lkml.org 
[lkml]   [2020]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip: x86/entry] x86/entry/32: Use IA32-specific wrappers for syscalls taking 64-bit arguments
The following commit has been merged into the x86/entry branch of tip:

Commit-ID: 121b32a58a3af89a780cf194ce3769fc4120e574
Gitweb: https://git.kernel.org/tip/121b32a58a3af89a780cf194ce3769fc4120e574
Author: Brian Gerst <brgerst@gmail.com>
AuthorDate: Fri, 13 Mar 2020 15:51:41 -04:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 21 Mar 2020 16:03:24 +01:00

x86/entry/32: Use IA32-specific wrappers for syscalls taking 64-bit arguments

For the 32-bit syscall interface, 64-bit arguments (loff_t) are passed via
a pair of 32-bit registers. These register pairs end up in consecutive stack
slots, which matches the C ABI for 64-bit arguments. But when accessing the
registers directly from pt_regs, the wrapper needs to manually reassemble the
64-bit value. These wrappers already exist for 32-bit compat, so make them
available to 32-bit native in preparation for enabling pt_regs-based syscalls.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-16-brgerst@gmail.com

---
arch/x86/entry/syscalls/syscall_32.tbl | 18 +-
arch/x86/ia32/Makefile | 2 +-
arch/x86/ia32/sys_ia32.c | 254 +------------------------
arch/x86/kernel/Makefile | 2 +-
arch/x86/kernel/sys_ia32.c | 255 ++++++++++++++++++++++++-
arch/x86/um/Makefile | 1 +-
6 files changed, 268 insertions(+), 264 deletions(-)
delete mode 100644 arch/x86/ia32/sys_ia32.c
create mode 100644 arch/x86/kernel/sys_ia32.c

diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 0b8e24c..54581ac 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -191,8 +191,8 @@
177 i386 rt_sigtimedwait sys_rt_sigtimedwait_time32 compat_sys_rt_sigtimedwait_time32
178 i386 rt_sigqueueinfo sys_rt_sigqueueinfo compat_sys_rt_sigqueueinfo
179 i386 rt_sigsuspend sys_rt_sigsuspend compat_sys_rt_sigsuspend
-180 i386 pread64 sys_pread64 compat_sys_ia32_pread64
-181 i386 pwrite64 sys_pwrite64 compat_sys_ia32_pwrite64
+180 i386 pread64 sys_ia32_pread64
+181 i386 pwrite64 sys_ia32_pwrite64
182 i386 chown sys_chown16
183 i386 getcwd sys_getcwd
184 i386 capget sys_capget
@@ -204,8 +204,8 @@
190 i386 vfork sys_vfork
191 i386 ugetrlimit sys_getrlimit compat_sys_getrlimit
192 i386 mmap2 sys_mmap_pgoff
-193 i386 truncate64 sys_truncate64 compat_sys_ia32_truncate64
-194 i386 ftruncate64 sys_ftruncate64 compat_sys_ia32_ftruncate64
+193 i386 truncate64 sys_ia32_truncate64
+194 i386 ftruncate64 sys_ia32_ftruncate64
195 i386 stat64 sys_stat64 compat_sys_ia32_stat64
196 i386 lstat64 sys_lstat64 compat_sys_ia32_lstat64
197 i386 fstat64 sys_fstat64 compat_sys_ia32_fstat64
@@ -236,7 +236,7 @@
# 222 is unused
# 223 is unused
224 i386 gettid sys_gettid
-225 i386 readahead sys_readahead compat_sys_ia32_readahead
+225 i386 readahead sys_ia32_readahead
226 i386 setxattr sys_setxattr
227 i386 lsetxattr sys_lsetxattr
228 i386 fsetxattr sys_fsetxattr
@@ -261,7 +261,7 @@
247 i386 io_getevents sys_io_getevents_time32
248 i386 io_submit sys_io_submit compat_sys_io_submit
249 i386 io_cancel sys_io_cancel
-250 i386 fadvise64 sys_fadvise64 compat_sys_ia32_fadvise64
+250 i386 fadvise64 sys_ia32_fadvise64
# 251 is available for reuse (was briefly sys_set_zone_reclaim)
252 i386 exit_group sys_exit_group
253 i386 lookup_dcookie sys_lookup_dcookie compat_sys_lookup_dcookie
@@ -283,7 +283,7 @@
269 i386 fstatfs64 sys_fstatfs64 compat_sys_fstatfs64
270 i386 tgkill sys_tgkill
271 i386 utimes sys_utimes_time32
-272 i386 fadvise64_64 sys_fadvise64_64 compat_sys_ia32_fadvise64_64
+272 i386 fadvise64_64 sys_ia32_fadvise64_64
273 i386 vserver
274 i386 mbind sys_mbind
275 i386 get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy
@@ -325,7 +325,7 @@
311 i386 set_robust_list sys_set_robust_list compat_sys_set_robust_list
312 i386 get_robust_list sys_get_robust_list compat_sys_get_robust_list
313 i386 splice sys_splice
-314 i386 sync_file_range sys_sync_file_range compat_sys_ia32_sync_file_range
+314 i386 sync_file_range sys_ia32_sync_file_range
315 i386 tee sys_tee
316 i386 vmsplice sys_vmsplice compat_sys_vmsplice
317 i386 move_pages sys_move_pages compat_sys_move_pages
@@ -335,7 +335,7 @@
321 i386 signalfd sys_signalfd compat_sys_signalfd
322 i386 timerfd_create sys_timerfd_create
323 i386 eventfd sys_eventfd
-324 i386 fallocate sys_fallocate compat_sys_ia32_fallocate
+324 i386 fallocate sys_ia32_fallocate
325 i386 timerfd_settime sys_timerfd_settime32
326 i386 timerfd_gettime sys_timerfd_gettime32
327 i386 signalfd4 sys_signalfd4 compat_sys_signalfd4
diff --git a/arch/x86/ia32/Makefile b/arch/x86/ia32/Makefile
index d13b352..8e4d039 100644
--- a/arch/x86/ia32/Makefile
+++ b/arch/x86/ia32/Makefile
@@ -3,7 +3,7 @@
# Makefile for the ia32 kernel emulation subsystem.
#

