| 1 | /* Copyright (C) 2003-2024 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <setjmp.h> |
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| 19 | #include <signal.h> |
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| 20 | #include <stdio.h> |
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| 21 | #include <stdlib.h> |
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| 22 | #include <sys/types.h> |
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| 23 | |
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| 24 | static sigjmp_buf jmpbuf; |
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| 25 | |
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| 26 | static void |
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| 27 | sig_handler (int signo) |
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| 28 | { |
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| 29 | siglongjmp (jmpbuf, 1); |
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| 30 | } |
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| 31 | |
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| 32 | static int |
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| 33 | do_test (void) |
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| 34 | { |
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| 35 | char *p = NULL; |
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| 36 | /* gcc can overwrite the success written value by scheduling instructions |
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| 37 | around sprintf. It is allowed to do this since according to C99 the first |
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| 38 | argument of sprintf is a character array and NULL is not a valid character |
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| 39 | array. Mark the return value as volatile so that it gets reloaded on |
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| 40 | return. */ |
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| 41 | volatile int ret = 0; |
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| 42 | |
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| 43 | if (signal (SIGSEGV, handler: &sig_handler) == SIG_ERR) |
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| 44 | { |
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| 45 | perror ("installing SIGSEGV handler" ); |
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| 46 | return 1; |
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| 47 | } |
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| 48 | |
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| 49 | puts (s: "Attempting to sprintf to null ptr" ); |
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| 50 | if (setjmp (jmpbuf)) |
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| 51 | { |
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| 52 | puts (s: "Exiting main..." ); |
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| 53 | return ret; |
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| 54 | } |
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| 55 | |
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| 56 | sprintf (p, "This should segv\n" ); |
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| 57 | |
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| 58 | return 1; |
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| 59 | } |
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| 60 | |
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| 61 | #define TEST_FUNCTION do_test () |
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| 62 | #include "../test-skeleton.c" |
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| 63 | |
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