[PATCH v2 07/22] coredump: pin the protocol struct sizes

COREDUMP_REQ_SIZE_VER0 and COREDUMP_ACK_SIZE_VER0 define the initial
struct sizes.

Assert that both published sizes still match their structs. While at it
fix some issues with docs.

Signed-off-by: Christian Brauner (Amutable) <[email protected]>
---
 fs/coredump.c                 | 2 ++
 include/uapi/linux/coredump.h | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index 24a6405ea242..c696b46c97ff 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -759,6 +759,8 @@ static inline bool coredump_sock_send(struct file *file, struct coredump_req *re
 	return ret == sizeof(*req);
 }
 
+static_assert(sizeof(struct coredump_req) == COREDUMP_REQ_SIZE_VER0);
+static_assert(sizeof(struct coredump_ack) == COREDUMP_ACK_SIZE_VER0);
 static_assert(sizeof(enum coredump_mark) == sizeof(__u32));
 
 static inline bool coredump_sock_mark(struct file *file, enum coredump_mark mark)
diff --git a/include/uapi/linux/coredump.h b/include/uapi/linux/coredump.h
index dc3789b78af0..662e0468da6e 100644
--- a/include/uapi/linux/coredump.h
+++ b/include/uapi/linux/coredump.h
@@ -30,11 +30,11 @@ enum {
  * member is set to the size of struct coredump_req and provides a hint
  * to userspace how much data can be read. Userspace may use MSG_PEEK to
  * peek the size of struct coredump_req and then choose to consume it in
- * one go. Userspace may also simply read a COREDUMP_ACK_SIZE_VER0
+ * one go. Userspace may also simply read a COREDUMP_REQ_SIZE_VER0
  * request. If the size the kernel sends is larger userspace simply
  * discards any remaining data.
  *
- * The coredump_req->mask member is set to the currently know features.
+ * The coredump_req->mask member is set to the currently known features.
  * Userspace may only set coredump_ack->mask to the bits raised by the
  * kernel in coredump_req->mask.
  *

-- 
2.53.0