-obj-$(CONFIG_IA32_EMULATION) := sys_ia32.o ia32_signal.o
+obj-$(CONFIG_IA32_EMULATION) := ia32_signal.o

obj-$(CONFIG_IA32_AOUT) += ia32_aout.o

diff --git a/arch/x86/ia32/sys_ia32.c b/arch/x86/ia32/sys_ia32.c
deleted file mode 100644
index a189dc6..0000000
--- a/arch/x86/ia32/sys_ia32.c
+++ /dev/null
@@ -1,254 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
- * sys_sparc32
- *
- * Copyright (C) 2000 VA Linux Co
- * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
- * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
- * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 2000 Hewlett-Packard Co.
- * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
- * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
- *
- * These routines maintain argument size conversion between 32bit and 64bit
- * environment. In 2.5 most of this should be moved to a generic directory.
- *
- * This file assumes that there is a hole at the end of user address space.
- *
- * Some of the functions are LE specific currently. These are
- * hopefully all marked. This should be fixed.
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/signal.h>
-#include <linux/syscalls.h>
-#include <linux/times.h>
-#include <linux/utsname.h>
-#include <linux/mm.h>
-#include <linux/uio.h>
-#include <linux/poll.h>
-#include <linux/personality.h>
-#include <linux/stat.h>
-#include <linux/rwsem.h>
-#include <linux/compat.h>
-#include <linux/vfs.h>
-#include <linux/ptrace.h>
-#include <linux/highuid.h>
-#include <linux/sysctl.h>
-#include <linux/slab.h>
-#include <linux/sched/task.h>
-#include <asm/mman.h>
-#include <asm/types.h>
-#include <linux/uaccess.h>
-#include <linux/atomic.h>
-#include <asm/vgtod.h>
-#include <asm/ia32.h>
-
-#define AA(__x) ((unsigned long)(__x))
-
-
-COMPAT_SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
- unsigned long, offset_low, unsigned long, offset_high)
-{
- return ksys_truncate(filename,
- ((loff_t) offset_high << 32) | offset_low);
-}
-
-COMPAT_SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
- unsigned long, offset_low, unsigned long, offset_high)
-{
- return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
-}
-
-/*
- * Another set for IA32/LFS -- x86_64 struct stat is different due to
- * support for 64bit inode numbers.
- */
-static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
-{
- typeof(ubuf->st_uid) uid = 0;
- typeof(ubuf->st_gid) gid = 0;
- SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
- SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
- if (!access_ok(ubuf, sizeof(struct stat64)) ||
- __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
- __put_user(stat->ino, &ubuf->__st_ino) ||
- __put_user(stat->ino, &ubuf->st_ino) ||
- __put_user(stat->mode, &ubuf->st_mode) ||
- __put_user(stat->nlink, &ubuf->st_nlink) ||
- __put_user(uid, &ubuf->st_uid) ||
- __put_user(gid, &ubuf->st_gid) ||
- __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
- __put_user(stat->size, &ubuf->st_size) ||
- __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
- __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
- __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
- __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
- __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
- __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
- __put_user(stat->blksize, &ubuf->st_blksize) ||
- __put_user(stat->blocks, &ubuf->st_blocks))
- return -EFAULT;
- return 0;
-}
-
-COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename,
- struct stat64 __user *, statbuf)
-{
- struct kstat stat;
- int ret = vfs_stat(filename, &stat);
-
- if (!ret)
- ret = cp_stat64(statbuf, &stat);
- return ret;
-}
-
-COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename,
- struct stat64 __user *, statbuf)
-{
- struct kstat stat;
- int ret = vfs_lstat(filename, &stat);
