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RDMA/uverbs: Avoid -Wflex-array-member-not-at-end warnings
-Wflex-array-member-not-at-end is coming in GCC-14, and we are getting
ready to enable it globally.
There are currently a couple of objects (`alloc_head` and `bundle`) in
`struct bundle_priv` that contain a couple of flexible structures:
struct bundle_priv {
/* Must be first */
struct bundle_alloc_head alloc_head;
...
/*
* Must be last. bundle ends in a flex array which overlaps
* internal_buffer.
*/
struct uverbs_attr_bundle bundle;
u64 internal_buffer[32];
};
So, in order to avoid ending up with a couple of flexible-array members
in the middle of a struct, we use the `struct_group_tagged()` helper to
separate the flexible array from the rest of the members in the flexible
structures:
struct uverbs_attr_bundle {
struct_group_tagged(uverbs_attr_bundle_hdr, hdr,
... the rest of the members
);
struct uverbs_attr attrs[];
};
With the change described above, we now declare objects of the type of
the tagged struct without embedding flexible arrays in the middle of
another struct:
struct bundle_priv {
/* Must be first */
struct bundle_alloc_head_hdr alloc_head;
...
struct uverbs_attr_bundle_hdr bundle;
u64 internal_buffer[32];
};
We also use `container_of()` whenever we need to retrieve a pointer
to the flexible structures.
Notice that the `bundle_size` computed in `uapi_compute_bundle_size()`
remains the same.
So, with these changes, fix the following warnings:
drivers/infiniband/core/uverbs_ioctl.c:45:34: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
45 | struct bundle_alloc_head alloc_head;
| ^~~~~~~~~~
drivers/infiniband/core/uverbs_ioctl.c:67:35: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
67 | struct uverbs_attr_bundle bundle;
| ^~~~~~
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/ZeIgeZ5Sb0IZTOyt@neat
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Gustavo A. R. Silva
Leon Romanovsky
parent
6ec429d588
commit
155f04366e
@ -36,13 +36,15 @@
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#include "uverbs.h"
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struct bundle_alloc_head {
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struct_group_tagged(bundle_alloc_head_hdr, hdr,
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struct bundle_alloc_head *next;
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);
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u8 data[];
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};
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struct bundle_priv {
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/* Must be first */
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struct bundle_alloc_head alloc_head;
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struct bundle_alloc_head_hdr alloc_head;
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struct bundle_alloc_head *allocated_mem;
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size_t internal_avail;
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size_t internal_used;
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@ -64,7 +66,7 @@ struct bundle_priv {
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* Must be last. bundle ends in a flex array which overlaps
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* internal_buffer.
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*/
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struct uverbs_attr_bundle bundle;
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struct uverbs_attr_bundle_hdr bundle;
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u64 internal_buffer[32];
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};
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@ -77,9 +79,10 @@ void uapi_compute_bundle_size(struct uverbs_api_ioctl_method *method_elm,
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unsigned int num_attrs)
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{
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struct bundle_priv *pbundle;
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struct uverbs_attr_bundle *bundle;
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size_t bundle_size =
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offsetof(struct bundle_priv, internal_buffer) +
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sizeof(*pbundle->bundle.attrs) * method_elm->key_bitmap_len +
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sizeof(*bundle->attrs) * method_elm->key_bitmap_len +
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sizeof(*pbundle->uattrs) * num_attrs;
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method_elm->use_stack = bundle_size <= sizeof(*pbundle);
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@ -107,7 +110,7 @@ __malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size,
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gfp_t flags)
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{
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struct bundle_priv *pbundle =
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container_of(bundle, struct bundle_priv, bundle);
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container_of(&bundle->hdr, struct bundle_priv, bundle);
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size_t new_used;
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void *res;
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@ -149,7 +152,7 @@ static int uverbs_set_output(const struct uverbs_attr_bundle *bundle,
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const struct uverbs_attr *attr)
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{
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struct bundle_priv *pbundle =
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container_of(bundle, struct bundle_priv, bundle);
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container_of(&bundle->hdr, struct bundle_priv, bundle);
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u16 flags;
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flags = pbundle->uattrs[attr->ptr_attr.uattr_idx].flags |
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@ -166,6 +169,8 @@ static int uverbs_process_idrs_array(struct bundle_priv *pbundle,
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struct ib_uverbs_attr *uattr,
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u32 attr_bkey)
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{
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struct uverbs_attr_bundle *bundle =
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container_of(&pbundle->bundle, struct uverbs_attr_bundle, hdr);
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const struct uverbs_attr_spec *spec = &attr_uapi->spec;
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size_t array_len;
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u32 *idr_vals;
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@ -184,7 +189,7 @@ static int uverbs_process_idrs_array(struct bundle_priv *pbundle,
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return -EINVAL;
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attr->uobjects =
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uverbs_alloc(&pbundle->bundle,
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uverbs_alloc(bundle,
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array_size(array_len, sizeof(*attr->uobjects)));
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if (IS_ERR(attr->uobjects))
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return PTR_ERR(attr->uobjects);
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@ -209,7 +214,7 @@ static int uverbs_process_idrs_array(struct bundle_priv *pbundle,
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for (i = 0; i != array_len; i++) {
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attr->uobjects[i] = uverbs_get_uobject_from_file(
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spec->u2.objs_arr.obj_type, spec->u2.objs_arr.access,
