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ipc/compat.c
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/* * 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> |
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#include <linux/errno.h> #include <linux/highuid.h> #include <linux/init.h> #include <linux/msg.h> #include <linux/shm.h> |
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#include <linux/syscalls.h> |
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#include <linux/ptrace.h> |
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#include <linux/mutex.h> |
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#include <asm/uaccess.h> #include "util.h" struct compat_msgbuf { compat_long_t mtype; char mtext[1]; }; struct compat_ipc_perm { key_t key; |
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__compat_uid_t uid; __compat_gid_t gid; __compat_uid_t cuid; __compat_gid_t cgid; |
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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; }; extern int sem_ctls[]; #define sc_semopm (sem_ctls[2]) |
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static inline int compat_ipc_parse_version(int *cmd) { |
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#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION |
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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; |
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#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; } 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; } 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; } static inline int __put_compat_ipc_perm(struct ipc64_perm *p, struct compat_ipc_perm __user *up) { int err; |
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__compat_uid_t u; __compat_gid_t g; |
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err = __put_user(p->key, &up->key); SET_UID(u, p->uid); err |= __put_user(u, &up->uid); SET_GID(g, p->gid); err |= __put_user(g, &up->gid); SET_UID(u, p->cuid); err |= __put_user(u, &up->cuid); SET_GID(g, p->cgid); err |= __put_user(g, &up->cgid); err |= __put_user(p->mode, &up->mode); err |= __put_user(p->seq, &up->seq); return err; } static inline int get_compat_semid64_ds(struct semid64_ds *s64, struct compat_semid64_ds __user *up64) { if (!access_ok (VERIFY_READ, up64, sizeof(*up64))) return -EFAULT; return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm); } 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); } static inline int put_compat_semid64_ds(struct semid64_ds *s64, struct compat_semid64_ds __user *up64) { int err; if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64))) return -EFAULT; err = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm); err |= __put_user(s64->sem_otime, &up64->sem_otime); err |= __put_user(s64->sem_ctime, &up64->sem_ctime); err |= __put_user(s64->sem_nsems, &up64->sem_nsems); return err; } 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))) |
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return -EFAULT; |
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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) |
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{ |
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unsigned long fourth; |
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int err, err2; struct semid64_ds s64; struct semid64_ds __user *up64; int version = compat_ipc_parse_version(&third); |
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memset(&s64, 0, sizeof(s64)); |
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if ((third & (~IPC_64)) == SETVAL) |
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#ifdef __BIG_ENDIAN fourth = (unsigned long)pad << 32; #else fourth = pad; #endif |
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else |
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fourth = (unsigned long)compat_ptr(pad); |
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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(s64)); |
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fourth = (unsigned long)up64; |
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err = sys_semctl(first, second, third, fourth); if (err < 0) break; if (copy_from_user(&s64, up64, sizeof(s64))) err2 = -EFAULT; else if (version == IPC_64) err2 = put_compat_semid64_ds(&s64, compat_ptr(pad)); else err2 = put_compat_semid_ds(&s64, compat_ptr(pad)); if (err2) err = -EFAULT; break; case IPC_SET: if (version == IPC_64) { err = get_compat_semid64_ds(&s64, compat_ptr(pad)); } else { err = get_compat_semid_ds(&s64, compat_ptr(pad)); } up64 = compat_alloc_user_space(sizeof(s64)); if (copy_to_user(up64, &s64, sizeof(s64))) err = -EFAULT; if (err) break; |
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fourth = (unsigned long)up64; |
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err = sys_semctl(first, second, third, fourth); break; default: err = -EINVAL; break; } return err; } |
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static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) |
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{ 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 |
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#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC |
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COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second, u32, third, compat_uptr_t, ptr, u32, fifth) { int version; |
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u32 pad; |
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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: |
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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; |
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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, fifth, third, compat_do_msg_fill); } |
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case MSGGET: return sys_msgget(first, second); case MSGCTL: return compat_sys_msgctl(first, second, compat_ptr(ptr)); |
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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)); } |
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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; } |
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#endif COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg) |
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{ return do_compat_semctl(semid, semnum, cmd, arg); } |
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COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp, compat_ssize_t, msgsz, int, msgflg) |
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{ |
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struct compat_msgbuf __user *up = compat_ptr(msgp); |
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compat_long_t mtype; |
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if (get_user(mtype, &up->mtype)) |
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return -EFAULT; |
