursky4719.58%17.14%
Linus Torvalds2912.08%17.14%
Tejun Heo177.08%17.14%
Pierre Peiffer145.83%214.29%
David Howells41.67%17.14%
Eric W. Biedermann20.83%17.14%
Rafael Aquini10.42%17.14%
Davidlohr Bueso A10.42%17.14%

/** * ipcget_new - create a new ipc object * @ns: ipc namespace * @ids: ipc identifier set * @ops: the actual creation routine to call * @params: its parameters * * This routine is called by sys_msgget, sys_semget() and sys_shmget() * when the key is IPC_PRIVATE. */
static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids, const struct ipc_ops *ops, struct ipc_params *params) { int err; down_write(&ids->rwsem); err = ops->getnew(ns, params); up_write(&ids->rwsem); return err; }


Nadia Derbey5693.33%240.00%
Davidlohr Bueso A23.33%120.00%
Mathias Krause11.67%120.00%
Pavel Emelyanov11.67%120.00%

/** * ipc_check_perms - check security and permissions for an ipc object * @ns: ipc namespace * @ipcp: ipc permission set * @ops: the actual security routine to call * @params: its parameters * * This routine is called by sys_msgget(), sys_semget() and sys_shmget() * when the key is not IPC_PRIVATE and that key already exists in the * ds IDR. * * On success, the ipc id is returned. * * It is called with ipc_ids.rwsem and ipcp->lock held. */
static int ipc_check_perms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, const struct ipc_ops *ops, struct ipc_params *params) { int err; if (ipcperms(ns, ipcp, params->flg)) err = -EACCES; else { err = ops->associate(ipcp, params->flg); if (!err) err = ipcp->id; } return err; }


Nadia Derbey7089.74%133.33%
Serge E. Hallyn78.97%133.33%
Mathias Krause11.28%133.33%

/** * ipcget_public - get an ipc object or create a new one * @ns: ipc namespace * @ids: ipc identifier set * @ops: the actual creation routine to call * @params: its parameters * * This routine is called by sys_msgget, sys_semget() and sys_shmget() * when the key is not IPC_PRIVATE. * It adds a new entry if the key is not found and does some permission * / security checkings if the key is found. * * On success, the ipc id is returned. */
static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids, const struct ipc_ops *ops, struct ipc_params *params) { struct kern_ipc_perm *ipcp; int flg = params->flg; int err; /* * Take the lock as a writer since we are potentially going to add * a new entry + read locks are not "upgradable" */ down_write(&ids->rwsem); ipcp = ipc_findkey(ids, params->key); if (ipcp == NULL) { /* key not used */ if (!(flg & IPC_CREAT)) err = -ENOENT; else err = ops->getnew(ns, params); } else { /* ipc object has been locked by ipc_findkey() */ if (flg & IPC_CREAT && flg & IPC_EXCL) err = -EEXIST; else { err = 0; if (ops->more_checks) err = ops->more_checks(ipcp, params); if (!err) /* * ipc_check_perms returns the IPC id on * success */ err = ipc_check_perms(ns, ipcp, ops, params); } ipc_unlock(ipcp); } up_write(&ids->rwsem); return err; }


Nadia Derbey16996.57%342.86%
Davidlohr Bueso A21.14%114.29%
Serge E. Hallyn21.14%114.29%
Mathias Krause10.57%114.29%
Pavel Emelyanov10.57%114.29%

/** * ipc_rmid - remove an ipc identifier * @ids: ipc identifier set * @ipcp: ipc perm structure containing the identifier to remove * * ipc_ids.rwsem (as a writer) and the spinlock for this ID are held * before this function is called, and remain locked on the exit. */
void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp) { int lid = ipcid_to_idx(ipcp->id); idr_remove(&ids->ipcs_idr, lid); ids->in_use--; ipcp->deleted = true; }


Linus Torvalds (pre-git)2554.35%228.57%
Nadia Derbey1430.43%228.57%
Andrew Morton48.70%114.29%
Eric Sesterhenn / Snakebyte24.35%114.29%
Rafael Aquini12.17%114.29%

/** * ipc_alloc - allocate ipc space * @size: size desired * * Allocate memory from the appropriate pools and return a pointer to it. * NULL is returned if the allocation fails */
void *ipc_alloc(int size) { void *out; if (size > PAGE_SIZE) out = vmalloc(size); else out = kmalloc(size, GFP_KERNEL); return out; }


