From: Carsten Langgaard <carstenl@mips.com>
To: Ralf Baechle <ralf@oss.sgi.com>,
"Maciej W. Rozycki" <macro@ds2.pg.gda.pl>,
linux-mips@oss.sgi.com
Subject: IPC syscall fixup (o32 conversion layer)
Date: Wed, 07 Aug 2002 16:42:15 +0200 [thread overview]
Message-ID: <3D5131C7.17F9E00@mips.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 463 bytes --]
Here is a patch that fixes the ipc syscalls in the o32
wrapper/conversion routines.
Needed when running a 64-bit kernel on an o32 userland.
/Carsten
--
_ _ ____ ___ Carsten Langgaard Mailto:carstenl@mips.com
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Denmark http://www.mips.com
[-- Attachment #2: linux32.patch --]
[-- Type: text/plain, Size: 9594 bytes --]
Index: arch/mips64/kernel/linux32.c
===================================================================
RCS file: /cvs/linux/arch/mips64/kernel/linux32.c,v
retrieving revision 1.42.2.9
diff -u -r1.42.2.9 linux32.c
--- arch/mips64/kernel/linux32.c 2002/07/23 12:26:09 1.42.2.9
+++ arch/mips64/kernel/linux32.c 2002/08/07 14:28:03
@@ -35,8 +35,16 @@
#include <asm/mman.h>
#include <asm/ipc.h>
-
+/* Use this to get at 32-bit user passed pointers. */
+/* A() macro should be used for places where you e.g.
+ have some internal variable u32 and just want to get
+ rid of a compiler warning. AA() has to be used in
+ places where you want to convert a function argument
+ to 32bit pointer or when you e.g. access pt_regs
+ structure and want to consider 32bit registers only.
+ */
#define A(__x) ((unsigned long)(__x))
+#define AA(__x) ((unsigned long)((int)__x))
#ifdef __MIPSEB__
#define merge_64(r1,r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
@@ -1494,6 +1502,19 @@
unsigned short seq;
};
+struct ipc64_perm32 {
+ key_t key;
+ __kernel_uid_t32 uid;
+ __kernel_gid_t32 gid;
+ __kernel_uid_t32 cuid;
+ __kernel_gid_t32 cgid;
+ __kernel_mode_t32 mode;
+ unsigned short seq;
+ unsigned short __pad1;
+ unsigned int __unused1;
+ unsigned int __unused2;
+};
+
struct semid_ds32 {
struct ipc_perm32 sem_perm; /* permissions .. see ipc.h */
__kernel_time_t32 sem_otime; /* last semop time */
@@ -1522,6 +1543,23 @@
__kernel_ipc_pid_t32 msg_lrpid;
};
+struct msqid64_ds32 {
+ struct ipc64_perm32 msg_perm;
+ __kernel_time_t32 msg_stime;
+ unsigned int __unused1;
+ __kernel_time_t32 msg_rtime;
+ unsigned int __unused2;
+ __kernel_time_t32 msg_ctime;
+ unsigned int __unused3;
+ unsigned int msg_cbytes;
+ unsigned int msg_qnum;
+ unsigned int msg_qbytes;
+ __kernel_pid_t32 msg_lspid;
+ __kernel_pid_t32 msg_lrpid;
+ unsigned int __unused4;
+ unsigned int __unused5;
+};
+
struct shmid_ds32 {
struct ipc_perm32 shm_perm;
int shm_segsz;
@@ -1533,9 +1571,25 @@
unsigned short shm_nattch;
};
+struct ipc_kludge32 {
+ u32 msgp;
+ s32 msgtyp;
+};
+
#define IPCOP_MASK(__x) (1UL << (__x))
static int
+ipc_parse_version32(int *cmd)
+{
+ if (*cmd & IPC_64) {
+ *cmd ^= IPC_64;
+ return IPC_64;
+ } else {
+ return IPC_OLD;
+ }
+}
+
+static int
do_sys32_semctl(int first, int second, int third, void *uptr)
{
union semun fourth;
@@ -1603,12 +1657,15 @@
static int
do_sys32_msgsnd (int first, int second, int third, void *uptr)
{
- struct msgbuf *p = kmalloc (second + sizeof (struct msgbuf)
- + 4, GFP_USER);
struct msgbuf32 *up = (struct msgbuf32 *)uptr;
+ struct msgbuf *p;
mm_segment_t old_fs;
int err;
+ if (second < 0)
+ return -EINVAL;
