mirror of
https://sourceware.org/git/glibc.git
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292 lines
8.3 KiB
C
292 lines
8.3 KiB
C
/* Copyright (C) 1995-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/shm.h>
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#include <stdarg.h>
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#include <ipc_priv.h>
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#include <sysdep.h>
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#include <shlib-compat.h>
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#include <errno.h>
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#include <linux/posix_types.h> /* For __kernel_mode_t. */
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/* POSIX states ipc_perm mode should have type of mode_t. */
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_Static_assert (sizeof ((struct shmid_ds){0}.shm_perm.mode)
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== sizeof (mode_t),
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"sizeof (shmid_ds.shm_perm.mode) != sizeof (mode_t)");
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#if __IPC_TIME64 == 0
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typedef struct shmid_ds shmctl_arg_t;
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#else
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# include <struct_kernel_shmid64_ds.h>
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static void
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shmid64_to_kshmid64 (const struct __shmid64_ds *shmid64,
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struct kernel_shmid64_ds *kshmid)
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{
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kshmid->shm_perm = shmid64->shm_perm;
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kshmid->shm_segsz = shmid64->shm_segsz;
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kshmid->shm_atime = shmid64->shm_atime;
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kshmid->shm_atime_high = shmid64->shm_atime >> 32;
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kshmid->shm_dtime = shmid64->shm_dtime;
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kshmid->shm_dtime_high = shmid64->shm_dtime >> 32;
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kshmid->shm_ctime = shmid64->shm_ctime;
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kshmid->shm_ctime_high = shmid64->shm_ctime >> 32;
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kshmid->shm_cpid = shmid64->shm_cpid;
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kshmid->shm_lpid = shmid64->shm_lpid;
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kshmid->shm_nattch = shmid64->shm_nattch;
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}
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static void
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kshmid64_to_shmid64 (const struct kernel_shmid64_ds *kshmid,
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struct __shmid64_ds *shmid64)
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{
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shmid64->shm_perm = kshmid->shm_perm;
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shmid64->shm_segsz = kshmid->shm_segsz;
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shmid64->shm_atime = kshmid->shm_atime
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| ((__time64_t) kshmid->shm_atime_high << 32);
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shmid64->shm_dtime = kshmid->shm_dtime
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| ((__time64_t) kshmid->shm_dtime_high << 32);
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shmid64->shm_ctime = kshmid->shm_ctime
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| ((__time64_t) kshmid->shm_ctime_high << 32);
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shmid64->shm_cpid = kshmid->shm_cpid;
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shmid64->shm_lpid = kshmid->shm_lpid;
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shmid64->shm_nattch = kshmid->shm_nattch;
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}
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typedef struct kernel_shmid64_ds shmctl_arg_t;
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#endif
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static int
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shmctl_syscall (int shmid, int cmd, shmctl_arg_t *buf)
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{
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#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
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return INLINE_SYSCALL_CALL (shmctl, shmid, cmd | __IPC_64, buf);
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#else
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return INLINE_SYSCALL_CALL (ipc, IPCOP_shmctl, shmid, cmd | __IPC_64, 0,
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buf);
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#endif
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}
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/* Provide operations to control over shared memory segments. */
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int
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__shmctl64 (int shmid, int cmd, struct __shmid64_ds *buf)
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{
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#if IPC_CTL_NEED_TRANSLATION
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# if __IPC_TIME64
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struct kernel_shmid64_ds kshmid, *arg = NULL;
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# else
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shmctl_arg_t *arg;
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# endif
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/* Some applications pass the __IPC_64 flag in cmd, to invoke
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previously unsupported commands back when there was no EINVAL
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error checking in glibc. Mask the flag for the switch statements
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below. shmctl_syscall adds back the __IPC_64 flag for the actual
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system call. */
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cmd &= ~__IPC_64;
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switch (cmd)
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{
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case IPC_RMID:
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case SHM_LOCK:
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case SHM_UNLOCK:
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arg = NULL;
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break;
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case IPC_SET:
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case IPC_STAT:
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case SHM_STAT:
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case SHM_STAT_ANY:
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# if __IPC_TIME64
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if (buf != NULL)
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{
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shmid64_to_kshmid64 (buf, &kshmid);
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arg = &kshmid;
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}
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# ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
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if (cmd == IPC_SET)
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arg->shm_perm.mode *= 0x10000U;
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# endif
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# else
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arg = buf;
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# endif
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break;
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case IPC_INFO:
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case SHM_INFO:
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/* This is a Linux extension where kernel expects either a
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'struct shminfo' (IPC_INFO) or 'struct shm_info' (SHM_INFO). */
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arg = (__typeof__ (arg)) buf;
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break;
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default:
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__set_errno (EINVAL);
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return -1;
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}
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int ret = shmctl_syscall (shmid, cmd, arg);
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if (ret < 0)
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return ret;
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switch (cmd)
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{
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case IPC_STAT:
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case SHM_STAT:
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case SHM_STAT_ANY:
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# ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
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arg->shm_perm.mode >>= 16;
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# else
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/* Old Linux kernel versions might not clear the mode padding. */
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if (sizeof ((struct shmid_ds){0}.shm_perm.mode)
