mirror of
https://github.com/fluencelabs/musl
synced 2025-06-02 17:41:37 +00:00
96107564e2
the kernel wrongly expects the cmsg length field to be size_t instead of socklen_t. in order to work around the issue, we have to impose a length limit and copy to a local buffer. the length limit should be more than sufficient for any real-world use; these headers are only used for passing file descriptors and permissions between processes over unix sockets.
31 lines
670 B
C
31 lines
670 B
C
#include <sys/socket.h>
|
|
#include <limits.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include "syscall.h"
|
|
#include "libc.h"
|
|
|
|
ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
|
|
{
|
|
#if LONG_MAX > INT_MAX
|
|
struct msghdr h;
|
|
struct cmsghdr chbuf[1024/sizeof(struct cmsghdr)+1], *c;
|
|
if (msg) {
|
|
h = *msg;
|
|
h.__pad1 = h.__pad2 = 0;
|
|
msg = &h;
|
|
if (h.msg_controllen) {
|
|
if (h.msg_controllen > 1024) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
memcpy(chbuf, h.msg_control, h.msg_controllen);
|
|
h.msg_control = chbuf;
|
|
for (c=CMSG_FIRSTHDR(&h); c; c=CMSG_NXTHDR(&h,c))
|
|
c->__pad1 = 0;
|
|
}
|
|
}
|
|
#endif
|
|
return socketcall_cp(sendmsg, fd, msg, flags, 0, 0, 0);
|
|
}
|