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improve sys_newuname() for compat architectures 

On an architecture that supports 32-bit compat we need to override the
reported machine in uname with the 32-bit value.  Instead of doing this
separately in every architecture introduce a COMPAT_UTS_MACHINE define in
<asm/compat.h> and apply it directly in sys_newuname().

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2010-03-10 15:21:19 -08:00 committed by Linus Torvalds
parent baed7fc9b5
commit e28cbf2293
28 changed files with 36 additions and 123 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/ia64/include/asm/compat.h
View File

@ -5,7 +5,8 @@
*/
#include <linux/types.h>
#define COMPAT_USER_HZ 100
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "i686\0\0\0"
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;

3
arch/mips/include/asm/compat.h
View File

@ -8,7 +8,8 @@
#include <asm/page.h>
#include <asm/ptrace.h>
#define COMPAT_USER_HZ 100
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "mips\0\0\0"
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;

16
arch/mips/kernel/linux32.c
View File

@ -249,22 +249,6 @@ SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
}
#endif
SYSCALL_DEFINE1(32_newuname, struct new_utsname __user *, name)
{
int ret = 0;
down_read(&uts_sem);
if (copy_to_user(name, utsname(), sizeof *name))
ret = -EFAULT;
up_read(&uts_sem);
if (current->personality == PER_LINUX32 && !ret)
if (copy_to_user(name->machine, "mips\0\0\0", 8))
ret = -EFAULT;
return ret;
}
SYSCALL_DEFINE1(32_personality, unsigned long, personality)
{
int ret;

2
arch/mips/kernel/scall64-n32.S
View File

@ -181,7 +181,7 @@ EXPORT(sysn32_call_table)
PTR sys_exit
PTR compat_sys_wait4
PTR sys_kill /* 6060 */
PTR sys_32_newuname
PTR sys_newuname
PTR sys_semget
PTR sys_semop
PTR sys_n32_semctl

2
arch/mips/kernel/scall64-o32.S
View File

@ -325,7 +325,7 @@ sys_call_table:
PTR sys32_sigreturn
PTR sys32_clone /* 4120 */
PTR sys_setdomainname
PTR sys_32_newuname
PTR sys_newuname
PTR sys_ni_syscall /* sys_modify_ldt */
PTR compat_sys_adjtimex
PTR sys_mprotect /* 4125 */

3
arch/parisc/include/asm/compat.h
View File

@ -7,7 +7,8 @@
#include <linux/sched.h>
#include <linux/thread_info.h>
#define COMPAT_USER_HZ 100
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "parisc\0\0"
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;

15
arch/parisc/kernel/sys_parisc.c
View File

@ -234,18 +234,3 @@ long parisc_personality(unsigned long personality)
return err;
}
long parisc_newuname(struct new_utsname __user *name)
{
int err = sys_newuname(name);
#ifdef CONFIG_COMPAT
if (!err && personality(current->personality) == PER_LINUX32) {
if (__put_user(0, name->machine + 6) ||
__put_user(0, name->machine + 7))
err = -EFAULT;
}
#endif
return err;
}

2
arch/parisc/kernel/syscall_table.S
View File

@ -127,7 +127,7 @@
ENTRY_SAME(socketpair)
ENTRY_SAME(setpgid)
ENTRY_SAME(send)
ENTRY_OURS(newuname)
ENTRY_SAME(newuname)
ENTRY_SAME(umask) /* 60 */
ENTRY_SAME(chroot)
ENTRY_COMP(ustat)

3
arch/powerpc/include/asm/compat.h
View File

@ -7,7 +7,8 @@
#include <linux/types.h>
#include <linux/sched.h>
#define COMPAT_USER_HZ 100
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "ppc\0\0"
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;

