linux-kernel - [PATCH AUTOSEL for-4.9 53/53] MIPS: Use Makefile.postlink to insert relocations into vmlinux

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 8 Nov 2017 20:50:07 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Matt Redfearn <matt.redfearn@...tec.com>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
Subject: [PATCH AUTOSEL for-4.9 53/53] MIPS: Use Makefile.postlink to insert
 relocations into vmlinux

From: Matt Redfearn <matt.redfearn@...tec.com>

[ Upstream commit 44079d3509aee89c58f3e4fd929fa53ab2299019 ]

When relocatable support for MIPS was merged, there was no support for
an architecture to add a postlink step for vmlinux. This meant that only
invoking a target within the boot directory, such as uImage, caused the
relocations to be inserted into vmlinux. Building just the vmlinux
target would result in a relocatable kernel with no relocation
information present.

Commit fbe6e37dab97 ("kbuild: add arch specific post-link Makefile")
recified this situation, so MIPS can now define a postlink step to add
relocation information into vmlinux, and remove the additional steps
tacked onto boot targets.

Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com>
Tested-by: Steven J. Hill <steven.hill@...ium.com>
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14554/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 arch/mips/Makefile          | 12 ------------
 arch/mips/Makefile.postlink | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 12 deletions(-)
 create mode 100644 arch/mips/Makefile.postlink

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 1a6bac7b076f..fb7664c31259 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -327,10 +327,6 @@ rom.bin rom.sw: vmlinux
 		$(bootvars-y) $@
 endif
 
-CMD_RELOCS = arch/mips/boot/tools/relocs
-quiet_cmd_relocs = RELOCS  $<
-      cmd_relocs = $(CMD_RELOCS) $<
-
 #
 # Some machines like the Indy need 32-bit ELF binaries for booting purposes.
 # Other need ECOFF, so we build a 32-bit ELF binary for them which we then
@@ -339,11 +335,6 @@ quiet_cmd_relocs = RELOCS  $<
 quiet_cmd_32 = OBJCOPY $@
 	cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
 vmlinux.32: vmlinux
-ifeq ($(CONFIG_RELOCATABLE)$(CONFIG_64BIT),yy)
-# Currently, objcopy fails to handle the relocations in the elf64
-# So the relocs tool must be run here to remove them first
-	$(call cmd,relocs)
-endif
 	$(call cmd,32)
 
 #
@@ -359,9 +350,6 @@ all:	$(all-y)
 
 # boot
 $(boot-y): $(vmlinux-32) FORCE
-ifeq ($(CONFIG_RELOCATABLE)$(CONFIG_32BIT),yy)
-	$(call cmd,relocs)
-endif
 	$(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) \
 		$(bootvars-y) arch/mips/boot/$@
 
diff --git a/arch/mips/Makefile.postlink b/arch/mips/Makefile.postlink
new file mode 100644
index 000000000000..b0ddf0701a31
--- /dev/null
+++ b/arch/mips/Makefile.postlink
@@ -0,0 +1,35 @@
+# ===========================================================================
+# Post-link MIPS pass
+# ===========================================================================
+#
+# 1. Insert relocations into vmlinux
+
+PHONY := __archpost
+__archpost:
+
+include include/config/auto.conf
+include scripts/Kbuild.include
+
+CMD_RELOCS = arch/mips/boot/tools/relocs
+quiet_cmd_relocs = RELOCS $@
+      cmd_relocs = $(CMD_RELOCS) $@
+
+# `@...e` prevents complaint when there is nothing to be done
+
+vmlinux: FORCE
+	@true
+ifeq ($(CONFIG_RELOCATABLE),y)
+	$(call if_changed,relocs)
+endif
+
+%.ko: FORCE
+	@true
+
+clean:
+	@true
+
+PHONY += FORCE clean
+
+FORCE:
+
+.PHONY: $(PHONY)
-- 
2.11.0