glibc/elf/tst-big-note-lib.S

/* Bug 20419: test for stack overflow in elf/dl-load.c open_verify()
   Copyright (C) 2018 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
   <http://www.gnu.org/licenses/>.  */

/* This creates a .so with 8MiB PT_NOTE segment.
   On a typical Linux system with 8MiB "ulimit -s", that was enough
   to trigger stack overflow in open_verify.  */

.pushsection .note.big,"a"
.balign 4
.fill 8*1024*1024, 1, 0
.popsection
Fix BZ 20419. A PT_NOTE in a binary could be arbitratily large, so using alloca for it may cause stack overflow. If the note is larger than __MAX_ALLOCA_CUTOFF, use dynamically allocated memory to read it in. 2018-05-05 Paul Pluzhnikov <ppluzhnikov@google.com> [BZ #20419] * elf/dl-load.c (open_verify): Fix stack overflow. * elf/Makefile (tst-big-note): New test. * elf/tst-big-note-lib.S: New. * elf/tst-big-note.c: New. 2018-05-06 01:08:27 +00:00			`/* Bug 20419: test for stack overflow in elf/dl-load.c open_verify()`
			`Copyright (C) 2018 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`
			`<http://www.gnu.org/licenses/>. */`

			`/* This creates a .so with 8MiB PT_NOTE segment.`
			`On a typical Linux system with 8MiB "ulimit -s", that was enough`
			`to trigger stack overflow in open_verify. */`

			`.pushsection .note.big,"a"`
			`.balign 4`
			`.fill 810241024, 1, 0`
			`.popsection`