- if (!ret)
- ret = cp_stat64(statbuf, &stat);
- return ret;
-}
-
-COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd,
- struct stat64 __user *, statbuf)
-{
- struct kstat stat;
- int ret = vfs_fstat(fd, &stat);
- if (!ret)
- ret = cp_stat64(statbuf, &stat);
- return ret;
-}
-
-COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd,
- const char __user *, filename,
- struct stat64 __user *, statbuf, int, flag)
-{
- struct kstat stat;
- int error;
-
- error = vfs_fstatat(dfd, filename, &stat, flag);
- if (error)
- return error;
- return cp_stat64(statbuf, &stat);
-}
-
-/*
- * Linux/i386 didn't use to be able to handle more than
- * 4 system call parameters, so these system calls used a memory
- * block for parameter passing..
- */
-
-struct mmap_arg_struct32 {
- unsigned int addr;
- unsigned int len;
- unsigned int prot;
- unsigned int flags;
- unsigned int fd;
- unsigned int offset;
-};
-
-COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg)
-{
- struct mmap_arg_struct32 a;
-
- if (copy_from_user(&a, arg, sizeof(a)))
- return -EFAULT;
-
- if (a.offset & ~PAGE_MASK)
- return -EINVAL;
-
- return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
- a.offset>>PAGE_SHIFT);
-}
-
-/* warning: next two assume little endian */
-COMPAT_SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf,
- u32, count, u32, poslo, u32, poshi)
-{
- return ksys_pread64(fd, ubuf, count,
- ((loff_t)AA(poshi) << 32) | AA(poslo));
-}
-
-COMPAT_SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf,
- u32, count, u32, poslo, u32, poshi)
-{
- return ksys_pwrite64(fd, ubuf, count,
- ((loff_t)AA(poshi) << 32) | AA(poslo));
-}
-
-
-/*
- * Some system calls that need sign extended arguments. This could be
- * done by a generic wrapper.
- */
-COMPAT_SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low,
- __u32, offset_high, __u32, len_low, __u32, len_high,
- int, advice)
-{
- return ksys_fadvise64_64(fd,
- (((u64)offset_high)<<32) | offset_low,
- (((u64)len_high)<<32) | len_low,
- advice);
-}
-
-COMPAT_SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo,
- unsigned int, off_hi, size_t, count)
-{
- return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
-}
-
-COMPAT_SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low,
- unsigned int, off_hi, unsigned int, n_low,
- unsigned int, n_hi, int, flags)
-{
- return ksys_sync_file_range(fd,
- ((u64)off_hi << 32) | off_low,
- ((u64)n_hi << 32) | n_low, flags);
-}
-
-COMPAT_SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo,
- unsigned int, offset_hi, size_t, len, int, advice)
-{
- return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
- len, advice);
-}
-
-COMPAT_SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode,
- unsigned int, offset_lo, unsigned int, offset_hi,
- unsigned int, len_lo, unsigned int, len_hi)
-{
- return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
- ((u64)len_hi << 32) | len_lo);
-}
-
-/*
- * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
- */
-COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags,
- unsigned long, newsp, int __user *, parent_tidptr,
- unsigned long, tls_val, int __user *, child_tidptr)
-{
- struct kernel_clone_args args = {
- .flags = (clone_flags & ~CSIGNAL),
- .pidfd = parent_tidptr,
- .child_tid = child_tidptr,
- .parent_tid = parent_tidptr,
- .exit_signal = (clone_flags & CSIGNAL),
- .stack = newsp,
- .tls = tls_val,
- };
-
- if (!legacy_clone_args_valid(&args))
- return -EINVAL;
-
- return _do_fork(&args);
-}
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 9b294c1..b8f89f7 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -53,6 +53,8 @@ obj-y += setup.o x86_init.o i8259.o irqinit.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
obj-$(CONFIG_IRQ_WORK) += irq_work.o
obj-y += probe_roms.o
+obj-$(CONFIG_X86_32) += sys_ia32.o
+obj-$(CONFIG_IA32_EMULATION) += sys_ia32.o
