hurricos/openwrt-mirror
1
0
Fork 0
mirror of git://git.openwrt.org/openwrt/openwrt.git synced 2025-12-06 12:44:00 -05:00
Code Issues Projects Releases Wiki Activity

build: Add support for linking with DT_RELR

Browse Source 
This adds the -Wl,-z,pack-relative-relocs linking options.
This reduces the size of some binaries.

This is only supported on i386, x86_64, aarch64 and loongarch64 in
binutils. This feature is not support for MIPS.

musl libc supports it since version 1.2.4 .
glibc supports it since vesion 2.36.
binutils ld supports it since version 2.38 for x86 and since version
2.43 for LoongArch.

This reduces the size of the armsr default root file system from
5,262,198 bytes to 5,200,950 bytes by 61,248 bytes.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Hauke Mehrtens 2025-11-06 23:08:04 +01:00
parent 97256a28fe
commit 916e5e1528
2 changed files with 17 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
config/Config-build.in
View File

@ -383,6 +383,15 @@ menu "Global build settings"
bool "Full"
endchoice
config PKG_DT_RELR
bool "Link with relative relocations (RELR)"
depends on (aarch64 || i386 || loongarch64 || x86_64)
default y
help
Link all applications with -Wl,-z,pack-relative-relocs.
This will reduce the size of many applications.
This is only supported on a limited number of architectures.
config TARGET_ROOTFS_SECURITY_LABELS
bool
select KERNEL_SQUASHFS_XATTR

8
include/hardening.mk
View File

@ -8,6 +8,7 @@ PKG_ASLR_PIE_REGULAR ?= 0
PKG_SSP ?= 1
PKG_FORTIFY_SOURCE ?= 1
PKG_RELRO ?= 1
PKG_DT_RELR ?= 1
ifdef CONFIG_PKG_CHECK_FORMAT_SECURITY
ifeq ($(strip $(PKG_CHECK_FORMAT_SECURITY)),1)
@ -69,3 +70,10 @@ ifdef CONFIG_PKG_RELRO_FULL
endif
endif
ifdef CONFIG_PKG_DT_RELR
ifeq ($(strip $(PKG_DT_RELR)),1)
TARGET_CFLAGS += -Wl,-z,pack-relative-relocs
TARGET_LDFLAGS += -zpack-relative-relocs
endif
endif