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net: copy from user before calling __get_compat_msghdr

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this is in preparation for multishot receive from io_uring, where it needs
to have access to the original struct user_msghdr.

functionally this should be a no-op.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220714110258.1336200-3-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dylan Yudaken
2022-07-14 04:02:57 -07:00
committed by Jens Axboe
parent 7fa875b8e5
commit 72c531f8ef
3 changed files with 28 additions and 33 deletions
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5
include/net/compat.h
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@@ -46,9 +46,8 @@ struct compat_rtentry {
unsigned short rt_irtt; /* Initial RTT */
};
int __get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg,
struct sockaddr __user **save_addr, compat_uptr_t *ptr,
compat_size_t *len);
int __get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr *msg,
struct sockaddr __user **save_addr);
int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *,
struct sockaddr __user **, struct iovec **);
int put_cmsg_compat(struct msghdr*, int, int, int, void *);