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[Bug admin/22393] New: Add read-only segment
From: |
hjl.tools at gmail dot com |
Subject: |
[Bug admin/22393] New: Add read-only segment |
Date: |
Fri, 03 Nov 2017 23:19:28 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=22393
Bug ID: 22393
Summary: Add read-only segment
Product: binutils
Version: 2.30 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: admin
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
We currently put read-only sections in read-execute segment:
address@hidden gcc]$ readelf -lW /bin/ls
Elf file type is DYN (Shared object file)
Entry point 0x51c0
There are 9 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
PHDR 0x000040 0x0000000000000040 0x0000000000000040 0x0001f8
0x0001f8 R E 0x8
INTERP 0x000238 0x0000000000000238 0x0000000000000238 0x00001c
0x00001c R 0x1
[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x01d84c
0x01d84c R E 0x200000
LOAD 0x01dfd0 0x000000000021dfd0 0x000000000021dfd0 0x001278
0x002418 RW 0x200000
DYNAMIC 0x01ea18 0x000000000021ea18 0x000000000021ea18 0x0001e0
0x0001e0 RW 0x8
NOTE 0x000254 0x0000000000000254 0x0000000000000254 0x000044
0x000044 R 0x4
GNU_EH_FRAME 0x01a1f4 0x000000000001a1f4 0x000000000001a1f4 0x000824
0x000824 R 0x4
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0x10
GNU_RELRO 0x01dfd0 0x000000000021dfd0 0x000000000021dfd0 0x001030
0x001030 R 0x1
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .interp .note.ABI-tag .note.gnu.build-id .gnu.hash .dynsym .dynstr
.gnu.version .gnu.version_r .rela.dyn .init .plt .plt.got .text .fini .rodata
.eh_frame_hdr .eh_frame
03 .init_array .fini_array .data.rel.ro .dynamic .got .data .bss
04 .dynamic
05 .note.ABI-tag .note.gnu.build-id
06 .eh_frame_hdr
07
08 .init_array .fini_array .data.rel.ro .dynamic .got
address@hidden gcc]$
I'd like to add a read-only segment for read-only sections to prevent
executing data in read-only sections as instructions.
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