Greg just recently replied to a similar patch rejecting it. I don't have his response handy, but I bet you can find it in the archives. Briefly, this hides possible errors rather than fixing them.
________________________________________
From: lustre-devel [lustre-devel-bounces@xxxxxxxxxxxxxxxx] on behalf of Wim de With [nauxuron@xxxxxxxxxxxxx]
Sent: Tuesday, December 08, 2015 2:34 PM
To: oleg.drokin@xxxxxxxxx; andreas.dilger@xxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx
Cc: devel@xxxxxxxxxxxxxxxxxxxx; Wim de With; linux-kernel@xxxxxxxxxxxxxxx; lustre-devel@xxxxxxxxxxxxxxxx
Subject: [lustre-devel] [PATCH] staging: lustre: add __user attributes to llite/file.c
This fixes the following sparse warnings:
drivers/staging/lustre/lustre/llite/file.c:1310:38: expected void const [noderef] <asn:1>*from
drivers/staging/lustre/lustre/llite/file.c:1310:38: got struct ll_recreate_obj *<noident>
drivers/staging/lustre/lustre/llite/file.c:1328:35: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:1328:35: expected void const [noderef] <asn:1>*from
drivers/staging/lustre/lustre/llite/file.c:1328:35: got struct lu_fid *<noident>
drivers/staging/lustre/lustre/llite/file.c:1475:35: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:1475:35: expected void const [noderef] <asn:1>*from
drivers/staging/lustre/lustre/llite/file.c:1475:35: got struct lov_user_md_v1 *<noident>
drivers/staging/lustre/lustre/llite/file.c:1500:35: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:1500:35: expected void const [noderef] <asn:1>*from
drivers/staging/lustre/lustre/llite/file.c:1500:35: got struct lov_user_md_v1 *lumv1p
drivers/staging/lustre/lustre/llite/file.c:1505:44: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:1505:44: expected void const [noderef] <asn:1>*from
drivers/staging/lustre/lustre/llite/file.c:1505:44: got struct lov_user_md_v3 *lumv3p
drivers/staging/lustre/lustre/llite/file.c:1516:17: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:1516:17: expected void const volatile [noderef] <asn:1>*<noident>
drivers/staging/lustre/lustre/llite/file.c:1516:17: got unsigned short *<noident>
drivers/staging/lustre/lustre/llite/file.c:1829:27: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:1829:27: expected void [noderef] <asn:1>*to
drivers/staging/lustre/lustre/llite/file.c:1829:27: got void *<noident>
drivers/staging/lustre/lustre/llite/file.c:2214:24: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2214:24: expected void const volatile [noderef] <asn:1>*<noident>
drivers/staging/lustre/lustre/llite/file.c:2214:24: got int *<noident>
drivers/staging/lustre/lustre/llite/file.c:2221:21: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2221:21: expected void const volatile [noderef] <asn:1>*<noident>
drivers/staging/lustre/lustre/llite/file.c:2221:21: got int *<noident>
drivers/staging/lustre/lustre/llite/file.c:2245:43: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2245:43: expected void const [noderef] <asn:1>*from
drivers/staging/lustre/lustre/llite/file.c:2245:43: got char *<noident>
drivers/staging/lustre/lustre/llite/file.c:2275:24: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2275:24: expected void const volatile [noderef] <asn:1>*<noident>
drivers/staging/lustre/lustre/llite/file.c:2275:24: got int *<noident>
drivers/staging/lustre/lustre/llite/file.c:2292:35: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2292:35: expected void [noderef] <asn:1>*to
drivers/staging/lustre/lustre/llite/file.c:2292:35: got void *<noident>
drivers/staging/lustre/lustre/llite/file.c:2299:44: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2299:44: expected void [noderef] <asn:1>*arg
drivers/staging/lustre/lustre/llite/file.c:2299:44: got void *<noident>
drivers/staging/lustre/lustre/llite/file.c:2304:43: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2304:43: expected void const [noderef] <asn:1>*from
drivers/staging/lustre/lustre/llite/file.c:2304:43: got char *<noident>
drivers/staging/lustre/lustre/llite/file.c:2310:46: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2310:46: expected void [noderef] <asn:1>*to
drivers/staging/lustre/lustre/llite/file.c:2310:46: got char *<noident>
drivers/staging/lustre/lustre/llite/file.c:2323:21: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2323:21: expected void const volatile [noderef] <asn:1>*<noident>
drivers/staging/lustre/lustre/llite/file.c:2323:21: got int *<noident>
drivers/staging/lustre/lustre/llite/file.c:2350:35: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2350:35: expected void [noderef] <asn:1>*to
drivers/staging/lustre/lustre/llite/file.c:2350:35: got void *<noident>
drivers/staging/lustre/lustre/llite/file.c:2361:36: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2361:36: expected void const [noderef] <asn:1>*<noident>
drivers/staging/lustre/lustre/llite/file.c:2361:36: got char *<noident>
drivers/staging/lustre/lustre/llite/file.c:2389:35: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2389:35: expected void [noderef] <asn:1>*to
drivers/staging/lustre/lustre/llite/file.c:2389:35: got char *<noident>
drivers/staging/lustre/lustre/llite/file.c:2483:36: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/lustre/lustre/llite/file.c:2483:36: expected void const [noderef] <asn:1>*<noident>
drivers/staging/lustre/lustre/llite/file.c:2483:36: got void *<noident>
It simply casts pointers to __user pointers in most cases, and changes a
few pointers to __user pointers.
