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Some Linux applications (ping) pass a non-NULL msg_control argument to

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sendmsg() while using a 0-length msg_controllen.  This isn't allowed in
the FreeBSD system call ABI, so detect this case and set msg_control to
NULL.  This allows Linux ping to work.

Submitted by:	rdivacky
This commit is contained in:
Robert Watson 2007-04-14 10:35:09 +00:00
parent faac60c8fc
commit d72a615878
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=168711
1 changed files with 10 additions and 0 deletions
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10
sys/compat/linux/linux_socket.c
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@ -1028,6 +1028,16 @@ linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
error = copyin(PTRIN(linux_args.msg), &msg, sizeof(msg));
if (error)
return (error);
/*
* Some Linux applications (ping) define a non-NULL control data
* pointer, but a msg_controllen of 0, which is not allowed in the
* FreeBSD system call interface. NULL the msg_control pointer in
* order to handle this case. This should be checked, but allows the
* Linux ping to work.
*/
if (msg.msg_control != NULL && msg.msg_controllen == 0)
msg.msg_control = NULL;
error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
if (error)
return (error);