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Viewing changes to dracut-module/password-agent.c

  • Committer: teddy at recompile
  • Date: 2020-11-29 22:54:26 UTC
  • Revision ID: teddy@recompile.se-20201129225426-6ud4hwj36zo67igi
http://bugs.debian.org/975457
Fix flaky test in password-agent

The test_send_password_to_socket_EMSGSIZE function should not use a
hard-coded constant to trigger an EMSGSIZE error from send().

* dracut-module/password-agent.c (send_password_to_socket): Only save
  errno from send() if it returned < 0.  Show strerror(errno) if
  send() does return EMSGSIZE.  Show number of bytes sent if send()
  sends less than all bytes.
  (test_send_password_to_socket_EMSGSIZE): Do not skip this test on
  non-AMD64 platforms.  Try to find a suitable message size to trigger
  EMSGSIZE before testing send_password_to_socket(), and only skip
  this test if such a triggering message size is not found.

Reported-By: Simon McVittie <smcv@debian.org>
Closes: #975457

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dracut-module/password-agent.c
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/*
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 * Mandos password agent - Simple password agent to run Mandos client
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 *
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 * Copyright © 2019-2021 Teddy Hogeborn
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 * Copyright © 2019-2021 Björn Påhlsson
 
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 * Copyright © 2019-2020 Teddy Hogeborn
 
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 * Copyright © 2019-2020 Björn Påhlsson
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 * 
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 * This file is part of Mandos.
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 * 
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 * Contact the authors at <mandos@recompile.se>.
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 */
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#define _GNU_SOURCE             /* pipe2(), O_CLOEXEC, setresgid(),
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                                   setresuid(), asprintf(), getline(),
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                                   basename() */
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#include <inttypes.h>           /* uintmax_t, strtoumax(), PRIuMAX,
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                                   PRIdMAX, intmax_t, uint32_t,
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                                   SCNx32, SCNuMAX, SCNxMAX */
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#include <stddef.h>             /* size_t, NULL */
 
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#define _GNU_SOURCE
 
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#include <inttypes.h>           /* uintmax_t, PRIuMAX, PRIdMAX,
 
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                                   intmax_t, uint32_t, SCNx32,
 
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                                   SCNuMAX, SCNxMAX */
 
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#include <stddef.h>             /* size_t */
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#include <sys/types.h>          /* pid_t, uid_t, gid_t, getuid(),
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                                   getpid() */
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#include <stdbool.h>            /* bool, true, false */
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                                   NSIG, sigismember(), SA_ONSTACK,
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                                   SIG_DFL, SIG_IGN, SIGINT, SIGQUIT,
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                                   SIGHUP, SIGSTOP, SIG_UNBLOCK */
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#include <unistd.h>             /* uid_t, gid_t, close(), pipe2(),
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                                   fork(), _exit(), dup2(),
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                                   STDOUT_FILENO, setresgid(),
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                                   setresuid(), execv(), ssize_t,
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                                   read(), dup3(), getuid(), dup(),
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                                   STDERR_FILENO, pause(), write(),
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                                   rmdir(), unlink(), getpid() */
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#include <stdlib.h>             /* EXIT_SUCCESS, EXIT_FAILURE,
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                                   malloc(), free(), realloc(),
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                                   setenv(), calloc(), mkdtemp(),
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                                   mkostemp() */
 
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                                   malloc(), free(), strtoumax(),
 
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                                   realloc(), setenv(), calloc(),
 
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                                   mkdtemp(), mkostemp() */
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#include <iso646.h>             /* not, or, and, xor */
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#include <error.h>              /* error() */
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#include <sysexits.h>           /* EX_USAGE, EX_OSERR, EX_OSFILE */
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#include <string.h>             /* strdup(), memcpy(),
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                                   explicit_bzero(), memset(),
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                                   strcmp(), strlen(), strncpy(),
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                                   memcmp(), basename(), strerror() */
 
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                                   memcmp(), basename() */
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#include <argz.h>               /* argz_create(), argz_count(),
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                                   argz_extract(), argz_next(),
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                                   argz_add() */
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                                   ARGP_ERR_UNKNOWN, ARGP_KEY_ARGS,
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                                   struct argp, argp_parse(),
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                                   ARGP_NO_EXIT */
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#include <stdint.h>             /* SIZE_MAX, uint32_t */
 
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#include <stdint.h>             /* SIZE_MAX */
 
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#include <unistd.h>             /* uid_t, gid_t, close(), pipe2(),
 
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                                   fork(), _exit(), dup2(),
 
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                                   STDOUT_FILENO, setresgid(),
 
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                                   setresuid(), execv(), ssize_t,
 
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                                   read(), dup3(), getuid(), dup(),
 
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                                   STDERR_FILENO, pause(), write(),
 
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                                   rmdir(), unlink(), getpid() */
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#include <sys/mman.h>           /* munlock(), mlock() */
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#include <fcntl.h>              /* O_CLOEXEC, O_NONBLOCK, fcntl(),
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                                   F_GETFD, F_GETFL, FD_CLOEXEC,
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                        g_assert_null(), g_assert_false(),
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                        g_assert_cmpint(), g_assert_cmpuint(),
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                        g_test_skip(), g_assert_cmpstr(),
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                        g_test_message(), g_test_init(), g_test_add(),
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                        g_test_run(), GOptionContext,
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                        g_option_context_new(),
 
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                        g_test_init(), g_test_add(), g_test_run(),
 
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                        GOptionContext, g_option_context_new(),
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                        g_option_context_set_help_enabled(), FALSE,
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                        g_option_context_set_ignore_unknown_options(),
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                        gboolean, GOptionEntry, G_OPTION_ARG_NONE,
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      g_test_skip("Skipping EMSGSIZE test: Will not try 1GiB");
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      return;
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    }
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    message_buffer = realloc(message_buffer, message_size);
 
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    free(message_buffer);
 
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    message_buffer = malloc(message_size);
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    if(message_buffer == NULL){
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      g_test_skip("Skipping EMSGSIZE test");
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      g_test_message("Failed to malloc() %" PRIuMAX " bytes",
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        g_test_message("Error on send(): %s", strerror(saved_errno));
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        return;
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      }
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      break;
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    } else if(ssret != (ssize_t)message_size){
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      g_test_skip("Skipping EMSGSIZE test");
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      g_test_message("Partial send(): %" PRIuMAX " of %" PRIdMAX