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overflow: Add struct_size_t() helper

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While struct_size() is normally used in situations where the structure
type already has a pointer instance, there are places where no variable
is available. In the past, this has been worked around by using a typed
NULL first argument, but this is a bit ugly. Add a helper to do this,
and replace the handful of instances of the code pattern with it.

Instances were found with this Coccinelle script:

@struct_size_t@
identifier STRUCT, MEMBER;
expression COUNT;
@@

-       struct_size((struct STRUCT *)\(0\|NULL\),
+       struct_size_t(struct STRUCT,
                MEMBER, COUNT)

Suggested-by: Christoph Hellwig <hch@infradead.org>
Cc: Jesse Brandeburg <jesse.brandeburg@intel.com>
Cc: Tony Nguyen <anthony.l.nguyen@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: James Smart <james.smart@broadcom.com>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: HighPoint Linux Team <linux@highpoint-tech.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumit Saxena <sumit.saxena@broadcom.com>
Cc: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Cc: Don Brace <don.brace@microchip.com>
Cc: "Darrick J. Wong" <djwong@kernel.org>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Guo Xuenan <guoxuenan@huawei.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: kernel test robot <lkp@intel.com>
Cc: intel-wired-lan@lists.osuosl.org
Cc: netdev@vger.kernel.org
Cc: linux-nvme@lists.infradead.org
Cc: linux-scsi@vger.kernel.org
Cc: megaraidlinux.pdl@broadcom.com
Cc: storagedev@microchip.com
Cc: linux-xfs@vger.kernel.org
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://lore.kernel.org/r/20230522211810.never.421-kees@kernel.org
This commit is contained in:
Kees Cook 2023-05-22 14:18:13 -07:00
parent 7f09a3a09f
commit d67790ddf0
10 changed files with 40 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/net/ethernet/intel/ice/ice_ddp.h
View File

@ -185,7 +185,7 @@ struct ice_buf_hdr {
#define ICE_MAX_ENTRIES_IN_BUF(hd_sz, ent_sz) \
((ICE_PKG_BUF_SIZE - \
struct_size((struct ice_buf_hdr *)0, section_entry, 1) - (hd_sz)) / \
struct_size_t(struct ice_buf_hdr, section_entry, 1) - (hd_sz)) / \
(ent_sz))
/* ice package section IDs */
@ -297,7 +297,7 @@ struct ice_label_section {
};
#define ICE_MAX_LABELS_IN_BUF \
ICE_MAX_ENTRIES_IN_BUF(struct_size((struct ice_label_section *)0, \
ICE_MAX_ENTRIES_IN_BUF(struct_size_t(struct ice_label_section, \
label, 1) - \
sizeof(struct ice_label), \
sizeof(struct ice_label))
@ -352,7 +352,7 @@ struct ice_boost_tcam_section {
};
#define ICE_MAX_BST_TCAMS_IN_BUF \
ICE_MAX_ENTRIES_IN_BUF(struct_size((struct ice_boost_tcam_section *)0, \
ICE_MAX_ENTRIES_IN_BUF(struct_size_t(struct ice_boost_tcam_section, \
tcam, 1) - \
sizeof(struct ice_boost_tcam_entry), \
sizeof(struct ice_boost_tcam_entry))
@ -372,8 +372,7 @@ struct ice_marker_ptype_tcam_section {
};
#define ICE_MAX_MARKER_PTYPE_TCAMS_IN_BUF \
ICE_MAX_ENTRIES_IN_BUF( \
struct_size((struct ice_marker_ptype_tcam_section *)0, tcam, \
ICE_MAX_ENTRIES_IN_BUF(struct_size_t(struct ice_marker_ptype_tcam_section, tcam, \
1) - \
sizeof(struct ice_marker_ptype_tcam_entry), \
sizeof(struct ice_marker_ptype_tcam_entry))

4
drivers/nvme/host/fc.c
View File

@ -2917,7 +2917,7 @@ nvme_fc_create_io_queues(struct nvme_fc_ctrl *ctrl)
ret = nvme_alloc_io_tag_set(&ctrl->ctrl, &ctrl->tag_set,
&nvme_fc_mq_ops, 1,
struct_size((struct nvme_fcp_op_w_sgl *)NULL, priv,
struct_size_t(struct nvme_fcp_op_w_sgl, priv,
ctrl->lport->ops->fcprqst_priv_sz));
if (ret)
return ret;
@ -3536,7 +3536,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
ret = nvme_alloc_admin_tag_set(&ctrl->ctrl, &ctrl->admin_tag_set,
&nvme_fc_admin_mq_ops,
struct_size((struct nvme_fcp_op_w_sgl *)NULL, priv,
struct_size_t(struct nvme_fcp_op_w_sgl, priv,
ctrl->lport->ops->fcprqst_priv_sz));
if (ret)
goto fail_ctrl;

2
drivers/scsi/hptiop.c
View File

@ -1394,7 +1394,7 @@ static int hptiop_probe(struct pci_dev *pcidev, const struct pci_device_id *id)
host->cmd_per_lun = le32_to_cpu(iop_config.max_requests);
host->max_cmd_len = 16;
req_size = struct_size((struct hpt_iop_request_scsi_command *)0,
req_size = struct_size_t(struct hpt_iop_request_scsi_command,
sg_list, hba->max_sg_descriptors);
if ((req_size & 0x1f) != 0)
req_size = (req_size + 0x1f) & ~0x1f;