Signed-off-by: Wim de With <nauxuron@xxxxxxxxxxxxx>
---
drivers/staging/lustre/lustre/llite/file.c | 43 ++++++++++++++++--------------
1 file changed, 23 insertions(+), 20 deletions(-)
diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index 02f2759..27fc7af 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -1307,7 +1307,7 @@ static int ll_lov_recreate_obj(struct inode *inode, unsigned long arg)
if (!capable(CFS_CAP_SYS_ADMIN))
return -EPERM;
- if (copy_from_user(&ucreat, (struct ll_recreate_obj *)arg,
+ if (copy_from_user(&ucreat, (struct ll_recreate_obj __user *)arg,
sizeof(ucreat)))
return -EFAULT;
@@ -1325,7 +1325,7 @@ static int ll_lov_recreate_fid(struct inode *inode, unsigned long arg)
if (!capable(CFS_CAP_SYS_ADMIN))
return -EPERM;
- if (copy_from_user(&fid, (struct lu_fid *)arg, sizeof(fid)))
+ if (copy_from_user(&fid, (struct lu_fid __user *)arg, sizeof(fid)))
return -EFAULT;
fid_to_ostid(&fid, &oi);
@@ -1472,7 +1472,7 @@ static int ll_lov_setea(struct inode *inode, struct file *file,
if (lump == NULL)
return -ENOMEM;
- if (copy_from_user(lump, (struct lov_user_md *)arg, lum_size)) {
+ if (copy_from_user(lump, (struct lov_user_md __user *)arg, lum_size)) {
kvfree(lump);
return -EFAULT;
}
@@ -1490,8 +1490,10 @@ static int ll_lov_setstripe(struct inode *inode, struct file *file,
{
struct lov_user_md_v3 lumv3;
struct lov_user_md_v1 *lumv1 = (struct lov_user_md_v1 *)&lumv3;
- struct lov_user_md_v1 *lumv1p = (struct lov_user_md_v1 *)arg;
- struct lov_user_md_v3 *lumv3p = (struct lov_user_md_v3 *)arg;
+ struct lov_user_md_v1 __user *lumv1p =
+ (struct lov_user_md_v1 __user *)arg;
+ struct lov_user_md_v3 __user *lumv3p =
+ (struct lov_user_md_v3 __user *)arg;
int lum_size, rc;
int flags = FMODE_WRITE;
@@ -1826,7 +1828,7 @@ static int ll_ioctl_fiemap(struct inode *inode, unsigned long arg)
ret_bytes += (fiemap_s->fm_mapped_extents *
sizeof(struct ll_fiemap_extent));
- if (copy_to_user((void *)arg, fiemap_s, ret_bytes))
+ if (copy_to_user((void __user *)arg, fiemap_s, ret_bytes))
rc = -EFAULT;
error:
@@ -2211,14 +2213,14 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
switch (cmd) {
case LL_IOC_GETFLAGS:
/* Get the current value of the file flags */
- return put_user(fd->fd_flags, (int *)arg);
+ return put_user(fd->fd_flags, (int __user *)arg);
case LL_IOC_SETFLAGS:
case LL_IOC_CLRFLAGS:
/* Set or clear specific file flags */
/* XXX This probably needs checks to ensure the flags are
* not abused, and to handle any flag side effects.
