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API : ff_sendmsg, use transient variables to avoid polluting user's data.

This commit is contained in:
chenwei 2018-02-02 17:58:17 +08:00
parent 26fa2bc45b
commit b60bba339e
1 changed files with 11 additions and 4 deletions
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15
lib/ff_syscall_wrapper.c
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@ -609,13 +609,20 @@ ssize_t
ff_sendmsg(int s, const struct msghdr *msg, int flags) ff_sendmsg(int s, const struct msghdr *msg, int flags)
{ {
int rc; int rc;
struct sockaddr freebsd_sa;
void *linux_sa = msg->msg_name;
if (msg->msg_name != NULL) { if (linux_sa != NULL) {
linux2freebsd_sockaddr(msg->msg_name, linux2freebsd_sockaddr(linux_sa,
sizeof(struct linux_sockaddr), msg->msg_name); sizeof(struct linux_sockaddr), &freebsd_sa);
__DECONST(struct msghdr *, msg)->msg_name = &freebsd_sa;
} }
if ((rc = sendit(curthread, s, __DECONST(struct msghdr *, msg), flags))) rc = sendit(curthread, s, __DECONST(struct msghdr *, msg), flags);
__DECONST(struct msghdr *, msg)->msg_name = linux_sa;
if (rc)
goto kern_fail; goto kern_fail;
return (rc); return (rc);