mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
d524fa6c35
Linkers group input note sections with the same name into one output note section with the same name. One output note section is placed in one PT_NOTE segment. Since new linkers merge input .note.gnu.property sections into one output .note.gnu.property section, there is only one NT_GNU_PROPERTY_TYPE_0 note in one PT_NOTE segment with new linkers. Since older linkers treat input .note.gnu.property section as a generic note section and just concatenate all input .note.gnu.property sections into one output .note.gnu.property section without merging them, we may see multiple NT_GNU_PROPERTY_TYPE_0 notes in one PT_NOTE segment with older linkers. When an older linker is used to created the program on CET-enabled OS, the linker output has a single .note.gnu.property section with multiple NT_GNU_PROPERTY_TYPE_0 notes, some of which have IBT and SHSTK enable bits set even if the program isn't CET enabled. Such programs will crash on CET-enabled machines. This patch updates the note parser: 1. Skip note parsing if a NT_GNU_PROPERTY_TYPE_0 note has been processed. 2. Check multiple NT_GNU_PROPERTY_TYPE_0 notes. [BZ #23509] * sysdeps/x86/dl-prop.h (_dl_process_cet_property_note): Skip note parsing if a NT_GNU_PROPERTY_TYPE_0 note has been processed. Update the l_cet field when processing NT_GNU_PROPERTY_TYPE_0 note. Check multiple NT_GNU_PROPERTY_TYPE_0 notes. * sysdeps/x86/link_map.h (l_cet): Expand to 3 bits, Add lc_unknown.
28 lines
1.2 KiB
C
28 lines
1.2 KiB
C
/* Additional fields in struct link_map. Linux/x86 version.
|
|
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/>. */
|
|
|
|
/* If this object is enabled with CET. */
|
|
enum
|
|
{
|
|
lc_unknown = 0, /* Unknown CET status. */
|
|
lc_none = 1 << 0, /* Not enabled with CET. */
|
|
lc_ibt = 1 << 1, /* Enabled with IBT. */
|
|
lc_shstk = 1 << 2, /* Enabled with STSHK. */
|
|
lc_ibt_and_shstk = lc_ibt | lc_shstk /* Enabled with both. */
|
|
} l_cet:3;
|