6
drivers/scsi/megaraid/megaraid_sas_base.c
View File

@ -5153,7 +5153,7 @@ static void megasas_update_ext_vd_details(struct megasas_instance *instance)
fusion->max_map_sz = ventura_map_sz;
} else {
fusion->old_map_sz =
struct_size((struct MR_FW_RAID_MAP *)0, ldSpanMap,
struct_size_t(struct MR_FW_RAID_MAP, ldSpanMap,
instance->fw_supported_vd_count);
fusion->new_map_sz = sizeof(struct MR_FW_RAID_MAP_EXT);
@ -5789,7 +5789,7 @@ megasas_setup_jbod_map(struct megasas_instance *instance)
struct fusion_context *fusion = instance->ctrl_context;
size_t pd_seq_map_sz;
pd_seq_map_sz = struct_size((struct MR_PD_CFG_SEQ_NUM_SYNC *)0, seq,
pd_seq_map_sz = struct_size_t(struct MR_PD_CFG_SEQ_NUM_SYNC, seq,
MAX_PHYSICAL_DEVICES);
instance->use_seqnum_jbod_fp =
@ -8033,7 +8033,7 @@ skip_firing_dcmds:
if (instance->adapter_type != MFI_SERIES) {
megasas_release_fusion(instance);
pd_seq_map_sz =
struct_size((struct MR_PD_CFG_SEQ_NUM_SYNC *)0,
struct_size_t(struct MR_PD_CFG_SEQ_NUM_SYNC,
seq, MAX_PHYSICAL_DEVICES);
for (i = 0; i < 2 ; i++) {
if (fusion->ld_map[i])

2
drivers/scsi/megaraid/megaraid_sas_fp.c
View File

@ -326,7 +326,7 @@ u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id)
else if (instance->supportmax256vd)
expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
else
expected_size = struct_size((struct MR_FW_RAID_MAP *)0,
expected_size = struct_size_t(struct MR_FW_RAID_MAP,
ldSpanMap,
le16_to_cpu(pDrvRaidMap->ldCount));

2
drivers/scsi/smartpqi/smartpqi_init.c
View File

@ -5015,7 +5015,7 @@ static int pqi_create_queues(struct pqi_ctrl_info *ctrl_info)
}
#define PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH \
struct_size((struct pqi_event_config *)0, descriptors, PQI_MAX_EVENT_DESCRIPTORS)
struct_size_t(struct pqi_event_config, descriptors, PQI_MAX_EVENT_DESCRIPTORS)
static int pqi_configure_events(struct pqi_ctrl_info *ctrl_info,
bool enable_events)

2
fs/xfs/libxfs/xfs_btree.h
View File

@ -301,7 +301,7 @@ struct xfs_btree_cur
static inline size_t
xfs_btree_cur_sizeof(unsigned int nlevels)
{
return struct_size((struct xfs_btree_cur *)NULL, bc_levels, nlevels);
return struct_size_t(struct xfs_btree_cur, bc_levels, nlevels);
}
/* cursor flags */

2
fs/xfs/scrub/btree.h
View File

@ -60,7 +60,7 @@ struct xchk_btree {
static inline size_t
xchk_btree_sizeof(unsigned int nlevels)
{
return struct_size((struct xchk_btree *)NULL, lastkey, nlevels - 1);
return struct_size_t(struct xchk_btree, lastkey, nlevels - 1);
}
int xchk_btree(struct xfs_scrub *sc, struct xfs_btree_cur *cur,

18
include/linux/overflow.h
View File

@ -283,7 +283,7 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend)
* @member: Name of the array member.
* @count: Number of elements in the array.
*
* Calculates size of memory needed for structure @p followed by an
* Calculates size of memory needed for structure of @p followed by an
* array of @count number of @member elements.
*
* Return: number of bytes needed or SIZE_MAX on overflow.
@ -293,4 +293,20 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend)
sizeof(*(p)) + flex_array_size(p, member, count), \
size_add(sizeof(*(p)), flex_array_size(p, member, count)))
/**
* struct_size_t() - Calculate size of structure with trailing flexible array
* @type: structure type name.
* @member: Name of the array member.
* @count: Number of elements in the array.
*
* Calculates size of memory needed for structure @type followed by an
* array of @count number of @member elements. Prefer using struct_size()
* when possible instead, to keep calculations associated with a specific
* instance variable of type @type.
*
* Return: number of bytes needed or SIZE_MAX on overflow.
*/
#define struct_size_t(type, member, count) \
struct_size((type *)NULL, member, count)
#endif /* __LINUX_OVERFLOW_H */

2
lib/overflow_kunit.c
View File

@ -649,7 +649,7 @@ struct __test_flex_array {
static void overflow_size_helpers_test(struct kunit *test)
{
/* Make sure struct_size() can be used in a constant expression. */
u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)];
u8 ce_array[struct_size_t(struct __test_flex_array, data, 55)];
struct __test_flex_array *obj;
int count = 0;
int var;