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Message #167539
[Bug 1540731] Re: SocketMessenger::update_session_creds() fails to get client PID, causing "[ FAILED ] PromptSessionClientAPI.client_pid_is_associated_with_session" on kernel 4.4 (but kernel 4.3 works)
** Also affects: linux (Ubuntu Vivid)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Vivid)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1540731
Title:
SocketMessenger::update_session_creds() fails to get client PID,
causing "[ FAILED ]
PromptSessionClientAPI.client_pid_is_associated_with_session" on
kernel 4.4 (but kernel 4.3 works)
Status in GLibC:
New
Status in Mir:
Invalid
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Vivid:
Fix Committed
Bug description:
Since updating to the 4.4.0-2 kernel recvmsg() fails SCM_CREDENTIALS
request with EOPNOTSUPP.
This manifests as a test failure in Mir:
[ RUN ] PromptSessionClientAPI.client_pid_is_associated_with_session
unknown file: Failure
Test case:
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
int main()
{
enum { server, client, size };
int socket_fd[size];
int const opt = 1;
assert(socketpair(AF_LOCAL, SOCK_STREAM, 0, socket_fd) == 0);
char const msg[] = "A random message";
send(socket_fd[client], msg, sizeof msg, MSG_DONTWAIT | MSG_NOSIGNAL);
assert(setsockopt(socket_fd[server], SOL_SOCKET, SO_PASSCRED,
&opt, sizeof(opt)) != -1);
union {
struct cmsghdr cmh;
char control[CMSG_SPACE(sizeof(ucred))];
} control_un;
control_un.cmh.cmsg_len = CMSG_LEN(sizeof(ucred));
control_un.cmh.cmsg_level = SOL_SOCKET;
control_un.cmh.cmsg_type = SCM_CREDENTIALS;
msghdr msgh;
msgh.msg_name = NULL;
msgh.msg_namelen = 0;
msgh.msg_iov = NULL;
msgh.msg_iovlen = 0;
msgh.msg_control = control_un.control;
msgh.msg_controllen = sizeof(control_un.control);
errno = 0;
if (recvmsg(socket_fd[server], &msgh, MSG_PEEK) == -1)
{
printf("Error: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
else
{
printf("Success!\n");
exit(EXIT_SUCCESS);
}
}
===
Kernel-Description: recvmsg() fails SCM_CREDENTIALS request with EOPNOTSUPP.
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