2
arch/powerpc/include/asm/syscalls.h
View File

@ -7,7 +7,6 @@
#include <linux/types.h>
#include <asm/signal.h>
struct new_utsname;
struct pt_regs;
struct rtas_args;
struct sigaction;
@ -38,7 +37,6 @@ asmlinkage long sys_rt_sigaction(int sig,
asmlinkage long ppc64_personality(unsigned long personality);
asmlinkage int ppc_rtas(struct rtas_args __user *uargs);
asmlinkage time_t sys64_time(time_t __user * tloc);
asmlinkage long ppc_newuname(struct new_utsname __user * name);
asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset,
size_t sigsetsize);

2
arch/powerpc/include/asm/systbl.h
View File

@ -125,7 +125,7 @@ SYSCALL_SPU(fsync)
SYS32ONLY(sigreturn)
PPC_SYS(clone)
COMPAT_SYS_SPU(setdomainname)
PPC_SYS_SPU(newuname)
SYSCALL_SPU(newuname)
SYSCALL(ni_syscall)
COMPAT_SYS_SPU(adjtimex)
SYSCALL_SPU(mprotect)

13
arch/powerpc/kernel/syscalls.c
View File

@ -132,19 +132,6 @@ static inline int override_machine(char __user *mach)
return 0;
}
long ppc_newuname(struct new_utsname __user * name)
{
int err = 0;
down_read(&uts_sem);
if (copy_to_user(name, utsname(), sizeof(*name)))
err = -EFAULT;
up_read(&uts_sem);
if (!err)
err = override_machine(name->machine);
return err;
}
int sys_uname(struct old_utsname __user *name)
{
int err = 0;

3
arch/s390/include/asm/compat.h
View File

@ -35,7 +35,8 @@
extern long psw32_user_bits;
#define COMPAT_USER_HZ 100
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "s390\0\0\0\0"
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;

2
arch/s390/kernel/compat_wrapper.S
View File

@ -547,7 +547,7 @@ sys32_setdomainname_wrapper:
.globl sys32_newuname_wrapper
sys32_newuname_wrapper:
llgtr %r2,%r2 # struct new_utsname *
jg sys_s390_newuname # branch to system call
jg sys_newuname # branch to system call
.globl compat_sys_adjtimex_wrapper
compat_sys_adjtimex_wrapper:

2
arch/s390/kernel/entry.h
View File

@ -24,7 +24,6 @@ int __cpuinit start_secondary(void *cpuvoid);
void __init startup_init(void);
void die(const char * str, struct pt_regs * regs, long err);
struct new_utsname;
struct s390_mmap_arg_struct;
struct fadvise64_64_args;
struct old_sigaction;
@ -32,7 +31,6 @@ struct old_sigaction;
long sys_mmap2(struct s390_mmap_arg_struct __user *arg);
long sys_s390_ipc(uint call, int first, unsigned long second,
unsigned long third, void __user *ptr);
long sys_s390_newuname(struct new_utsname __user *name);
long sys_s390_personality(unsigned long personality);
long sys_s390_fadvise64(int fd, u32 offset_high, u32 offset_low,
size_t len, int advice);

11
arch/s390/kernel/sys_s390.c
View File

@ -131,17 +131,6 @@ SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
}
#ifdef CONFIG_64BIT
SYSCALL_DEFINE1(s390_newuname, struct new_utsname __user *, name)
{
int ret = sys_newuname(name);
if (personality(current->personality) == PER_LINUX32 && !ret) {
ret = copy_to_user(name->machine, "s390\0\0\0\0", 8);
if (ret) ret = -EFAULT;
}
return ret;
}
SYSCALL_DEFINE1(s390_personality, unsigned long, personality)
{
int ret;

2
arch/s390/kernel/syscalls.S
View File

@ -130,7 +130,7 @@ SYSCALL(sys_fsync,sys_fsync,sys32_fsync_wrapper)
SYSCALL(sys_sigreturn,sys_sigreturn,sys32_sigreturn)
SYSCALL(sys_clone,sys_clone,sys_clone_wrapper) /* 120 */
SYSCALL(sys_setdomainname,sys_setdomainname,sys32_setdomainname_wrapper)
SYSCALL(sys_newuname,sys_s390_newuname,sys32_newuname_wrapper)
SYSCALL(sys_newuname,sys_newuname,sys32_newuname_wrapper)
NI_SYSCALL /* modify_ldt for i386 */
SYSCALL(sys_adjtimex,sys_adjtimex,compat_sys_adjtimex_wrapper)
SYSCALL(sys_mprotect,sys_mprotect,sys32_mprotect_wrapper) /* 125 */

