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sortix--sortix/libc/stdlib/clearenv.cpp
Jonas 'Sortie' Termansen a8b8514272 Fix clearenv(3) leaving internal pointer alive after free.
This causes use-after-free and double-free bugs when other environment
functions are subsequently called.
2014-08-23 21:04:39 +02:00

39 lines
1.3 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2014.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
stdlib/clearenv.cpp
Clear the environment and set environ to NULL.
*******************************************************************************/
#include <stdlib.h>
#include <unistd.h>
extern "C" int clearenv()
{
if ( environ == __environ_malloced )
{
for ( size_t i = 0; environ[i]; i++ )
free(environ[i]);
free(environ);
__environ_malloced = NULL;
}
environ = NULL;
return 0;
}