mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
3283f71113
To provide a y2038 safe interface a new symbol __msgctl64 is added
and __msgctl is change to call it instead (it adds some extra buffer
coping for the 32 bit time_t implementation).
Two new structures are added:
1. kernel_msqid64_ds: used internally only on 32-bit architectures
to issue the syscall. A handful of architectures (hppa, i386, mips,
powerpc32, and sparc32) require specific implementations due to
their kernel ABI.
2. msqid_ds64: this is only for __TIMESIZE != 64 to use along with
the 64-bit msgctl. It is different than the kernel struct because
the exported 64-bit time_t might require different alignment
depending on the architecture ABI.
So the resulting implementation does:
1. For 64-bit architectures it assumes msqid_ds already contains
64-bit time_t fields and will result in just the __msgctl symbol
using the __msgctl64 code. The msgid_ds argument is passed as-is
to the syscall.
2. For 32-bit architectures with default 64-bit time_t (newer ABIs
such riscv32 or arc), it will also result in only one exported
symbol but with the required high/low time handling.
3. Finally for 32-bit architecture with both 32-bit and 64-bit time_t
support we follow the already set way to provide one symbol with
64-bit time_t support and implement the 32-bit time_t support using
the 64-bit time_t.
The default 32-bit symbol will allocate and copy the msqid_ds
over multiple buffers, but this should be deprecated in favor
of the __msgctl64 anyway.
Checked on i686-linux-gnu and x86_64-linux-gnu. I also did some sniff
tests on powerpc, powerpc64, mips, mips64, armhf, sparcv9, and
sparc64.
Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Tested-by: Alistair Francis <alistair.francis@wdc.com>
246 lines
7.3 KiB
C
246 lines
7.3 KiB
C
/* Copyright (C) 1995-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/msg.h>
|
|
#include <ipc_priv.h>
|
|
#include <sysdep.h>
|
|
#include <shlib-compat.h>
|
|
#include <errno.h>
|
|
#include <linux/posix_types.h> /* For __kernel_mode_t. */
|
|
|
|
/* POSIX states ipc_perm mode should have type of mode_t. */
|
|
_Static_assert (sizeof ((struct msqid_ds){0}.msg_perm.mode)
|
|
== sizeof (mode_t),
|
|
"sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)");
|
|
|
|
#if __IPC_TIME64 == 0
|
|
typedef struct msqid_ds msgctl_arg_t;
|
|
#else
|
|
# include <struct_kernel_msqid64_ds.h>
|
|
|
|
static void
|
|
msqid64_to_kmsqid64 (const struct __msqid64_ds *msqid64,
|
|
struct kernel_msqid64_ds *kmsqid)
|
|
{
|
|
kmsqid->msg_perm = msqid64->msg_perm;
|
|
kmsqid->msg_stime = msqid64->msg_stime;
|
|
kmsqid->msg_stime_high = msqid64->msg_stime >> 32;
|
|
kmsqid->msg_rtime = msqid64->msg_rtime;
|
|
kmsqid->msg_rtime_high = msqid64->msg_rtime >> 32;
|
|
kmsqid->msg_ctime = msqid64->msg_ctime;
|
|
kmsqid->msg_ctime_high = msqid64->msg_ctime >> 32;
|
|
kmsqid->msg_cbytes = msqid64->msg_cbytes;
|
|
kmsqid->msg_qnum = msqid64->msg_qnum;
|
|
kmsqid->msg_qbytes = msqid64->msg_qbytes;
|
|
