mirror of
https://sourceware.org/git/glibc.git
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9ebaabeaac
It avoids regressions on possible future commands that might require additional libc support. The downside is new commands added by newer kernels will need further glibc support. Checked on x86_64-linux-gnu and i686-linux-gnu (Linux v4.15 and v5.4).
281 lines
7.9 KiB
C
281 lines
7.9 KiB
C
/* Copyright (C) 1995-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
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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_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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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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}
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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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