Mercurial > hg > octave-jordi > gnulib-hg
annotate m4/fcntl_h.m4 @ 12180:2c71cf09ef7e
Avoid symlink attack in localcharset module.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 18 Oct 2009 16:58:39 +0200 |
| parents | 01c9ffd58a51 |
| children | e8d2c6fc33ad |
| rev | line source |
|---|---|
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12180
2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
|
1 # serial 6 |
| 7225 | 2 # Configure fcntl.h. |
|
11007
f6cba5a556ce
many *.m4 files: improve m4 quoting
Jim Meyering <meyering@redhat.com>
parents:
9299
diff
changeset
|
3 dnl Copyright (C) 2006, 2007, 2009 Free Software Foundation, Inc. |
| 7225 | 4 dnl This file is free software; the Free Software Foundation |
| 5 dnl gives unlimited permission to copy and/or distribute it, | |
| 6 dnl with or without modifications, as long as this notice is preserved. | |
| 7 | |
| 8 dnl Written by Paul Eggert. | |
| 9 | |
| 10 AC_DEFUN([gl_FCNTL_H], | |
| 11 [ | |
| 11482 | 12 AC_REQUIRE([gl_FCNTL_H_DEFAULTS]) |
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12180
2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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13 AC_REQUIRE([gl_FCNTL_O_FLAGS]) |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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14 gl_CHECK_NEXT_HEADERS([fcntl.h]) |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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15 FCNTL_H='fcntl.h' |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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16 AC_SUBST([FCNTL_H]) |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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17 ]) |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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18 |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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19 # Test whether the flags O_NOATIME and O_NOFOLLOW actually work. |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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20 # Define HAVE_WORKING_O_NOATIME to 1 if O_NOATIME works, or to 0 otherwise. |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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21 # Define HAVE_WORKING_O_NOFOLLOW to 1 if O_NOFOLLOW works, or to 0 otherwise. |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
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22 AC_DEFUN([gl_FCNTL_O_FLAGS], |
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2c71cf09ef7e
Avoid symlink attack in localcharset module.
Bruno Haible <bruno@clisp.org>
parents:
12051
diff
changeset
|
23 [ |
| 11482 | 24 dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW. |
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11479
2e168b9fc9aa
Make fcntl module detect O_NOATIME, O_NOFOLLOW on GNU/Linux.
Ben Pfaff <blp@cs.stanford.edu>
parents:
11007
diff
changeset
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25 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
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11007
f6cba5a556ce
many *.m4 files: improve m4 quoting
Jim Meyering <meyering@redhat.com>
parents:
9299
diff
changeset
|
26 AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], |
| 7225 | 27 [AC_RUN_IFELSE( |
| 28 [AC_LANG_PROGRAM( | |
| 29 [[#include <sys/types.h> | |
| 30 #include <sys/stat.h> | |
| 31 #include <unistd.h> | |
| 32 #include <fcntl.h> | |
| 7408 | 33 #ifndef O_NOATIME |
| 34 #define O_NOATIME 0 | |
| 35 #endif | |
| 7225 | 36 #ifndef O_NOFOLLOW |
| 37 #define O_NOFOLLOW 0 | |
| 38 #endif | |
| 39 static int const constants[] = | |
| 40 { | |
| 41 O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND, | |
| 42 O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY | |
| 43 }; | |
| 44 ]], | |
| 7408 | 45 [[ |
| 46 int status = !constants; | |
| 47 { | |
| 48 static char const sym[] = "conftest.sym"; | |
| 49 if (symlink (".", sym) != 0 | |
| 50 || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0) | |
| 51 status |= 32; | |
|
12051
01c9ffd58a51
link-follow: ensure correct result
Eric Blake <ebb9@byu.net>
parents:
12047
diff
changeset
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52 unlink (sym); |
| 7408 | 53 } |
| 54 { | |
| 55 static char const file[] = "confdefs.h"; | |
| 56 int fd = open (file, O_RDONLY | O_NOATIME); | |
| 57 char c; | |
| 58 struct stat st0, st1; | |
| 59 if (fd < 0 | |
| 60 || fstat (fd, &st0) != 0 | |
| 61 || sleep (1) != 0 | |
| 62 || read (fd, &c, 1) != 1 | |
| 63 || close (fd) != 0 | |
| 64 || stat (file, &st1) != 0 | |
|
7687
7fcc949f763a
* m4/fcntl_h.m4 (gl_FCNTL_H): Test the atime, not the mtime.
Paul Eggert <eggert@cs.ucla.edu>
parents:
7408
diff
changeset
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65 || st0.st_atime != st1.st_atime) |
| 7408 | 66 status |= 64; |
| 67 } | |
| 68 return status;]])], | |
| 7225 | 69 [gl_cv_header_working_fcntl_h=yes], |
| 7408 | 70 [case $? in #( |
| 71 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #( | |
| 72 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #( | |
| 73 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #( | |
| 74 *) gl_cv_header_working_fcntl_h='no';; | |
| 75 esac], | |
| 7225 | 76 [gl_cv_header_working_fcntl_h=cross-compiling])]) |
| 77 | |
| 7408 | 78 case $gl_cv_header_working_fcntl_h in #( |
| 79 *O_NOATIME* | no | cross-compiling) ac_val=0;; #( | |
| 80 *) ac_val=1;; | |
| 81 esac | |
| 82 AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val], | |
| 83 [Define to 1 if O_NOATIME works.]) | |
| 84 | |
| 85 case $gl_cv_header_working_fcntl_h in #( | |
| 86 *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #( | |
| 87 *) ac_val=1;; | |
| 88 esac | |
| 89 AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val], | |
| 90 [Define to 1 if O_NOFOLLOW works.]) | |
| 7225 | 91 ]) |
| 9299 | 92 |
| 93 AC_DEFUN([gl_FCNTL_MODULE_INDICATOR], | |
| 94 [ | |
| 95 dnl Use AC_REQUIRE here, so that the default settings are expanded once only. | |
| 96 AC_REQUIRE([gl_FCNTL_H_DEFAULTS]) | |
| 97 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1 | |
| 98 ]) | |
| 99 | |
| 100 AC_DEFUN([gl_FCNTL_H_DEFAULTS], | |
| 101 [ | |
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12047
21ec8b9a3f27
openat: fix openat bugs on Solaris 9
Eric Blake <ebb9@byu.net>
parents:
11966
diff
changeset
|
102 GNULIB_OPEN=0; AC_SUBST([GNULIB_OPEN]) |
|
21ec8b9a3f27
openat: fix openat bugs on Solaris 9
Eric Blake <ebb9@byu.net>
parents:
11966
diff
changeset
|
103 GNULIB_OPENAT=0; AC_SUBST([GNULIB_OPENAT]) |
| 9299 | 104 dnl Assume proper GNU behavior unless another module says otherwise. |
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12047
21ec8b9a3f27
openat: fix openat bugs on Solaris 9
Eric Blake <ebb9@byu.net>
parents:
11966
diff
changeset
|
105 HAVE_OPENAT=1; AC_SUBST([HAVE_OPENAT]) |
|
21ec8b9a3f27
openat: fix openat bugs on Solaris 9
Eric Blake <ebb9@byu.net>
parents:
11966
diff
changeset
|
106 REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN]) |
|
21ec8b9a3f27
openat: fix openat bugs on Solaris 9
Eric Blake <ebb9@byu.net>
parents:
11966
diff
changeset
|
107 REPLACE_OPENAT=0; AC_SUBST([REPLACE_OPENAT]) |
| 9299 | 108 ]) |