| 1 | /* Test for endpwent->getpwent crash for BZ #24695 |
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| 2 | Copyright (C) 2019-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <stdlib.h> |
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| 20 | #include <string.h> |
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| 21 | #include <sys/types.h> |
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| 22 | #include <pwd.h> |
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| 23 | |
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| 24 | #include <support/support.h> |
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| 25 | #include <support/check.h> |
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| 26 | #include <support/xstdlib.h> |
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| 27 | |
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| 28 | /* It is entirely allowed to start with a getpwent call without |
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| 29 | resetting the state of the service via a call to setpwent. |
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| 30 | You can also call getpwent more times than you have entries in |
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| 31 | the service, and it should not fail. This test iteratates the |
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| 32 | database once, gets to the end, and then attempts a second |
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| 33 | iteration to look for crashes. */ |
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| 34 | |
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| 35 | static void |
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| 36 | try_it (void) |
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| 37 | { |
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| 38 | struct passwd *pw; |
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| 39 | |
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| 40 | /* setpwent is intentionally omitted here. The first call to |
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| 41 | getpwent detects that it's first and initializes. The second |
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| 42 | time try_it is called, this "first call" was not detected before |
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| 43 | the fix, and getpwent would crash. */ |
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| 44 | |
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| 45 | while ((pw = getpwent ()) != NULL) |
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| 46 | ; |
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| 47 | |
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| 48 | /* We only care if this segfaults or not. */ |
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| 49 | endpwent (); |
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| 50 | } |
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| 51 | |
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| 52 | static int |
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| 53 | do_test (void) |
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| 54 | { |
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| 55 | char *cmd; |
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| 56 | |
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| 57 | cmd = xasprintf (format: "%s/makedb -o /var/db/passwd.db /var/db/passwd.in" , |
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| 58 | support_bindir_prefix); |
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| 59 | xsystem (cmd); |
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| 60 | free (ptr: cmd); |
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| 61 | |
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| 62 | try_it (); |
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| 63 | try_it (); |
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| 64 | |
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| 65 | return 0; |
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| 66 | } |
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| 67 | #include <support/test-driver.c> |
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| 68 | |
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