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return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg); |
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} |
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COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp, compat_ssize_t, msgsz, long, msgtyp, int, msgflg) |
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{ |
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return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, msgtyp, msgflg, compat_do_msg_fill); |
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} |
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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; } 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; } 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; } 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; } long compat_sys_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; |
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memset(&m64, 0, sizeof(m64)); |
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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; } |
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COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg) |
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{ unsigned long ret; long err; |
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err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA); |
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if (err) return err; force_successful_syscall_return(); return (long)ret; } |
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static inline int get_compat_shmid64_ds(struct shmid64_ds *s64, struct compat_shmid64_ds __user *up64) { if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) return -EFAULT; return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm); } static inline int get_compat_shmid_ds(struct shmid64_ds *s, struct compat_shmid_ds __user *up) { if (!access_ok(VERIFY_READ, up, sizeof(*up))) return -EFAULT; return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm); } static inline int put_compat_shmid64_ds(struct shmid64_ds *s64, struct compat_shmid64_ds __user *up64) { int err; if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) return -EFAULT; err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm); err |= __put_user(s64->shm_atime, &up64->shm_atime); err |= __put_user(s64->shm_dtime, &up64->shm_dtime); err |= __put_user(s64->shm_ctime, &up64->shm_ctime); err |= __put_user(s64->shm_segsz, &up64->shm_segsz); err |= __put_user(s64->shm_nattch, &up64->shm_nattch); err |= __put_user(s64->shm_cpid, &up64->shm_cpid); err |= __put_user(s64->shm_lpid, &up64->shm_lpid); return err; } static inline int put_compat_shmid_ds(struct shmid64_ds *s, struct compat_shmid_ds __user *up) { int err; if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) return -EFAULT; err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm); err |= __put_user(s->shm_atime, &up->shm_atime); err |= __put_user(s->shm_dtime, &up->shm_dtime); err |= __put_user(s->shm_ctime, &up->shm_ctime); err |= __put_user(s->shm_segsz, &up->shm_segsz); err |= __put_user(s->shm_nattch, &up->shm_nattch); err |= __put_user(s->shm_cpid, &up->shm_cpid); err |= __put_user(s->shm_lpid, &up->shm_lpid); return err; } static inline int put_compat_shminfo64(struct shminfo64 *smi, struct compat_shminfo64 __user *up64) { int err; if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) return -EFAULT; |
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if (smi->shmmax > INT_MAX) smi->shmmax = INT_MAX; |
1da177e4c Linux-2.6.12-rc2 |
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 |
err = __put_user(smi->shmmax, &up64->shmmax); err |= __put_user(smi->shmmin, &up64->shmmin); err |= __put_user(smi->shmmni, &up64->shmmni); err |= __put_user(smi->shmseg, &up64->shmseg); err |= __put_user(smi->shmall, &up64->shmall); return err; } static inline int put_compat_shminfo(struct shminfo64 *smi, struct shminfo __user *up) { int err; if (!access_ok(VERIFY_WRITE, up, sizeof(*up))) return -EFAULT; |
af7c693f1 Cap shmmax at INT... |
629 630 |
if (smi->shmmax > INT_MAX) smi->shmmax = INT_MAX; |
1da177e4c Linux-2.6.12-rc2 |
631 632 633 634 635 |
err = __put_user(smi->shmmax, &up->shmmax); err |= __put_user(smi->shmmin, &up->shmmin); err |= __put_user(smi->shmmni, &up->shmmni); err |= __put_user(smi->shmseg, &up->shmseg); err |= __put_user(smi->shmall, &up->shmall); |
214a627cb [PATCH] put_compa... |
636 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 |
} static inline int put_compat_shm_info(struct shm_info __user *ip, struct compat_shm_info __user *uip) { int err; struct shm_info si; if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) || copy_from_user(&si, ip, sizeof(si))) return -EFAULT; err = __put_user(si.used_ids, &uip->used_ids); err |= __put_user(si.shm_tot, &uip->shm_tot); err |= __put_user(si.shm_rss, &uip->shm_rss); err |= __put_user(si.shm_swp, &uip->shm_swp); err |= __put_user(si.swap_attempts, &uip->swap_attempts); err |= __put_user(si.swap_successes, &uip->swap_successes); return err; } long compat_sys_shmctl(int first, int second, void __user *uptr) { void __user *p; struct shmid64_ds s64; struct shminfo64 smi; int err, err2; int version = compat_ipc_parse_version(&second); |
03145beb4 ipc: initialize s... |
664 |
memset(&s64, 0, sizeof(s64)); |
1da177e4c Linux-2.6.12-rc2 |
665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 |
switch (second & (~IPC_64)) { case IPC_RMID: case SHM_LOCK: case SHM_UNLOCK: err = sys_shmctl(first, second, uptr); break; case IPC_INFO: p = compat_alloc_user_space(sizeof(smi)); err = sys_shmctl(first, second, p); if (err < 0) break; if (copy_from_user(&smi, p, sizeof(smi))) err2 = -EFAULT; else if (version == IPC_64) err2 = put_compat_shminfo64(&smi, uptr); else err2 = put_compat_shminfo(&smi, uptr); if (err2) err = -EFAULT; break; case IPC_SET: if (version == IPC_64) { err = get_compat_shmid64_ds(&s64, uptr); } else { err = get_compat_shmid_ds(&s64, uptr); } if (err) break; p = compat_alloc_user_space(sizeof(s64)); if (copy_to_user(p, &s64, sizeof(s64))) err = -EFAULT; else err = sys_shmctl(first, second, p); break; case IPC_STAT: case SHM_STAT: p = compat_alloc_user_space(sizeof(s64)); err = sys_shmctl(first, second, p); if (err < 0) break; if (copy_from_user(&s64, p, sizeof(s64))) err2 = -EFAULT; else if (version == IPC_64) err2 = put_compat_shmid64_ds(&s64, uptr); else err2 = put_compat_shmid_ds(&s64, uptr); if (err2) err = -EFAULT; break; case SHM_INFO: p = compat_alloc_user_space(sizeof(struct shm_info)); err = sys_shmctl(first, second, p); if (err < 0) break; err2 = put_compat_shm_info(p, uptr); if (err2) err = -EFAULT; break; default: err = -EINVAL; break; } return err; } long compat_sys_semtimedop(int semid, struct sembuf __user *tsems, unsigned nsops, const struct compat_timespec __user *timeout) { struct timespec __user *ts64 = NULL; if (timeout) { struct timespec ts; ts64 = compat_alloc_user_space(sizeof(*ts64)); if (get_compat_timespec(&ts, timeout)) return -EFAULT; if (copy_to_user(ts64, &ts, sizeof(ts))) return -EFAULT; } return sys_semtimedop(semid, tsems, nsops, ts64); } |