3
arch/sparc/include/asm/compat.h
View File

@ -5,7 +5,8 @@
*/
#include <linux/types.h>
#define COMPAT_USER_HZ 100
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "sparc\0\0"
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;

11
arch/sparc/kernel/sys_sparc_64.c
View File

@ -510,17 +510,6 @@ out:
return err;
}
SYSCALL_DEFINE1(sparc64_newuname, struct new_utsname __user *, name)
{
int ret = sys_newuname(name);
if (current->personality == PER_LINUX32 && !ret) {
ret = (copy_to_user(name->machine, "sparc\0\0", 8)
? -EFAULT : 0);
}
return ret;
}
SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
{
int ret;

3
arch/sparc/kernel/systbls.h
View File

@ -6,15 +6,12 @@
#include <asm/utrap.h>
#include <asm/signal.h>
struct new_utsname;
extern asmlinkage unsigned long sys_getpagesize(void);
extern asmlinkage long sparc_pipe(struct pt_regs *regs);
extern asmlinkage long sys_sparc_ipc(unsigned int call, int first,
unsigned long second,
unsigned long third,
void __user *ptr, long fifth);
extern asmlinkage long sparc64_newuname(struct new_utsname __user *name);
extern asmlinkage long sparc64_personality(unsigned long personality);
extern asmlinkage long sys64_munmap(unsigned long addr, size_t len);
extern asmlinkage unsigned long sys64_mremap(unsigned long addr,

4
arch/sparc/kernel/systbls_64.S
View File

@ -55,7 +55,7 @@ sys_call_table32:
/*170*/ .word sys32_lsetxattr, sys32_fsetxattr, sys_getxattr, sys_lgetxattr, compat_sys_getdents
.word sys_setsid, sys_fchdir, sys32_fgetxattr, sys_listxattr, sys_llistxattr
/*180*/ .word sys32_flistxattr, sys_removexattr, sys_lremovexattr, compat_sys_sigpending, sys_ni_syscall
.word sys32_setpgid, sys32_fremovexattr, sys32_tkill, sys32_exit_group, sys_sparc64_newuname
.word sys32_setpgid, sys32_fremovexattr, sys32_tkill, sys32_exit_group, sys_newuname
/*190*/ .word sys32_init_module, sys_sparc64_personality, sys_remap_file_pages, sys32_epoll_create, sys32_epoll_ctl
.word sys32_epoll_wait, sys32_ioprio_set, sys_getppid, sys32_sigaction, sys_sgetmask
/*200*/ .word sys32_ssetmask, sys_sigsuspend, compat_sys_newlstat, sys_uselib, compat_sys_old_readdir
@ -130,7 +130,7 @@ sys_call_table:
/*170*/ .word sys_lsetxattr, sys_fsetxattr, sys_getxattr, sys_lgetxattr, sys_getdents
.word sys_setsid, sys_fchdir, sys_fgetxattr, sys_listxattr, sys_llistxattr
/*180*/ .word sys_flistxattr, sys_removexattr, sys_lremovexattr, sys_nis_syscall, sys_ni_syscall
.word sys_setpgid, sys_fremovexattr, sys_tkill, sys_exit_group, sys_sparc64_newuname
.word sys_setpgid, sys_fremovexattr, sys_tkill, sys_exit_group, sys_newuname
/*190*/ .word sys_init_module, sys_sparc64_personality, sys_remap_file_pages, sys_epoll_create, sys_epoll_ctl
.word sys_epoll_wait, sys_ioprio_set, sys_getppid, sys_nis_syscall, sys_sgetmask
/*200*/ .word sys_ssetmask, sys_nis_syscall, sys_newlstat, sys_uselib, sys_nis_syscall

