syslog: Fix integer overflow in __vsyslog_internal (CVE-2023-6780)

[glibc.git] / hurd / hurdrlimit.c

/* Resource limits.
   Copyright (C) 1994-2024 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU 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 2.1 of the License, or (at your option) any later version.

   The GNU 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 GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <hurd.h>
#include <lock-intern.h>
#include <hurd/resource.h>
#include "set-hooks.h"

/* This must be given an initializer, or the a.out linking rules will
   not include the entire file when this symbol is referenced. */
struct rlimit _hurd_rlimits[RLIM_NLIMITS] = { { 0, }, };

/* This must be initialized data for the same reason as above, but this is
   intentionally initialized to a bogus value to emphasize the point that
   mutex_init is still required below just in case of unexec.  */
struct mutex _hurd_rlimit_lock = { SPIN_LOCK_INITIALIZER, };

static void attribute_used_retain
init_rlimit (void)
{
  int i;

  __mutex_init (&_hurd_rlimit_lock);

  for (i = 0; i < RLIM_NLIMITS; ++i)
    {
      if (_hurd_rlimits[i].rlim_max == 0)
	_hurd_rlimits[i].rlim_max = RLIM_INFINITY;
      if (_hurd_rlimits[i].rlim_cur == 0)
#define I(lim, val) case RLIMIT_##lim: _hurd_rlimits[i].rlim_cur = (val); break
	switch (i)
	  {
	    I (NOFILE, 1024);	/* Linux 2.2.12 uses this initial value.  */

	  default:
	    _hurd_rlimits[i].rlim_cur = _hurd_rlimits[i].rlim_max;
	    break;
	  }
#undef	I
    }
}
SET_RELHOOK (_hurd_preinit_hook, init_rlimit);