Linus Torvalds (pre-git)39100.00%3100.00%

/** * ipc_free - free ipc space * @ptr: pointer returned by ipc_alloc * * Free a block created with ipc_alloc(). */
void ipc_free(void *ptr) { kvfree(ptr); }


Linus Torvalds (pre-git)1392.86%150.00%
Tetsuo Handa17.14%150.00%

/** * ipc_rcu_alloc - allocate ipc and rcu space * @size: size desired * * Allocate memory for the rcu header structure + the object. * Returns the pointer to the object or NULL upon failure. */
void *ipc_rcu_alloc(int size) { /* * We prepend the allocation with the rcu struct */ struct ipc_rcu *out = ipc_alloc(sizeof(struct ipc_rcu) + size); if (unlikely(!out)) return NULL; atomic_set(&out->refcount, 1); return out + 1; }


Andrew Morton2140.38%120.00%
Al Viro1426.92%120.00%
Manfred Spraul1223.08%240.00%
Rik Van Riel59.62%120.00%

int ipc_rcu_getref(void *ptr) { struct ipc_rcu *p = ((struct ipc_rcu *)ptr) - 1; return atomic_inc_not_zero(&p->refcount); }


Manfred Spraul2779.41%266.67%
Rik Van Riel720.59%133.33%

void ipc_rcu_putref(void *ptr, void (*func)(struct rcu_head *head)) { struct ipc_rcu *p = ((struct ipc_rcu *)ptr) - 1; if (!atomic_dec_and_test(&p->refcount)) return; call_rcu(&p->rcu, func); }


Andrew Morton1728.81%116.67%
Al Viro1525.42%116.67%
Davidlohr Bueso A1322.03%116.67%
Manfred Spraul1322.03%233.33%
Rik Van Riel11.69%116.67%

void ipc_rcu_free(struct rcu_head *head) { struct ipc_rcu *p = container_of(head, struct ipc_rcu, rcu); kvfree(p); }


Davidlohr Bueso A2273.33%120.00%
Andrew Morton516.67%120.00%
Pekka J Enberg13.33%120.00%
Al Viro13.33%120.00%
Lai Jiangshan13.33%120.00%

/** * ipcperms - check ipc permissions * @ns: ipc namespace * @ipcp: ipc permission set * @flag: desired permission set * * Check user, group, other permissions for access * to ipc resources. return 0 if allowed * * @flag will most probably be 0 or S_...UGO from <linux/stat.h> */
int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flag) { kuid_t euid = current_euid(); int requested_mode, granted_mode; audit_ipc_obj(ipcp); requested_mode = (flag >> 6) | (flag >> 3) | flag; granted_mode = ipcp->mode; if (uid_eq(euid, ipcp->cuid) || uid_eq(euid, ipcp->uid)) granted_mode >>= 6; else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid)) granted_mode >>= 3; /* is there some bit set in requested_mode but not in granted_mode? */ if ((requested_mode & ~granted_mode & 0007) && !ns_capable(ns->user_ns, CAP_IPC_OWNER)) return -1; return security_ipc_permission(ipcp, flag); }


Linus Torvalds (pre-git)10074.07%646.15%
Serge E. Hallyn107.41%17.69%
Eric W. Biedermann96.67%17.69%
Stephen D. Smalley53.70%17.69%
David Howells53.70%17.69%
Steve Grubb42.96%17.69%
Greg Kroah-Hartman10.74%17.69%
Al Viro10.74%17.69%

/* * Functions to convert between the kern_ipc_perm structure and the * old/new ipc_perm structures */ /** * kernel_to_ipc64_perm - convert kernel ipc permissions to user * @in: kernel permissions * @out: new style ipc permissions * * Turn the kernel object @in into a set of permissions descriptions * for returning to userspace (@out). */
void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out) { out->key = in->key; out->uid = from_kuid_munged(current_user_ns(), in->uid); out->gid = from_kgid_munged(current_user_ns(), in->gid); out->cuid = from_kuid_munged(current_user_ns(), in->cuid); out->cgid = from_kgid_munged(current_user_ns(), in->cgid); out->mode = in->mode; out->seq = in->seq; }


