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| author | Jason Gunthorpe <jgg@nvidia.com> | 2026-03-03 22:50:01 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2026-03-08 13:20:25 +0300 |
| commit | dbf6491bb98d2821f0a23f4e8efd215cb2e5ff21 (patch) | |
| tree | 660876f9fc9d33a08204edb3f6d29b3ed6c4a16d /include | |
| parent | 1de9287ece44022bd694e669153fb7644804e10d (diff) | |
| download | linux-dbf6491bb98d2821f0a23f4e8efd215cb2e5ff21.tar.xz | |
RDMA: Add ib_copy_validate_udata_in_cm()
For structures with comp_mask also absorb the check of comp_mask valid
bits into the helper. This is slightly tricky because ~ might not fully
extend to 64 bits, the helper inserts an explicit type to ensure that ~
covers all bits.
Link: https://patch.msgid.link/r/4-v3-bd56dd443069+49-bnxt_re_uapi_jgg@nvidia.com
Tested-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Acked-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/rdma/uverbs_ioctl.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h index 505492443c36..a73016a977a1 100644 --- a/include/rdma/uverbs_ioctl.h +++ b/include/rdma/uverbs_ioctl.h @@ -1044,4 +1044,29 @@ uverbs_get_raw_fd(int *to, const struct uverbs_attr_bundle *attrs_bundle, _ib_copy_validate_udata_in(_udata, &(_req), sizeof(_req), \ offsetofend(typeof(_req), _end_member)) +int _ib_copy_validate_udata_cm_fail(struct ib_udata *udata, u64 req_cm, + u64 valid_cm); + +/** + * ib_copy_validate_udata_in_cm - Copy the req structure and check the comp_mask + * @_udata: The system calls ib_udata struct + * @_req: The name of an on-stack structure that holds the driver data + * @_end_member: The member in the struct that is the original end of struct + * from the first kernel to introduce it. + * @_valid_cm: A bitmask of bits permitted in the comp_mask_field. + * + * Check that the udata input request struct is properly formed for this kernel. + * Then copy it into req + */ +#define ib_copy_validate_udata_in_cm(_udata, _req, _end_member, _valid_cm) \ + ({ \ + typeof((_req).comp_mask) __valid_cm = _valid_cm; \ + int ret = \ + ib_copy_validate_udata_in(_udata, _req, _end_member); \ + if (!ret && ((_req).comp_mask & ~__valid_cm)) \ + ret = _ib_copy_validate_udata_cm_fail( \ + _udata, (_req).comp_mask, __valid_cm); \ + ret; \ + }) + #endif |