mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 02:40:06 +00:00
ffd178c651
To provide a y2038 safe interface a new symbol __shmctl64 is added and __shmctl is change to call it instead (it adds some extra buffer copying for the 32 bit time_t implementation). Two new structures are added: 1. kernel_shmid64_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. shmid_ds64: this is only for __TIMESIZE != 64 to use along with the 64-bit shmctl. 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 shmid_ds already contains 64-bit time_t fields and will result in just the __shmctl symbol using the __shmctl64 code. The shmid_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 of the 64-bit one. The default 32-bit symbol will allocate and copy the shmid_ds over multiple buffers, but this should be deprecated in favor of the __shmctl64 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. Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Tested-by: Alistair Francis <alistair.francis@wdc.com> Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
245 lines
7.2 KiB
C
245 lines
7.2 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/shm.h>
|
|
#include <stdarg.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 shmid_ds){0}.shm_perm.mode)
|
|
== sizeof (mode_t),
|
|
"sizeof (shmid_ds.shm_perm.mode) != sizeof (mode_t)");
|
|
|
|
#if __IPC_TIME64 == 0
|
|
typedef struct shmid_ds shmctl_arg_t;
|
|
#else
|
|
# include <struct_kernel_shmid64_ds.h>
|
|
|
|
static void
|
|
shmid64_to_kshmid64 (const struct __shmid64_ds *shmid64,
|
|
struct kernel_shmid64_ds *kshmid)
|
|
{
|
|
kshmid->shm_perm = shmid64->shm_perm;
|
|
kshmid->shm_segsz = shmid64->shm_segsz;
|
|
kshmid->shm_atime = shmid64->shm_atime;
|
|
kshmid->shm_atime_high = shmid64->shm_atime >> 32;
|
|
kshmid->shm_dtime = shmid64->shm_dtime;
|
|
kshmid->shm_dtime_high = shmid64->shm_dtime >> 32;
|
|
kshmid->shm_ctime = shmid64->shm_ctime;
|
|
kshmid->shm_ctime_high = shmid64->shm_ctime >> 32;
|
|
kshmid->shm_cpid = shmid64->shm_cpid;
|
|
kshmid->shm_lpid = shmid64->shm_lpid;
|
|
kshmid->shm_nattch = shmid64->shm_nattch;
|
|
}
|
|
|
|
static void
|
|
kshmid64_to_shmid64 (const struct kernel_shmid64_ds *kshmid,
|
|
struct __shmid64_ds *shmid64)
|
|
{
|
|
shmid64->shm_perm = kshmid->shm_perm;
|
|
shmid64->shm_segsz = kshmid->shm_segsz;
|
|
shmid64->shm_atime = kshmid->shm_atime
|
|
| ((__time64_t) kshmid->shm_atime_high << 32);
|
|
shmid64->shm_dtime = kshmid->shm_dtime
|
|
| ((__time64_t) kshmid->shm_dtime_high << 32);
|
|
shmid64->shm_ctime = kshmid->shm_ctime
|
|
| ((__time64_t) kshmid->shm_ctime_high << 32);
|
|
shmid64->shm_cpid = kshmid->shm_cpid;
|
|
shmid64->shm_lpid = kshmid->shm_lpid;
|
|
shmid64->shm_nattch = kshmid->shm_nattch;
|
|
}
|
|
|
|
typedef struct kernel_shmid64_ds shmctl_arg_t;
|
|
#endif
|
|
|
|
static int
|
|
shmctl_syscall (int shmid, int cmd, shmctl_arg_t *buf)
|
|
{
|
|
#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
|
|
return INLINE_SYSCALL_CALL (shmctl, shmid, cmd | __IPC_64, buf);
|
|
#else
|
|
return INLINE_SYSCALL_CALL (ipc, IPCOP_shmctl, shmid, cmd | __IPC_64, 0,
|
|
buf);
|
|
#endif
|
|
}
|
|
|
|
/* Provide operations to control over shared memory segments. */
|
|
int
|
|
__shmctl64 (int shmid, int cmd, struct __shmid64_ds *buf)
|
|
{
|
|
#if __IPC_TIME64
|
|
struct kernel_shmid64_ds kshmid, *arg = NULL;
|
|
if (buf != NULL)
|
|
{
|
|
shmid64_to_kshmid64 (buf, &kshmid);
|
|
arg = &kshmid;
|
|
}
|
|
# ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
|
|
if (cmd == IPC_SET)
|
|
arg->shm_perm.mode *= 0x10000U;
|
|
# endif
|
|
#else
|
|
shmctl_arg_t *arg = buf;
|
|
#endif
|
|
|
|
int ret = shmctl_syscall (shmid, cmd, arg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (cmd)
|
|
{
|
|
case IPC_INFO:
|
|
case IPC_STAT:
|
|
