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Groups > linux.kernel > #1363090
| From | James Simmons <jsimmons@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 03/29] staging: lustre: libcfs: merge code from libcfs_ioctl into libcfs_ioctl_getdata |
| Date | 2016-03-23 00:10 +0100 |
| Message-ID | <rfDB0-310-35@gated-at.bofh.it> (permalink) |
| References | <rfDAZ-310-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Liang Zhen <liang.zhen@intel.com>
This is apart of the cleanup of libcfs_ioctl* code. In this
part some of the code in libcfs_ioctl is migrated into
libcfs_ioctl_getdata_len() which is renamed libcfs_ioctl_getdata()
Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5435
Reviewed-on: http://review.whamcloud.com/11313
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
---
.../lustre/include/linux/libcfs/libcfs_ioctl.h | 4 +-
.../lustre/lnet/libcfs/linux/linux-module.c | 23 ++++++++++++---
drivers/staging/lustre/lnet/libcfs/module.c | 28 ++-----------------
3 files changed, 23 insertions(+), 32 deletions(-)
diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h
index c71d125..9c1deae 100644
--- a/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h
+++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h
@@ -225,8 +225,8 @@ static inline bool libcfs_ioctl_is_invalid(struct libcfs_ioctl_data *data)
int libcfs_register_ioctl(struct libcfs_ioctl_handler *hand);
int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand);
-int libcfs_ioctl_getdata_len(const struct libcfs_ioctl_hdr __user *arg,
- __u32 *buf_len);
+int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr **hdr_pp,
+ const struct libcfs_ioctl_hdr __user *uparam);
int libcfs_ioctl_popdata(void __user *arg, void *buf, int size);
int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data);
diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
index ebc60ac..a326ac6 100644
--- a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
@@ -57,12 +57,13 @@ int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data)
return 0;
}
-int libcfs_ioctl_getdata_len(const struct libcfs_ioctl_hdr __user *arg,
- __u32 *len)
+int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr **hdr_pp,
+ const struct libcfs_ioctl_hdr __user *uhdr)
{
struct libcfs_ioctl_hdr hdr;
+ int err = 0;
- if (copy_from_user(&hdr, arg, sizeof(hdr)))
+ if (copy_from_user(&hdr, uhdr, sizeof(uhdr)))
return -EFAULT;
if (hdr.ioc_version != LIBCFS_IOCTL_VERSION &&
@@ -72,9 +73,21 @@ int libcfs_ioctl_getdata_len(const struct libcfs_ioctl_hdr __user *arg,
return -EINVAL;
}
- *len = hdr.ioc_len;
+ if (hdr.ioc_len > LIBCFS_IOC_DATA_MAX) {
+ CERROR("libcfs ioctl: user buffer is too large %d/%d\n",
+ hdr.ioc_len, LIBCFS_IOC_DATA_MAX);
+ return -EINVAL;
+ }
- return 0;
+ LIBCFS_ALLOC(*hdr_pp, hdr.ioc_len);
+ if (!*hdr_pp)
+ return -ENOMEM;
+
+ if (copy_from_user(*hdr_pp, uhdr, hdr.ioc_len)) {
+ LIBCFS_FREE(*hdr_pp, hdr.ioc_len);
+ err = -EFAULT;
+ }
+ return err;
}
int libcfs_ioctl_popdata(void __user *arg, void *data, int size)
diff --git a/drivers/staging/lustre/lnet/libcfs/module.c b/drivers/staging/lustre/lnet/libcfs/module.c
index 3fe2810..5a20e53 100644
--- a/drivers/staging/lustre/lnet/libcfs/module.c
+++ b/drivers/staging/lustre/lnet/libcfs/module.c
@@ -172,36 +172,14 @@ static int libcfs_ioctl(struct cfs_psdev_file *pfile, unsigned long cmd,
{
struct libcfs_ioctl_hdr *hdr;
int err = 0;
- __u32 buf_len;
- err = libcfs_ioctl_getdata_len(arg, &buf_len);
+ /* 'cmd' and permissions get checked in our arch-specific caller */
+ err = libcfs_ioctl_getdata(&hdr, arg);
if (err)
return err;
- /*
- * do a check here to restrict the size of the memory
- * to allocate to guard against DoS attacks.
- */
- if (buf_len > LIBCFS_IOC_DATA_MAX) {
- CERROR("LNET: user buffer exceeds kernel buffer\n");
- return -EINVAL;
- }
-
- LIBCFS_ALLOC_GFP(hdr, buf_len, GFP_KERNEL);
- if (!hdr)
- return -ENOMEM;
-
- /* 'cmd' and permissions get checked in our arch-specific caller */
- if (copy_from_user(hdr, arg, buf_len)) {
- CERROR("LNET ioctl: data error\n");
- err = -EFAULT;
- goto out;
- }
-
err = libcfs_ioctl_handle(pfile, cmd, arg, hdr);
-
-out:
- LIBCFS_FREE(hdr, buf_len);
+ LIBCFS_FREE(hdr, hdr->ioc_len);
return err;
}
--
1.7.1
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[PATCH 00/29] Bring libcfs ioctl handling up to date James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 29/29] staging: lustre: libcfs: return size_t for libcfs_ioctl_packlen James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 28/29] staging: lustre: libcfs: use BIT macro in linux-module.c James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 22/29] staging: lustre: libcfs: removal all userland only macros from libcfs_ioctl.h James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 18/29] staging:lustre: remove the IOC_LIBCFS_MEMHOG ioctl James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 24/29] staging: lustre: libcfs: move function declarations from libcfs_ioctl.h James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 03/29] staging: lustre: libcfs: merge code from libcfs_ioctl into libcfs_ioctl_getdata James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 23/29] staging: lustre: libcfs: migrate inline functions to source file James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 19/29] staging:lustre: remove libcfs_psdev_[open|release] James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 26/29] staging: lustre: libcfs: add uapi headers to libcfs_ioctl.h James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 14/29] staging: lustre: libcfs: remove libcfsutil.h in comment James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 25/29] staging: lustre: libcfs: make libcfs_ioctl.h readable James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 27/29] staging: lustre: libcfs: return proper bool values James Simmons <jsimmons@infradead.org> - 2016-03-23 00:10 +0100 [PATCH 08/29] staging: lustre: libcfs: invert test condition for libcfs_ioctl James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 13/29] staging: lustre: libcfs: change variable name James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 11/29] staging: lustre: lnet: make sure lnet data not greater than LIBCFS_IOC_DATA_MAX James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 04/29] staging: lustre: libcfs: merge libcfs_ioctl_handle into libcfs_ioctl James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 10/29] staging: lustre: libcfs: test if userland data is to small James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 01/29] staging: lustre: libcfs: replace LNET_MAX_IOCTL_BUF_LEN with something bigger James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 02/29] staging: lustre: libcfs: use break in switch options for libcfs_ioctl_handle James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 15/29] staging: lustre: libcfs: move libcfs_ioctl_handler stuff to libcfs.h James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 12/29] staging: lustre: simple cleanup in obd_ioctl_popdata James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 09/29] staging: lustre: libcfs: update error messages in linux-module.c James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100 [PATCH 05/29] staging: lustre: libcfs: add debugging info for libcfs_ioctl James Simmons <jsimmons@infradead.org> - 2016-03-23 00:20 +0100
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