obj-$(CONFIG_X86_64) += sys_x86_64.o
obj-$(CONFIG_X86_ESPFIX64) += espfix_64.o
obj-$(CONFIG_SYSFS) += ksysfs.o
diff --git a/arch/x86/kernel/sys_ia32.c b/arch/x86/kernel/sys_ia32.c
new file mode 100644
index 0000000..ab03fed
--- /dev/null
+++ b/arch/x86/kernel/sys_ia32.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
+ * sys_sparc32
+ *
+ * Copyright (C) 2000 VA Linux Co
+ * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
+ * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
+ * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 2000 Hewlett-Packard Co.
+ * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
+ *
+ * These routines maintain argument size conversion between 32bit and 64bit
+ * environment. In 2.5 most of this should be moved to a generic directory.
+ *
+ * This file assumes that there is a hole at the end of user address space.
+ *
+ * Some of the functions are LE specific currently. These are
+ * hopefully all marked. This should be fixed.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/signal.h>
+#include <linux/syscalls.h>
+#include <linux/times.h>
+#include <linux/utsname.h>
+#include <linux/mm.h>
+#include <linux/uio.h>
+#include <linux/poll.h>
+#include <linux/personality.h>
+#include <linux/stat.h>
+#include <linux/rwsem.h>
+#include <linux/compat.h>
+#include <linux/vfs.h>
+#include <linux/ptrace.h>
+#include <linux/highuid.h>
+#include <linux/sysctl.h>
+#include <linux/slab.h>
+#include <linux/sched/task.h>
+#include <asm/mman.h>
+#include <asm/types.h>
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+#include <asm/vgtod.h>
+#include <asm/ia32.h>
+
+#define AA(__x) ((unsigned long)(__x))
+
+SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
+ unsigned long, offset_low, unsigned long, offset_high)
+{
+ return ksys_truncate(filename,
+ ((loff_t) offset_high << 32) | offset_low);
+}
+
+SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
+ unsigned long, offset_low, unsigned long, offset_high)
+{
+ return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
+}
+
+/* warning: next two assume little endian */
+SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf,
+ u32, count, u32, poslo, u32, poshi)
+{
+ return ksys_pread64(fd, ubuf, count,
+ ((loff_t)AA(poshi) << 32) | AA(poslo));
+}
+
+SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf,
+ u32, count, u32, poslo, u32, poshi)
+{
+ return ksys_pwrite64(fd, ubuf, count,
+ ((loff_t)AA(poshi) << 32) | AA(poslo));
+}
+
+
+/*
+ * Some system calls that need sign extended arguments. This could be
+ * done by a generic wrapper.
+ */
+SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low,
+ __u32, offset_high, __u32, len_low, __u32, len_high,
+ int, advice)
+{
+ return ksys_fadvise64_64(fd,
+ (((u64)offset_high)<<32) | offset_low,
+ (((u64)len_high)<<32) | len_low,
+ advice);
+}
+
+SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo,
+ unsigned int, off_hi, size_t, count)
+{
+ return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
+}
+
+SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low,
+ unsigned int, off_hi, unsigned int, n_low,
+ unsigned int, n_hi, int, flags)
+{
+ return ksys_sync_file_range(fd,
+ ((u64)off_hi << 32) | off_low,
+ ((u64)n_hi << 32) | n_low, flags);
+}
+
+SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo,
+ unsigned int, offset_hi, size_t, len, int, advice)
+{
+ return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
+ len, advice);
+}
+
+SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode,
+ unsigned int, offset_lo, unsigned int, offset_hi,
+ unsigned int, len_lo, unsigned int, len_hi)
+{
+ return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
+ ((u64)len_hi << 32) | len_lo);
+}
+
+#ifdef CONFIG_IA32_EMULATION
+/*
+ * Another set for IA32/LFS -- x86_64 struct stat is different due to
+ * support for 64bit inode numbers.
