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overflow: Clarify expectations for getting DEFINE_FLEX variable sizes

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Mention the use of __member_size() for DEFINE_FLEX variables as a hint
for getting at the compile-time size of the resulting flexible array
member.

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20250416172911.work.854-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook
2025-04-16 10:29:15 -07:00
parent a510c186ab
commit 9a93048476
1 changed files with 2 additions and 0 deletions
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include/linux/overflow.h
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@@ -419,6 +419,7 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend)
* Define a zeroed, on-stack, instance of @type structure with a trailing
* flexible array member.
* Use __struct_size(@name) to get compile-time size of it afterwards.
* Use __member_size(@name->member) to get compile-time size of @name members.
*/
#define DEFINE_RAW_FLEX(type, name, member, count) \
_DEFINE_FLEX(type, name, member, count, = {})
@@ -436,6 +437,7 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend)
* Define a zeroed, on-stack, instance of @TYPE structure with a trailing
* flexible array member.
* Use __struct_size(@NAME) to get compile-time size of it afterwards.
* Use __member_size(@NAME->member) to get compile-time size of @NAME members.
*/
#define DEFINE_FLEX(TYPE, NAME, MEMBER, COUNTER, COUNT) \
_DEFINE_FLEX(TYPE, NAME, MEMBER, COUNT, = { .obj.COUNTER = COUNT, })