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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212// SPDX-License-Identifier: GPL-2.0/* * sys_ipc() is the old de-multiplexer for the SysV IPC calls. * * This is really horribly ugly, and new architectures should just wire up * the individual syscalls instead. */#include <linux/unistd.h>#include <linux/syscalls.h>#include <linux/security.h>#include <linux/ipc_namespace.h>#include "util.h"
#ifdef __ARCH_WANT_SYS_IPC#include <linux/errno.h>#include <linux/ipc.h>#include <linux/shm.h>#include <linux/uaccess.h>
int ksys_ipc(unsigned int call, int first, unsigned long second, unsigned long third, void __user * ptr, long fifth){ int version, ret;
version = call >> 16; /* hack for backward compatibility */ call &= 0xffff;
switch (call) { case SEMOP: return ksys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL); case SEMTIMEDOP: if (IS_ENABLED(CONFIG_64BIT)) return ksys_semtimedop(first, ptr, second, (const struct __kernel_timespec __user *)fifth); else if (IS_ENABLED(CONFIG_COMPAT_32BIT_TIME)) return compat_ksys_semtimedop(first, ptr, second, (const struct old_timespec32 __user *)fifth); else return -ENOSYS;
case SEMGET: return ksys_semget(first, second, third); case SEMCTL: { unsigned long arg; if (!ptr) return -EINVAL; if (get_user(arg, (unsigned long __user *) ptr)) return -EFAULT; return ksys_old_semctl(first, second, third, arg); }
case MSGSND: return ksys_msgsnd(first, (struct msgbuf __user *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; if (!ptr) return -EINVAL;
if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof(tmp))) return -EFAULT; return ksys_msgrcv(first, tmp.msgp, second, tmp.msgtyp, third); } default: return ksys_msgrcv(first, (struct msgbuf __user *) ptr, second, fifth, third); } case MSGGET: return ksys_msgget((key_t) first, second); case MSGCTL: return ksys_old_msgctl(first, second, (struct msqid_ds __user *)ptr);
case SHMAT: switch (version) { default: { unsigned long raddr; ret = do_shmat(first, (char __user *)ptr, second, &raddr, SHMLBA); if (ret) return ret; return put_user(raddr, (unsigned long __user *) third); } case 1: /* * This was the entry point for kernel-originating calls * from iBCS2 in 2.2 days. */ return -EINVAL; } case SHMDT: return ksys_shmdt((char __user *)ptr); case SHMGET: return ksys_shmget(first, second, third); case SHMCTL: return ksys_old_shmctl(first, second, (struct shmid_ds __user *) ptr); default: return -ENOSYS; }}
SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second, unsigned long, third, void __user *, ptr, long, fifth){ return ksys_ipc(call, first, second, third, ptr, fifth);}#endif
#ifdef CONFIG_COMPAT#include <linux/compat.h>
#ifndef COMPAT_SHMLBA#define COMPAT_SHMLBA SHMLBA#endif
struct compat_ipc_kludge { compat_uptr_t msgp; compat_long_t msgtyp;};
#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPCint compat_ksys_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 ksys_semtimedop(first, compat_ptr(ptr), second, NULL); case SEMTIMEDOP: if (!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME)) return -ENOSYS; return compat_ksys_semtimedop(first, compat_ptr(ptr), second, compat_ptr(fifth)); case SEMGET: return ksys_semget(first, second, third); case SEMCTL: if (!ptr) return -EINVAL; if (get_user(pad, (u32 __user *) compat_ptr(ptr))) return -EFAULT; return compat_ksys_old_semctl(first, second, third, pad);
case MSGSND: return compat_ksys_msgsnd(first, ptr, 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; return compat_ksys_msgrcv(first, ipck.msgp, second, ipck.msgtyp, third); } return compat_ksys_msgrcv(first, ptr, second, fifth, third); } case MSGGET: return ksys_msgget(first, second); case MSGCTL: return compat_ksys_old_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 __user *)compat_ptr(third)); } case SHMDT: return ksys_shmdt(compat_ptr(ptr)); case SHMGET: return ksys_shmget(first, (unsigned int)second, third); case SHMCTL: return compat_ksys_old_shmctl(first, second, compat_ptr(ptr)); }
return -ENOSYS;}
COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second, u32, third, compat_uptr_t, ptr, u32, fifth){ return compat_ksys_ipc(call, first, second, third, ptr, fifth);}#endif#endif