*/
- if (get_user(flags, (int *) arg))
+ if (get_user(flags, (int __user *)arg))
return -EFAULT;
if (cmd == LL_IOC_SETFLAGS) {
@@ -2242,8 +2244,8 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
struct file *file2;
struct lustre_swap_layouts lsl;
- if (copy_from_user(&lsl, (char *)arg,
- sizeof(struct lustre_swap_layouts)))
+ if (copy_from_user(&lsl, (char __user *)arg,
+ sizeof(struct lustre_swap_layouts)))
return -EFAULT;
if ((file->f_flags & O_ACCMODE) == 0) /* O_RDONLY */
@@ -2272,7 +2274,7 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return ll_iocontrol(inode, file, cmd, arg);
case FSFILT_IOC_GETVERSION_OLD:
case FSFILT_IOC_GETVERSION:
- return put_user(inode->i_generation, (int *)arg);
+ return put_user(inode->i_generation, (int __user *)arg);
case LL_IOC_GROUP_LOCK:
return ll_get_grouplock(inode, file, arg);
case LL_IOC_GROUP_UNLOCK:
@@ -2289,25 +2291,26 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case LL_IOC_FLUSHCTX:
return ll_flush_ctx(inode);
case LL_IOC_PATH2FID: {
- if (copy_to_user((void *)arg, ll_inode2fid(inode),
+ if (copy_to_user((void __user *)arg, ll_inode2fid(inode),
sizeof(struct lu_fid)))
return -EFAULT;
return 0;
}
case OBD_IOC_FID2PATH:
- return ll_fid2path(inode, (void *)arg);
+ return ll_fid2path(inode, (void __user *)arg);
case LL_IOC_DATA_VERSION: {
struct ioc_data_version idv;
int rc;
- if (copy_from_user(&idv, (char *)arg, sizeof(idv)))
+ if (copy_from_user(&idv, (char __user *)arg, sizeof(idv)))
return -EFAULT;
rc = ll_data_version(inode, &idv.idv_version,
!(idv.idv_flags & LL_DV_NOFLUSH));
- if (rc == 0 && copy_to_user((char *) arg, &idv, sizeof(idv)))
+ if (rc == 0 && copy_to_user((char __user *)arg, &idv,
+ sizeof(idv)))
return -EFAULT;
return rc;
@@ -2320,7 +2323,7 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (mdtidx < 0)
return mdtidx;
- if (put_user((int)mdtidx, (int *)arg))
+ if (put_user((int)mdtidx, (int __user *)arg))
return -EFAULT;
return 0;
@@ -2347,7 +2350,7 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
rc = obd_iocontrol(cmd, ll_i2mdexp(inode), sizeof(*op_data),
op_data, NULL);
- if (copy_to_user((void *)arg, hus, sizeof(*hus)))
+ if (copy_to_user((void __user *)arg, hus, sizeof(*hus)))
rc = -EFAULT;
ll_finish_md_op_data(op_data);
@@ -2358,7 +2361,7 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
struct hsm_state_set *hss;
int rc;
- hss = memdup_user((char *)arg, sizeof(*hss));
+ hss = memdup_user((char __user *)arg, sizeof(*hss));
if (IS_ERR(hss))
return PTR_ERR(hss);
@@ -2386,7 +2389,7 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
rc = obd_iocontrol(cmd, ll_i2mdexp(inode), sizeof(*op_data),
op_data, NULL);
- if (copy_to_user((char *)arg, hca, sizeof(*hca)))
+ if (copy_to_user((char __user *)arg, hca, sizeof(*hca)))
rc = -EFAULT;
ll_finish_md_op_data(op_data);
@@ -2480,7 +2483,7 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case LL_IOC_HSM_IMPORT: {
struct hsm_user_import *hui;
- hui = memdup_user((void *)arg, sizeof(*hui));
+ hui = memdup_user((void __user *)arg, sizeof(*hui));
if (IS_ERR(hui))
return PTR_ERR(hui);
--
2.6.3
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