+ p = kmalloc (second + sizeof (struct msgbuf)
+ + 4, GFP_USER);
if (!p)
return -ENOMEM;
err = get_user (p->mtype, &up->mtype);
@@ -1636,18 +1693,21 @@
int err;
if (!version) {
- struct ipc_kludge *uipck = (struct ipc_kludge *)uptr;
- struct ipc_kludge ipck;
+ struct ipc_kludge32 *uipck = (struct ipc_kludge32 *)uptr;
+ struct ipc_kludge32 ipck;
err = -EINVAL;
if (!uptr)
goto out;
err = -EFAULT;
- if (copy_from_user (&ipck, uipck, sizeof (struct ipc_kludge)))
+ if (copy_from_user (&ipck, uipck, sizeof (struct ipc_kludge32)))
goto out;
- uptr = (void *)A(ipck.msgp);
+ uptr = (void *)AA(ipck.msgp);
msgtyp = ipck.msgtyp;
}
+
+ if (second < 0)
+ return -EINVAL;
err = -ENOMEM;
p = kmalloc (second + sizeof (struct msgbuf) + 4, GFP_USER);
if (!p)
@@ -1673,9 +1733,10 @@
{
int err = -EINVAL, err2;
struct msqid_ds m;
- struct msqid64_ds m64;
- struct msqid_ds32 *up = (struct msqid_ds32 *)uptr;
+ struct msqid_ds32 *up32 = (struct msqid_ds32 *)uptr;
+ struct msqid64_ds32 *up64 = (struct msqid64_ds32 *)uptr;
mm_segment_t old_fs;
+ int version = ipc_parse_version32(&second);
switch (second) {
@@ -1686,10 +1747,25 @@
break;
case IPC_SET:
- err = get_user (m.msg_perm.uid, &up->msg_perm.uid);
- err |= __get_user (m.msg_perm.gid, &up->msg_perm.gid);
- err |= __get_user (m.msg_perm.mode, &up->msg_perm.mode);
- err |= __get_user (m.msg_qbytes, &up->msg_qbytes);
+ if (version == IPC_64) {
+ if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) {
+ err = -EFAULT;
+ break;
+ }
+ err = __get_user(m.msg_perm.uid, &up64->msg_perm.uid);
+ err |= __get_user(m.msg_perm.gid, &up64->msg_perm.gid);
+ err |= __get_user(m.msg_perm.mode, &up64->msg_perm.mode);
+ err |= __get_user(m.msg_qbytes, &up64->msg_qbytes);
+ } else {
+ if (!access_ok(VERIFY_READ, up32, sizeof(*up32))) {
+ err = -EFAULT;
+ break;
+ }
+ err = __get_user(m.msg_perm.uid, &up32->msg_perm.uid);
+ err |= __get_user(m.msg_perm.gid, &up32->msg_perm.gid);
+ err |= __get_user(m.msg_perm.mode, &up32->msg_perm.mode);
+ err |= __get_user(m.msg_qbytes, &up32->msg_qbytes);
+ }
if (err)
break;
old_fs = get_fs ();
@@ -1702,27 +1778,54 @@
case MSG_STAT:
old_fs = get_fs ();
set_fs (KERNEL_DS);
- err = sys_msgctl (first, second, (void *) &m64);
+ err = sys_msgctl (first, second, &m);
set_fs (old_fs);
- err2 = put_user (m64.msg_perm.key, &up->msg_perm.key);
- err2 |= __put_user(m64.msg_perm.uid, &up->msg_perm.uid);
- err2 |= __put_user(m64.msg_perm.gid, &up->msg_perm.gid);
- err2 |= __put_user(m64.msg_perm.cuid, &up->msg_perm.cuid);
- err2 |= __put_user(m64.msg_perm.cgid, &up->msg_perm.cgid);
- err2 |= __put_user(m64.msg_perm.mode, &up->msg_perm.mode);
- err2 |= __put_user(m64.msg_perm.seq, &up->msg_perm.seq);
- err2 |= __put_user(m64.msg_stime, &up->msg_stime);
- err2 |= __put_user(m64.msg_rtime, &up->msg_rtime);
- err2 |= __put_user(m64.msg_ctime, &up->msg_ctime);
- err2 |= __put_user(m64.msg_cbytes, &up->msg_cbytes);
- err2 |= __put_user(m64.msg_qnum, &up->msg_qnum);
- err2 |= __put_user(m64.msg_qbytes, &up->msg_qbytes);
- err2 |= __put_user(m64.msg_lspid, &up->msg_lspid);
- err2 |= __put_user(m64.msg_lrpid, &up->msg_lrpid);
- if (err2)
- err = -EFAULT;
+ if (version == IPC_64) {
+ if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) {
+ err = -EFAULT;
+ break;
+ }
+ err2 = __put_user(m.msg_perm.key, &up64->msg_perm.key);
+ err2 |= __put_user(m.msg_perm.uid, &up64->msg_perm.uid);
+ err2 |= __put_user(m.msg_perm.gid, &up64->msg_perm.gid);
