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arm, kbuild: make "make install" not depend on vmlinux

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Install targets (install, zinstall, uinstall) on arm have a dependency
to vmlinux. This may cause parts of the kernel to be rebuilt during
installation. We must avoid this since this may run as root. Install
targets "ABSOLUTELY MUST NOT MODIFY THE SOURCE TREE." as Linus
emphasized this in:

 http://lkml.org/lkml/2013/7/10/600

So on arm and maybe other archs we need the same as for x86:

 1648e4f8 x86, kbuild: make "make install" not depend on vmlinux

This patch fixes this for arm. Dependencies are removed and instead a
check to install.sh is added for the files that are needed.

This issue was uncovered by this build error where the -j option is
used in conjunction with install targets:

 $ make <makeflags>
 $ make <makeflags> zinstall
 ...
   DEPMOD
 Usage: .../scripts/depmod.sh /sbin/depmod <kernelrelease>

(INSTALL_MOD_PATH and INSTALL_PATH variables set, so no root perms
required in this case.)

The problem is that zinstall on arm due to its dependency to vmlinux
does a prepare/prepare3 and finally does a forced rewrite of
kernel.release even if it exists already.

Rebuilding kernel.release removes it first and then recreates it. This
might race with another parallel make job running depmod.

So this patch should fix this one too.

Also quoting $(KERNELRELEASE) arg for install.sh as this messes
argument order in case it is empty (which is the case if the kernel
was not built yet).

Signed-off-by: Robert Richter <robert.richter@linaro.org>
Signed-off-by: Robert Richter <rric@kernel.org>
Acked-by: Michal Marek <mmarek@suse.cz>.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Robert Richter 2013-07-17 18:05:06 +02:00 committed by Michal Marek
parent 272b98c645
commit 19514fc665
3 changed files with 29 additions and 10 deletions
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9
arch/arm/Makefile
View File

@ -296,10 +296,15 @@ archprepare:
# Convert bzImage to zImage
bzImage: zImage
zImage Image xipImage bootpImage uImage: vmlinux
BOOT_TARGETS = zImage Image xipImage bootpImage uImage
INSTALL_TARGETS = zinstall uinstall install
PHONY += bzImage $(BOOT_TARGETS) $(INSTALL_TARGETS)
$(BOOT_TARGETS): vmlinux
$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
zinstall uinstall install: vmlinux
$(INSTALL_TARGETS):
$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@
%.dtb: | scripts

16
arch/arm/boot/Makefile
View File

@ -95,24 +95,24 @@ initrd:
@test "$(INITRD)" != "" || \
(echo You must specify INITRD; exit -1)
install: $(obj)/Image
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
install:
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" \
$(obj)/Image System.map "$(INSTALL_PATH)"
zinstall: $(obj)/zImage
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
zinstall:
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" \
$(obj)/zImage System.map "$(INSTALL_PATH)"
uinstall: $(obj)/uImage
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
uinstall:
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" \
$(obj)/uImage System.map "$(INSTALL_PATH)"
zi:
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" \
$(obj)/zImage System.map "$(INSTALL_PATH)"
i:
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
$(CONFIG_SHELL) $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" \
$(obj)/Image System.map "$(INSTALL_PATH)"
subdir- := bootp compressed dts

14
arch/arm/boot/install.sh
View File

@ -20,6 +20,20 @@
# $4 - default install path (blank if root directory)
#
verify () {
if [ ! -f "$1" ]; then
echo "" 1>&2
echo " *** Missing file: $1" 1>&2
echo ' *** You need to run "make" before "make install".' 1>&2
echo "" 1>&2
exit 1
fi
}
# Make sure the files actually exist
verify "$2"
verify "$3"
# User may have a custom install script
if [ -x ~/bin/${INSTALLKERNEL} ]; then exec ~/bin/${INSTALLKERNEL} "$@"; fi
if [ -x /sbin/${INSTALLKERNEL} ]; then exec /sbin/${INSTALLKERNEL} "$@"; fi