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Bug#1100634: linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel

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  Bug#1100634: linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel Hastalavista_debian <hastalavista_debian@murena.io> - 2025-03-16 14:30 +0100
    Bug#1100634: linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel Emanuele Rocca <ema@debian.org> - 2025-03-17 16:00 +0100
      Bug#1100634: linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel Bastian Blank <waldi@debian.org> - 2025-03-19 20:10 +0100
        Bug#1100634: linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel Emanuele Rocca <ema@debian.org> - 2025-03-20 10:50 +0100
    Bug#1100634: linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel Bastian Blank <waldi@debian.org> - 2025-03-19 20:10 +0100
    Bug#1100634: marked as done (linux: Please enable CONFIG_KALLSYMS_ALL  for arm64 kernel) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-04-12 17:40 +0200

#86458 — Bug#1100634: linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel

Source: linux
Version: 6.1.129-1
Severity: wishlist
X-Debbugs-Cc: hastalavista_debian@murena.io

Dear Maintainer,

I wish to use LKRG (https://lkrg.org) on my RPi, but it reported error "LKRG
requires
CONFIG_KALLSYMS_ALL" when building, which is strange to me because I have never
run
into such problems on amd64 laptops. I checked config file of arm64 kernel
6.1.129 and indeed it didn't have CONFIG_KALLSYMS_ALL enabled.

I wish Debian can have CONFIG_KALLSYMS_ALL enabled by default, so that security
tools like LKRG can run.


-- System Information:
Debian Release: 12.10
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-31-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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#86481

Hi,

On 2025-03-16 01:20, Hastalavista_debian wrote:
> I wish to use LKRG (https://lkrg.org) on my RPi, but it reported error "LKRG
> requires
> CONFIG_KALLSYMS_ALL" when building, which is strange to me because I have never
> run
> into such problems on amd64 laptops. I checked config file of arm64 kernel
> 6.1.129 and indeed it didn't have CONFIG_KALLSYMS_ALL enabled.
> 
> I wish Debian can have CONFIG_KALLSYMS_ALL enabled by default, so that security
> tools like LKRG can run.

Makes sense. Also noteworthy, CONFIG_KALLSYMS_ALL is enabled on arm64 on
at least Fedora/RHEL/SuSE too.

MR opened: https://salsa.debian.org/kernel-team/linux/-/merge_requests/1419

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#86509

On Mon, Mar 17, 2025 at 03:47:11PM +0100, Emanuele Rocca wrote:
> Makes sense. Also noteworthy, CONFIG_KALLSYMS_ALL is enabled on arm64 on
> at least Fedora/RHEL/SuSE too.

Please provide a justification.

Bastian

-- 
There are some things worth dying for.
		-- Kirk, "Errand of Mercy", stardate 3201.7

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#86516

On 2025-03-19 08:01, Bastian Blank wrote:
> On Mon, Mar 17, 2025 at 03:47:11PM +0100, Emanuele Rocca wrote:
> > Makes sense. Also noteworthy, CONFIG_KALLSYMS_ALL is enabled on arm64 on
> > at least Fedora/RHEL/SuSE too.
> 
> Please provide a justification.

- Needed for perf/kprobes/debug output
- It's on by default on both x86 and arm64 upstream
- The Debian kernel team enabled it already on amd64, no reason to unset
  it on arm64

Additionally, not a justification per se but a useful data point, all
other distros I checked have it on.

https://lore.kernel.org/all/164167904946.16921.8215342846945528313.tip-bot2@tip-bot2/
https://github.com/torvalds/linux/blob/master/arch/x86/configs/x86_64_defconfig#L28
https://github.com/torvalds/linux/blob/master/arch/arm64/configs/defconfig#L31
https://salsa.debian.org/kernel-team/linux/-/blob/debian/latest/debian/config/amd64/config?ref_type=heads#L343

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#86508

On Sun, Mar 16, 2025 at 01:20:28PM +0000, Hastalavista_debian wrote:
> I wish to use LKRG (https://lkrg.org) on my RPi, but it reported error "LKRG
> requires
> CONFIG_KALLSYMS_ALL" when building, which is strange to me because I have never
> run
> into such problems on amd64 laptops. I checked config file of arm64 kernel
> 6.1.129 and indeed it didn't have CONFIG_KALLSYMS_ALL enabled.
> 
> I wish Debian can have CONFIG_KALLSYMS_ALL enabled by default, so that security
> tools like LKRG can run.

I don't believe this is a good enough reason to enable this heavy
setting.  The settings tells:

| Say N unless you really need all symbols, or kernel live patching.

We ship a complete set of symbols in our debug package and this is
enough for any debugging workflow.

Requiring this set to be compiled into the kernel itself is a sign of
tampering with the kernel itself.

Bastian

-- 
I object to intellect without discipline;  I object to power without
constructive purpose.
		-- Spock, "The Squire of Gothos", stardate 2124.5

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#86848 — Bug#1100634: marked as done (linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel)

[Multipart message — attachments visible in raw view] — view raw

Your message dated Sat, 12 Apr 2025 15:32:45 +0000
with message-id <E1u3cqb-00Ay39-D5@fasolo.debian.org>
and subject line Bug#1100634: fixed in linux 6.13.11-1~exp1
has caused the Debian Bug report #1100634,
regarding linux: Please enable CONFIG_KALLSYMS_ALL for arm64 kernel
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
1100634: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1100634
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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