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package/gcc: transition PowerPC 32 to secureplt

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PowerPC has two PLT models: BSS-PLT and Secure-PLT. BSS-PLT uses
runtime code generation to generate the PLT stubs. Secure-PLT was
introduced with GCC 4.1 and Binutils 2.17 (base has GCC 4.2.1 and
Binutils 2.17), and is a more secure PLT format, using a read-only
linkage table, with the dynamic linker populating a non-executable
index table.

References to other distro/BSD transitions:
  https://patchwork.openembedded.org/patch/106621/
  https://reviews.freebsd.org/D20598

Fixes a bug observed when creating SELinux policy where all apps
require execmem because the heap requires execute before this change.

Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f9b539bf40)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Matt Weber 2020-09-23 10:29:08 -05:00 committed by Peter Korsgaard
parent 063c282383
commit 85b5f2c6ff
1 changed files with 7 additions and 0 deletions
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7
package/gcc/gcc.mk
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@ -220,6 +220,13 @@ HOST_GCC_COMMON_CONF_OPTS += \
--with-long-double-128
endif
# Set default to Secure-PLT to prevent run-time
# generation of PLT stubs (supports RELRO and
# SELinux non-exemem capabilities)
ifeq ($(BR2_powerpc),y)
HOST_GCC_COMMON_CONF_OPTS += --enable-secureplt
endif
# PowerPC64 big endian by default uses the elfv1 ABI, and PowerPC 64
# little endian by default uses the elfv2 ABI. However, musl has
# decided to use the elfv2 ABI for both, so we force the elfv2 ABI for