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  • Committer: teddy at recompile
  • Date: 2020-12-03 20:30:45 UTC
  • Revision ID: teddy@recompile.se-20201203203045-iqd6nq9y5nwalh1x
Minor fix of a test function

In dracut-module/password-agent, the test function
test_send_password_to_socket_EMSGSIZE() (which tests that the
send_password_to_socket() task function aborts properly when getting
EMSGSIZE when writing to the password socket), part of the test code
is supposed to find a message size which definitely does trigger
EMSGSIZE when send()ing to a socket.  Without a "break" in the proper
place, however, the size given is always exactly 1024 bytes too large.

This is very probably not a problem, since a too large message will
still be too large if it is increased by 1024 bytes, and send(2) in
practice checks the size before reading the buffer.  The biggest issue
would be if some version of send(2) would try to look at the last 1024
bytes of the message buffer before checking the message size; this
would then lead to a buffer over-read when running this test function.
(But even then there would be no security implications since the tests
are not run in the normal operation of the program.)

* dracut-module/password-agent.c
  (test_send_password_to_socket_EMSGSIZE): Break out early when ssret
  < 0 and errno == EMSGSIZE; don't allow loop to increase message_size
  again.

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Lines of Context:
plugin-runner.c
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/*
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 * Mandos plugin runner - Run Mandos plugins
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 *
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 * Copyright © 2008-2021 Teddy Hogeborn
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 * Copyright © 2008-2021 Björn Påhlsson
 
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 * Copyright © 2008-2020 Teddy Hogeborn
 
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 * Copyright © 2008-2020 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             /* strchrnul(), TEMP_FAILURE_RETRY(),
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                                   getline(), asprintf(), O_CLOEXEC,
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                                   scandirat(), pipe2() */
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#include <argp.h>               /* argp_program_version,
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                                   argp_program_bug_address,
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                                   struct argp_option,
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                                   struct argp_state, argp_error(),
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                                   ARGP_NO_EXIT, argp_state_help,
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                                   ARGP_HELP_STD_HELP,
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                                   ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
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                                   ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
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                                   struct argp, argp_parse(),
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                                   ARGP_IN_ORDER, ARGP_NO_HELP */
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#include <stdbool.h>            /* bool, false, true */
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#include <sys/types.h>          /* pid_t, sig_atomic_t, uid_t, gid_t,
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                                   getuid(), setgid(), setuid() */
 
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#define _GNU_SOURCE             /* TEMP_FAILURE_RETRY(), getline(),
 
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                                   O_CLOEXEC, pipe2() */
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#include <stddef.h>             /* size_t, NULL */
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#include <iso646.h>             /* or, and, not */
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#include <string.h>             /* strcmp(), strdup(), strchrnul(),
45
 
                                   strncmp(), strlen(), strcpy(),
46
 
                                   strsep(), strchr(), strsignal() */
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#include <stdlib.h>             /* malloc(), free(), reallocarray(),
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                                   realloc(), EXIT_SUCCESS */
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#include <errno.h>              /* errno, EINTR, ENOMEM, ECHILD,
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                                   error_t, EINVAL, EMFILE, ENFILE,
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                                   ENOENT, ESRCH */
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#include <stdint.h>             /* SIZE_MAX */
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#define _GNU_SOURCE             /* strchrnul(), TEMP_FAILURE_RETRY(),
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                                   getline(), asprintf(), O_CLOEXEC,
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                                   scandirat(), pipe2() */
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#include <unistd.h>             /* TEMP_FAILURE_RETRY(), ssize_t,
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                                   write(), STDOUT_FILENO, uid_t,
58
 
                                   gid_t, getuid(), fchown(), close(),
59
 
                                   symlink(), setgid(), setuid(),
60
 
                                   faccessat(), X_OK, pipe(), pipe2(),
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                                   fork(), _exit(), dup2(), fexecve(),
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                                   read(), getpass() */
 
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#include <stdlib.h>             /* malloc(), reallocarray(), realloc(),
 
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                                   EXIT_SUCCESS, exit() */
 
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#include <stdbool.h>            /* bool, true, false */
 
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#include <stdio.h>              /* fileno(), fprintf(),
 
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                                   stderr, STDOUT_FILENO, fclose() */
 
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#include <sys/types.h>          /* fstat(), struct stat, waitpid(),
 
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                                   WIFEXITED(), WEXITSTATUS(), wait(),
 
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                                   pid_t, uid_t, gid_t, getuid(),
 
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                                   getgid() */
 
