cciss update for 2.4.27
From: mikem
Date: Fri Jun 04 2004 - 15:17:51 EST
This patch adds a conversion function for 2 of our ioctls. It is required for the x86_64 architecture. When 32-bit user space apps make calls into the 64-bit kernel we must ensure that pointers are handled properly. Without this the pointers turn to garbage and result are unpredictable.
Please consider this patch for inclusion.
Thanks,
mikem
-------------------------------------------------------------------------------
drivers/block/cciss.c | 139 +++++++++++++++++++++++++++++++++++++++++++- include/linux/cciss_ioctl.h | 27 ++++++++
2 files changed, 165 insertions(+), 1 deletion(-)
diff -burpN lx2427-rc2.orig/drivers/block/cciss.c lx2427-rc2-ioctl/drivers/block/cciss.c
--- lx2427-rc2.orig/drivers/block/cciss.c 2004-04-14 08:05:29.000000000 -0500
+++ lx2427-rc2-ioctl/drivers/block/cciss.c 2004-06-02 15:23:02.000000000 -0500
@@ -487,6 +487,142 @@ static int cciss_release(struct inode *i
return 0;
}
+#ifdef __x86_64__
+/* for AMD 64 bit kernel compatibility with 32-bit userland ioctls */
+extern int sys_ioctl(unsigned int fd, unsigned cmd, unsigned long arg);
+
+extern int
+register_ioctl32_conversion(unsigned int cmd, int (*handler)(unsigned int,
+ unsigned int, unsigned long, struct file *));
+extern int unregister_ioctl32_conversion(unsigned int cmd);
+
+static int cciss_ioctl32_passthru(unsigned int fd, unsigned cmd, unsigned long arg, struct file *file);
+static int cciss_ioctl32_big_passthru(unsigned int fd, unsigned cmd, unsigned long arg,
+ struct file *file);
+
+typedef long (*handler type) (unsigned int, unsigned int, unsigned long,
+ struct file *);
+
+static struct ioctl32_map {
+ unsigned int cmd;
+ handler_type handler;
+ int registered;
+} cciss_ioctl32_map[] = {
+ { CCISS_GETPCIINFO, (handler_type) sys_ioctl, 0 },
+ { CCISS_GETINTINFO, (handler_type) sys_ioctl, 0 },
+ { CCISS_SETINTINFO, (handler_type) sys_ioctl, 0 },
+ { CCISS_GETNODENAME, (handler_type) sys_ioctl, 0 },
+ { CCISS_SETNODENAME, (handler_type) sys_ioctl, 0 },
+ { CCISS_GETHEARTBEAT, (handler_type) sys_ioctl, 0 },
+ { CCISS_GETBUSTYPES, (handler_type) sys_ioctl, 0 },
+ { CCISS_GETFIRMVER, (handler_type) sys_ioctl, 0 },
+ { CCISS_GETDRIVVER, (handler_type) sys_ioctl, 0 },
+ { CCISS_REVALIDVOLS, (handler_type) sys_ioctl, 0 },
+ { CCISS_PASSTHRU32, cciss_ioctl32_passthru, 0 },
+ { CCISS_DEREGDISK, (handler_type) sys_ioctl, 0 },
+ { CCISS_REGNEWDISK, (handler_type) sys_ioctl, 0 },
+ { CCISS_REGNEWD, (handler_type) sys_ioctl, 0 },
+ { CCISS_RESCANDISK, (handler_type) sys_ioctl, 0 },
+ { CCISS_GETLUNINFO, (handler_type) sys_ioctl, 0 },
+ { CCISS_BIG_PASSTHRU32, cciss_ioctl32_big_passthru, 0 },
+};
+#define NCCISS_IOCTL32_ENTRIES (sizeof(cciss_ioctl32_map) / sizeof(cciss_ioctl32_map[0]))
+static void register_cciss_ioctl32(void)
+{
+ int i, rc;
+
+ for (i=0; i < NCCISS_IOCTL32_ENTRIES; i++) {
+ rc = register_ioctl32_conversion(
+ cciss_ioctl32_map[i].cmd,
+ cciss_ioctl32_map[i].handler);
+ if (rc != 0) {
+ printk(KERN_WARNING "cciss: failed to register "
+ "32 bit compatible ioctl 0x%08x\n",
+ cciss_ioctl32_map[i].cmd);
+ cciss_ioctl32_map[i].registered = 0;
+ } else
+ cciss_ioctl32_map[i].registered = 1;
+ }
+}
+static void unregister_cciss_ioctl32(void)
+{
+ int i, rc;
+
+ for (i=0; i < NCCISS_IOCTL32_ENTRIES; i++) {
+ if (!cciss_ioctl32_map[i].registered)
+ continue;
+ rc = unregister_ioctl32_conversion(
+ cciss_ioctl32_map[i].cmd);
+ if (rc == 0) {
+ cciss_ioctl32_map[i].registered = 0;
+ continue;
+ }
+ printk(KERN_WARNING "cciss: failed to unregister "
+ "32 bit compatible ioctl 0x%08x\n",
+ cciss_ioctl32_map[i].cmd);
+ }
+}
+int cciss_ioctl32_passthru(unsigned int fd, unsigned cmd, unsigned long arg,
+ struct file *file)
+{
+ IOCTL32_Command_struct *arg32 =