Linus Torvalds (pre-git)7174.74%150.00%
Eric W. Biedermann2425.26%150.00%

/** * ipc64_perm_to_ipc_perm - convert new ipc permissions to old * @in: new style ipc permissions * @out: old style ipc permissions * * Turn the new style permissions object @in into a compatibility * object and store it into the @out pointer. */
void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out) { out->key = in->key; SET_UID(out->uid, in->uid); SET_GID(out->gid, in->gid); SET_UID(out->cuid, in->cuid); SET_GID(out->cgid, in->cgid); out->mode = in->mode; out->seq = in->seq; }


Linus Torvalds (pre-git)7185.54%150.00%
Andi Kleen1214.46%150.00%

/** * ipc_obtain_object * @ids: ipc identifier set * @id: ipc id to look for * * Look for an id in the ipc ids idr and return associated ipc object. * * Call inside the RCU critical section. * The ipc object is *not* locked on exit. */
struct kern_ipc_perm *ipc_obtain_object_idr(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out; int lid = ipcid_to_idx(id); out = idr_find(&ids->ipcs_idr, lid); if (!out) return ERR_PTR(-EINVAL); return out; }


Andrew Morton3461.82%225.00%
Nadia Derbey1527.27%337.50%
Davidlohr Bueso A59.09%225.00%
Paul E. McKenney11.82%112.50%

/** * ipc_lock - lock an ipc structure without rwsem held * @ids: ipc identifier set * @id: ipc id to look for * * Look for an id in the ipc ids idr and lock the associated ipc object. * * The ipc object is locked on successful exit. */
struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out; rcu_read_lock(); out = ipc_obtain_object_idr(ids, id); if (IS_ERR(out)) goto err; spin_lock(&out->lock); /* * ipc_rmid() may have already freed the ID while ipc_lock() * was spinning: here verify that the structure is still valid. * Upon races with RMID, return -EIDRM, thus indicating that * the ID points to a removed identifier. */ if (ipc_valid_object(out)) return out; spin_unlock(&out->lock); out = ERR_PTR(-EIDRM); err: rcu_read_unlock(); return out; }


Davidlohr Bueso A5868.24%360.00%
Andrew Morton2428.24%120.00%
Rafael Aquini33.53%120.00%

/** * ipc_obtain_object_check * @ids: ipc identifier set * @id: ipc id to look for * * Similar to ipc_obtain_object_idr() but also checks * the ipc object reference counter. * * Call inside the RCU critical section. * The ipc object is *not* locked on exit. */
struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out = ipc_obtain_object_idr(ids, id); if (IS_ERR(out)) goto out; if (ipc_checkid(out, id)) return ERR_PTR(-EINVAL); out: return out; }


Davidlohr Bueso A4984.48%360.00%
Andrew Morton58.62%120.00%
Nadia Derbey46.90%120.00%

/** * ipcget - Common sys_*get() code * @ns: namespace * @ids: ipc identifier set * @ops: operations to be called on ipc object creation, permission checks * and further checks * @params: the parameters needed by the previous operations. * * Common routine called by sys_msgget(), sys_semget() and sys_shmget(). */
int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, const struct ipc_ops *ops, struct ipc_params *params) { if (params->key == IPC_PRIVATE) return ipcget_new(ns, ids, ops, params); else return ipcget_public(ns, ids, ops, params); }


Pavel Emelyanov5898.31%150.00%
Mathias Krause11.69%150.00%

/** * ipc_update_perm - update the permissions of an ipc object * @in: the permission given as input. * @out: the permission of the ipc to set. */
int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out) { kuid_t uid = make_kuid(current_user_ns(), in->uid); kgid_t gid = make_kgid(current_user_ns(), in->gid); if (!uid_valid(uid) || !gid_valid(gid)) return -EINVAL; out->uid = uid; out->gid = gid; out->mode = (out->mode & ~S_IRWXUGO) | (in->mode & S_IRWXUGO); return 0; }


