cregit-Linux how code gets into the kernel

Release 4.11 ipc/compat.c

Directory: ipc
/*
 * 32 bit compatibility code for System V IPC
 *
 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 2000           VA Linux Co
 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
 * Copyright (C) 2000           Hewlett-Packard Co.
 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 2000           Gerhard Tonn (ton@de.ibm.com)
 * Copyright (C) 2000-2002      Andi Kleen, SuSE Labs (x86-64 port)
 * Copyright (C) 2000           Silicon Graphics, Inc.
 * Copyright (C) 2001           IBM
 * Copyright (C) 2004           IBM Deutschland Entwicklung GmbH, IBM Corporation
 * Copyright (C) 2004           Arnd Bergmann (arnd@arndb.de)
 *
 * This code is collected from the versions for sparc64, mips64, s390x, ia64,
 * ppc64 and x86_64, all of which are based on the original sparc64 version
 * by Jakub Jelinek.
 *
 */
#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/highuid.h>
#include <linux/init.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/syscalls.h>
#include <linux/ptrace.h>

#include <linux/mutex.h>
#include <linux/uaccess.h>

#include "util.h"


struct compat_msgbuf {
	
compat_long_t mtype;
	
char mtext[1];
};


struct compat_ipc_perm {
	
key_t key;
	
__compat_uid_t uid;
	
__compat_gid_t gid;
	
__compat_uid_t cuid;
	
__compat_gid_t cgid;
	
compat_mode_t mode;
	
unsigned short seq;
};


struct compat_semid_ds {
	
struct compat_ipc_perm sem_perm;
	
compat_time_t sem_otime;
	
compat_time_t sem_ctime;
	
compat_uptr_t sem_base;
	
compat_uptr_t sem_pending;
	
compat_uptr_t sem_pending_last;
	
compat_uptr_t undo;
	
unsigned short sem_nsems;
};


struct compat_msqid_ds {
	
struct compat_ipc_perm msg_perm;
	
compat_uptr_t msg_first;
	
compat_uptr_t msg_last;
	
compat_time_t msg_stime;
	
compat_time_t msg_rtime;
	
compat_time_t msg_ctime;
	
compat_ulong_t msg_lcbytes;
	
compat_ulong_t msg_lqbytes;
	
unsigned short msg_cbytes;
	
unsigned short msg_qnum;
	
unsigned short msg_qbytes;
	
compat_ipc_pid_t msg_lspid;
	
compat_ipc_pid_t msg_lrpid;
};


struct compat_shmid_ds {
	
struct compat_ipc_perm shm_perm;
	
int shm_segsz;
	
compat_time_t shm_atime;
	
compat_time_t shm_dtime;
	
compat_time_t shm_ctime;
	
compat_ipc_pid_t shm_cpid;
	
compat_ipc_pid_t shm_lpid;
	
unsigned short shm_nattch;
	
unsigned short shm_unused;
	
compat_uptr_t shm_unused2;
	
compat_uptr_t shm_unused3;
};


struct compat_ipc_kludge {
	
compat_uptr_t msgp;
	
compat_long_t msgtyp;
};


struct compat_shminfo64 {
	
compat_ulong_t shmmax;
	
compat_ulong_t shmmin;
	
compat_ulong_t shmmni;
	
compat_ulong_t shmseg;
	
compat_ulong_t shmall;
	
compat_ulong_t __unused1;
	
compat_ulong_t __unused2;
	
compat_ulong_t __unused3;
	
compat_ulong_t __unused4;
};


struct compat_shm_info {
	
compat_int_t used_ids;
	


compat_ulong_t shm_tot, shm_rss, shm_swp;
	

compat_ulong_t swap_attempts, swap_successes;
};


static inline int compat_ipc_parse_version(int *cmd) { #ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION int version = *cmd & IPC_64; /* this is tricky: architectures that have support for the old * ipc structures in 64 bit binaries need to have IPC_64 set * in cmd, the others need to have it cleared */ #ifndef ipc_parse_version *cmd |= IPC_64; #else *cmd &= ~IPC_64; #endif return version; #else /* With the asm-generic APIs, we always use the 64-bit versions. */ return IPC_64; #endif }

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static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64, struct compat_ipc64_perm __user *up64) { int err; err = __get_user(p64->uid, &up64->uid); err |= __get_user(p64->gid, &up64->gid); err |= __get_user(p64->mode, &up64->mode); return err; }

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static inline int __get_compat_ipc_perm(struct ipc64_perm *p, struct compat_ipc_perm __user *up) { int err; err = __get_user(p->uid, &up->uid); err |= __get_user(p->gid, &up->gid); err |= __get_user(p->mode, &up->mode); return err; }

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static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64, struct compat_ipc64_perm __user *up64) { int err; err = __put_user(p64->key, &up64->key); err |= __put_user(p64->uid, &up64->uid); err |= __put_user(p64->gid, &up64->gid); err |= __put_user(p64->cuid, &up64->cuid); err |= __put_user(p64->cgid, &up64->cgid); err |= __put_user(p64->mode, &up64->mode); err |= __put_user(p64->seq, &up64->seq); return err; }