+ (IOCTL32_Command_struct *) arg;
+ IOCTL_Command_struct arg64;
+ mm_segment_t old_fs;
+ int err;
+
+ err = 0;
+ err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info, sizeof(arg64.LUN_info));
+ err |= copy_from_user(&arg64.Request, &arg32->Request, sizeof(arg64.Request));
+ err |= copy_from_user(&arg64.error_info, &arg32->error_info, sizeof(arg64.error_info));
+ err |= get_user(arg64.buf_size, &arg32->buf_size);
+ err |= get_user(arg64.buf, &arg32->buf);
+ if (err)
+ return -EFAULT;
+
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ err = sys_ioctl(fd, CCISS_PASSTHRU, (unsigned long) &arg64);
+ set_fs(old_fs);
+ if (err)
+ return err;
+ err |= copy_to_user(&arg32->error_info, &arg64.error_info, sizeof(&arg32->error_info));
+ if (err)
+ return -EFAULT;
+ return err;
+}
+int cciss_ioctl32_big_passthru(unsigned int fd, unsigned cmd, unsigned long arg,
+ struct file *file)
+{
+ BIG_IOCTL32_Command_struct *arg32 =
+ (BIG_IOCTL32_Command_struct *) arg;
+ BIG_IOCTL_Command_struct arg64;
+ mm_segment_t old_fs;
+ int err;
+
+ err = 0;
+ err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info, sizeof(arg64.LUN_info));
+ err |= copy_from_user(&arg64.Request, &arg32->Request, sizeof(arg64.Request));
+ err |= copy_from_user(&arg64.error_info, &arg32->error_info, sizeof(arg64.error_info));
+ err |= get_user(arg64.buf_size, &arg32->buf_size);
+ err |= get_user(arg64.malloc_size, &arg32->malloc_size);
+ err |= get_user(arg64.buf, &arg32->buf);
+ if (err) return -EFAULT;
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ err = sys_ioctl(fd, CCISS_BIG_PASSTHRU, (unsigned long) &arg64);
+ set_fs(old_fs);
+ if (err)
+ return err;
+ err |= copy_to_user(&arg32->error_info, &arg64.error_info, sizeof(&arg32->error_info));
+ if (err)
+ return -EFAULT;
+ return err;
+}
+#else
+static inline void register_cciss_ioctl32(void) {}
+static inline void unregister_cciss_ioctl32(void) {}
+#endif
/*
* ioctl
*/
@@ -3317,7 +3453,7 @@ int __init cciss_init(void)
EXPORT_NO_SYMBOLS;
static int __init init_cciss_module(void)
{
-
+ register_cciss_ioctl32();
return cciss_init();
}
@@ -3325,6 +3461,7 @@ static void __exit cleanup_cciss_module(
{
int i;
+ unregister_cciss_ioctl32();
pci_unregister_driver(&cciss_pci_driver);
/* double check that all controller entrys have been removed */
for (i=0; i< MAX_CTLR; i++) {
diff -burpN lx2427-rc2.orig/include/linux/cciss_ioctl.h lx2427-rc2-ioctl/include/linux/cciss_ioctl.h
--- lx2427-rc2.orig/include/linux/cciss_ioctl.h 2003-06-13 09:51:38.000000000 -0500
+++ lx2427-rc2-ioctl/include/linux/cciss_ioctl.h 2004-06-02 15:23:02.000000000 -0500
@@ -208,4 +208,31 @@ typedef struct _LogvolInfo_struct{
#define CCISS_GETLUNINFO _IOR(CCISS_IOC_MAGIC, 17, LogvolInfo_struct)
#define CCISS_BIG_PASSTHRU _IOWR(CCISS_IOC_MAGIC, 18, BIG_IOCTL_Command_struct)
+#ifdef __KERNEL__
+#ifdef __x86_64__
+
+/* 32 bit compatible ioctl structs */
+typedef struct _IOCTL32_Command_struct {
+ LUNAddr_struct LUN_info;
+ RequestBlock_struct Request;
+ ErrorInfo_struct error_info;
+ WORD buf_size; /* size in bytes of the buf */
+ __u32 buf; /* 32 bit pointer to data buffer */
+} IOCTL32_Command_struct;
+
+typedef struct _BIG_IOCTL32_Command_struct {
+ LUNAddr_struct LUN_info;
+ RequestBlock_struct Request;
+ ErrorInfo_struct error_info;
+ DWORD malloc_size; /* < MAX_KMALLOC_SIZE in cciss.c */
+ DWORD buf_size; /* size in bytes of the buf */
+ /* < malloc_size * MAXSGENTRIES */
+ __u32 buf; /* 32 bit pointer to data buffer */
+} BIG_IOCTL32_Command_struct;
+
+#define CCISS_PASSTHRU32 _IOWR(CCISS_IOC_MAGIC, 11, IOCTL32_Command_struct)
+#define CCISS_BIG_PASSTHRU32 _IOWR(CCISS_IOC_MAGIC, 18, BIG_IOCTL32_Command_struct)
+
+#endif /* __x86_64__ */
+#endif /* __KERNEL__ */
#endif
-
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