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#include <sys/select.h>         /* fd_set, select(), FD_ZERO(),
 
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                                   FD_SET(), FD_ISSET(), FD_CLR */
 
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#include <sys/wait.h>           /* wait(), waitpid(), WIFEXITED(),
 
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                                   WEXITSTATUS(), WTERMSIG() */
 
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#include <sys/stat.h>           /* struct stat, fstat(), S_ISREG() */
 
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#include <iso646.h>             /* and, or, not */
 
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#include <dirent.h>             /* struct dirent, scandirat() */
 
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#include <unistd.h>             /* fcntl(), F_GETFD, F_SETFD,
 
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                                   FD_CLOEXEC, write(), STDOUT_FILENO,
 
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                                   struct stat, fstat(), close(),
 
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                                   setgid(), setuid(), S_ISREG(),
 
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                                   faccessat() pipe2(), fork(),
 
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                                   _exit(), dup2(), fexecve(), read()
 
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                                */
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#include <fcntl.h>              /* fcntl(), F_GETFD, F_SETFD,
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                                   FD_CLOEXEC, open(), O_RDONLY,
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                                   O_CLOEXEC, openat() */
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#include <sys/wait.h>           /* waitpid(), WNOHANG, WIFEXITED(),
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                                   WEXITSTATUS(), WIFSIGNALED(),
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                                   WTERMSIG(), wait() */
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#include <error.h>              /* error() */
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#include <stdio.h>              /* FILE, fprintf(), fopen(),
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                                   getline(), fclose(), EOF,
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                                   asprintf(), stderr */
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#include <dirent.h>             /* struct dirent, scandirat(),
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                                   alphasort() */
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#include <sys/stat.h>           /* struct stat, fstat(), S_ISDIR(),
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                                   lstat(), S_ISREG() */
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#include <sys/select.h>         /* fd_set, FD_ZERO(), FD_SETSIZE,
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                                   FD_SET(), select(), FD_CLR(),
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                                   FD_ISSET() */
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#include <signal.h>             /* struct sigaction, SA_NOCLDSTOP,
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                                   sigemptyset(), sigaddset(),
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                                   SIGCHLD, sigprocmask(), SIG_BLOCK,
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                                   SIG_UNBLOCK, kill(), SIGTERM */
 
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                                   FD_CLOEXEC, openat(), scandirat(),
 
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                                   pipe2() */
 
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#include <string.h>             /* strsep, strlen(), strsignal(),
 
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                                   strcmp(), strncmp() */
 
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#include <errno.h>              /* errno */
 
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#include <argp.h>               /* struct argp_option, struct
 
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                                   argp_state, struct argp,
 
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                                   argp_parse(), ARGP_ERR_UNKNOWN,
 
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                                   ARGP_KEY_END, ARGP_KEY_ARG,
 
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                                   error_t */
 
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#include <signal.h>             /* struct sigaction, sigemptyset(),
 
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                                   sigaddset(), sigaction(),
 
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                                   sigprocmask(), SIG_BLOCK, SIGCHLD,
 
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                                   SIG_UNBLOCK, kill(), sig_atomic_t
 
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                                */
 
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#include <errno.h>              /* errno, EBADF */
 
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#include <inttypes.h>           /* intmax_t, PRIdMAX, strtoimax() */
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#include <sysexits.h>           /* EX_OSERR, EX_USAGE, EX_IOERR,
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                                   EX_CONFIG, EX_UNAVAILABLE, EX_OK */
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#include <inttypes.h>           /* intmax_t, strtoimax(), PRIdMAX */
87
 
#include <fnmatch.h>            /* fnmatch(), FNM_FILE_NAME,
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                                   FNM_PERIOD, FNM_NOMATCH */
 
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#include <errno.h>              /* errno */
 
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#include <error.h>              /* error() */
 
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#include <fnmatch.h>            /* fnmatch() */
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#define BUFFER_SIZE 256
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        custom_argc += 1;
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        {
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#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
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          char **new_argv = reallocarray(custom_argv,
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                                         (size_t)custom_argc + 1,
 
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          char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
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                                         sizeof(char *));
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#else
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          char **new_argv = NULL;
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      }
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      close(plugindir_fd);
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    }
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    /* Work around Debian bug #981302
878
 
       <https://bugs.debian.org/981302> */
879
 
    if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
 
      ret = symlink("/proc/self/fd", "/dev/fd");
881
 
      if(ret == -1){
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        error(0, errno, "Failed to create /dev/fd symlink");
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      }
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    }
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  }
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  /* Lower permissions */