Eric W. Biedermann4850.53%150.00%
Pierre Peiffer4749.47%150.00%

/** * ipcctl_pre_down_nolock - retrieve an ipc and check permissions for some IPC_XXX cmd * @ns: ipc namespace * @ids: the table of ids where to look for the ipc * @id: the id of the ipc to retrieve * @cmd: the cmd to check * @perm: the permission to set * @extra_perm: one extra permission parameter used by msq * * This function does some common audit and permissions check for some IPC_XXX * cmd and is called from semctl_down, shmctl_down and msgctl_down. * It must be called without any lock held and * - retrieves the ipc with the given id in the given table. * - performs some audit and permission check, depending on the given cmd * - returns a pointer to the ipc object or otherwise, the corresponding error. * * Call holding the both the rwsem and the rcu read lock. */
struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns, struct ipc_ids *ids, int id, int cmd, struct ipc64_perm *perm, int extra_perm) { kuid_t euid; int err = -EPERM; struct kern_ipc_perm *ipcp; ipcp = ipc_obtain_object_check(ids, id); if (IS_ERR(ipcp)) { err = PTR_ERR(ipcp); goto err; } audit_ipc_obj(ipcp); if (cmd == IPC_SET) audit_ipc_set_perm(extra_perm, perm->uid, perm->gid, perm->mode); euid = current_euid(); if (uid_eq(euid, ipcp->cuid) || uid_eq(euid, ipcp->uid) || ns_capable(ns->user_ns, CAP_SYS_ADMIN)) return ipcp; /* successful lookup */ err: return ERR_PTR(err); }


Pierre Peiffer8457.14%116.67%
Davidlohr Bueso A4228.57%233.33%
Eric W. Biedermann96.12%116.67%
David Howells74.76%116.67%
Serge E. Hallyn53.40%116.67%

#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION /** * ipc_parse_version - ipc call version * @cmd: pointer to command * * Return IPC_64 for new style IPC and IPC_OLD for old style IPC. * The @cmd value is turned from an encoding command and version into * just the command code. */
int ipc_parse_version(int *cmd) { if (*cmd & IPC_64) { *cmd ^= IPC_64; return IPC_64; } else { return IPC_OLD; } }


Linus Torvalds (pre-git)32100.00%1100.00%

#endif /* CONFIG_ARCH_WANT_IPC_PARSE_VERSION */ #ifdef CONFIG_PROC_FS struct ipc_proc_iter { struct ipc_namespace *ns; struct ipc_proc_iface *iface; }; /* * This routine locks the ipc structure found at least at position pos. */
static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t pos, loff_t *new_pos) { struct kern_ipc_perm *ipc; int total, id; total = 0; for (id = 0; id < pos && total < ids->in_use; id++) { ipc = idr_find(&ids->ipcs_idr, id); if (ipc != NULL) total++; } if (total >= ids->in_use) return NULL; for (; pos < IPCMNI; pos++) { ipc = idr_find(&ids->ipcs_idr, pos); if (ipc != NULL) { *new_pos = pos + 1; rcu_read_lock(); ipc_lock_object(ipc); return ipc; } } /* Out of range - return NULL to terminate iteration */ return NULL; }


Nadia Derbey13696.45%133.33%
Davidlohr Bueso A42.84%133.33%
Adrian Bunk10.71%133.33%

static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos) { struct ipc_proc_iter *iter = s->private; struct ipc_proc_iface *iface = iter->iface; struct kern_ipc_perm *ipc = it; /* If we had an ipc id locked before, unlock it */ if (ipc && ipc != SEQ_START_TOKEN) ipc_unlock(ipc); return sysvipc_find_ipc(&iter->ns->ids[iface->ids], *pos, pos); }


Mike Waychison5568.75%125.00%
Nadia Derbey1316.25%125.00%
Eric W. Biedermann1113.75%125.00%
Pierre Peiffer11.25%125.00%

/* * File positions: pos 0 -> header, pos n -> ipc id = n - 1. * SeqFile iterator: iterator value locked ipc pointer or SEQ_TOKEN_START. */
static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos) { struct ipc_proc_iter *iter = s->private; struct ipc_proc_iface *iface = iter->iface; struct ipc_ids *ids; ids = &iter->ns->ids[iface->ids]; /* * Take the lock - this will be released by the corresponding * call to stop(). */ down_read(&ids->rwsem); /* pos < 0 is invalid */ if (*pos < 0) return NULL; /* pos == 0 means header */ if (*pos == 0) return SEQ_START_TOKEN; /* Find the (pos-1)th ipc */ return sysvipc_find_ipc(ids, *pos - 1, pos); }