+ err2 |= __put_user(m.msg_perm.cuid, &up64->msg_perm.cuid);
+ err2 |= __put_user(m.msg_perm.cgid, &up64->msg_perm.cgid);
+ err2 |= __put_user(m.msg_perm.mode, &up64->msg_perm.mode);
+ err2 |= __put_user(m.msg_perm.seq, &up64->msg_perm.seq);
+ err2 |= __put_user(m.msg_stime, &up64->msg_stime);
+ err2 |= __put_user(m.msg_rtime, &up64->msg_rtime);
+ err2 |= __put_user(m.msg_ctime, &up64->msg_ctime);
+ err2 |= __put_user(m.msg_cbytes, &up64->msg_cbytes);
+ err2 |= __put_user(m.msg_qnum, &up64->msg_qnum);
+ err2 |= __put_user(m.msg_qbytes, &up64->msg_qbytes);
+ err2 |= __put_user(m.msg_lspid, &up64->msg_lspid);
+ err2 |= __put_user(m.msg_lrpid, &up64->msg_lrpid);
+ if (err2)
+ err = -EFAULT;
+ } else {
+ if (!access_ok(VERIFY_WRITE, up32, sizeof(*up32))) {
+ err = -EFAULT;
+ break;
+ }
+ err2 = __put_user(m.msg_perm.key, &up32->msg_perm.key);
+ err2 |= __put_user(m.msg_perm.uid, &up32->msg_perm.uid);
+ err2 |= __put_user(m.msg_perm.gid, &up32->msg_perm.gid);
+ err2 |= __put_user(m.msg_perm.cuid, &up32->msg_perm.cuid);
+ err2 |= __put_user(m.msg_perm.cgid, &up32->msg_perm.cgid);
+ err2 |= __put_user(m.msg_perm.mode, &up32->msg_perm.mode);
+ err2 |= __put_user(m.msg_perm.seq, &up32->msg_perm.seq);
+ err2 |= __put_user(m.msg_stime, &up32->msg_stime);
+ err2 |= __put_user(m.msg_rtime, &up32->msg_rtime);
+ err2 |= __put_user(m.msg_ctime, &up32->msg_ctime);
+ err2 |= __put_user(m.msg_cbytes, &up32->msg_cbytes);
+ err2 |= __put_user(m.msg_qnum, &up32->msg_qnum);
+ err2 |= __put_user(m.msg_qbytes, &up32->msg_qbytes);
+ err2 |= __put_user(m.msg_lspid, &up32->msg_lspid);
+ err2 |= __put_user(m.msg_lrpid, &up32->msg_lrpid);
+ if (err2)
+ err = -EFAULT;
+ }
break;
-
}
return err;
@@ -1845,7 +1948,7 @@
case SEMOP:
/* struct sembuf is the same on 32 and 64bit :)) */
- err = sys_semop (first, (struct sembuf *)A(ptr),
+ err = sys_semop (first, (struct sembuf *)AA(ptr),
second);
break;
case SEMGET:
@@ -1853,36 +1956,36 @@
break;
case SEMCTL:
err = do_sys32_semctl (first, second, third,
- (void *)A(ptr));
+ (void *)AA(ptr));
break;
case MSGSND:
err = do_sys32_msgsnd (first, second, third,
- (void *)A(ptr));
+ (void *)AA(ptr));
break;
case MSGRCV:
err = do_sys32_msgrcv (first, second, fifth, third,
- version, (void *)A(ptr));
+ version, (void *)AA(ptr));
break;
case MSGGET:
err = sys_msgget ((key_t) first, second);
break;
case MSGCTL:
- err = do_sys32_msgctl (first, second, (void *)A(ptr));
+ err = do_sys32_msgctl (first, second, (void *)AA(ptr));
break;
case SHMAT:
err = do_sys32_shmat (first, second, third,
- version, (void *)A(ptr));
+ version, (void *)AA(ptr));
break;
case SHMDT:
- err = sys_shmdt ((char *)A(ptr));
+ err = sys_shmdt ((char *)AA(ptr));
break;
case SHMGET:
err = sys_shmget (first, second, third);
break;
case SHMCTL:
- err = do_sys32_shmctl (first, second, (void *)A(ptr));
+ err = do_sys32_shmctl (first, second, (void *)AA(ptr));
break;
default:
err = -EINVAL;
next reply other threads:[~2002-08-07 14:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-07 14:42 Carsten Langgaard [this message]
2002-08-07 14:58 ` IPC syscall fixup (o32 conversion layer) Maciej W. Rozycki
2002-08-07 15:13 ` Ralf Baechle
2002-08-07 15:24 ` Maciej W. Rozycki
2002-08-08 6:57 ` Carsten Langgaard
2002-08-13 3:23 ` Ralf Baechle
2002-08-19 13:49 ` Carsten Langgaard
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