kmsqid->msg_lspid = msqid64->msg_lspid;
|
|
kmsqid->msg_lrpid = msqid64->msg_lrpid;
|
|
}
|
|
|
|
static void
|
|
kmsqid64_to_msqid64 (const struct kernel_msqid64_ds *kmsqid,
|
|
struct __msqid64_ds *msqid64)
|
|
{
|
|
msqid64->msg_perm = kmsqid->msg_perm;
|
|
msqid64->msg_stime = kmsqid->msg_stime
|
|
| ((__time64_t) kmsqid->msg_stime_high << 32);
|
|
msqid64->msg_rtime = kmsqid->msg_rtime
|
|
| ((__time64_t) kmsqid->msg_rtime_high << 32);
|
|
msqid64->msg_ctime = kmsqid->msg_ctime
|
|
| ((__time64_t) kmsqid->msg_ctime_high << 32);
|
|
msqid64->msg_cbytes = kmsqid->msg_cbytes;
|
|
msqid64->msg_qnum = kmsqid->msg_qnum;
|
|
msqid64->msg_qbytes = kmsqid->msg_qbytes;
|
|
msqid64->msg_lspid = kmsqid->msg_lspid;
|
|
msqid64->msg_lrpid = kmsqid->msg_lrpid;
|
|
}
|
|
|
|
typedef struct kernel_msqid64_ds msgctl_arg_t;
|
|
#endif
|
|
|
|
static int
|
|
msgctl_syscall (int msqid, int cmd, msgctl_arg_t *buf)
|
|
{
|
|
#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
|
|
return INLINE_SYSCALL_CALL (msgctl, msqid, cmd | __IPC_64, buf);
|
|
#else
|
|
return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd | __IPC_64, 0,
|
|
buf);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
__msgctl64 (int msqid, int cmd, struct __msqid64_ds *buf)
|
|
{
|
|
#if __IPC_TIME64
|
|
struct kernel_msqid64_ds ksemid, *arg = NULL;
|
|
if (buf != NULL)
|
|
{
|
|
msqid64_to_kmsqid64 (buf, &ksemid);
|
|
arg = &ksemid;
|
|
}
|
|
# ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
|
|
if (cmd == IPC_SET)
|
|
arg->msg_perm.mode *= 0x10000U;
|
|
# endif
|
|
#else
|
|
msgctl_arg_t *arg = buf;
|
|
#endif
|
|
|
|
int ret = msgctl_syscall (msqid, cmd, arg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (cmd)
|
|
{
|
|
case IPC_STAT:
|
|
case MSG_STAT:
|
|
case MSG_STAT_ANY:
|
|
#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
|
|
arg->msg_perm.mode >>= 16;
|
|
#else
|
|
/* Old Linux kernel versions might not clear the mode padding. */
|
|
if (sizeof ((struct msqid_ds){0}.msg_perm.mode)
|
|
!= sizeof (__kernel_mode_t))
|
|
arg->msg_perm.mode &= 0xFFFF;
|
|
#endif
|
|
|
|
#if __IPC_TIME64
|
|
kmsqid64_to_msqid64 (arg, buf);
|
|
#endif
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#if __TIMESIZE != 64
|
|
libc_hidden_def (__msgctl64)
|
|
|
|
static void
|
|
msqid_to_msqid64 (struct __msqid64_ds *mq64, const struct msqid_ds *mq)
|
|
{
|
|
mq64->msg_perm = mq->msg_perm;
|
|
mq64->msg_stime = mq->msg_stime
|
|
| ((__time64_t) mq->__msg_stime_high << 32);
|
|
mq64->msg_rtime = mq->msg_rtime
|
|
| ((__time64_t) mq->__msg_rtime_high << 32);
|
|
mq64->msg_ctime = mq->msg_ctime
|
|
| ((__time64_t) mq->__msg_ctime_high << 32);
|
|
mq64->msg_cbytes = mq->msg_cbytes;
|
|
mq64->msg_qnum = mq->msg_qnum;
|
|
mq64->msg_qbytes = mq->msg_qbytes;
|
|
mq64->msg_lspid = mq->msg_lspid;
|
|
mq64->msg_lrpid = mq->msg_lrpid;
|
|
}
|
|
|
|
static void
|
|
msqid64_to_msqid (struct msqid_ds *mq, const struct __msqid64_ds *mq64)
|
|
{
|
|
mq->msg_perm = mq64->msg_perm;
|
|
mq->msg_stime = mq64->msg_stime;
|
|