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idr_vals[i], &pbundle->bundle);
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idr_vals[i], bundle);
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if (IS_ERR(attr->uobjects[i])) {
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ret = PTR_ERR(attr->uobjects[i]);
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break;
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@ -240,7 +245,9 @@ static int uverbs_process_attr(struct bundle_priv *pbundle,
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struct ib_uverbs_attr *uattr, u32 attr_bkey)
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{
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const struct uverbs_attr_spec *spec = &attr_uapi->spec;
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struct uverbs_attr *e = &pbundle->bundle.attrs[attr_bkey];
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struct uverbs_attr_bundle *bundle =
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container_of(&pbundle->bundle, struct uverbs_attr_bundle, hdr);
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struct uverbs_attr *e = &bundle->attrs[attr_bkey];
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const struct uverbs_attr_spec *val_spec = spec;
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struct uverbs_obj_attr *o_attr;
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@ -288,7 +295,7 @@ static int uverbs_process_attr(struct bundle_priv *pbundle,
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if (val_spec->alloc_and_copy && !uverbs_attr_ptr_is_inline(e)) {
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void *p;
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p = uverbs_alloc(&pbundle->bundle, uattr->len);
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p = uverbs_alloc(bundle, uattr->len);
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if (IS_ERR(p))
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return PTR_ERR(p);
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@ -321,7 +328,7 @@ static int uverbs_process_attr(struct bundle_priv *pbundle,
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*/
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o_attr->uobject = uverbs_get_uobject_from_file(
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spec->u.obj.obj_type, spec->u.obj.access,
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uattr->data_s64, &pbundle->bundle);
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uattr->data_s64, bundle);
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if (IS_ERR(o_attr->uobject))
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return PTR_ERR(o_attr->uobject);
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__set_bit(attr_bkey, pbundle->uobj_finalize);
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@ -422,6 +429,8 @@ static int ib_uverbs_run_method(struct bundle_priv *pbundle,
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unsigned int num_attrs)
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{
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int (*handler)(struct uverbs_attr_bundle *attrs);
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struct uverbs_attr_bundle *bundle =
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container_of(&pbundle->bundle, struct uverbs_attr_bundle, hdr);
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size_t uattrs_size = array_size(sizeof(*pbundle->uattrs), num_attrs);
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unsigned int destroy_bkey = pbundle->method_elm->destroy_bkey;
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unsigned int i;
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@ -434,7 +443,7 @@ static int ib_uverbs_run_method(struct bundle_priv *pbundle,
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if (!handler)
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return -EIO;
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pbundle->uattrs = uverbs_alloc(&pbundle->bundle, uattrs_size);
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pbundle->uattrs = uverbs_alloc(bundle, uattrs_size);
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if (IS_ERR(pbundle->uattrs))
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return PTR_ERR(pbundle->uattrs);
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if (copy_from_user(pbundle->uattrs, pbundle->user_attrs, uattrs_size))
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@ -453,25 +462,23 @@ static int ib_uverbs_run_method(struct bundle_priv *pbundle,
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return -EINVAL;
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if (pbundle->method_elm->has_udata)
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uverbs_fill_udata(&pbundle->bundle,
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&pbundle->bundle.driver_udata,
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uverbs_fill_udata(bundle, &pbundle->bundle.driver_udata,
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UVERBS_ATTR_UHW_IN, UVERBS_ATTR_UHW_OUT);
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else
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pbundle->bundle.driver_udata = (struct ib_udata){};
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if (destroy_bkey != UVERBS_API_ATTR_BKEY_LEN) {
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struct uverbs_obj_attr *destroy_attr =
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&pbundle->bundle.attrs[destroy_bkey].obj_attr;
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struct uverbs_obj_attr *destroy_attr = &bundle->attrs[destroy_bkey].obj_attr;
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ret = uobj_destroy(destroy_attr->uobject, &pbundle->bundle);
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ret = uobj_destroy(destroy_attr->uobject, bundle);
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if (ret)
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return ret;
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__clear_bit(destroy_bkey, pbundle->uobj_finalize);
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ret = handler(&pbundle->bundle);
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ret = handler(bundle);
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uobj_put_destroy(destroy_attr->uobject);
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} else {
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ret = handler(&pbundle->bundle);
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ret = handler(bundle);
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}
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/*
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@ -481,10 +488,10 @@ static int ib_uverbs_run_method(struct bundle_priv *pbundle,
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*/
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if (!ret && pbundle->method_elm->has_udata) {
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const struct uverbs_attr *attr =
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uverbs_attr_get(&pbundle->bundle, UVERBS_ATTR_UHW_OUT);
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uverbs_attr_get(bundle, UVERBS_ATTR_UHW_OUT);
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if (!IS_ERR(attr))
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ret = uverbs_set_output(&pbundle->bundle, attr);
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ret = uverbs_set_output(bundle, attr);
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}
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/*
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@ -501,6 +508,8 @@ static int ib_uverbs_run_method(struct bundle_priv *pbundle,
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static void bundle_destroy(struct bundle_priv *pbundle, bool commit)
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{
