diff options
| author | Nathaniel Clark <nathaniel.l.clark@intel.com> | 2014-08-15 12:48:06 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-08-17 09:38:42 -0700 |
| commit | 6b2eb32e697d151ebaf52f9b0304d16f63a27b43 (patch) | |
| tree | 671a6e2d977040c22d8911122c60e5ff0f84dfac | |
| parent | d41b7b74cfab08cf7a5c07fafac474af9dd51d9c (diff) | |
staging/lustre/llite: check for integer overflow in hsm user request
Check to make sure total size of request does not overflow when
calculated. Return -1 from hur_len() if it does overflow.
Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-on: http://review.whamcloud.com/10615
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4984
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/lustre/lustre/include/lustre/lustre_user.h | 23 | ||||
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/dir.c | 4 |
2 files changed, 21 insertions, 6 deletions
diff --git a/drivers/staging/lustre/lustre/include/lustre/lustre_user.h b/drivers/staging/lustre/lustre/include/lustre/lustre_user.h index a69b27a78042..4c1b3cba77ba 100644 --- a/drivers/staging/lustre/lustre/include/lustre/lustre_user.h +++ b/drivers/staging/lustre/lustre/include/lustre/lustre_user.h @@ -997,12 +997,25 @@ static inline void *hur_data(struct hsm_user_request *hur) return &(hur->hur_user_item[hur->hur_request.hr_itemcount]); } -/** Compute the current length of the provided hsm_user_request. */ -static inline int hur_len(struct hsm_user_request *hur) +/** + * Compute the current length of the provided hsm_user_request. This returns -1 + * instead of an errno because ssize_t is defined to be only [ -1, SSIZE_MAX ] + * + * return -1 on bounds check error. + */ +static inline ssize_t hur_len(struct hsm_user_request *hur) { - return offsetof(struct hsm_user_request, - hur_user_item[hur->hur_request.hr_itemcount]) + - hur->hur_request.hr_data_len; + __u64 size; + + /* can't overflow a __u64 since hr_itemcount is only __u32 */ + size = offsetof(struct hsm_user_request, hur_user_item[0]) + + (__u64)hur->hur_request.hr_itemcount * + sizeof(hur->hur_user_item[0]) + hur->hur_request.hr_data_len; + + if (size != (ssize_t)size) + return -1; + + return size; } /****** HSM RPCs to copytool *****/ diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c index efa2faf080d7..de5892c5e7d6 100644 --- a/drivers/staging/lustre/lustre/llite/dir.c +++ b/drivers/staging/lustre/lustre/llite/dir.c @@ -1787,7 +1787,7 @@ out_quotactl: return ll_fid2path(inode, (void *)arg); case LL_IOC_HSM_REQUEST: { struct hsm_user_request *hur; - int totalsize; + ssize_t totalsize; OBD_ALLOC_PTR(hur); if (hur == NULL) @@ -1802,6 +1802,8 @@ out_quotactl: /* Compute the whole struct size */ totalsize = hur_len(hur); OBD_FREE_PTR(hur); + if (totalsize < 0) + return -E2BIG; /* Final size will be more than double totalsize */ if (totalsize >= MDS_MAXREQSIZE / 3) |