mq->__msg_stime_high = 0;
|
|
mq->msg_rtime = mq64->msg_rtime;
|
|
mq->__msg_rtime_high = 0;
|
|
mq->msg_ctime = mq64->msg_ctime;
|
|
mq->__msg_ctime_high = 0;
|
|
mq->msg_cbytes = mq64->msg_cbytes;
|
|
mq->msg_qnum = mq64->msg_qnum;
|
|
mq->msg_qbytes = mq64->msg_qbytes;
|
|
mq->msg_lspid = mq64->msg_lspid;
|
|
mq->msg_lrpid = mq64->msg_lrpid;
|
|
}
|
|
|
|
int
|
|
__msgctl (int msqid, int cmd, struct msqid_ds *buf)
|
|
{
|
|
struct __msqid64_ds msqid64, *buf64 = NULL;
|
|
if (buf != NULL)
|
|
{
|
|
msqid_to_msqid64 (&msqid64, buf);
|
|
buf64 = &msqid64;
|
|
}
|
|
|
|
int ret = __msgctl64 (msqid, cmd, buf64);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (cmd)
|
|
{
|
|
case IPC_STAT:
|
|
case MSG_STAT:
|
|
case MSG_STAT_ANY:
|
|
msqid64_to_msqid (buf, buf64);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#ifndef DEFAULT_VERSION
|
|
# ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T
|
|
# define DEFAULT_VERSION GLIBC_2_2
|
|
# else
|
|
# define DEFAULT_VERSION GLIBC_2_31
|
|
# endif
|
|
#endif
|
|
versioned_symbol (libc, __msgctl, msgctl, DEFAULT_VERSION);
|
|
|
|
#if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \
|
|
&& SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31)
|
|
int
|
|
attribute_compat_text_section
|
|
__msgctl_mode16 (int msqid, int cmd, struct msqid_ds *buf)
|
|
{
|
|
return msgctl_syscall (msqid, cmd, (msgctl_arg_t *) buf);
|
|
}
|
|
compat_symbol (libc, __msgctl_mode16, msgctl, GLIBC_2_2);
|
|
#endif
|
|
|
|
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
|
|
struct __old_msqid_ds
|
|
{
|
|
struct __old_ipc_perm msg_perm; /* structure describing operation permission */
|
|
struct msg *__msg_first; /* pointer to first message on queue */
|
|
struct msg *__msg_last; /* pointer to last message on queue */
|
|
__time_t msg_stime; /* time of last msgsnd command */
|
|
__time_t msg_rtime; /* time of last msgrcv command */
|
|
__time_t msg_ctime; /* time of last change */
|
|
struct wait_queue *__wwait; /* ??? */
|
|
struct wait_queue *__rwait; /* ??? */
|
|
unsigned short int __msg_cbytes; /* current number of bytes on queue */
|
|
unsigned short int msg_qnum; /* number of messages currently on queue */
|
|
unsigned short int msg_qbytes; /* max number of bytes allowed on queue */
|
|
__ipc_pid_t msg_lspid; /* pid of last msgsnd() */
|
|
__ipc_pid_t msg_lrpid; /* pid of last msgrcv() */
|
|
};
|
|
|
|
int
|
|
attribute_compat_text_section
|
|
__old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf)
|
|
{
|
|
#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \
|
|
&& !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64
|
|
/* For architecture that have wire-up msgctl but also have __IPC_64 to a
|
|
value different than default (0x0) it means the compat symbol used the
|
|
__NR_ipc syscall. */
|
|
return INLINE_SYSCALL_CALL (msgctl, msqid, cmd, buf);
|
|
#else
|
|
return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd, 0, buf);
|
|
#endif
|
|
}
|
|
compat_symbol (libc, __old_msgctl, msgctl, GLIBC_2_0);
|
|
#endif
|