Mike Waychison6162.24%114.29%
Kirill Korotaev1515.31%114.29%
Eric W. Biedermann1313.27%114.29%
Nadia Derbey77.14%228.57%
Pierre Peiffer11.02%114.29%
Davidlohr Bueso A11.02%114.29%

static void sysvipc_proc_stop(struct seq_file *s, void *it) { struct kern_ipc_perm *ipc = it; struct ipc_proc_iter *iter = s->private; struct ipc_proc_iface *iface = iter->iface; struct ipc_ids *ids; /* If we had a locked structure, release it */ if (ipc && ipc != SEQ_START_TOKEN) ipc_unlock(ipc); ids = &iter->ns->ids[iface->ids]; /* Release the lock we took in start() */ up_read(&ids->rwsem); }


Mike Waychison4959.76%114.29%
Kirill Korotaev1619.51%114.29%
Eric W. Biedermann1315.85%114.29%
Nadia Derbey22.44%228.57%
Davidlohr Bueso A11.22%114.29%
Pierre Peiffer11.22%114.29%

static int sysvipc_proc_show(struct seq_file *s, void *it) { struct ipc_proc_iter *iter = s->private; struct ipc_proc_iface *iface = iter->iface; if (it == SEQ_START_TOKEN) { seq_puts(s, iface->header); return 0; } return iface->show(s, it); }


Mike Waychison4774.60%133.33%
Eric W. Biedermann1117.46%133.33%
Joe Perches57.94%133.33%

static const struct seq_operations sysvipc_proc_seqops = { .start = sysvipc_proc_start, .stop = sysvipc_proc_stop, .next = sysvipc_proc_next, .show = sysvipc_proc_show, };
static int sysvipc_proc_open(struct inode *inode, struct file *file) { struct ipc_proc_iter *iter; iter = __seq_open_private(file, &sysvipc_proc_seqops, sizeof(*iter)); if (!iter) return -ENOMEM; iter->iface = PDE_DATA(inode); iter->ns = get_ipc_ns(current->nsproxy->ipc_ns); return 0; }


Eric W. Biedermann3853.52%125.00%
Mike Waychison2129.58%125.00%
Rob Jones1115.49%125.00%
Al Viro11.41%125.00%

static int sysvipc_proc_release(struct inode *inode, struct file *file) { struct seq_file *seq = file->private_data; struct ipc_proc_iter *iter = seq->private; put_ipc_ns(iter->ns); return seq_release_private(inode, file); }


Eric W. Biedermann4897.96%150.00%
Mike Waychison12.04%150.00%

static const struct file_operations sysvipc_proc_fops = { .open = sysvipc_proc_open, .read = seq_read, .llseek = seq_lseek, .release = sysvipc_proc_release, }; #endif /* CONFIG_PROC_FS */

Overall Contributors

Nadia Derbey65923.06%89.52%
Linus Torvalds (pre-git)57220.01%1315.48%
Mike Waychison44615.61%11.19%
Eric W. Biedermann2428.47%22.38%
Davidlohr Bueso A2298.01%1315.48%
Pierre Peiffer1485.18%55.95%
Andrew Morton1364.76%67.14%
Pavel Emelyanov632.20%22.38%
Stanislav Kinsbursky541.89%11.19%
Manfred Spraul521.82%22.38%
Kirill Korotaev361.26%11.19%
Al Viro321.12%33.57%
Linus Torvalds301.05%22.38%
Serge E. Hallyn240.84%11.19%
Tejun Heo170.59%11.19%
David Howells160.56%11.19%
Rik Van Riel130.45%11.19%
Andi Kleen120.42%11.19%
Rob Jones110.38%11.19%
Paul E. McKenney100.35%11.19%
Stephen D. Smalley80.28%11.19%
Denis V. Lunev70.24%11.19%
Steve Grubb70.24%11.19%
Rafael Aquini50.17%11.19%
Joe Perches50.17%11.19%
Mathias Krause40.14%11.19%
Masanari Iida30.10%11.19%
Randy Dunlap30.10%11.19%
Will Deacon20.07%11.19%
Arjan van de Ven20.07%11.19%
Tetsuo Handa20.07%11.19%
Eric Sesterhenn / Snakebyte20.07%11.19%
Pekka J Enberg10.03%11.19%
Lai Jiangshan10.03%11.19%
Paul McQuade10.03%11.19%
James Morris10.03%11.19%
Greg Kroah-Hartman10.03%11.19%
Adrian Bunk10.03%11.19%
Directory: ipc
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.