case SHM_STAT:
|
|
case SHM_STAT_ANY:
|
|
#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
|
|
arg->shm_perm.mode >>= 16;
|
|
#else
|
|
/* Old Linux kernel versions might not clear the mode padding. */
|
|
if (sizeof ((struct shmid_ds){0}.shm_perm.mode)
|
|
!= sizeof (__kernel_mode_t))
|
|
arg->shm_perm.mode &= 0xFFFF;
|
|
#endif
|
|
|
|
#if __IPC_TIME64
|
|
kshmid64_to_shmid64 (arg, buf);
|
|
#endif
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#if __TIMESIZE != 64
|
|
libc_hidden_def (__shmctl64)
|
|
|
|
static void
|
|
shmid_to_shmid64 (struct __shmid64_ds *shm64, const struct shmid_ds *shm)
|
|
{
|
|
shm64->shm_perm = shm->shm_perm;
|
|
shm64->shm_segsz = shm->shm_segsz;
|
|
shm64->shm_atime = shm->shm_atime
|
|
| ((__time64_t) shm->__shm_atime_high << 32);
|
|
shm64->shm_dtime = shm->shm_dtime
|
|
| ((__time64_t) shm->__shm_dtime_high << 32);
|
|
shm64->shm_ctime = shm->shm_ctime
|
|
| ((__time64_t) shm->__shm_ctime_high << 32);
|
|
shm64->shm_cpid = shm->shm_cpid;
|
|
shm64->shm_lpid = shm->shm_lpid;
|
|
shm64->shm_nattch = shm->shm_nattch;
|
|
}
|
|
|
|
static void
|
|
shmid64_to_shmid (struct shmid_ds *shm, const struct __shmid64_ds *shm64)
|
|
{
|
|
shm->shm_perm = shm64->shm_perm;
|
|
shm->shm_segsz = shm64->shm_segsz;
|
|
shm->shm_atime = shm64->shm_atime;
|
|
shm->__shm_atime_high = 0;
|
|
shm->shm_dtime = shm64->shm_dtime;
|
|
shm->__shm_dtime_high = 0;
|
|
shm->shm_ctime = shm64->shm_ctime;
|
|
shm->__shm_ctime_high = 0;
|
|
shm->shm_cpid = shm64->shm_cpid;
|
|
shm->shm_lpid = shm64->shm_lpid;
|
|
shm->shm_nattch = shm64->shm_nattch;
|
|
}
|
|
|
|
int
|
|
__shmctl (int shmid, int cmd, struct shmid_ds *buf)
|
|
{
|
|
struct __shmid64_ds shmid64, *buf64 = NULL;
|
|
if (buf != NULL)
|
|
{
|
|
shmid_to_shmid64 (&shmid64, buf);
|
|
buf64 = &shmid64;
|
|
}
|
|
|
|
int ret = __shmctl64 (shmid, cmd, buf64);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (cmd)
|
|
{
|
|
case IPC_INFO:
|
|
case IPC_STAT:
|
|
case SHM_STAT:
|
|
case SHM_STAT_ANY:
|
|
shmid64_to_shmid (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, __shmctl, shmctl, DEFAULT_VERSION);
|
|
|
|
#if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \
|
|
&& SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31)
|
|
int
|
|
attribute_compat_text_section
|
|
__shmctl_mode16 (int shmid, int cmd, struct shmid_ds *buf)
|
|
{
|
|
return shmctl_syscall (shmid, cmd, (shmctl_arg_t *) buf);
|
|
}
|
|
compat_symbol (libc, __shmctl_mode16, shmctl, GLIBC_2_2);
|
|
#endif
|
|
|
|
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
|
|
struct __old_shmid_ds
|
|
{
|
|
struct __old_ipc_perm shm_perm; /* operation permission struct */
|
|
int shm_segsz; /* size of segment in bytes */
|
|
__time_t shm_atime; /* time of last shmat() */
|
|
__time_t shm_dtime; /* time of last shmdt() */
|
|
__time_t shm_ctime; /* time of last change by shmctl() */
|
|
__ipc_pid_t shm_cpid; /* pid of creator */
|
|
__ipc_pid_t shm_lpid; /* pid of last shmop */
|
|
unsigned short int shm_nattch; /* number of current attaches */
|
|
unsigned short int __shm_npages; /* size of segment (pages) */
|
|
unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */
|
|
struct vm_area_struct *__attaches; /* descriptors for attaches */
|
|
};
|
|
|
|
int
|
|
attribute_compat_text_section
|
|
__old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf)
|
|
{
|
|
#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \
|
|
&& !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64
|
|
/* For architecture that have wire-up shmctl 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 (shmctl, shmid, cmd, buf);
|
|
#else
|
|
return INLINE_SYSCALL_CALL (ipc, IPCOP_shmctl, shmid, cmd, 0, buf);
|
|
#endif
|
|
}
|
|
compat_symbol (libc, __old_shmctl, shmctl, GLIBC_2_0);
|
|
#endif
|