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!= sizeof (__kernel_mode_t))
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arg->shm_perm.mode &= 0xFFFF;
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# endif
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# if __IPC_TIME64
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kshmid64_to_shmid64 (arg, buf);
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# endif
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}
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return ret;
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#else /* !IPC_CTL_NEED_TRANSLATION */
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return shmctl_syscall (shmid, cmd, buf);
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#endif
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}
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#if __TIMESIZE != 64
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libc_hidden_def (__shmctl64)
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static void
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shmid_to_shmid64 (struct __shmid64_ds *shm64, const struct shmid_ds *shm)
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{
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shm64->shm_perm = shm->shm_perm;
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shm64->shm_segsz = shm->shm_segsz;
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shm64->shm_atime = shm->shm_atime
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| ((__time64_t) shm->__shm_atime_high << 32);
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shm64->shm_dtime = shm->shm_dtime
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| ((__time64_t) shm->__shm_dtime_high << 32);
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shm64->shm_ctime = shm->shm_ctime
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| ((__time64_t) shm->__shm_ctime_high << 32);
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shm64->shm_cpid = shm->shm_cpid;
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shm64->shm_lpid = shm->shm_lpid;
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shm64->shm_nattch = shm->shm_nattch;
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}
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static void
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shmid64_to_shmid (struct shmid_ds *shm, const struct __shmid64_ds *shm64)
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{
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shm->shm_perm = shm64->shm_perm;
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shm->shm_segsz = shm64->shm_segsz;
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shm->shm_atime = shm64->shm_atime;
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shm->__shm_atime_high = 0;
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shm->shm_dtime = shm64->shm_dtime;
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shm->__shm_dtime_high = 0;
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shm->shm_ctime = shm64->shm_ctime;
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shm->__shm_ctime_high = 0;
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shm->shm_cpid = shm64->shm_cpid;
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shm->shm_lpid = shm64->shm_lpid;
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shm->shm_nattch = shm64->shm_nattch;
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}
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int
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__shmctl (int shmid, int cmd, struct shmid_ds *buf)
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{
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struct __shmid64_ds shmid64, *buf64 = NULL;
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if (buf != NULL)
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{
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/* This is a Linux extension where kernel expects either a
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'struct shminfo' (IPC_INFO) or 'struct shm_info' (SHM_INFO). */
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if (cmd == IPC_INFO || cmd == SHM_INFO)
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buf64 = (struct __shmid64_ds *) buf;
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else
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{
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shmid_to_shmid64 (&shmid64, buf);
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buf64 = &shmid64;
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}
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}
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int ret = __shmctl64 (shmid, cmd, buf64);
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if (ret < 0)
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return ret;
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switch (cmd)
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{
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case IPC_STAT:
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case SHM_STAT:
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case SHM_STAT_ANY:
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shmid64_to_shmid (buf, buf64);
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}
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return ret;
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}
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#endif
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#ifndef DEFAULT_VERSION
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# ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T
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# define DEFAULT_VERSION GLIBC_2_2
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# else
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# define DEFAULT_VERSION GLIBC_2_31
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# endif
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#endif
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versioned_symbol (libc, __shmctl, shmctl, DEFAULT_VERSION);
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#if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \
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&& SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31)
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int
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attribute_compat_text_section
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__shmctl_mode16 (int shmid, int cmd, struct shmid_ds *buf)
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{
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return shmctl_syscall (shmid, cmd, (shmctl_arg_t *) buf);
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}
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compat_symbol (libc, __shmctl_mode16, shmctl, GLIBC_2_2);
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#endif
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
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struct __old_shmid_ds
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{
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struct __old_ipc_perm shm_perm; /* operation permission struct */
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int shm_segsz; /* size of segment in bytes */
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__time_t shm_atime; /* time of last shmat() */
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__time_t shm_dtime; /* time of last shmdt() */
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__time_t shm_ctime; /* time of last change by shmctl() */
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__ipc_pid_t shm_cpid; /* pid of creator */
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__ipc_pid_t shm_lpid; /* pid of last shmop */
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unsigned short int shm_nattch; /* number of current attaches */
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unsigned short int __shm_npages; /* size of segment (pages) */
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unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */
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struct vm_area_struct *__attaches; /* descriptors for attaches */
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};
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int
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attribute_compat_text_section
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__old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf)
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{
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#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \
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&& !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64
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/* For architecture that have wire-up shmctl but also have __IPC_64 to a
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value different than default (0x0), it means the compat symbol used the
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__NR_ipc syscall. */
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return INLINE_SYSCALL_CALL (shmctl, shmid, cmd, buf);
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#else
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return INLINE_SYSCALL_CALL (ipc, IPCOP_shmctl, shmid, cmd, 0, buf);
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#endif
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}
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compat_symbol (libc, __old_shmctl, shmctl, GLIBC_2_0);
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#endif
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