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static inline int __put_compat_ipc_perm(struct ipc64_perm *p, struct compat_ipc_perm __user *uip) { int err; __compat_uid_t u; __compat_gid_t g; err = __put_user(p->key, &uip->key); SET_UID(u, p->uid); err |= __put_user(u, &uip->uid); SET_GID(g, p->gid); err |= __put_user(g, &uip->gid); SET_UID(u, p->cuid); err |= __put_user(u, &uip->cuid); SET_GID(g, p->cgid); err |= __put_user(g, &uip->cgid); err |= __put_user(p->mode, &uip->mode); err |= __put_user(p->seq, &uip->seq); return err; }

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static inline int get_compat_semid64_ds(struct semid64_ds *sem64, struct compat_semid64_ds __user *up64) { if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) return -EFAULT; return __get_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm); }

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static inline int get_compat_semid_ds(struct semid64_ds *s, struct compat_semid_ds __user *up) { if (!access_ok(VERIFY_READ, up, sizeof(*up))) return -EFAULT; return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm); }

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static inline int put_compat_semid64_ds(struct semid64_ds *sem64, struct compat_semid64_ds __user *up64) { int err; if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) return -EFAULT; err = __put_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm); err |= __put_user(sem64->sem_otime, &up64->sem_otime); err |= __put_user(sem64->sem_ctime, &up64->sem_ctime); err |= __put_user(sem64->sem_nsems, &up64->sem_nsems); return err; }

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static inline int put_compat_semid_ds(struct semid64_ds *s, struct compat_semid_ds __user *up) { int err; if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) return -EFAULT; err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm); err |= __put_user(s->sem_otime, &up->sem_otime); err |= __put_user(s->sem_ctime, &up->sem_ctime); err |= __put_user(s->sem_nsems, &up->sem_nsems); return err; }

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static long do_compat_semctl(int first, int second, int third, u32 pad) { unsigned long fourth; int err, err2; struct semid64_ds sem64; struct semid64_ds __user *up64; int version = compat_ipc_parse_version(&third); memset(&sem64, 0, sizeof(sem64)); if ((third & (~IPC_64)) == SETVAL) #ifdef __BIG_ENDIAN fourth = (unsigned long)pad << 32; #else fourth = pad; #endif else fourth = (unsigned long)compat_ptr(pad); switch (third & (~IPC_64)) { case IPC_INFO: case IPC_RMID: case SEM_INFO: case GETVAL: case GETPID: case GETNCNT: case GETZCNT: case GETALL: case SETVAL: case SETALL: err = sys_semctl(first, second, third, fourth); break; case IPC_STAT: case SEM_STAT: up64 = compat_alloc_user_space(sizeof(sem64)); fourth = (unsigned long)up64; err = sys_semctl(first, second, third, fourth); if (err < 0) break; if (copy_from_user(&sem64, up64, sizeof(sem64))) err2 = -EFAULT; else if (version == IPC_64) err2 = put_compat_semid64_ds(&sem64, compat_ptr(pad)); else err2 = put_compat_semid_ds(&sem64, compat_ptr(pad)); if (err2) err = -EFAULT; break; case IPC_SET: if (version == IPC_64) err = get_compat_semid64_ds(&sem64, compat_ptr(pad)); else err = get_compat_semid_ds(&sem64, compat_ptr(pad)); up64 = compat_alloc_user_space(sizeof(sem64)); if (copy_to_user(up64, &sem64, sizeof(sem64))) err = -EFAULT; if (err) break; fourth = (unsigned long)up64; err = sys_semctl(first, second, third, fourth); break; default: err = -EINVAL; break; } return err; }

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Chris Metcalf41.08%116.67%
Total371100.00%6100.00%


static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) { struct compat_msgbuf __user *msgp = dest; size_t msgsz; if (put_user(msg->m_type, &msgp->mtype)) return -EFAULT; msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; if (store_msg(msgp->mtext, msg, msgsz)) return -EFAULT; return msgsz; }

