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coredump: pin the protocol struct sizes

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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.

Link: https://patch.msgid.link/20260820-work-coredump-sparse-v2-7-ba32dd718c51@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2026-08-20 01:09:24 +02:00
parent eec8727ba2
commit dbaf323ace
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GPG Key ID: 91C61BC06578DCA2
2 changed files with 4 additions and 2 deletions
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2
fs/coredump.c
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@ -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)

4
include/uapi/linux/coredump.h
View File

@ -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.
*