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unsigned int key_bitmap_len = pbundle->method_elm->key_bitmap_len;
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struct uverbs_attr_bundle *bundle =
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container_of(&pbundle->bundle, struct uverbs_attr_bundle, hdr);
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struct bundle_alloc_head *memblock;
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unsigned int i;
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@ -508,20 +517,19 @@ static void bundle_destroy(struct bundle_priv *pbundle, bool commit)
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i = -1;
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while ((i = find_next_bit(pbundle->uobj_finalize, key_bitmap_len,
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i + 1)) < key_bitmap_len) {
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struct uverbs_attr *attr = &pbundle->bundle.attrs[i];
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struct uverbs_attr *attr = &bundle->attrs[i];
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uverbs_finalize_object(
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attr->obj_attr.uobject,
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attr->obj_attr.attr_elm->spec.u.obj.access,
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test_bit(i, pbundle->uobj_hw_obj_valid),
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commit,
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&pbundle->bundle);
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commit, bundle);
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}
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i = -1;
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while ((i = find_next_bit(pbundle->spec_finalize, key_bitmap_len,
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i + 1)) < key_bitmap_len) {
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struct uverbs_attr *attr = &pbundle->bundle.attrs[i];
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struct uverbs_attr *attr = &bundle->attrs[i];
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const struct uverbs_api_attr *attr_uapi;
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void __rcu **slot;
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@ -535,7 +543,7 @@ static void bundle_destroy(struct bundle_priv *pbundle, bool commit)
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if (attr_uapi->spec.type == UVERBS_ATTR_TYPE_IDRS_ARRAY) {
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uverbs_free_idrs_array(attr_uapi, &attr->objs_arr_attr,
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commit, &pbundle->bundle);
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commit, bundle);
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}
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}
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@ -578,7 +586,8 @@ static int ib_uverbs_cmd_verbs(struct ib_uverbs_file *ufile,
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method_elm->bundle_size -
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offsetof(struct bundle_priv, internal_buffer);
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pbundle->alloc_head.next = NULL;
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pbundle->allocated_mem = &pbundle->alloc_head;
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pbundle->allocated_mem = container_of(&pbundle->alloc_head,
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struct bundle_alloc_head, hdr);
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} else {
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pbundle = &onstack;
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pbundle->internal_avail = sizeof(pbundle->internal_buffer);
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@ -596,7 +605,8 @@ static int ib_uverbs_cmd_verbs(struct ib_uverbs_file *ufile,
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pbundle->user_attrs = user_attrs;
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pbundle->internal_used = ALIGN(pbundle->method_elm->key_bitmap_len *
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sizeof(*pbundle->bundle.attrs),
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sizeof(*container_of(&pbundle->bundle,
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struct uverbs_attr_bundle, hdr)->attrs),
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sizeof(*pbundle->internal_buffer));
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memset(pbundle->bundle.attr_present, 0,
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sizeof(pbundle->bundle.attr_present));
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@ -700,11 +710,13 @@ void uverbs_fill_udata(struct uverbs_attr_bundle *bundle,
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unsigned int attr_out)
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{
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struct bundle_priv *pbundle =
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container_of(bundle, struct bundle_priv, bundle);
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container_of(&bundle->hdr, struct bundle_priv, bundle);
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struct uverbs_attr_bundle *bundle_aux =
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container_of(&pbundle->bundle, struct uverbs_attr_bundle, hdr);
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const struct uverbs_attr *in =
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uverbs_attr_get(&pbundle->bundle, attr_in);
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uverbs_attr_get(bundle_aux, attr_in);
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const struct uverbs_attr *out =
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uverbs_attr_get(&pbundle->bundle, attr_out);
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uverbs_attr_get(bundle_aux, attr_out);
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if (!IS_ERR(in)) {
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udata->inlen = in->ptr_attr.len;
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@ -829,7 +841,7 @@ void uverbs_finalize_uobj_create(const struct uverbs_attr_bundle *bundle,
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u16 idx)
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{
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struct bundle_priv *pbundle =
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container_of(bundle, struct bundle_priv, bundle);
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container_of(&bundle->hdr, struct bundle_priv, bundle);
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__set_bit(uapi_bkey_attr(uapi_key_attr(idx)),
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pbundle->uobj_hw_obj_valid);
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@ -629,12 +629,14 @@ struct uverbs_attr {
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};
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struct uverbs_attr_bundle {
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struct_group_tagged(uverbs_attr_bundle_hdr, hdr,
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struct ib_udata driver_udata;
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struct ib_udata ucore;
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struct ib_uverbs_file *ufile;
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struct ib_ucontext *context;
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struct ib_uobject *uobject;
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DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
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);
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struct uverbs_attr attrs[];
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};
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