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authorMichael Guralnik <michaelgur@mellanox.com>2018-12-09 11:58:04 +0200
committerJason Gunthorpe <jgg@mellanox.com>2018-12-20 15:18:18 -0700
commit2e8039c656224b4a21e1947f45946d32a59bae53 (patch)
tree90738b202e103845640916c727fae63559901aca /include/rdma
parentf55c3ec42a97bca408f0208ec08e3382340c7be7 (diff)
downloadlinux-2e8039c656224b4a21e1947f45946d32a59bae53.tar.bz2
IB/core: uverbs copy to struct or zero helper
Add a helper to zero fill fields before copying data to UVERBS_ATTR_STRUCT. As UVERBS_ATTR_STRUCT can be used as an extensible struct, we want to make sure that if the user supplies us with a struct that has new fields that we are not aware of, we return them zeroed to the user. This helper should be used when using UVERBS_ATTR_STRUCT for an extendable data structure and there is a need to make sure that extended members of the struct, that the kernel doesn't handle, are returned zeroed to the user. This is needed due to the fact that UVERBS_ATTR_STRUCT allows non-zero values for members after 'last' member. Signed-off-by: Michael Guralnik <michaelgur@mellanox.com> Reviewed-by: Majd Dibbiny <majd@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma')
-rw-r--r--include/rdma/uverbs_ioctl.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h
index bf07cd6336d3..27da906beea7 100644
--- a/include/rdma/uverbs_ioctl.h
+++ b/include/rdma/uverbs_ioctl.h
@@ -871,6 +871,8 @@ static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, s64 lower_bound, u64 upper_bound,
s64 *def_val);
+int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
+ size_t idx, const void *from, size_t size);
#else
static inline int
uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
@@ -906,6 +908,12 @@ _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
{
return -EINVAL;
}
+static inline int
+uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
+ size_t idx, const void *from, size_t size)
+{
+ return -EINVAL;
+}
#endif
#define uverbs_get_const(_to, _attrs_bundle, _idx) \