[PATCH 03/11] coredump: pin the protocol struct sizes

[Christian Brauner <brauner@kernel.org>]

COREDUMP_REQ_SIZE_VER0 and COREDUMP_ACK_SIZE_VER0 define the initial
struct sizes.

Assert that both published sizes still match their structs, next to the
assert the coredump marks already have. While at it fix the "currently
know" typo in the doc.

Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
---
 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 e68a76ff92a3..235b54484107 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -752,6 +752,8 @@ 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