diff options
Diffstat (limited to 'ipc/syscall.c')
| -rw-r--r-- | ipc/syscall.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/ipc/syscall.c b/ipc/syscall.c new file mode 100644 index 000000000..dfb0e988d --- /dev/null +++ b/ipc/syscall.c @@ -0,0 +1,211 @@ +// 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_IPC +int 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 |