5
arch/um/sys-x86_64/syscall_table.c
View File

@ -26,11 +26,6 @@
/* On UML we call it this way ("old" means it's not mmap2) */
#define sys_mmap old_mmap
/*
* On x86-64 sys_uname is actually sys_newuname plus a compatibility trick.
* See arch/x86_64/kernel/sys_x86_64.c
*/
#define sys_uname sys_uname64
#define stub_clone sys_clone
#define stub_fork sys_fork

14
arch/um/sys-x86_64/syscalls.c
View File

@ -12,20 +12,6 @@
#include "asm/uaccess.h"
#include "os.h"
asmlinkage long sys_uname64(struct new_utsname __user * name)
{
int err;
down_read(&uts_sem);
err = copy_to_user(name, utsname(), sizeof (*name));
up_read(&uts_sem);
if (personality(current->personality) == PER_LINUX32)
err |= copy_to_user(&name->machine, "i686", 5);
return err ? -EFAULT : 0;
}
long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
{
unsigned long *ptr = addr, tmp;

3
arch/x86/include/asm/compat.h
View File

@ -8,7 +8,8 @@
#include <linux/sched.h>
#include <asm/user32.h>
#define COMPAT_USER_HZ 100
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "i686\0\0"
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;

3
arch/x86/include/asm/syscalls.h
View File

@ -68,11 +68,8 @@ int sys_vm86(unsigned long, unsigned long, struct pt_regs *);
long sys_arch_prctl(int, unsigned long);
/* kernel/sys_x86_64.c */
struct new_utsname;
asmlinkage long sys_mmap(unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long, unsigned long);
asmlinkage long sys_uname(struct new_utsname __user *);
#endif /* CONFIG_X86_32 */
#endif /* _ASM_X86_SYSCALLS_H */

2
arch/x86/include/asm/unistd_64.h
View File

@ -146,7 +146,7 @@ __SYSCALL(__NR_wait4, sys_wait4)
#define __NR_kill 62
__SYSCALL(__NR_kill, sys_kill)
#define __NR_uname 63
__SYSCALL(__NR_uname, sys_uname)
__SYSCALL(__NR_uname, sys_newuname)
#define __NR_semget 64
__SYSCALL(__NR_semget, sys_semget)

12
arch/x86/kernel/sys_x86_64.c
View File

@ -209,15 +209,3 @@ bottomup:
return addr;
}
SYSCALL_DEFINE1(uname, struct new_utsname __user *, name)
{
int err;
down_read(&uts_sem);
err = copy_to_user(name, utsname(), sizeof(*name));
up_read(&uts_sem);
if (personality(current->personality) == PER_LINUX32)
err |= copy_to_user(&name->machine, "i686", 5);
return err ? -EFAULT : 0;
}

13
kernel/sys.c
View File

@ -33,6 +33,7 @@
#include <linux/task_io_accounting_ops.h>
#include <linux/seccomp.h>
#include <linux/cpu.h>
#include <linux/personality.h>
#include <linux/ptrace.h>
#include <linux/fs_struct.h>
@ -1114,6 +1115,15 @@ out:
DECLARE_RWSEM(uts_sem);
#ifdef COMPAT_UTS_MACHINE
#define override_architecture(name) \
(current->personality == PER_LINUX32 && \
copy_to_user(name->machine, COMPAT_UTS_MACHINE, \
sizeof(COMPAT_UTS_MACHINE)))
#else
#define override_architecture(name) 0
#endif
SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
{
int errno = 0;
@ -1122,6 +1132,9 @@ SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
if (copy_to_user(name, utsname(), sizeof *name))
errno = -EFAULT;
up_read(&uts_sem);
if (!errno && override_architecture(name))
errno = -EFAULT;
return errno;
}