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c65b752604
box with gcc4 and -O6... Fix a bunch of C99 dereferencing type-punned pointer will break strict-aliasing rules errors. Also added prs_int32 (not uint32...) as it's needed in one place. Find places where prs_uint32 was being used to marshall/unmarshall a time_t (a big no no on 64-bits). More warning fixes to come. Thanks to Volker for nudging me to compile like this. Jeremy.
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/*
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Unix SMB/CIFS implementation.
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Samba utility functions
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Copyright (C) Martin Pool 2003
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Copyright (C) Andrew Bartlett 2003
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#ifdef DEVELOPER
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const char *global_clobber_region_function;
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unsigned int global_clobber_region_line;
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#endif
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/**
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* In developer builds, clobber a region of memory.
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*
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* If we think a string buffer is longer than it really is, this ought
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* to make the failure obvious, by segfaulting (if in the heap) or by
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* killing the return address (on the stack), or by trapping under a
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* memory debugger.
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*
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* This is meant to catch possible string overflows, even if the
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* actual string copied is not big enough to cause an overflow.
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*
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* In addition, under Valgrind the buffer is marked as uninitialized.
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**/
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void clobber_region(const char *fn, unsigned int line, char *dest, size_t len)
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{
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#ifdef DEVELOPER
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global_clobber_region_function = fn;
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global_clobber_region_line = line;
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/* F1 is odd and 0xf1f1f1f1 shouldn't be a valid pointer */
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memset(dest, 0xF1, len);
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#ifdef VALGRIND
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/* Even though we just wrote to this, from the application's
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* point of view it is not initialized.
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*
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* (This is not redundant with the clobbering above. The
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* marking might not actually take effect if we're not running
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* under valgrind.) */
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// VALGRIND_MAKE_WRITABLE(dest, len);
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#endif /* VALGRIND */
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#endif /* DEVELOPER */
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}
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