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Viewing changes to plugins.d/askpass-fifo.c

  • Committer: Teddy Hogeborn
  • Date: 2024-09-09 04:24:39 UTC
  • mto: This revision was merged to the branch mainline in revision 410.
  • Revision ID: teddy@recompile.se-20240909042439-j85mr20uli2hnyis
Eliminate compiler warnings

Many programs use nested functions, which now result in a linker
warning about executable stack.  Hide this warning.  Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).

* Makefile (plugin-runner, dracut-module/password-agent,
  plugins.d/password-prompt, plugins.d/mandos-client,
  plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
  --no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
  are looking through the process list, go though it from the start
  instead of from the end, i.e. in normal alphabetical order and not
  in reverse order.

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Lines of Context:
plugins.d/askpass-fifo.c
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/*
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 * Askpass-FIFO - Read a password from a FIFO and output it
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 * 
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 * Copyright © 2008-2018 Teddy Hogeborn
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 * Copyright © 2008-2018 Björn Påhlsson
 
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 * Copyright © 2008-2019, 2021 Teddy Hogeborn
 
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 * Copyright © 2008-2019, 2021 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             /* TEMP_FAILURE_RETRY() */
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#include <sys/types.h>          /* uid_t, gid_t, ssize_t */
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#include <sys/stat.h>           /* mkfifo(), S_IRUSR, S_IWUSR */
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#include <iso646.h>             /* and */
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#include <errno.h>              /* errno, EACCES, ENOTDIR, ELOOP,
 
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#define _GNU_SOURCE             /* vasprintf(),
 
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                                   program_invocation_short_name */
 
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#include <sys/types.h>          /* uid_t, gid_t, getuid(), getgid(),
 
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                                   setgid(), setuid() */
 
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#include <unistd.h>             /* uid_t, gid_t, ssize_t, getuid(),
 
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                                   getgid(), setgid(), setuid(),
 
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                                   read(), close(), write(),
 
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                                   STDOUT_FILENO */
 
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#include <stdarg.h>             /* va_list, va_start(), vfprintf() */
 
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#include <stdio.h>              /* vasprintf(), fprintf(), stderr,
 
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                                   vfprintf() */
 
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#include <errno.h>              /* program_invocation_short_name,
 
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                                   errno, EACCES, ENOTDIR, ELOOP,
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                                   ENAMETOOLONG, ENOSPC, EROFS,
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                                   ENOENT, EEXIST, EFAULT, EMFILE,
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                                   ENFILE, ENOMEM, EBADF, EINVAL, EIO,
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                                   EISDIR, EFBIG */
 
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#include <string.h>             /* strerror() */
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#include <error.h>              /* error() */
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#include <stdio.h>              /* fprintf(), vfprintf(),
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                                   vasprintf() */
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#include <stdlib.h>             /* EXIT_FAILURE, NULL, size_t, free(),
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                                   realloc(), EXIT_SUCCESS */
 
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#include <stdlib.h>             /* free(), realloc(), EXIT_SUCCESS */
 
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#include <sys/stat.h>           /* mkfifo(), S_IRUSR, S_IWUSR */
 
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#include <sysexits.h>           /* EX_OSFILE, EX_OSERR,
 
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                                   EX_UNAVAILABLE, EX_IOERR */
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#include <fcntl.h>              /* open(), O_RDONLY */
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#include <unistd.h>             /* read(), close(), write(),
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                                   STDOUT_FILENO */
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#include <sysexits.h>           /* EX_OSERR, EX_OSFILE,
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                                   EX_UNAVAILABLE, EX_IOERR */
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#include <string.h>             /* strerror() */
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#include <stdarg.h>             /* va_list, va_start(), ... */
 
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#include <stddef.h>             /* NULL, size_t */
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uid_t uid = 65534;
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gid_t gid = 65534;
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    fprintf(stderr, ": ");
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    fprintf(stderr, "%s\n", strerror(errnum));
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    error(status, errno, "vasprintf while printing error");
 
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    if(status){
 
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      __builtin_unreachable();
 
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    }
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    return;
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  }
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  fprintf(stderr, "Mandos plugin ");
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  error(status, errnum, "%s", text);
 
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  if(status){
 
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    __builtin_unreachable();
 
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  }
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  free(text);
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}
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    case ENOTDIR:
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    case ELOOP:
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      error_plus(EX_OSFILE, errno, "mkfifo");
 
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      __builtin_unreachable();
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    case ENAMETOOLONG:
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    case ENOSPC:
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    case EROFS:
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    default:
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      error_plus(EX_OSERR, errno, "mkfifo");
 
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      __builtin_unreachable();
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    case ENOENT:
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      /* no "/lib/cryptsetup"? */
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      error_plus(EX_UNAVAILABLE, errno, "mkfifo");
 
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      __builtin_unreachable();
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    case EEXIST:
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      break;                    /* not an error */
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    }