Date: Mon, 14 Aug 2023 12:47:21 GMT From: Dmitry Chagin <dchagin@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 2467ccddc0e0 - main - linux(4): Fix MSG_CTRUNC handling in recvmsg() Message-ID: <202308141247.37EClLOo044464@gitrepo.freebsd.org>
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The branch main has been updated by dchagin: URL: https://cgit.FreeBSD.org/src/commit/?id=2467ccddc0e0f5c719eddaece69a7aa0589b6449 commit 2467ccddc0e0f5c719eddaece69a7aa0589b6449 Author: Dmitry Chagin <dchagin@FreeBSD.org> AuthorDate: 2023-08-14 12:46:12 +0000 Commit: Dmitry Chagin <dchagin@FreeBSD.org> CommitDate: 2023-08-14 12:46:12 +0000 linux(4): Fix MSG_CTRUNC handling in recvmsg() The MSG_CTRUNC flag of the msg_flags member of the message header is set uppon successful completition if the control data was truncated. Upon return from a successful call msg_controllen should contain the length of the control message sequence. Fixes: 0eda2cea MFC after: 1 week --- sys/compat/linux/linux_socket.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/sys/compat/linux/linux_socket.c b/sys/compat/linux/linux_socket.c index bd4b536e13d0..7acae92777f8 100644 --- a/sys/compat/linux/linux_socket.c +++ b/sys/compat/linux/linux_socket.c @@ -1835,8 +1835,8 @@ linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr, if (error != 0) goto bad; + skiped = outlen = 0; maxlen = l_msghdr.msg_controllen; - l_msghdr.msg_controllen = 0; if (control == NULL) goto out; @@ -1844,7 +1844,6 @@ linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr, msg->msg_control = mtod(control, struct cmsghdr *); msg->msg_controllen = control->m_len; outbuf = PTRIN(l_msghdr.msg_control); - skiped = outlen = 0; for (m = control; m != NULL; m = m->m_next) { cm = mtod(m, struct cmsghdr *); lcm->cmsg_type = bsd_to_linux_cmsg_type(p, cm->cmsg_type, @@ -1910,9 +1909,9 @@ err: error = EINVAL; goto bad; } - l_msghdr.msg_controllen = outlen; out: + l_msghdr.msg_controllen = outlen; error = copyout(&l_msghdr, msghdr, sizeof(l_msghdr)); bad:
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