linux-kernel - nm vmlinux error in arch/arm reappears after upgrade to make 4.4

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-next>] [day] [month] [year] [list]

Date:   Fri, 6 Jan 2023 17:29:44 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: nm vmlinux error in arch/arm reappears after upgrade to make 4.4

Hi Masahiro,

My distribution recently updated their version of make to 4.4 from 4.3,
after which I notice the following error from nm when building ARCH=arm
kernels, which I thought that this was supposed to be resolved with
commit 3ec8a5b33dea ("kbuild: do not export LDFLAGS_vmlinux") but the
tree clearly has this and it is not visible while just running clean (I
have to build zImage to see it):

  $ git show -s --format='%h ("%s")'
  512dee0c00ad ("Merge tag 'x86-urgent-2023-01-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")

  $ make --version | head -1
  GNU Make 4.4

  $ make -skj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- O=build defconfig zImage
  arm-linux-gnueabi-nm: 'arch/arm/boot/compressed/../../../../vmlinux': No such file

vs.

  $ make --version | head -1
  GNU Make 4.3

  $ make -skj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- O=build defconfig zImage

I bisected make to see what change causes this and I landed on
commit 98da874c ("[SV 10593] Export variables to $(shell ...)
commands") [1], which certainly seems like a reasonable commit to
blame but I am not sure how exactly it factors in here.

If you need any more information on reproducing this, I am happy to
provide it (CROSS_COMPILE is just the toolchains from kernel.org).

[1]: https://git.savannah.gnu.org/cgit/make.git/commit/?id=98da874c43035a490cdca81331724f233a3d0c9a

Cheers,
Nathan