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#ifndef COMPAT_SHMLBA #define COMPAT_SHMLBA SHMLBA #endif #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second, u32, third, compat_uptr_t, ptr, u32, fifth) { int version; u32 pad; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; switch (call) { case SEMOP: /* struct sembuf is the same on 32 and 64bit :)) */ return sys_semtimedop(first, compat_ptr(ptr), second, NULL); case SEMTIMEDOP: return compat_sys_semtimedop(first, compat_ptr(ptr), second, compat_ptr(fifth)); case SEMGET: return sys_semget(first, second, third); case SEMCTL: if (!ptr) return -EINVAL; if (get_user(pad, (u32 __user *) compat_ptr(ptr))) return -EFAULT; return do_compat_semctl(first, second, third, pad); case MSGSND: { struct compat_msgbuf __user *up = compat_ptr(ptr); compat_long_t type; if (first < 0 || second < 0) return -EINVAL; if (get_user(type, &up->mtype)) return -EFAULT; return do_msgsnd(first, type, up->mtext, second, third); } case MSGRCV: { void __user *uptr = compat_ptr(ptr); if (first < 0 || second < 0) return -EINVAL; if (!version) { struct compat_ipc_kludge ipck; if (!uptr) return -EINVAL; if (copy_from_user(&ipck, uptr, sizeof(ipck))) return -EFAULT; uptr = compat_ptr(ipck.msgp); fifth = ipck.msgtyp; } return do_msgrcv(first, uptr, second, (s32)fifth, third, compat_do_msg_fill); } case MSGGET: return sys_msgget(first, second); case MSGCTL: return compat_sys_msgctl(first, second, compat_ptr(ptr)); case SHMAT: { int err; unsigned long raddr; if (version == 1) return -EINVAL; err = do_shmat(first, compat_ptr(ptr), second, &raddr, COMPAT_SHMLBA); if (err < 0) return err; return put_user(raddr, (compat_ulong_t *)compat_ptr(third)); } case SHMDT: return sys_shmdt(compat_ptr(ptr)); case SHMGET: return sys_shmget(first, (unsigned)second, third); case SHMCTL: return compat_sys_shmctl(first, second, compat_ptr(ptr)); } return -ENOSYS; } #endif COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg) { return do_compat_semctl(semid, semnum, cmd, arg); } COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp, compat_ssize_t, msgsz, int, msgflg) { struct compat_msgbuf __user *up = compat_ptr(msgp); compat_long_t mtype; if (get_user(mtype, &up->mtype)) return -EFAULT; return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg); } COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp, compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg) { return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp, msgflg, compat_do_msg_fill); }
static inline int get_compat_msqid64(struct msqid64_ds *m64, struct compat_msqid64_ds __user *up64) { int err; if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) return -EFAULT; err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm); err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes); return err; }

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static inline int get_compat_msqid(struct msqid64_ds *m, struct compat_msqid_ds __user *up) { int err; if (!access_ok(VERIFY_READ, up, sizeof(*up))) return -EFAULT; err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm); err |= __get_user(m->msg_qbytes, &up->msg_qbytes); return err; }

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static inline int put_compat_msqid64_ds(struct msqid64_ds *m64, struct compat_msqid64_ds __user *up64) { int err; if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) return -EFAULT; err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm); err |= __put_user(m64->msg_stime, &up64->msg_stime); err |= __put_user(m64->msg_rtime, &up64->msg_rtime); err |= __put_user(m64->msg_ctime, &up64->msg_ctime); err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes); err |= __put_user(m64->msg_qnum, &up64->msg_qnum); err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes); err |= __put_user(m64->msg_lspid, &up64->msg_lspid); err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid); return err; }

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static inline int put_compat_msqid_ds(struct msqid64_ds *m, struct compat_msqid_ds __user *up) { int err; if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) return -EFAULT; err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm); err |= __put_user(m->msg_stime, &up->msg_stime); err |= __put_user(m->msg_rtime, &up->msg_rtime); err |= __put_user(m->msg_ctime, &up->msg_ctime); err |= __put_user(m->msg_cbytes, &up->msg_cbytes); err |= __put_user(m->msg_qnum, &up->msg_qnum); err |= __put_user(m->msg_qbytes, &up->msg_qbytes); err |= __put_user(m->msg_lspid, &up->msg_lspid); err |= __put_user(m->msg_lrpid, &up->msg_lrpid); return err; }

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COMPAT_SYSCALL_DEFINE3(msgctl, int, first, int, second, void __user *, uptr) { int err, err2; struct msqid64_ds m64; int version = compat_ipc_parse_version(&second); void __user *p; memset(&m64, 0, sizeof(m64)); switch (second & (~IPC_64)) { case IPC_INFO: case IPC_RMID: case MSG_INFO: err = sys_msgctl(first, second, uptr); break; case IPC_SET: if (version == IPC_64) err = get_compat_msqid64(&m64, uptr); else err = get_compat_msqid(&m64, uptr); if (err) break; p = compat_alloc_user_space(sizeof(m64)); if (copy_to_user(p, &m64, sizeof(m64))) err = -EFAULT; else err = sys_msgctl(first, second, p); break; case IPC_STAT: case MSG_STAT: p = compat_alloc_user_space(sizeof(m64)); err = sys_msgctl(first, second, p); if (err < 0) break; if (copy_from_user(&m64, p, sizeof(m64))) err2 = -EFAULT; else if (version == IPC_64) err2 = put_compat_msqid64_ds(&m64, uptr); else err2 = put_compat_msqid_ds(&m64, uptr); if (err2) err = -EFAULT; break; default: err = -EINVAL; break; } return err; } COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg) { unsigned long ret; long err; err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA); if (err) return err; force_successful_syscall_return(); return (long)ret; }
static inline int get_compat_shmid64_ds(struct shmid64_ds *sem64,