+ */
+static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
+{
+ typeof(ubuf->st_uid) uid = 0;
+ typeof(ubuf->st_gid) gid = 0;
+ SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
+ SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
+ if (!access_ok(ubuf, sizeof(struct stat64)) ||
+ __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
+ __put_user(stat->ino, &ubuf->__st_ino) ||
+ __put_user(stat->ino, &ubuf->st_ino) ||
+ __put_user(stat->mode, &ubuf->st_mode) ||
+ __put_user(stat->nlink, &ubuf->st_nlink) ||
+ __put_user(uid, &ubuf->st_uid) ||
+ __put_user(gid, &ubuf->st_gid) ||
+ __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
+ __put_user(stat->size, &ubuf->st_size) ||
+ __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
+ __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
+ __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
+ __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
+ __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
+ __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
+ __put_user(stat->blksize, &ubuf->st_blksize) ||
+ __put_user(stat->blocks, &ubuf->st_blocks))
+ return -EFAULT;
+ return 0;
+}
+
+COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename,
+ struct stat64 __user *, statbuf)
+{
+ struct kstat stat;
+ int ret = vfs_stat(filename, &stat);
+
+ if (!ret)
+ ret = cp_stat64(statbuf, &stat);
+ return ret;
+}
+
+COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename,
+ struct stat64 __user *, statbuf)
+{
+ struct kstat stat;
+ int ret = vfs_lstat(filename, &stat);
+ if (!ret)
+ ret = cp_stat64(statbuf, &stat);
+ return ret;
+}
+
+COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd,
+ struct stat64 __user *, statbuf)
+{
+ struct kstat stat;
+ int ret = vfs_fstat(fd, &stat);
+ if (!ret)
+ ret = cp_stat64(statbuf, &stat);
+ return ret;
+}
+
+COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd,
+ const char __user *, filename,
+ struct stat64 __user *, statbuf, int, flag)
+{
+ struct kstat stat;
+ int error;
+
+ error = vfs_fstatat(dfd, filename, &stat, flag);
+ if (error)
+ return error;
+ return cp_stat64(statbuf, &stat);
+}
+
+/*
+ * Linux/i386 didn't use to be able to handle more than
+ * 4 system call parameters, so these system calls used a memory
+ * block for parameter passing..
+ */
+
+struct mmap_arg_struct32 {
+ unsigned int addr;
+ unsigned int len;
+ unsigned int prot;
+ unsigned int flags;
+ unsigned int fd;
+ unsigned int offset;
+};
+
+COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg)
+{
+ struct mmap_arg_struct32 a;
+
+ if (copy_from_user(&a, arg, sizeof(a)))
+ return -EFAULT;
+
+ if (a.offset & ~PAGE_MASK)
+ return -EINVAL;
+
+ return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
+ a.offset>>PAGE_SHIFT);
+}
+
+/*
+ * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
+ */
+COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags,
+ unsigned long, newsp, int __user *, parent_tidptr,
+ unsigned long, tls_val, int __user *, child_tidptr)
+{
+ struct kernel_clone_args args = {
+ .flags = (clone_flags & ~CSIGNAL),
+ .pidfd = parent_tidptr,
+ .child_tid = child_tidptr,
+ .parent_tid = parent_tidptr,
+ .exit_signal = (clone_flags & CSIGNAL),
+ .stack = newsp,
+ .tls = tls_val,
+ };
+
+ if (!legacy_clone_args_valid(&args))
+ return -EINVAL;
+
+ return _do_fork(&args);
+}
+#endif /* CONFIG_IA32_EMULATION */
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index 33c51c0..77f70b9 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -21,6 +21,7 @@ obj-y += checksum_32.o syscalls_32.o
obj-$(CONFIG_ELF_CORE) += elfcore.o

subarch-y = ../lib/string_32.o ../lib/atomic64_32.o ../lib/atomic64_cx8_32.o
+subarch-y += ../kernel/sys_ia32.o

else

\
 
 \ /
  Last update: 2020-03-21 16:31    [W:0.212 / U:10.408 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site