kernel-packages team mailing list archive

[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

** Description changed:

  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;
+     enum { server, client, size };
+     int socket_fd[size];
+     int const opt = 1;
  
-     assert(socketpair(AF_LOCAL, SOCK_STREAM, 0, socket_fd) == 0);
+     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);
+     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,
+     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;
+     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;
+     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);
+     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;
+     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);
-     }
+     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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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:
  Confirmed
Status in linux package in Ubuntu:
  In Progress

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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